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Cardiac and Vascular Surgery–Associated Acute Kidney Injury: The 20th International Consensus Conference of the ADQI (Acute Disease Quality Initiative) Group

Mitra K. Nadim, Lui G. Forni, Azra Bihorac and 24 more

Journal of the American Heart Association · 2018 · Review

doi:10.1161/jaha.118.008834

Abstract

A cute kidney injury (AKI) occurs in 7% to 18% of hospitalized patients and complicates the course of 50% to 60% of those admitted to the intensive care unit, carrying both significant mortality and morbidity.1 Even though many cases of AKI are reversible within days to weeks of occurrence, data from multiple large observational and epidemiological studies over the past decade suggest a strong association between AKI and subsequent chronic kidney disease (CKD) and end-stage renal disease (ESRD).2,3 Patients with AKI who receive renal replacement therapy (RRT) are >3 times more likely to develop ESRD than those who do not.This rise in the number of patients who receive treatment for ESRD is a global phenomenon associated with considerable patient costs, effects on quality of life, and economic impact on society as a whole.In developing countries, most people with kidney failure have insufficient access to dialysis and/or kidney transplantation.Consequently, the development of effective approaches to the prevention, early recognition, and management of AKI is necessary to reduce the burden of CKD and ESRD. 4 Millions of patients undergo cardiac and vascular surgery (CVS) every year in developed countries alone.AKI is a

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From PubMed Central, U.S. National Library of Medicine, as current on Oct 19, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

1Acute kidney injury (AKI) occurs in 7% to 18% of hospitalized patients and complicates the course of 50% to 60% of those admitted to the intensive care unit, carrying both significant mortality and morbidity.1 Even though many cases of AKI are reversible within days to weeks of occurrence, data from multiple large observational and epidemiological studies over the past decade suggest a strong association between AKI and subsequent chronic kidney disease (CKD) and end‐stage renal disease (ESRD).2, 3 Patients with AKI who receive renal replacement therapy (RRT) are >3 times more likely to develop ESRD than those who do not. This rise in the number of patients who receive treatment for ESRD is a global phenomenon associated with considerable patient costs, effects on quality of life, and economic impact on society as a whole. In developing countries, most people with kidney failure have insufficient access to dialysis and/or kidney transplantation. Consequently, the development of effective approaches to the prevention, early recognition, and management of AKI is necessary to reduce the burden of CKD and ESRD.4

2Millions of patients undergo cardiac and vascular surgery (CVS) every year in developed countries alone. AKI is a common perioperative complication for patients undergoing both cardiac surgery5, 6, 7, 8, 9 and vascular surgery,9, 10, 11 occurring in 20% to 70% of cases depending on the type of surgery and the definition of AKI used. In addition, more and more of these patients who receive complex CVS are elderly with multiple comorbidities, which predispose to the development of AKI and potentially hasten progression to ESRD. Mortality rates among cardiovascular patients undergoing RRT are between 40% and 70%, and mortality is associated with both the severity of the initial insult and the number of episodes of AKI occurring during the hospital admission.12, 13

3In recent years, there have been considerable advances in our understanding of CVS‐associated AKI (CVS‐AKI). Nevertheless, despite the high prevalence, there is little consensus about how best to prevent or treat CVS‐AKI. The aim of this consensus process was to review the current literature on CVS‐AKI; to create the basis for its definition; to develop an initial understanding of its pathophysiology; to explore the potential use of biomarkers for its diagnosis; to critique current literature in the fields of prevention and treatment, so as to make recommendations for clinical practice; and to propose a framework for future research.

Methods

4ADQI (Acute Disease Quality Initiative) is an ongoing process that produces evidence‐based recommendations on the diagnosis, prevention, and management of AKI and on various issues concerning acute dialysis and fluid management (http://www.adqi.org). The conference chairs of the 20th ADQI consensus committee (M.K.N., J.A.K., V.G., C.R., and L.G.F.) convened a panel of experts representing the relevant disciplines—cardiac surgery, vascular surgery, cardiology, nephrology, anesthesiology, and critical care—from North America, Europe, and Asia to discuss the issues related to CVS‐AKI (Data S1). The conference took place June 16 to 19, 2017, and the format of the meeting was a 2.5‐day modified Delphi method to achieve consensus, as described previously (Data S1).14

Pathophysiology

5The pathophysiology of CVS‐AKI is complex and poorly understood. Although patients undergoing cardiac and major vascular surgery may experience similar insults to the kidneys, many distinctions exist between these populations. Notable differences are the relative influence of cardiac dysfunction (greater in cardiac surgery) versus warm ischemia–reperfusion injury to the kidneys and increased abdominal pressures (both greater with vascular surgery). Finally, the effect of the cardiopulmonary bypass (CPB) circuit itself in the case of cardiac surgery is notable. Although animal models15, 16 of CPB and cardiac surgery–associated AKI (CS‐AKI) exist, they have not been widely applied to the study of AKI. Furthermore, although clinical studies have been conducted for >40 years, numerous knowledge gaps remain. Observational studies, animal and cell culture work, and mathematical simulations17 are currently available to predict the events likely to occur during cardiac surgery. Hemodynamic disturbances at each level of arterial blood supply dominate the discussion, and inflammatory, immunological, neurohumoral, and mechanical factors are also of significance (Figure 1).

Hemodynamic perturbations

6Perturbations in the renal blood flow may lead to an imbalance of oxygen supply and demand.18, 19 The inner stripe of the outer medullary portion of the kidney may be susceptible to ischemic damage caused by low resting po 2 (10–20 mm Hg).18 During CPB, cardiac output is preserved, but the target blood pressure under such nonpulsatile conditions is unknown, and inadequate renal perfusion may contribute to AKI. However, using a mathematical model,17 the rewarming phase of CPB appeared to represent the period when the renal medulla may be at most risk because of the combination of high oxygen demand and low oxygen supply occurring at this time. Low cardiac output states during and after cardiac surgery are likely to contribute to the ischemic process, although whether low flow, low blood pressure, or oxygen delivery is the main culprit remains elusive.20 Studies of noncardiac surgery patients suggest that maintenance of sufficient mean arterial pressure is the most important hemodynamic parameter to preserve in the perioperative period21, 22; however, these patients are rarely exposed to hypothermia and hemodilution, so it remains unclear whether this finding also applies to cardiac surgery patients.

7The period after CPB may be relevant for the development of reperfusion injury,23 and the precise underlying mechanisms need to be fully understood so that preventive and salvage treatments may be developed to mitigate this process. Remote ischemic preconditioning (RIPC) appeared to show great promise in a study of high‐risk patients24 but has been shown to be ineffective (at least with respect to the effect sizes examined) in lower risk patients.25, 26, 27 Some controversy exists regarding the effects of propofol, which has been hypothesized to attenuate the response to RIPC.26

8The role of venous congestion in the development of AKI is a potential area of pathophysiological significance.28, 29 The role of high central venous pressure in congestive heart failure is well appreciated.30 The incidence of AKI in this population has led investigators to study it in the context of heart surgery, for which the problem is typically in the right heart, and vascular surgery, for which the problem may be increased abdominal compartment pressures. However, the mechanisms involved are unclear, and although “back pressure” on the glomerular apparatus has been postulated, it is unlikely that this process is the sole cause of this observation. It may be that the renal pelvis is able to compensate for a certain amount of increased venous volume before the pressure–flow relationship inside the poorly compliant renal capsule changes, in keeping with the Monro–Kellie doctrine observed in the brain.31 Whether this truly applies to the kidney is currently a matter of speculation but one that merits further study.

Inflammation and immunity

9The systemic inflammatory response is often observed following major surgery, with considerable variability observed between individuals, although it is recognized that a more severe response is associated with an increased risk of adverse outcomes including AKI.32, 33, 34 Unsurprisingly, CVS is often associated with such a response and may activate the inflammatory cascade through several pathways.35, 36 CVS exposes the patient to a risk profile somewhat different from most other major surgeries. CPB, cross‐clamping of the aorta, high doses of exogenous vasopressors, and high rates of exogenous blood product transfusion, for example, all enhance the risks of AKI, especially when coupled with the risk profile for AKI for most of these patients. Such exposures are associated with perturbations in renal perfusion that induce reperfusion injury following episodes of ischemia, resulting in increased oxidative stress and associated inflammation.37, 38 This process is exacerbated by the significant shunting within the kidney that results in the renal medulla and corticomedullary junction being relatively hypoxic relative to other tissues.18 In cardiac surgery, the entire cardiac output is exposed to an extracorporeal circuit, and this provides a further inflammatory insult through contact activation from the exposure of blood to the CPB circuit; although in the modern CPB circuit biocompatibility has been optimized, measures of immune activation (cytokine and chemokine levels) increase significantly after CPB.36 The generation of reactive oxygen species induces inflammation by upregulation of proinflammatory transcription factors, including NFκ‐B (nuclear factor κ‐B).39, 40 Cytokines and chemokines recruit neutrophils, macrophages, and lymphocytes into the renal parenchyma. Parenchymal infiltration and activation of these immune cells promote AKI and lead to fibrosis. Avoidance of the CPB machine in an attempt to reduce distant organ function has been successful,41 although recently published data suggest that 5‐year survival is lower with off‐pump techniques42; this may be a reflection of improved revascularization of the heart with the on‐pump technique. In the presence of concurrent sepsis, such as with bacterial endocarditis, sepsis and surgery appear to be synergistic in terms of affecting an immune response.43

Iron metabolism and free hemoglobin

10CVS leads to free hemoglobin liberation with the release of free iron, and this phenomenon has generated much interest regarding CS‐AKI.44, 45, 46, 47 A degree of hemolysis is inevitable whenever red blood cells come into contact with an artificial surface or with air (eg, blood scavenging systems), and this may be coupled with a prolonged period of hypothermia (sometimes as low as 18°C), which creates the perfect environment for hemolysis and liberation of free iron, leading to vasoconstriction through scavenging of nitric oxide by free hemoglobin. Indeed, evidence from a case–control study of patients who developed AKI postoperatively compared with matched controls demonstrated that plasma‐free hemoglobin was less than half that observed in the control group, providing further evidence that hemolysis and free iron may contribute to AKI development.44 Moreover, free hemoglobin and, particularly, free ferrous iron increase production of reactive oxygen species via the Fenton and Haber Weis reactions, especially as free hemoglobin and iron are sequestered within the kidney.48 Plasma‐free hemoglobin also induces HO‐1 (heme oxygenase 1) expression. HO‐1 degrades heme but increases in experimental models of AKI. Plasma HO‐1 is increased in patients who develop AKI, and CPB duration, hemolysis, and inflammation are associated with increased HO‐1 concentrations following cardiac surgery.45

Other mechanisms

11Oxygen free radical generation and metabolism is an area of active investigation49, 50 (and genetic predisposition to injury is important51, 52), but it is not clear whether this results in increased susceptibility to AKI or to innate impairment of the ability to repair and regenerate healthy renal tissue. The precise nature of the genetic (and epigenetic) variables involved also remains unclear. Furthermore, embolic disease is important for CS‐AKI. Cholesterol emboli53 are at risk for distal migration when a cross‐clamp is applied or released from the aorta, especially in patients with significant atherosclerosis. Moreover, intra‐aortic balloon counterpulsation devices increase the embolic load, and the fact that these devices are typically deployed in patients with severely compromised hemodynamic conditions makes it difficult to discern whether such devices are of overall benefit (by improving cardiac output) or harm (by increasing generation of emboli) to the kidney. In addition, tissue injury releases mitochondrial damage–associated molecular patterns including mitochondrial DNA, which can act as a direct activator of neutrophils, which in turn elicit a systemic inflammatory response syndrome while suppressing polymorphonuclear function. Such molecular patterns have also been seen during CPB and, as such, may participate in the pathogenesis of CVS‐AKI.54

Perioperative stratification for AKI

12Recommendation:

13We recommend routine implementation of validated clinical risk‐prediction models in the preoperative assessment of all patients undergoing CVS, using estimated glomerular filtration rate (eGFR), cystatin C, and/or albuminuria to improve risk stratification of those at intermediate and high risk of AKI postoperatively (not graded).

14We recommend routine implementation of validated clinical risk‐prediction models in the preoperative assessment of all patients undergoing CVS, using estimated glomerular filtration rate (eGFR), cystatin C, and/or albuminuria to improve risk stratification of those at intermediate and high risk of AKI postoperatively (not graded).

15Rationale: Risk assessment is a dynamic process in which patients with fixed preoperative risk derived from underlying comorbidities are evaluated on the basis of additional and potentially modifiable risks from their clinical status before surgery. The use of currently available risk‐prediction instruments must be guided by the goals of risk assessment in each instance. Preoperative risk assessment may be useful for communicating risks associated with surgery to the patient and in implementing preventive strategies in the intra‐ and postoperative periods, for example, goal‐directed hemodynamic management, individualized blood pressure management,21 and avoidance of the use of NSAIDs for pain management. Postoperative risk assessment is geared toward early identification of AKI that may allow earlier implementation of preventive strategies. Peri‐ and postoperative risk assessment is geared toward early identification of AKI that may allow proactive treatment. An important conceptual point is that kidney injury in the setting of CVS occurs along a continuum and may relate to patient, preoperative, and intraoperative factors and the trajectory of AKI occurrence from baseline conditions; its development over a patient's clinical course should take this aspect into account (Figure 2).

16Although many risk‐prediction scores for AKI after cardiac surgery have been published, only 8 have been externally validated with C statistics ranging from 0.72 to 0.89 (Table S1).55, 56, 57, 58, 59, 60, 61 In general, these scoring systems have good discrimination in assessing low‐risk groups but relatively poor discrimination in moderate to high‐risk patients.62 There are no externally validated risk‐assessment tools specifically for AKI following vascular surgery; although Kheterpal and colleagues developed and externally validated an AKI risk score for general surgery cases that included but was not limited to vascular surgery.63, 64 The most robust cardiac surgery prediction tools with the best discrimination have used AKI requiring RRT as an outcome. This is problematic because AKI requiring dialysis, although catastrophic in this context, is relatively uncommon, occurring in 1% to 2% of all patients undergoing surgery in most programs. In addition, the decision to initiate RRT varies among clinicians. Less severe forms of AKI are commonly seen after cardiac surgery with reported rates of Kidney Disease Improving Global Outcomes (KDIGO) stage 1 AKI reported between 20% and 70% depending on the patient risk factors and the inclusion of KDIGO serum creatinine (sCr) and/or urine output (UO) criteria for AKI.7, 8, 65, 66, 67, 68 Three of the prediction rules have assessed risk of less severe forms of AKI defined using sCr criteria only.56, 58, 69 Of these, one used the RIFLE criteria of AKI,56 and another used the Acute Kidney Injury Network criteria.69

17The risk factors commonly identified in externally validated risk‐prediction models are shown in Figure 2. Preexisting CKD, although variably defined, is the strongest risk factor for AKI in this setting. With 2 exceptions,59, 70 most other prediction tools have used sCr to assess kidney function, which may significantly overestimate kidney function, particularly in malnourished elderly populations. The eGFR, which accounts for age, race, and sex and is subject to similar limitations, is likely a more accurate estimation of kidney function in stable, elective patients. The use of both eGFR and sCr in this context assumes steady‐state kidney function, which is frequently not the case. Newly identified risk factors such as preoperative hemoglobin (anemia/transfusion load) and proteinuria have only been incorporated in recent models, whereas other risk factors have not been rigorously studied for their incremental value when added to existing risk‐prediction models (eg, days from cardiac catheterization to surgery). All risk‐prediction tools have shown only moderate calibration, suggesting significant heterogeneity in the underlying populations.62 Because most risk‐prediction tools have been derived from clinical and administrative databases, they fail to capture acuity of illness, which may account for the calibration discrepancies and the difficulty in discrimination among the moderate‐ to high‐risk groups. Some measure or surrogate for hemodynamic stability is present in all published models whether it is characterized by surgical urgency or the presence of cardiogenic shock. It is likely that risk discrimination would improve if additional objectively defined clinical variables were included.

18At a minimum, all patients undergoing cardiac and vascular surgical procedures should undergo routine clinical assessment of AKI risk. This involves systematic evaluation of known susceptibilities for development of AKI such as CKD and albuminuria using preoperative sCr and urinalysis in all patients before surgery.71, 72, 73 These results will help frame individualized risk for AKI while perhaps providing insight into patients’ baseline renal function. Whenever possible, efforts should be made to obtain the patient's prior kidney‐function tests to ascertain true baseline function. In summary, the currently available preoperative risk‐assessment tools are beneficial in that they use commonly available data and identify low‐risk patients in the setting of traditional CVS. Nevertheless, they have several limitations: They are predominantly used to predict RRT.Sensitivity and specificity break down at the extremes of the spectrum.They do not account for preoperative eGFR (primarily rely on sCr alone).

19They are predominantly used to predict RRT.

20Sensitivity and specificity break down at the extremes of the spectrum.

21They do not account for preoperative eGFR (primarily rely on sCr alone).

22Intra‐ and postoperative factors play equally important roles in determining the course and severity of AKI; as such, continued risk assessment throughout the peri‐ and postoperative periods is crucial for patients at risk of AKI.

Definition and diagnosis of AKI

23Recommendations:

24We recommend that AKI should be defined by the KDIGO criteria, including both sCr and UO criteria (not graded).We recommend checking sCr immediately before surgery in all patients and utilizing sCr‐based eGFR to assess renal function in patients with steady state preoperatively so as to ascertain AKI postoperatively (not graded).We recommend repeated clinical reassessment of AKI risk within the first 12 postoperative hours incorporating intra‐ and postoperative variables (not graded).We suggest measuring biomarkers of AKI (eg, TIMP2·IGFBP7 [combination of tissue inhibitor of metalloproteinases 2 and insulin‐like growth factor binding protein 7] or NGAL [neutrophil gelatinase–associated lipocalin]) in patients at high risk of CS‐AKI (grade 2A).

25We recommend that AKI should be defined by the KDIGO criteria, including both sCr and UO criteria (not graded).

26We recommend checking sCr immediately before surgery in all patients and utilizing sCr‐based eGFR to assess renal function in patients with steady state preoperatively so as to ascertain AKI postoperatively (not graded).

27We recommend repeated clinical reassessment of AKI risk within the first 12 postoperative hours incorporating intra‐ and postoperative variables (not graded).

28We suggest measuring biomarkers of AKI (eg, TIMP2·IGFBP7 [combination of tissue inhibitor of metalloproteinases 2 and insulin‐like growth factor binding protein 7] or NGAL [neutrophil gelatinase–associated lipocalin]) in patients at high risk of CS‐AKI (grade 2A).

29Rationale: The current Society of Thoracic Surgeons (STS) database defines AKI by KDIGO sCr‐based stage 3 AKI (sCr ≥3 times baseline or initiation of RRT).74 However, smaller changes in sCr are associated with adverse outcomes following CVS.75, 76, 77, 78 Given the association of stage 1 AKI (sCr 1.5 times baseline or ≥0.3‐mg/dL increase within 48 hours) with adverse outcomes in multiple settings, it is important to recognize stage 1 AKI (based on sCr and/or UO criteria) so that the progression to stage 2 (sCr 2.0 times baseline) or stage 3 AKI and other outcomes can be monitored. In addition, sCr criteria alone may miss ≈30% of patients with AKI, resulting in both misclassification of AKI severity and delay in management. Critically ill patients who meet AKI criteria by both sCr and UO are at higher risk of adverse outcomes including 30‐day mortality and need for RRT in comparison to those who meet a single criterion for AKI.5, 79, 80, 81 The STS database does not distinguish between AKI and acute kidney disease, which is currently defined as the course of the AKI syndrome in those who continue to have renal pathophysiological changes 7 days after the inciting event. Acute kidney disease may last for weeks to months with variable outcomes (full or partial recovery, ESRD).82 Moreover, the timing and trajectory of AKI (<7 days versus 7–30 days) after CVS can provide insight into the cause of kidney dysfunction and may likely have different associations with adverse outcomes.

30We recommend checking sCr in all patients to determine preoperative baseline kidney function. The time frame depends on the presence of acute illness and other factors that may affect kidney health (eg, recent exposure to iodinated contrast in the setting of cardiac catheterization, medications including angiotensin‐converting enzyme inhibitors and angiotensin receptor blockers). In the absence of such factors, it is reasonable to obtain preoperative baseline sCr within 2 weeks of surgery. When sCr is at steady state (eg, stable for 48 hours), it can be used to calculate eGFR using validated estimating equations (eg, Chronic Kidney Disease–Epidemiology Collaboration [CKD‐EPI] or Modification of Diet in Renal Disease [MDRD]) to assess for CKD.83 For urgent or emergent surgical procedures, when sCr is less likely to be in steady state, the preoperative baseline sCr should be obtained within 24 hours of surgery and, ideally, as close as possible to the start of surgery. In these cases, clinical factors that contribute to the urgency of surgery (eg, cardiogenic shock) are likely to affect sCr and kidney function adversely.

Pitfalls of AKI definitions

31Several specific challenges for AKI definitions exist in the context of cardiac surgery. In the setting of CPB, hemodilution frequently results in postoperative sCr below the preoperative baseline. Given the limitations of sCr, certain subpopulations may be particularly prone to overestimation of baseline kidney function, including elderly patients, sarcopenic patients, or those with significant volume overload. Given the importance of underlying CKD as a risk factor for perioperative AKI, this is most relevant for preoperative risk assessment. In these patients, quantitation of kidney function with cystatin C or timed creatinine clearances or eGFR equations (eg, CKD‐EPI or MDRD) may be preferable approaches.83

Beyond sCr

32Despite its ubiquitous use, sCr is an imperfect marker for the early detection of AKI because rises in sCr are delayed following the kidney insult. In patients with normal preoperative renal function, GFR may decrease significantly with only minimal effect on sCr. During cardiac surgery, CPB and intravenous fluid administration may lead to hemodilution of sCr in the perioperative period, delaying the recognition of AKI. These limitations of sCr (and other functional biomarkers of AKI such as UO) have led to a call for the use of tubular damage and stress biomarkers for the recognition and diagnosis of AKI.82 A recent consensus conference provided a framework for the reclassification of AKI along changes in functional (sCr and UO) and damage or stress biomarkers (Figure 3).84 Over the past decade, several biomarkers of AKI have demonstrated the ability to detect kidney injury or stress and have been proposed as tools to improve the evaluation and treatment of patients with AKI.67, 85, 86, 87, 88, 89, 90, 91, 92

33Importantly, damage may occur before reaching the AKI threshold of changes in sCr or UO, reflecting delay in the kinetics of these functional markers or the presence of renal reserve (the compensatory ability of the kidney to increase GFR in the face of increased demand). The best‐studied and most widely available biomarkers in the clinical setting are urinary or plasma NGAL and TIMP2·IGFBP7.67, 85, 86, 87, 88, 89, 90, 91, 92, 93 NGAL has been most successful in pediatric cardiac surgery, whereas TIMP2·IGFBP7 has been used in both adult and pediatric cases. Thus, biomarkers may potentially refine the clinical management of AKI by providing both diagnostic and prognostic information independent of the conventional functional markers of AKI. Recent studies have demonstrated that implementing kidney‐focused care in the setting of postoperative patients with elevated stress biomarkers leads to improved patient outcomes (less AKI, less severe AKI, and decreased length of stay).67, 93 However, we recommend applying the KDIGO bundle only to CVS patients who are at high risk of AKI identified by biomarkers.

Prevention of CVS‐AKI

34Recommendations:

35We recommend that a variety pharmacological and nonpharmacological strategies be used to prevent AKI in patients undergoing CVS (Table 1; grades 1A–2D). We recommend avoiding certain interventions for prevention of AKI that have been shown to be ineffective or to cause harm (Table 1; grades 1A–1B).A number of approaches to prevent AKI lack sufficient evidence for recommendation and are best avoided until such evidence is available (Table 1; not graded).We recommend avoiding hydroxyethyl starch (grade 1A) and suggest judicious use of balanced crystalloid solutions rather than saline or albumin solutions to replace fluid losses (grade 2B).

36We recommend that a variety pharmacological and nonpharmacological strategies be used to prevent AKI in patients undergoing CVS (Table 1; grades 1A–2D).

37We recommend avoiding certain interventions for prevention of AKI that have been shown to be ineffective or to cause harm (Table 1; grades 1A–1B).

38A number of approaches to prevent AKI lack sufficient evidence for recommendation and are best avoided until such evidence is available (Table 1; not graded).

39We recommend avoiding hydroxyethyl starch (grade 1A) and suggest judicious use of balanced crystalloid solutions rather than saline or albumin solutions to replace fluid losses (grade 2B).

40Rationale: The evidence for most pharmacological and nonpharmacological strategies in the perioperative setting is limited because the majority of studies are single center, are of poor quality with small sample sizes, and/or use variable inclusion criteria. In addition, the timing and dose of pharmacological agents and the definition of AKI vary widely.

Perioperative

41Numerous pharmacological agents including levosimendan,94, 95, 96, 97 statins,98, 99, 100 N‐acetylcysteine,101, 102, 103, 104 sodium bicarbonate,105, 106, 107, 108 and erythropoietin109, 110, 111, 112, 113 have, for the most part, failed to demonstrate benefit for the prevention of CS‐AKI. A possible exception is dexmedetomidine, for which a number of small or low‐quality studies found a reduction in the occurrence of AKI after cardiac surgery.114, 115, 116 Moderate glucose control (127–179 mg/dL) was found in a randomized controlled trial (RCT) to be preferable to tight control (≤126 mg/dL) in patients undergoing coronary artery bypass grafting,117 resulting in lower rates of AKI and mortality, with the most important factor being avoidance of glucose variability throughout the entire perioperative time frame.118, 119 The use of balanced crystalloid solutions guided by measures of fluid responsiveness is supported by the current literature and is consistent with the recommendations for fluid management in critically ill patients with sepsis.97, 120, 121, 122, 123 The administration of hydroxyethyl starch is not indicated for patients at risk of CS‐AKI because of its demonstrated renal toxicity.97, 121 Although albumin may have a role preoperatively in patients with hypoalbuminemia,124 we suggest limiting colloid administration in cardiac surgery patients as much as possible and recommend balanced crystalloid solutions as replacement fluid, in keeping with the literature.120

Preoperative

42Although evidence is limited, several studies demonstrate that withholding angiotensin‐converting enzyme inhibitors and angiotensin receptor blockers in the preoperative period is associated with reduced incidence of AKI.125, 126, 127 Correction of hypoalbuminemia (level of <4 g/dL) by exogenous albumin supplementation has been shown to be renoprotective in off‐pump cardiac surgery.124, 128

Intraoperative

43Volatile anesthetics have been shown to protect against AKI in clinical trials.129, 130 A recently published meta‐analysis including 10 trials with 1600 total participants demonstrated that volatile anesthetics significantly reduced AKI incidence compared with control data (relative risk: 0.65; 95% confidence interval, 0.43–0.97; P=0.04). Although there was no significant difference between groups in absolute postoperative sCr level and mortality, patients receiving volatile anesthetics had significantly (or borderline) lower increase in sCr level from baseline on the first and second postoperative days and reduced incidence of prolonged intensive care unit stay and hospitalization.131

Postoperative

44For agents such as dopamine,132 α‐melanocyte–stimulating hormone analog,133 and loop diuretics,134, 135 evidence shows that their use in the prevention of AKI either is not beneficial or is potentially harmful.132, 134, 135 Because the evidence for mannitol136, 137, 138 and fenoldopam139, 140, 141, 142, 143 is either weak or controversial, more research is needed. Although natriuretic peptides have been shown in some studies to reduce the incidence of AKI, the need for RRT was similar, and the overall evidence for these drugs was weak and controversial.144, 145, 146, 147, 148, 149, 150, 151, 152 Vasodilatory shock (vasoplegia) has become a common occurrence, particularly with the widespread use of angiotensin‐converting enzyme inhibitors and angiotensin receptor blockers.153 In a recent RCT of patients with vasoplegic shock (defined as mean arterial pressure <65 mm Hg resistant to fluid challenge and cardiac index >2.2 L/min per m2) after cardiac surgery, vasopressin was associated with lower incidence of severe AKI (stages 2 and 3) and RRT use, although, again, study limitations prevent recommendation and further research is needed.154

Perioperative

45Again, results in this area are contradictory. Intravenous contrast before surgery may increase the incidence of AKI and has led to some recommendations for delaying surgery 24 to 72 hours after contrast administration155, 156; however, another study disagrees.157 Preoperative placement of an intra‐aortic balloon pump may prevent AKI and reduce the incidence of RRT in high‐risk patients by improving perfusion and reducing endothelial activation.158, 159 Others, however, have suggested that using an intra‐aortic balloon pump as a surrogate to achieve pulsatile perfusion contributes significantly to lowered aortic pressure in the distal portion of aorta and may impair kidney perfusion.160

Intraoperative

46The use of CPB is required for the majority of cardiac surgical procedures. During CPB, cardiac output is preserved, but the target blood pressure under such nonpulsatile conditions is unknown. A large RCT demonstrated that maintaining a higher level of mean arterial pressure during normothermic CPB did not reduce the incidence of AKI.161 However, before making any recommendations, further evidence is required. The impact of off‐pump coronary artery bypass (OPCAB) on renal outcomes has been studied extensively and remains another point of controversy. OPCAB exerted a renoprotective effect in patients with normal preoperative sCr but not in patients with preexisting renal disease.162 No impact on the incidence of AKI with the 2 competing strategies was seen in some series,163, 164 whereas others found an association of on‐pump coronary artery bypass with higher incidence of AKI.165 A meta‐analysis of trials (n=17 322 patients) suggests a lower risk for AKI but no difference in the need for RRT in off‐pump surgery patients.166 However, a recently published RCT (n=2932 patients) demonstrated that OPCAB reduced the risk of postoperative AKI in comparison to on‐pump coronary artery bypass grafting, with no discernable difference in kidney function at 1 year.41 Although data suggest a reduction in AKI in OPCAB, a recent RCT42 and several meta‐analyses167, 168 have demonstrated an increase in long‐term, all‐cause mortality in OPCAB compared with on‐pump surgery. Consequently, the greater operative safety and possible prevention of AKI with OPCAB may come at the expense of long‐term survival gains.

47Catheter manipulation in the thoracic and abdominal aorta may lead to renal artery embolization, with aortic cross‐clamping proximal to the renal arteries associated with ischemia–reperfusion injury, further aggravated by atheroemboli secondary to aortic manipulation.169, 170 Aortic clamping above bilateral renal arteries, adjunctive renal artery procedures, and left renal vein division have been found to increase the incidence of AKI.136 Emboli protection devices may help preserve renal function and prevent procedure‐related atheroembolism during endovascular renal interventions.171 Transradial coronary angiography avoids catheter manipulation in the descending and abdominal aorta, which, compounded by reduced bleeding, leads to less AKI than transfemoral angiography.172 Avoidance of aortic manipulation (the “no touch” technique) in OPCAB has been shown to decrease the risk of postoperative stroke in several studies; however, its effect on AKI incidence remains controversial, with some studies demonstrating lower incidence,173, 174 but others failing to do so.175, 176

48Moderate hypothermic circulatory arrest with antegrade cerebral perfusion during complex aortic surgery has been embraced by an increasing number of surgical groups, with data suggesting that this is not associated with an increased AKI risk.177 Conversely, hyperthermic perfusion during CPB, defined as a cumulative time at >37°C, is associated with an increase in AKI incidence.178 In a study achieving clinical equipoise through propensity score matching, duration of hyperthermic perfusion was independently associated with severity of AKI, with a 51% increase in the incidence for every 10 minutes of hyperthermic perfusion.179 Cold renal perfusion has been suggested for pararenal abdominal aorta aneurysm surgery to reduce the incidence of AKI associated with juxtarenal and thoracoabdominal aortic operations.180, 181, 182

49Pulsatile perfusion provides surplus mechanical energy transmission to the vascular endothelium. Its impact on clinical outcomes has been extensively studied in a variety of settings; however, the data on renal outcomes are conflicting because of the lack of uniformity in pulsatility delivery.159, 183, 184, 185 A retrospective analysis showed pulsatile CPB conferred a renoprotective effect in higher risk patients undergoing cardiac surgery.186 However, the contemporary use of implantable continuous‐flow left ventricular assist devices challenges this concept.187 The improvement in the hemodynamic environment provided by continuous‐flow left ventricular assist devices leads to better renal function in heart failure patients, implying that the theoretical importance of pulsatility is superseded by increased cardiac output.187, 188

50Hemodilution during CPB is an independent risk factor for AKI in adult cardiac surgery,189 with improved outcomes for cases in which significant hemodilution (hematocrit <24%) is avoided during CPB.190 Although lower hemoglobin (8.8 versus 13.1 g/dL) preoperatively and on arrival to the intensive care unit has been associated with persistent AKI after cardiac surgery,191 transfusion of at least 2 U of packed red blood cells has also been associated with higher incidence of CVS‐AKI.192 In 2 recent RCTs in which patients were randomized to a liberal (Hg <9.5 g/dL) or restrictive (Hg <7.5 g/dL) transfusion policy intraoperatively and postoperatively, there was no difference in postoperative outcomes including AKI.193, 194 In addition, studies have failed to demonstrate any benefit in the use of erythropoietin in the prevention of postoperative AKI.109, 110, 111 Conventional ultrafiltration has been used to treat the hemodilutional effects of CPB circuits, but routine adoption does not seem to be efficacious, with a recent study demonstrating a higher adjusted risk of AKI.195

51As discussed, the effect of RIPC on renal function yields conflicting results.24, 25, 26 In high‐risk patients undergoing cardiac surgery, the rate of AKI and the need for RRT have been found to be significantly decreased using RIPC,196 whereas in studies of unselected patients with nonstandardized intraoperative technique, no renal benefit was observed.25, 26 Results of recent meta‐analyses have failed to demonstrate the efficacy of RIPC in reducing the incidence of AKI or the need for RRT.197, 198, 199, 200 Importantly, these meta‐analyses included studies involving low‐risk patients and studies that used propofol. In a subgroup of studies in which propofol was not used, a reduction in AKI was demonstrated, suggesting a possible interaction of propofol with the protective effects of RIPC.200 Data for vascular surgery patients are also conflicting and limited to 4 small RCTs in patients undergoing open or endovascular abdominal aortic aneurysm repair, the majority of whom showed no benefit with RIPC in preventing AKI.201, 202, 203, 204

Postoperative

52Implementation of a “KDIGO bundle of care”—consisting of avoidance of nephrotoxic agents, discontinuation of angiotensin‐converting enzyme inhibitors and angiotensin receptor blockers for the first 48 hours after surgery, close monitoring of sCr and UO, avoidance of hyperglycemia for the first 72 hours after surgery, consideration of alternatives to radiocontrast agents, and close hemodynamic monitoring using a prespecified algorithm—prevented CVS‐AKI in high‐risk patients defined as biomarker positive.67, 93 A lower rate of CS‐AKI has been shown in patients ventilated with low (<10 mL/kg) tidal volume compared with traditional (10–12 mL/kg) or high (>12 mL/kg) tidal volumes after cardiac surgery.205

Workup and monitoring

53Recommendations:

54The choice of diagnostic tests and monitoring for patients with CVS‐AKI is determined by the presence and the degree of kidney and/or cardiorespiratory dysfunction (not graded).The diagnostic approach depends on the etiology of organ dysfunction and the expected short‐ and long‐term patient outcomes (not graded).A kidney‐specific and stepwise diagnostic approach for patients with CVS‐AKI and cardiorespiratory dysfunction may be helpful (not graded).

55The choice of diagnostic tests and monitoring for patients with CVS‐AKI is determined by the presence and the degree of kidney and/or cardiorespiratory dysfunction (not graded).

56The diagnostic approach depends on the etiology of organ dysfunction and the expected short‐ and long‐term patient outcomes (not graded).

57A kidney‐specific and stepwise diagnostic approach for patients with CVS‐AKI and cardiorespiratory dysfunction may be helpful (not graded).

58Rationale: Effective interventions to reverse the consequences of AKI remain elusive, with efforts focusing on primary prevention. Nevertheless, management of patients who sustain AKI is of vital importance, both to reduce the immediate impact of AKI and to avoid further episodes of AKI and avert the progression of AKI to acute kidney disease or CKD. Organ functional changes are dynamic, and, as such, frequent assessments are required to establish the trajectory that will influence the nature and urgency of interventions. Such assessments should guide preemptive therapies to prevent or manage complications that are anticipated in the setting of AKI. Because the impact of CVS‐AKI on both short‐ and long‐term outcomes of patients is significant, reaching appropriate diagnoses to provide etiology‐specific individualized preventive and/or therapeutic measures is critical. The diagnostic tests and monitoring strategies available are manifold (Table 2) and should be determined by the level of kidney or cardiorespiratory dysfunction present (Figure 4A and 4B).

59If no evidence shows cardiopulmonary failure, it is essential to try to identify the etiology of the AKI. Following evaluation of cardiorespiratory function and intravascular volume status, urine analysis and medication review are initial steps in assessing such patients. The use of stress or injury biomarkers of AKI may potentially allow more accurate prognostication of AKI because they have been shown to correlate with long‐term outcomes.206, 207 When AKI persists for >48 to 72 hours, nephrology consultation to evaluate other potential causes of AKI and, potentially, disease‐specific management may be helpful. For patients who require RRT, close monitoring of metabolic milieu and hemodynamic/volume status is critical. Once discharged, clinicians should follow patients who recovered from CVS‐AKI for the development of CKD or other post‐AKI complications.2

Pharmacological and nonpharmacological support

60Recommendations:

61The management goals for the CVS patient who has sustained AKI include preventing the progression of AKI, promoting renal recovery precluding subsequent episodes of AKI, and treating the acute and chronic consequences of AKI (not graded).We recommend not using natriuretic peptide, fenoldopam, diuretics, dopamine, or mannitol for the treatment of CVS‐AKI (grade 1C).The decision to start RRT should be individualized with consideration of the clinical context and not be based solely on renal function or stage of AKI. Once the decision to initiate RRT has been made, it should be started promptly (not graded).We recommend the use of continuous therapies in patients with hemodynamic instability and in situations in which shifts in fluid balance are poorly tolerated (grade 1B).

62The management goals for the CVS patient who has sustained AKI include preventing the progression of AKI, promoting renal recovery precluding subsequent episodes of AKI, and treating the acute and chronic consequences of AKI (not graded).

63We recommend not using natriuretic peptide, fenoldopam, diuretics, dopamine, or mannitol for the treatment of CVS‐AKI (grade 1C).

64The decision to start RRT should be individualized with consideration of the clinical context and not be based solely on renal function or stage of AKI. Once the decision to initiate RRT has been made, it should be started promptly (not graded).

65We recommend the use of continuous therapies in patients with hemodynamic instability and in situations in which shifts in fluid balance are poorly tolerated (grade 1B).

66Rationale: For those patients with CVS‐AKI who present with cardiorespiratory failure, the diagnostic approach needs to focus first on addressing cardiorespiratory dysfunction. Among patients who have significant baseline or acute cardiorespiratory failure or who require substantial support for heart and lung function, the intensity of hemodynamic and intravascular volume status monitoring should be escalated.208 The hemodynamic management of cardiac surgery patients with renal dysfunction should focus on: Improvement of right and left ventricular functionMaintenance of MAP and sinus rhythmOptimization of preloadManagement of right ventricle afterload (pulmonary vascular resistance)Optimization of mechanical ventilation

67Improvement of right and left ventricular function

68Maintenance of MAP and sinus rhythm

69Optimization of preload

70Management of right ventricle afterload (pulmonary vascular resistance)

71Optimization of mechanical ventilation

Pharmacological cardiac support

72A multipharmacological approach is frequently necessary. Catecholamines are often required to improve ventricular function, acting through a direct inotropic effect but also by improving myocardial perfusion and recruitment of unstressed venous preload. Phosphodiesterase type III inhibitors (milrinone and enoximone), calcium sensitizers (levosimendan), and pulmonary vasodilators (inhaled nitric oxide, inhaled prostacyclin, and inhaled milrinone) can improve cardiac performance while reducing afterload on both right and left ventricles. Because the determinant for renal perfusion is the arterial and venous blood pressure, both left ventricle dysfunction and increased central venous pressure are associated with decreased renal perfusion and increased renal afterload contributing to CS‐AKI.209 As noted, increased renal venous pressure also causes an increase in the renal subcapsular pressure, thereby reducing glomerular filtration.210 The use of dynamic measures based on heart–lung interactions to predict fluid responsiveness, such as pulse pressure or stroke volume variation, has been shown to improve outcomes including renal function in both cardiac and noncardiac settings.211 Fluid overload is particularly problematic following cardiac surgery because of the frequent co‐occurrence of low cardiac output and postcardiotomy ventricular impaired relaxation. Following the acute phase, slow and controlled volume unloading, through the use of diuretics and/or continuous RRT, is frequently necessary.

Pharmacological kidney support

73Pharmacological management of CVS‐AKI remains challenging, with no specific approaches available currently. Many drugs including dopamine, loop diuretics, mannitol, and natriuretic peptides have been investigated as primary renal therapy. Although associated with increased UO, none are routinely used because of limited and conflicting data and, in some cases, evidence of harm.140, 145, 212 RCTs with natriuretic peptides have shown inconsistent effects for renal end points. Meta‐analyses demonstrated that atrial natriuretic peptide in high doses was associated with a trend toward increased mortality and more adverse events in patients undergoing cardiac surgery.144 Although there was a reduced need for RRT (with the associated problems using RRT as an end point) with low‐dose atrial natriuretic peptide in patients undergoing CVS, there was no difference in mortality. The majority of studies on atrial natriuretic peptide are underpowered and of low or moderate quality; therefore, atrial natriuretic peptide is not currently recommended for treatment of AKI.213 Although meta‐analyses have suggested a decrease in RRT in patients with CS‐AKI who were treated with fenoldopam, a multicenter, randomized, double‐blind, placebo‐controlled, parallel‐group study of patients with CS‐AKI (n=667) was stopped for futility after an interim analysis. Fenoldopam infusion did not reduce 30‐day mortality or the need for RRT but was associated with an increased rate of hypotension compared with placebo.140

Renal replacement therapy

74In patients undergoing cardiac surgery, perioperative fluid overload has been associated with worse outcomes and is a primary risk factor for multiorgan failure, including AKI.214, 215, 216 Fluid balance can be achieved with pharmacological agents; however, in some cases, RRT should be considered to correct fluid accumulation, even in nonoliguric patients if the daily fluid balance cannot be maintained or is negative with the use of diuretics, to avoid the negative effects of prolonged fluid overload in critically ill patients (Figure 5).217, 218, 219

75The optimal timing of RRT initiation remains a topic of much debate. Theoretically, initiation of RRT before the onset of severe AKI could improve survival and promote earlier recovery of kidney function by mitigating injury from acidemia, uremia, fluid overload, and systemic inflammation.220 However, early initiation may put patients at risk associated with RRT when a conservative approach could be used. Meta‐analyses examining the timing of initiation of RRT221, 222, 223, 224 have suggested that earlier initiation of RRT in critically ill patients with AKI may have a beneficial impact on survival. A few small RCTs were included, as well as numerous observational and cohort studies of various qualities with high heterogeneity. Although AKI stage correlates with hospital mortality, many patients with stage 3 AKI will show spontaneous recovery without RRT. In addition, some patients may have urgent indications for RRT (eg, fluid overload not responding to diuretics) without meeting severe AKI criteria. The decision to start RRT should be individualized.219 Recently, 2 large RCTs in critically ill patients compared “early” versus “late” RRT.225, 226 In the ELAIN (Early vs Late Initiation of Renal Replacement Therapy In Critically Ill Patients With Acute Kidney Injury) trial (n=231), patients with AKI stage 2 and serum NGAL >150 ng/mL were randomized to early (RRT within 8 hours of AKI stage 2) or late (RRT within 12 hours of reaching AKI stage 3) RRT.225 Approximately half of the patients were cardiac surgery patients (47%). Patients in the early RRT group had 25% lower mortality compared with those in the late arm. Only 10% of patients in the late group did not receive RRT. In the AKIKI (Artificial Kidney Initiation in Kidney Injury) trial (n=620), patients were randomized to early treatment, defined as RRT within 6 hours of reaching AKI stage 3, or late treatment, defined as RRT initiation when “absolute” indications were fulfilled.226 Mortality (≈50%) was not significantly different between the 2 groups, but approximately half of the patients randomized to late treatment did not receive RRT. Patients in the late treatment group who started RRT had higher mortality (62%) compared with patients in the early RRT group (48.5%). Forty percent of the patients were excluded on the basis of having emergent indications, already receiving RRT, or having indications for initiation of RRT for >5 hours. Clearly, these 2 trials do not definitively identify which patients are likely to benefit most from early initiation of RRT.

76Studies of dialysis modality (continuous versus intermittent) have failed to demonstrate a consistent benefit of one technique over another.227 However, continuous RRT is recommended for patients with hemodynamic instability that exceeds the ability to manage patients safely with intermittent hemodialysis.213, 219, 228 In addition, fluid removal is generally easier and associated with less hemodynamic instability when using continuous RRT.229, 230 It is possible that the operational characteristics of RRT might influence renal and patient recovery. Several observational studies have suggested that intermittent hemodialysis compared with continuous RRT is associated with less renal recovery and a higher risk of long‐term dialysis dependency.231, 232

Stem cells

77Use of mesenchymal stem cells, which are nonhematopoietic precursor cells derived from human bone marrow, is currently under investigation (2 trials completed and being analyzed) for the treatment of CS‐AKI.233, 234 The role of mesenchymal stem cells in AKI treatment might depend on the secretion of promitotic, antiapoptotic, anti‐inflammatory, and immunomodulatory factors.235

Knowledge Gaps and Future Research

78Currently, there is a paucity of data regarding diagnosis, prevention, and treatment, especially in patients undergoing vascular surgery. Consequently, it is imperative to develop research questions to address these issues (Table 3). For many of the pharmacological agents available for the prevention or management of AKI in this setting, larger RCTs will be needed to determine efficacy in different clinical scenarios. It is important to establish the utility of new biomarkers, not only for the early diagnosis and staging of AKI but also for the implementation of preventive measures.

Sources of Funding

79This conference was supported by educational grants from OneLegacy Foundation, Baxter, NxStage Medical, Astute Medical, Sphingotec, Fresenius, Ortho Clinical Diagnostics, AM‐Pharma and La Jolla Pharmaceutical.

Disclosures

80Nadim has acted as a consultant for Sphingotec and Baxter. Forni has received speakers fees from Astute medical and as a consultant for Ortho Clinical Diagnostics, Baxter and La Jolla Pharmaceuticals. Bihorac has received speakers honoraria from Astute Medical. Koyner has received research funds from Astute Medical, Bioporto, Satellite Health Care, speakers honoraria from the American Society of Nephrology, expert witness on AKI post cardiac surgery, and consultancy work for Sphingotec and Pfizer. Shaw has received consultancy fees from Edwards, Astute Medical, FAST Biomedical and NxStage. Engelman has received consultancy fees from Astute Medical, Astellas. Liu has received consultancy fees from Potrero Medical, Quark and Theravance. Mehta has received consultancy fees from Baxter, Astute Medical, Sphingotec. Pickkers, Radboud University Medical Center, has received consultancy fees from Baxter, Sphingotec and AM Pharma. Zarbock, has received research fees from Astute Fresenius, Astute Medical, Fresenius, Astellas, Baxter and consultancy fees from Sphingotec and Astellas. Kellum, has received research funding from, Astellas Baxter Bioporto Astute Medical, Grifols Cytosorbents Bard, NxStage, and has received consultancy fees from, Astellas, Baxter, Bioporto, Grifols, Astute Medical, NxStage, Cytosorbents, Sphingotec.

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