Skip to main content
  • Research article
  • Open access
  • Published:

Long-term risk of mortality for acute kidney injury in HIV-infected patients: a cohort analysis

Abstract

Background

Acute kidney injury (AKI) is common in hospitalized human immunodeficiency virus (HIV)-infected patients and is associated with hospital mortality. We aimed to evaluate the impact of AKI on long-term mortality of hospitalized HIV-infected patients.

Methods

Retrospective analysis of a cohort of 433 hospitalized HIV-infected patients who were discharged alive from the hospital. AKI was defined according to ‘Risk Injury Failure Loss of kidney function End-stage kidney disease’ creatinine criteria, as an increase of baseline serum creatinine (SCr) X 1.5 or in patients with baseline SCr > 4 mg/dL if there was an acute rise in SCr of at least 0.5 mg/dL. Cumulative mortality curves were determined by the Kaplan-Meier method, and log-rank test was employed to analyze statistically significant differences between curves. Cox regression method was used to determine independent predictors of mortality. Risk factors were assessed with univariate analysis, and variables that were statistically significant (P < 0.05) in the univariate analysis were included in the multivariate analysis.

Results

Sixty-four patients (14.8%) had AKI. Median follow-up was 37 months. At follow-up 81 patients (18.7%) died. At 1, 2 and 5 years of follow-up, the cumulative probability of death of patients with AKI was 21.2, 25 and 31.3%, respectively, as compared with 10, 13.3 and 16.5% in patients without AKI (log-rank, P = 0.011). In multivariate analysis AKI was associated with increased mortality (adjusted HR 1.7, 95% CI 1.1-3; P = 0.049).

Conclusions

AKI was independently associated with long-term mortality of hospitalized HIV-infected patients.

Peer Review reports

Background

Although acute kidney injury (AKI) is a common complication in the hospital and has an immediate impact on morbidity, mortality, and resource utilization [14], its detrimental effect appears to persist also after recovery, since AKI has been associated with an increased long-term mortality risk [57]. Understanding the impact of AKI on long-term outcomes will have a marked impact on treatment and risk stratification during hospitalization and will assist with guiding follow-up care after discharge.

Over the last two decades, the number of individuals infected with human immunodeficiency virus (HIV) has markedly increased, and, actually, > 30 million people are affected with HIV infection worldwide [8]. Since the introduction of the highly active antiretroviral therapy (HAART) at the end of 1995, the annual number of deaths reported with HIV infection decreased dramatically as well as the number of deaths caused by HIV infection or by an acquired immunodeficiency syndrome (AIDS)-defining disease. Conversely, comorbidities such as kidney disease, liver disease, heart disease and non-AIDS-defining cancers have proportionally increased and have become significant contributors to morbidity in HIV-infected patients [911].

Renal disorders in HIV-infected patients can present as an acute or chronic condition, and they are associated with increased morbidity and mortality in this population [1216]. Acute kidney injury (AKI) is a common complication in ambulatory HIV-infected patients treated with HAART and has been associated with prior renal impairment, lower CD4 levels, AIDS, hepatitis C virus coinfection and liver disease [17, 18]. HIV-infected patients are also at increased risk for AKI development within hospitalization, related to volume depletion, sepsis and the acute administration of nephrotoxic medications or radiocontrast. Before the advent of HAART, studies addressing AKI on HIV-infected patients typically included only severe cases of AKI which were identified through hospital records or biopsy databases [1921]. In the HAART era, the reported incidence of AKI in hospitalized HIV-infected patients ranged from 6 to 20%, and AKI was associated with increased in-hospital mortality [22, 23]. In the present study, we evaluated the impact of AKI on long-term mortality in a cohort of hospitalized HIV-infected patients who were discharged alive from the hospital.

Methods

The present study was retrospective, including HIV-infected patients admitted to the Department of Infectious Diseases of the Hospital de Santa Maria (Lisbon, Portugal) between January 2005 and December 2007. Hospital de Santa Maria is a tertiary and teaching hospital providing medical assistance to an area with almost 3000000 inhabitants. Since this was a retrospective and observational study that did not evaluate a specific therapeutic or prophylactic intervention, study approval was waived by the Ethical Committee of our Hospital according to Institutional guidelines.

Selection criteria, population and study periods

During the study period, 547 HIV-infected patients were admitted to the Department of Infectious Diseases of our hospital; 13 of them were chronic kidney disease (CKD) patients on dialysis and were not included in this study. None of the patients had received a renal transplant. From the 534 remaining patients, 45 patients who were hospitalized <24 h and/or had no serum creatinine (SCr) determination within hospitalization and 56 patients who died within the hospitalization were excluded from the analysis. Therefore, in this study, we focused on 433 hospitalized HIV-infected who were alive at hospital discharge (mean age: 41.5 years; 290 Male; 312 Caucasian; 412 infected with HIV-1, 18 with HIV-2 and 3 with both HIV-1 and HIV-2) and analyzed them as a cohort. In 285 patients (65.8%) HIV was diagnosed previously to the hospitalization and in 148 patients (34.2%) HIV was only diagnosed within the hospitalization (86% of them were late presenters). From those patients with previously documented HIV infection, the majority (N = 250, 87.7%) were followed-up by a specialist (70% were receiving HAART) while 12.3% of patients were not followed-up by a specialist.

Definitions

Acute kidney injury (AKI) was defined according to ‘Risk Injury Failure Loss of kidney function End-stage kidney disease’ creatinine criteria [24], as an increase of baseline serum creatinine (SCr) X 1.5. AKI was also considered in patients with baseline SCr > 4 mg/dL in whom there was an acute rise in SCr of at least 0.5 mg/dL (irrespective of the percentual increase in SCr) as these patients are also classified as having AKI (Failure class).The most recent SCr value registered within 1–6 months prior to admission was considered the baseline SCr and was available in 417 patients (96.3%); when it was unavailable (N = 16, 3.7%) baseline SCr was estimated by the Modification of Diet in Renal Disease equation [25], as recommended (assuming a lower limit of the normal baseline glomerular filtration rate (GFR) of 75 mL/min/1.73m2) and previously applied [1, 4, 26]. Complete renal function recovery was considered if the SCr at hospital discharge with reference to baseline SCr was lower than X 1.5, and in patients with baseline SCr >4 mg/dL, complete renal function recovery was also considered if SCr at hospital discharge was also <0.5 mg/dL with reference to baseline SCr. On the other hand, partial renal function recovery was considered if the SCr at hospital discharge with reference to baseline SCr was equal or higher than X 1.5, and in patients with baseline SCr >4 mg/dL, partial renal function recovery was also considered if SCr at hospital discharge was also ≥0.5 mg/dL with reference to baseline SCr; in both cases, there was no dialysis requirement at hospital discharge [15]. HIV infection was staged according to the Centers for Disease Control and Prevention (CDC) classification [27]. Diabetes mellitus was diagnosed according to the World Health Organization criteria [28], and hypertension was diagnosed based on the seventh report of the Joint National Committee (JNC 7) [29]. Cardiovascular disease (CVD) included chronic heart failure, coronary artery disease, cerebrovascular disease and peripheral arterial disease. Chronic kidney disease (CKD) was considered whenever baseline GFR was < 60 mL/min/1.73m2[30]. Chronic lung disease included emphysema, chronic bronchitis and asthma. Patients with cancer included those patients with malignant solid or hematopoietic neoplasm. Sepsis was diagnosed in accordance with the American College of Chest Physicians and the Society of Critical Care Medicine consensus [31].

Variables

Manual patient medical charts and electronic hospital database were reviewed by three investigators (MJM, MR and AF) to study demographic data (age, gender, race), comorbidity (diabetes mellitus, hypertension, CVD, CKD, chronic lung disease, cirrhosis, hepatitis C virus and hepatitis B virus coinfections and cancer), HIV-related characteristics (type of HIV, antiretroviral therapy, CD4 cell count, HIV viral load, stage of HIV infection), SCr, sepsis occurrence, intensive care unit (ICU) admission, etiology of AKI, need for renal replacement therapy (RRT), length of hospital stay and mortality.

The investigators determined the etiology of AKI based on the temporal relationship between the occurrence of AKI and its causes. When more than one attributable cause of AKI was identified the etiology of AKI was considered multifactorial.

Statistical analysis

Continuous variables are expressed as mean (standard deviation) and categorical variables as percentage of number of cases. Comparisons between patients with and without AKI were performed using the Student’s t-test and the χ2 test, respectively, for continuous and categorical variables. Multivariate logistic regression analysis was used to determine risk factors of AKI; only statistically significant variables in the univariate analysis were entered in the multivariate analysis.

Only the first hospitalization was analyzed for patients with multiple admissions. Vital status was ascertained for all patients through hospital database (in 85% of the cases) and phone call to patients or their family by using contact details provided on hospital database (in 15% of cases). Cumulative mortality curves were determined by the Kaplan-Meier method, and log-rank test was employed to analyze statistically significant differences between curves. Cox regression method was used to determine independent predictors of mortality. Risk factors were assessed with univariate analysis, and variables that were statistically significant (P < 0.05) in the univariate analysis were included in the multivariate analysis by applying a multiple forward stepwise Cox regression. Data are presented as hazard ratios (HRs) with 95% confidence intervals (CIs). A two-tailed P-value < 0.05 was considered significant. Analysis was performed with the statistical software package SPSS 19.0 for Windows (Produtos e Serviços de Estatísticas, Lisboa, Portugal).

Results

Sixty-four patients (14.8%) had AKI during hospital stay. Median time to the occurrence of AKI was 8 days (1–59 days). Patients who developed AKI were more likely to have preexisting hypertension (P = 0.034), preexisting CKD (P = 0.001) and AIDS (P = 0.003) and nephrotoxic drugs administration (P < 0.0001) and radiocontrast use (P = 0.017) were more often in those patients. Furthermore, sepsis was more prevalent in patients with AKI (P < 0.0001) and these patients had lengthened time of hospitalization (P < 0.0001), as compared with patients with no acute renal impairment. Individuals with AKI were more likely to have required ICU admission (P = 0.006) (Table 1). AIDS (adjusted OR 2.6, 95% CI 1.1-5.9, P = 0.029), nephrotoxic drugs (adjusted OR 4.6, 95% CI 2.1-10.3, P < 0.0001) and sepsis (adjusted OR 28.8, 95% CI 12.2-67.8, P < 0.0001) were independently associated with increased risk for AKI.

Table 1 Baseline characteristics of 433 hospitalized HIV-infected patients who were alive at hospital discharge

In all cases, there was at least an obvious cause for the development of AKI which was multifactorial in 22 patients (34.4%). The most common etiologies of AKI were sepsis (N = 32; 50%), nephrotoxic drugs administration (N = 23, 35.9%), volume depletion (N = 16, 25%), use of radiocontrast (N = 13, 20.3%) and rhabdomyolysis (N = 6, 9.4%). Other less common causes of AKI were acute urinary tract obstruction (N = 1) and thrombotic microangiopathy (N = 1). Of interest, only one patient was submitted to renal biopsy which revealed thrombotic microangiopathy.

Six of the 64 patients with AKI (9.4%) underwent RRT; all of them received intermittent hemodialysis. The mean duration of dialysis treatments was 10 (9) days.

Median follow-up was 37 months. At follow-up 81 patients (18.7%) died. The probability of death significantly differed among patients with AKI and without AKI during previous hospitalization (Figure 1). At 1, 2 and 5 years of follow-up, the cumulative probability of death of patients with AKI was 21.2, 25 and 31.3%, respectively, as compared with 10, 13.3 and 16.5% in patients without AKI (log-rank, P = 0.011) (Figure 1). In multivariate analysis AKI was associated with increased mortality (adjusted HR 1.7, 95% CI 1.1-3; P = 0.049) (Table 2). The causes of death among AKI patients (N = 18) were sepsis in thirteen patients (72.2%), neoplasm in one patient (5.6%), gastrointestinal bleeding in one patient (5.6%), and it was unknown in three patients (16.7%); sepsis (N = 30; 47.6%), neoplasm (N = 13; 20.6%), cerebrovascular disease (N = 2; 3.2%), progressive multifocal leukoencephalopathy (N = 2; 3.2%), liver failure (N = 1; 1.6%), gastrointestinal bleeding (N = 1; 1.6%), caquexia (N = 1; 1.6%), and undetermined (N = 12; 19%) were the causes of death among patients without AKI (N = 63).

Figure 1
figure 1

Cumulative probability of death. Cumulative probability of death in patients with (green line) and without (blue line) acute kidney injury during previous hospitalization; log-rank test, P = 0.011.

Table 2 Univariate and multivariate analysis including acute kidney injury to determine predictors of mortality

Forty-three patients (67.2%) with AKI had complete renal function recovery, 19 patients (29.7%) with AKI had partial renal function recovery and two patients (3.1%) with AKI were dialysis-dependent at hospital discharge. Mortality did not differ between AKI patients with complete renal function recovery and AKI patients who did not have complete renal function recovery at hospital discharge (27.9% versus 28.6%, P = 0.956).

Discussion

We conducted a retrospective study of a cohort of 433 hospital surviving HIV-infected patients to determine the impact of AKI during hospitalization on long-term mortality. We found that AKI had a negative impact on long-term mortality (median follow-up, 37 months) of these patients. As compared with patients without AKI, patients with AKI had a 1.7-fold risk of death. These findings expand on results from previous studies that showed the increased risk of short-term death associated with AKI in hospitalized HIV-infected patients [22, 23].

It has been shown that patients who survive AKI have a greater rate of long-term mortality and other adverse outcomes than patients who survive hospitalization without AKI, in varied settings, such as community/hospitalized patients, hospitalized patients, ICU patients, septic patients, cardiac surgery, patients undergoing aortic stent placement or percutaneous coronary intervention, liver transplant, lung transplant and hematopoietic cell transplant [3234].

To our knowledge, this is the second study that reports long-term mortality of AKI in hospitalized HIV-infected patients. Recently, Choi and colleagues evaluated the long-term consequences of AKI in HIV-infected persons. For this purpose, they studied 17.325 patients in a national HIV registry during their first hospitalization. Over a mean follow-up period of 5.7 years, they found that AKI was associated with increased mortality and there was a graded relationship between severity of AKI and mortality. Furthermore, long-term risk for heart failure, cardiovascular disease and end-stage renal disease was also higher in patients who developed AKI during hospitalization [35].

The mechanism by which AKI contributes to increased long-term mortality is not completely understood. After an episode of AKI, it is likely that there is failure to resolve renal structure and function adequately [36, 37]. Acute kidney injury itself may increase the risk of subsequent events and decrease kidney reserve leading to an increased risk of CKD. AKI also leads to coagulation abnormalities and increased incidence of sepsis with multi-organ failure as well as to upregulation of cytokines (interleukin-1, interleukin-6, tumor necrosis factor-α) and/or immune-mediated major organ dysfunction (i.e. heart, lungs, and brain) [38, 39]. It should be remembered that in the present study sepsis was a more prevalent cause of death in patients with AKI compared with those patients without AKI (72.2% versus 47.6%, respectively). Similar mechanisms have been directly associated with HIV infection. In fact, HIV leads to chronic immune activation and a prothrombotic state, which also features increases in interleukin-1, interleukin-6, and tumor necrosis factor-α which have been implicated in the pathogenesis of atherosclerosis, progression to AIDS, and mortality in HIV-infected persons [4042]. We hypothesize that AKI may magnify these derangements through these common mechanisms.

In the present study, mortality did not differ among AKI patients with and without complete renal function recovery. These results should be interpreted with extreme caution, since the number of patients may be insufficient to detect a difference on outcome. However, the similar outcome between AKI patients who did or not recover renal function could also be explained by the permanent injury to other vital organs caused by AKI, thus affecting future survival, despite the reversible nature of clinical AKI in which creatinine level returns to baseline after the episode [38, 39].

Our study has some limitations. First, the single-center nature of the study largely limits its generalizability, and its retrospective design with a relatively small cohort of patients did not allow the evaluation of other confounders with prognostic importance. Second, we did not have daily values of SCr and urine output records; therefore, we were not able to capture all cases of AKI which occurred within the hospitalization. Third, we were not able to determine patients` adherence to HAART. Altogether, the high number of patients with no previous diagnosis of HIV infection or without previous followed-up by a specialist and the eventual non-adherence to HAART could explain at least in part low CD4 count and high viral load. Fourth we did not analyze the long-term impact of AKI on cardiovascular disease and end-stage renal disease.

Despite the aforementioned constraints, however, our study has some virtues. First, AKI was diagnosed by the RIFLE criteria based on SCr determinations. Second, contrary to other studies [35], the causes of AKI and the causes of death were determined.

Conclusion

AKI was independently associated with long-term mortality of hospitalized HIV-infected patients and, therefore, these patients should be carefully monitored following hospital discharge.

Abbreviations

AIDS:

Acquired immunodeficiency disease syndrome

AKI:

Acute kidney injury

CI:

Confidence interval

CKD:

Chronic kidney disease

CVD:

Cardiovascular disease

GFR:

Glomerular filtration rate

HAART:

Highly active antiretroviral therapy

HIV:

Human immunodeficiency virus

HR:

Hazard ratio

ICU:

Intensive care unit

RIFLE:

Risk Injury Failure Loss of kidney function End-stage kidney disease

SCr:

Serum creatinine.

References

  1. Hoste EA, Clermont G, Kersten A, Venkataraman R, Angus DC, De Bacquer D, Kellum JA: RIFLE criteria for acute kidney injury are associated with hospital mortality in critically ill patients: a cohort analysis. Crit Care. 2006, 10: R73-10.1186/cc4915.

    Article  PubMed  PubMed Central  Google Scholar 

  2. Ostermann M, Chang RW: Acute kidney injury in the intensive care unit according to RIFLE. Crit Care Med. 2007, 35: 1837-1843. 10.1097/01.CCM.0000277041.13090.0A.

    Article  PubMed  Google Scholar 

  3. Bagshaw SM, George C, Dinu I, Bellomo R: A multi-centre evaluation of the RIFLE criteria for early acute kidney injury in critically ill patients. Nephrol Dial Transplant. 2008, 23: 1203-1210.

    Article  PubMed  Google Scholar 

  4. Lopes JA, Fernandes P, Jorge S, Gonçalves S, Alvarez A, Costa e Silva Z, França C, Prata MM: Acute kidney injury in intensive care unit patients: a comparison between the RIFLE and the Acute Kidney Injury Network classifications. Crit Care. 2008, 12: R110-10.1186/cc6997.

    Article  PubMed  PubMed Central  Google Scholar 

  5. Bagshaw SM, Laupland KB, Doig CJ, Mortis G, Fick GH, Mucenski M, Godinez-Luna T, Svenson LW, Rosenal T: Prognosis for long-term survival and renal recovery in critically ill patients with severe acute renal failure: A population based study. Crit Care. 2005, 9: R700-R709. 10.1186/cc3879.

    Article  PubMed  PubMed Central  Google Scholar 

  6. Liaño F, Felipe C, Tenorio MT, Rivera M, Abraira V, Sáez-de-Urturi JM, Ocaña J, Fuentes C, Severiano S: Long-term outcome of acute tubular necrosis: A contribution to its natural history. Kidney Int. 2007, 71: 679-686. 10.1038/sj.ki.5002086.

    Article  PubMed  Google Scholar 

  7. Lins RL, Elseviers MM, Daelemans R: Severity scoring and mortality 1 year after acute renal failure. Nephrol Dial Transplant. 2006, 21: 1066-1068.

    Article  PubMed  Google Scholar 

  8. UNAIDS: UNAIDS/WHO AIDS Epidemic Update: December 2009. 2009, http://www.unaids.org/en/,

    Google Scholar 

  9. Selik RM, Byers RH, Dworkin MS: Trends in diseases reported on U.S. death certificates that mentioned HIV infection, 1987–1999. J Acquir Immune Defic Syndr. 2002, 29: 378-387.

    Article  PubMed  Google Scholar 

  10. Krentz HB, Kliewer G, Gill MJ: Changing mortality rates and causes of death for HIV-infected individuals living in Southern Alberta, Canada from 1984 to 2003. HIV Med. 2005, 6: 99-106. 10.1111/j.1468-1293.2005.00271.x.

    Article  CAS  PubMed  Google Scholar 

  11. Palella FJ, Baker RK, Moorman AC, Chmiel JS, Wood KC, Brooks JT, Holmberg SD: HIV Outpatient Study Investigators: Mortality in the highly active antiretroviral therapy era: changing causes of death and disease in the HIV outpatient study. J Acquir Immune Defic Syndr. 2006, 43: 27-34. 10.1097/01.qai.0000233310.90484.16.

    Article  CAS  PubMed  Google Scholar 

  12. Gupta SK, Eustace JA, Winston JA, Boydstun II, Ahuja TS, Rodriguez RA, Tashima KT, Roland M, Franceschini N, Palella FJ, Lennox JL, Klotman PE, Nachman SA, Hall SD, Szczech LA: Guidelines for the management of chronic kidney disease in HIV-infected patients: recommendations of the HIV Medicine Association of the Infectious Diseases Society of America. Clin Infect Dis. 2005, 40: 1559-1585. 10.1086/430257.

    Article  PubMed  Google Scholar 

  13. Szczech LA, Hoover DR, Feldman JG, Cohen MH, Gange SJ, Goozé L, Rubin NR, Young MA, Cai X, Shi Q, Gao W, Anastos K: Association between renal disease and outcomes among HIV-infected women receiving or not receiving antiretroviral therapy. Clin Infect Dis. 2004, 39: 1199-1206. 10.1086/424013.

    Article  PubMed  Google Scholar 

  14. Fine DM, Atta MG: Kidney disease in the HIV-infected patient. AIDS Patient Care STDS. 2007, 21: 813-824. 10.1089/apc.2006.0210.

    Article  PubMed  Google Scholar 

  15. Wyatt CM, Winston JA, Malvestutto CD, Fishbein DA, Barash I, Cohen AJ, Klotman ME, Klotman PE: Chronic kidney disease in HIV infection: an urban epidemic. AIDS. 2007, 21: 2101-2103. 10.1097/QAD.0b013e3282ef1bb4.

    Article  PubMed  Google Scholar 

  16. Fine DM, Perazella MA, Lucas GM, Atta MG: Renal disease in patients with HIV infection: epidemiology, pathogenesis and management. Drugs. 2008, 68: 963-980. 10.2165/00003495-200868070-00006.

    Article  CAS  PubMed  Google Scholar 

  17. Franceschini N, Napravnik S, Eron JJ, Szczech LA, Finn WF: Incidence and etiology of acute renal failure among ambulatory HIV-infected patients. Kidney Int. 2005, 67: 1526-1531. 10.1111/j.1523-1755.2005.00232.x.

    Article  PubMed  Google Scholar 

  18. Ibrahim F, Naftalin C, Cheserem E, Roe J, Campbell LJ, Bansi L, Hendry BM, Sabin C, Post FA: Immunodeficiency and renal impairment are risk factors for HIV-associated acute renal failure. AIDS. 2010, 24: 2239-2244. 10.1097/QAD.0b013e32833c85d6.

    Article  CAS  PubMed  Google Scholar 

  19. Valeri A, Neusy AJ: Acute and chronic renal disease in hospitalized AIDS patients. Clin Nephrol. 1991, 35: 110-118.

    CAS  PubMed  Google Scholar 

  20. Rao TK, Friedman EA: Outcome of severe acute renal failure in patients with acquired immunodeficiency syndrome. Am J Kidney Dis. 1995, 25: 390-398. 10.1016/0272-6386(95)90099-3.

    Article  CAS  PubMed  Google Scholar 

  21. Peraldi MN, Maslo C, Akposso K, Mougenot B, Rondeau E, Sraer JD: Acute renal failure in the course of HIV infection: a single institution retrospective study of ninety-two patients and sixty renal biopsies. Nephrol Dial Transplant. 1999, 14: 1578-1585. 10.1093/ndt/14.6.1578.

    Article  CAS  PubMed  Google Scholar 

  22. Wyatt CM, Arons RR, Klotman PE, Klotman ME: Acute renal failure in hospitalized patients with HIV: risk factors and impact on in-hospital mortality. AIDS. 2006, 20: 561-565. 10.1097/01.aids.0000210610.52836.07.

    Article  PubMed  Google Scholar 

  23. Lopes JA, Melo MJ, Viegas A, Raimundo M, Câmara I, Antunes F, Gomes da Costa A: Acute kidney injury in hospitalized HIV-infected patients: a cohort analysis. Nephrol Dial Transplant. 2011, 26: 3888-3894. 10.1093/ndt/gfr192.

    Article  PubMed  Google Scholar 

  24. Bellomo R, Ronco C, Kellum JA, Mehta RL, Palevsky P, Acute Dialysis Quality Initiative workgroup: Acute renal failure - definition, outcome measures, animal models, fluid therapy and information technology needs: the Second International Consensus Conference of the Acute Dialysis Quality Initiative (ADQI) Group. Crit Care. 2004, 8: R204-10.1186/cc2872.

    Article  PubMed  PubMed Central  Google Scholar 

  25. Manjunath G, Sarnak MJ, Levey AS: Prediction equations to estimate glomerular filtration rate: an update. Curr Opin Nephrol Hypertens. 2001, 10: 785-792. 10.1097/00041552-200111000-00009.

    Article  CAS  PubMed  Google Scholar 

  26. Bagshaw SM, George C, Bellomo R, ANZICS Database Management Committee: A comparison of the RIFLE and AKIN criteria for acute kidney injury in critically ill patients. Nephrol Dial Transplant. 2008, 23: 1569-1574. 10.1093/ndt/gfn009.

    Article  PubMed  Google Scholar 

  27. 1993 revised classification system for HIV infection and expanded surveillance case definition for AIDS among adolescents and adults. MMWR Recomm Rep. 1992, 41: 1-19.

  28. Alberti KG, Zimmet PZ: Definition, diagnosis and classification of diabetes mellitus and its complications. Part 1: diagnosis and classification of diabetes mellitus provisional report of a WHO consultation. Diabet Med. 1998, 15: 539-553. 10.1002/(SICI)1096-9136(199807)15:7<539::AID-DIA668>3.0.CO;2-S.

    Article  CAS  PubMed  Google Scholar 

  29. Chobanian AV, Bakris GL, Black HR, Cushman WC, Green LA, Izzo JL, Jones DW, Materson BJ, Oparil S, Wright JT, Roccella EJ, Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. National Heart, Lung, and Blood Institute; National High Blood Pressure Education Program Coordinating Committee: The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure: the JNC 7 report. JAMA. 2003, 289: 2560-2572. 10.1001/jama.289.19.2560.

    Article  CAS  PubMed  Google Scholar 

  30. National Kidney Foundation: K/DOQI clinical practice guidelines for chronic kidney disease: evaluation, classification, and stratification. Am J Kidney Dis. 2002, 39 (2 Suppl 1): S1-S266.

    Google Scholar 

  31. Levy MM, Fink MP, Marshall JC, Abraham E, Angus D, Cook D, Cohen J, Opal SM, Vincent JL, Ramsay G, SCCM/ESICM/ACCP/ATS/SIS: 2001 SCCM/ESICM/ACCP/ATS/SIS International Sepsis Definitions Conference. Crit Care Med. 2003, 31: 1250-1256. 10.1097/01.CCM.0000050454.01978.3B.

    Article  PubMed  Google Scholar 

  32. Coca SG, Yusuf B, Shlipak MG, Garg AX, Parikh CR: Long-term risk of mortality and other adverse outcomes after acute kidney injury: a systematic review and meta-analysis. Am J Kidney Dis. 2009, 6: 961-973.

    Article  Google Scholar 

  33. Lopes JA, Gonçalves S, Jorge S, Raimundo M, Resende L, Lourenço F, Lacerda JF, Martins C, do Carmo JA, Lacerda JM, Prata MM: Contemporary analysis of the influence of acute kidney injury after reduced intensity conditioning haematopoietic cell transplantation on long-term survival. Bone Marrow Transplant. 2008, 42: 619-626. 10.1038/bmt.2008.207.

    Article  CAS  PubMed  Google Scholar 

  34. Lopes JA, Fernandes P, Jorge S, Resina C, Santos C, Pereira A, Neves J, Antunes F, Prata MM: Long-term risk of mortality after acute kidney injury in patients with sepsis: a contemporary analysis. BMC Nephrol. 2010, 11: 9-10.1186/1471-2369-11-9.

    Article  PubMed  PubMed Central  Google Scholar 

  35. Choi AI, Li Y, Parikh C, Volberding PA, Shlipak MG: Long-term clinical consequences of acute kidney injury in the HIV-infected. Kidney Int. 2010, 78: 478-485. 10.1038/ki.2010.171.

    Article  PubMed  PubMed Central  Google Scholar 

  36. Basile DP, Donohoe D, Roethe K, Osborn JL: Renal ischemic injury results in permanent damage to peritubular capillaries and influences long-term function. Am J Physiol Renal Physiol. 2001, 281: F887-F899.

    Article  CAS  PubMed  Google Scholar 

  37. Basile DP: Rarefaction of peritubular capillaries following ischemic acute renal failure: a potential factor predisposing to progressive nephropathy. Curr Opin Nephrol Hypertens. 2004, 13: 1-7. 10.1097/00041552-200401000-00001.

    Article  PubMed  Google Scholar 

  38. Kelly KJ: Distant effects of experimental renal ischemia/reperfusion injury. J Am Soc Nephrol. 2003, 14: 1549-1558. 10.1097/01.ASN.0000064946.94590.46.

    Article  CAS  PubMed  Google Scholar 

  39. Li X, Hassoun HT, Santora R, Rabb H: Organ crosstalk: the role of the kidney. Curr Opin Crit Care. 2009, 15: 481-487. 10.1097/MCC.0b013e328332f69e.

    Article  PubMed  Google Scholar 

  40. Kedzierska K, Crowe SM: Cytokines and HIV-1: interactions and clinical implications. Antivir Chem Chemother. 2001, 12: 133-150.

    Article  CAS  PubMed  Google Scholar 

  41. Hunt PW, Martin JN, Sinclair E, Bredt B, Hagos E, Lampiris H, Deeks SG: T cell activation is associated with lower CD4+ T cell gains in human immunodeficiency virus-infected patients with sustained viral suppression during antiretroviral therapy. J Infect Dis. 2003, 187: 1534-1543. 10.1086/374786.

    Article  CAS  PubMed  Google Scholar 

  42. Kuller LH, Tracy R, Belloso W, De Wit S, Drummond F, Lane HC, Ledergerber B, Lundgren J, Neuhaus J, Nixon D, Paton NI, Neaton JD, INSIGHT SMART Study Group: Inflammatory and coagulation biomarkers and mortality in patients with HIV infection. PLoS Med. 2008, 5: e203-10.1371/journal.pmed.0050203.

    Article  PubMed  PubMed Central  Google Scholar 

Pre-publication history

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to José António Lopes.

Additional information

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

JAL have made substantial contributions to conception and design, analysis and interpretation of data, as well as has been involved in drafting the manuscript and revising it critically for important intellectual content. MJM and MR have collected data. FA has revised the manuscript critically for important intellectual content. All authors have given final approval of the version to be published. All authors read and approved the final manuscript.

José António Lopes, Maria João Melo contributed equally to this work.

Authors’ original submitted files for images

Below are the links to the authors’ original submitted files for images.

Authors’ original file for figure 1

Rights and permissions

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reprints and permissions

About this article

Cite this article

Lopes, J.A., Melo, M.J., Raimundo, M. et al. Long-term risk of mortality for acute kidney injury in HIV-infected patients: a cohort analysis. BMC Nephrol 14, 32 (2013). https://doi.org/10.1186/1471-2369-14-32

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1186/1471-2369-14-32

Keywords