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Transplantation
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Congestive Heart Failure in Renal Transplant Recipients: Risk Factors, Outcomes, and Relationship with Ischemic Heart Disease

Claudio Rigatto, Patrick Parfrey, Robert Foley, Carol Negrijn, Carrie Tribula and John Jeffery
JASN April 2002, 13 (4) 1084-1090;
Claudio Rigatto
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Patrick Parfrey
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Robert Foley
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Carol Negrijn
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Carrie Tribula
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John Jeffery
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Abstract

ABSTRACT. Cardiovascular disease (CVD) is the major cause of death in renal transplant recipients (RTR). Several cohort studies have examined CVD in RTR, but none have addressed the development of congestive heart failure (CHF). CHF would hypothetically be a frequent and prognostically important event in RTR. A retrolective cohort study was, therefore, conducted in two Canadian centers to describe the incidence, risk factors for, and interrelationships between de novo CHF, de novo ischemic heart disease (IHD), and mortality in 638 consecutive adult RTR who were free of cardiac disease at 1 yr posttransplant. Detailed clinic and hospital records were available for 99% of patients. Median follow-up was 7 yr (range, 1 to 28 yr). De novo CHF occurred as frequently as de novo IHD (1.26 versus 1.22 events/100 patient-years, respectively) and appeared to carry a similar prognosis (relative risk for death, 1.78 [confidence interval, 1.21 to 2.61] for CHF versus 1.50 [1.05 to 2.13] for IHD). The incidence of CHF was considerably higher than that in the Framingham cohort, whereas the incidence of IHD was not, suggesting that renal transplantation might correspond more to a state of “accelerated heart failure” than to “accelerated atherosclerosis.” Age, diabetes, gender, BP, and anemia were identified as independent risk factors for de novo CHF, whereas age, diabetes, gender, BP, and rejection were independent risk factors for de novo IHD. Optimal strategies for treatment of BP and anemia in RTR will need to be determined in randomized controlled trials.

Cardiovascular disease (CVD) is the major cause of death among renal transplant recipients (RTR) (1,2). The manifestations of cardiac disease comprise both disorders of perfusion, presenting primarily as ischemic heart disease (IHD; e.g., myocardial infarction [MI], angina pectoris) and disorders of left ventricular function, presenting primarily as congestive heart failure (CHF). Both CHF and IHD are important adverse prognostic markers in the general population. In dialysis patients, CHF occurs frequently and is a stronger predictor of mortality than IHD (3).

Although several high-quality cohort studies have addressed the subject of cardiovascular disease in RTR, none have examined the incidence, determinants, and prognosis of CHF in renal transplants (1,2,4–7). As renal transplantation is often a state of chronic renal insufficiency, we hypothesized that CHF would occur frequently, would be associated with potentially reversible risk factors, and would be a prognostically important event among RTR. We therefore conducted a retrolective cohort study in two Canadian centers to describe the risk factors for and interrelationships between de novo CHF, de novo IHD, and mortality in a cohort of patients who were alive with a functioning graft and free of clinical cardiac disease at 1 yr after transplantation.

Materials and Methods

Design

Cohort Definition.

We assembled a retrolective cohort of 638 consecutive adult RTR (age, >18 yr) who were followed since inception in Winnipeg, Manitoba (n = 473) and St. John’s, Newfoundland (n = 165). Patients were included in the cohort if they were alive with functioning graft and free of clinical heart disease at 1 yr after transplantation. Patients with known pretransplant cardiac disease were excluded, because cardiac disease at the time of transplantation is due to risk exposures before transplantation and might confound the relationship between posttransplant risk factors and subsequent outcomes. Patients having events in the first year were excluded because events in the first year could not be reasonably attributed to posttransplant variables measured during the same interval. The cohort as defined comprised 62% of all consecutive RTR followed in Manitoba and Newfoundland between 1969 and 1999.

The Manitoba patients received transplants between 1969 and 1999, and the Newfoundland patients received transplants between 1975 and 1999. All patients were followed exclusively at the Health Sciences Center, Winnipeg, and the Health Sciences Center, St. John’s. Detailed clinic and hospital records were available for 99% of patients. Trained research nurses reviewed all inpatient and outpatient records, abstracting data on baseline demographic, clinical, and outcome variables. The detail available permitted systematic application of a priori definitions for most outcomes.

Study Variables and Definitions.

Baseline Variables.

Age, gender, presence or absence of diabetes, living or cadaveric donor status, and smoking status were abstracted from the pretransplant assessment records. IHD and CHF were judged to be absent at baseline if the pretransplant assessment concluded that they were absent. Cardiovascular disease was a focus of the pretransplant assessment protocol, and diagnosis was based on oral history, records review, physical examination, and electrocardiogram, with further testing reserved for symptomatic individuals or diabetics. Hypertension before transplantation was defined as BP >140/90 mmHg or need for antihypertensive therapy. Use of angiotensin-converting enzyme inhibitors was recorded. Era of transplantation was defined as transplantation before or after 1985, the year in which cyclosporine became part of the routine maintenance immunosuppression protocol at both centers. Before 1985, the majority of patients received azathioprine and prednisone alone. Delayed graft function was defined as need for dialysis in the first 2 wk after renal transplantation. Acute rejection was defined as an acute rise in serum creatinine of at least 10% that was not attributable to prerenal causes, obstruction, or cyclosporine toxicity and that was treated with pulse steroids and/or antilymphocyte preparations. Delayed graft function (DGF) was defined as need for dialysis in the first 2 wk after transplantation. Systolic and diastolic BP, hemoglobin, albumin, and serum creatinine were measured at least quarterly per clinic protocol, and total cholesterol was measured yearly.

Outcome Variables.

CHF was defined clinically as dyspnea plus two of the following: raised jugular venous pressure, bibasilar crackles, chest x-ray evidence of pulmonary venous hypertension, or pulmonary edema (8). De novo CHF was defined as CHF occurring for the first time in a patient previously free of CHF. An episode of IHD was defined as hospitalization for acute MI or revascularization (coronary artery bypass grafting or percutaneous transluminal angioplasty). MI was defined as the presence of chest pain accompanied by characteristic electrocardiogram changes of infarction or a threefold elevation in creatine kinase levels. Cardiovascular death was defined as death from myocardial infarction or a revascularization procedure, cardiogenic shock, primary arrhythmia, stroke, or ruptured aortic aneurysm.

Statistical Analyses

Normally distributed continuous variables are expressed as mean (SD); non-normally distributed variables are expressed as median (interquartile range). Categorical variables are expressed as percentages. Outcomes are described using event-free Kaplan-Meier survival curves. Patients were censored at graft failure, latest follow-up, or death, except where death was the end point being analyzed. Cox proportional hazards regression was used for both univariate and multivariate analyses. Backwards conditional stepping operative on the complete variable pool was used to select the best multivariate model. The proportional hazards assumption was checked by inspection of the log (−log)-transformed survival curves. Values for systolic BP, diastolic BP, hemoglobin, creatinine, Gault-Cockroft creatinine clearance, and albumin were averaged over the first year for each patient. If more than one total cholesterol level was available in the first year, these were also averaged.

Time-Dependent Analyses.

To estimate the impact of intermediate events (i.e., de novo CHF and IHD) occurring at variable follow-up times on subsequent mortality, time-dependent variables were created and included in a time-dependent proportional hazards analysis (9). For the case of CHF, the time-dependent variable created was assigned a value of 0 for follow-up times before the first de novo CHF episode and a value of 1 for follow-up times after the first episode. For patients who did not develop de novo CHF, the time-dependent variable was always 0. The time-dependence of de novo IHD was handled in the same way. The independent effect of de novo IHD and CHF on mortality was estimated by including both time-dependent covariates in the same model. CHF and IHD were assessed independently, and the observations were not mutually exclusive; therefore, the model correctly handled the occurrence of both events in the same patient. The impact of de novo IHD on subsequent CHF was handled analogously by including the time-dependent IHD variable as a covariate in a proportional hazards model of predictors of de novo CHF. Only IHD events preceding or coincident with CHF were analyzed this way, because events occurring after the development of CHF cannot be causally associated with that end point.

Missing Values.

Missing values were replaced by random imputation (10). The proportion of values randomly imputed were as follows: creatinine clearance, 4%; hemoglobin, 7.7%; BP, 7.8%; albumin, 12.5%; cholesterol, 41%; smoking, 15.7%; and DGF, 26%. All other variables were complete. The random imputation procedure was repeated four times, and the data were reanalyzed using each set of imputed values to test the robustness of the results. As an additional check, multivariate normal imputation was used (11). The resultant models were nearly identical; therefore, the imputation method had negligible impact on the results.

Results

Patient Characteristics

Of the 1021 adult patients followed since inception at both centers from 1969 to 1999, 638 (62%) were alive with functioning graft and free of cardiac disease at 1 yr (Figure 1). Selected baseline characteristics and averaged clinical and laboratory variables in the first year are summarized in Table 1.

Figure1
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Figure 1. Source of the cohort analyzed for de novo heart disease.

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Table 1.

Selected baseline characteristics of 638 consecutive renal transplant patients free of cardiac disease at 1 yr posttransplanta

Incidence and Determinants of De Novo CHF

Over a median follow-up of 7.2 yr (range, 1 to 28 yr) (total follow-up of 5654 patient-years), 63 patients developed de novo CHF after the first posttransplant year. The average incidence rate of CHF was 1.26 events/100 patient-years. The cumulative incidence of de novo CHF, estimated using the Kaplan-Meier method, was 3.6% (range, 2.0 to 5.2%) at 5 yr, 12.1% (8.6 to 15.5%) at 10 yr, and 21.6% (15.0 to 28.2%) at 20 yr (Figure 2A). The univariate predictors of de novo CHF were age, diabetes, declining renal function, low hemoglobin, low albumin, higher BP, cadaveric donor, and allograft rejection (Table 2). The multivariate analysis identified age, diabetes, low hemoglobin, elevated systolic BP, low serum albumin, and cadaveric donation as significant independent risk factors for de novo CHF (Table 2). Diastolic BP could be substituted for systolic without diminishing model significance. Gault-Cockroft estimated creatinine clearance (ECC) and rejection were NS after multivariate adjustment.

Figure2
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Figure 2. Kaplan-Meier event-free survival curves for de novo congestive heart failure (CHF) (A) and de novo ischemic heart disease (IHD) (B).

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Table 2.

Risk factors for de novo CHF as determined by Cox regression in 638 adult patients who were alive with functioning graft and free of clinical heart disease (CAD or CHF) at 1 yra

To explore the relationship between hemoglobin and de novo CHF, we modeled the relative hazard associated with each hemoglobin quartile adjusted for the influence of the other variables in the model (Figure 3). We found a progressive increase in relative hazard with a decline in hemoglobin <138 most pronounced and significant for patients in the lower two quartiles (hemoglobin <126). This suggests that even modest reductions in hemoglobin may be associated with cardiac morbidity. Similar trends were observed in a quartile analysis of BP (Figure 4). As with hemoglobin, a threshold effect was not apparent.

Figure3
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Figure 3. Relative hazard (risk) of de novo CHF as a function of hemoglobin quartile in a cohort of 638 renal transplant recipients (RTR) alive with functioning graft and free of clinical heart disease at 1 yr posttransplant. **Adjusted for age, diabetes, systolic BP, donor status, and serum albumin; †P < 0.03 with respect to reference quartile.

Figure4
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Figure 4. Relative hazard (risk) of de novo CHF as a function of systolic and diastolic BP quartiles in a cohort of 638 RTR alive with functioning graft and free of clinical heart disease at 1 yr posttransplant.

Renal function (ECC) was not independently associated with CHF in the present cohort, although it was a strong univariate predictor. We searched for confounding bias between ECC and other variables to identify which variables replaced it in the multivariate analysis. BP was the most powerful confounder, followed by hemoglobin, age, and diabetes. With these four variables added to the model, the relative risk reduction associated with a 10 ml/min increment in ECC became negligible, suggesting that the impact of ECC on CHF is mediated primarily by hemodynamic factors, age, and diabetes.

Incidence and Determinants of De Novo IHD

Sixty-one patients developed de novo IHD over the observation period. The average incidence was 1.22 events/100 patient-years, the same as that of de novo CHF. The cumulative incidence of de novo IHD, estimated using the Kaplan-Meier method, was 4.5% (2.7 to 6.3%) at 5 yr, 11.5% (8.1 to 14.9%) at 10 yr, and 22.9% (15.5 to 30.3%) at 20 yr (Figure 2B). On univariate analysis (Table 3), age, gender, diabetes, BP, and allograft rejection were significant predictors of de novo IHD, and these associations persisted in the multivariate analysis (Table 3). A center effect was observed in the univariate analysis but disappeared in the multivariate model, suggesting the effect was due to case-mix differences between centers.

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Table 3.

Risk factors for de novo IHD as determined by Cox regression in 638 adult patients who were alive with functioning graft and free of clinical heart disease at 1 yra

Prognostic Impact of De Novo CHF and De Novo IHD

The crude survival of patients who developed de novo CHF and de novo IHD versus those who did not is illustrated in Figure 5, A and B. Using a proportional hazards model incorporating time-dependent covariates for the occurrence of CHF and IHD, we found that the relative hazard of death associated with de novo CHF was very similar to that associated with de novo IHD (Table 4). These effects were independent of age, diabetes, and gender.

Figure5
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Figure 5. Survival in patients who did and did not develop de novo CHF (A) and de novo IHD (B).

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Table 4.

Impact of de novo CHF and IHD on survival in 638 adult patients who were alive with functioning graft and free of clinical heart disease (CAD or CHF) at 1 yr

Role of IHD in the Genesis of CHF

Of the 63 patients who developed de novo CHF, 19 patients (30%) also developed IHD. IHD preceded CHF in 13 cases, coincided with it in 5, and followed it in only one case. Using a proportional hazards model incorporating a time-dependent covariate for the occurrence of IHD, development of de novo IHD was associated with a twofold risk for de novo CHF, independent of all the previously identified risk factors for de novo CHF summarized in Table 2. These other risk factors, particularly low hemoglobin and high BP, remained significant independently of IHD.

Determinants of Mortality

Overall mortality in this healthy cohort was low (2.5 deaths/100 patient-years). Nearly half the deaths were from cardiovascular causes (Table 5). As expected, factors predicting de novo CHF or IHD (i.e., age, diabetes, anemia, hypertension, cadaveric donation, and smoking) also predicted all-cause and cardiovascular death (Table 6).

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Table 5.

Causes of death in 638 renal transplant patients who were alive with a functioning graft and free of cardiac disease at 1 yr posttransplantation

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Table 6.

Multivariate risk factors for all-cause and cardiovascular death as determined by Cox regression in a cohort of 638 adult patients who were alive with a functioning graft and free of clinical heart disease at 1 yr

Discussion

A small number of high-quality cohort studies have examined risk factors for cardiovascular disease and death in renal transplant patients (1,2,4–7). Our study is the first to examine the incidence, determinants, and prognosis of CHF in RTR. We found that de novo CHF occurred as frequently as de novo IHD and was associated with a similar adverse risk of death. This observation is consistent with data in dialysis patients and (8,12), but it contrasts with data in the general population, where CHF occurs much less frequently than IHD. Whereas the incidence of de novo CHF in our cohort was approximately two to five times higher than observed in population-based cohorts from Framingham and Minnesota (13,14), the incidence of de novo IHD was similar to that observed in Framingham (15). Relative to the general population, the renal transplant state may be characterized more by a tendency toward CHF than toward IHD, in contrast to the prevailing paradigm (1). A more formal comparison, adjusting for case-mix differences between renal transplant and general population cohorts, would have to be performed to further explore this hypothesis.

Our multivariate analysis showed that age, diabetes, development of IHD, BP, anemia, serum albumin, and cadaveric donation were independently associated with de novo CHF. Although IHD appears to be an important element in the causation of CHF, de novo IHD preceded de novo CHF in only 18 (29%) of 63 patients, suggesting other factors are responsible in many cases. Hypertension and anemia are recognized hemodynamic stressors and imparted substantial risk of CHF even after adjustment for de novo IHD. Several direct and indirect observations support a causal association between these hemodynamic factors and CHF. First, both anemia and hypertension were documented to exist well before the development of CHF. Second, a monotonic increasing risk of CHF was observed with worsening hypertension and anemia (Figures 3 and 4), consistent with a causal association. Third, studies in renal transplantation, chronic renal insufficiency, and dialysis have consistently documented the association between hypertension/anemia and left ventricular growth (15–17). It is therefore plausible that anemia and hypertension promoted ventricular growth and remodeling in our cohort, leading to congestive heart failure.

The role of hypoalbuminemia in the development of CHF is less clear. Hypoalbuminemia has also been associated with congestive heart failure and progressive left ventricular cavity enlargement in dialysis patients (18). It is thought to be a marker of malnutrition and/or chronic inflammation, either of which could promote cardiomyocyte attrition, cardiomyopathy, and CHF (19). The role of cadaveric donation in the genesis of CHF is probably noncausal, reflecting unmeasured patient selection biases, with cadaveric kidneys being preferred in cases of marginal recipients.

Although acute rejection was not directly associated with de novo CHF, it was predictive of de novo IHD, which in turn predicted de novo CHF. Acute rejection was not a marker for the adverse risk associated with steroid or OKT3 treatment, because neither factor was linked to cardiac outcomes (data not shown). Repeated episodes of acute rejection may cause upregulation of acute phase reactants, such as CRP. These factors have been independently associated with adverse cardiac events in the general population (20). A similar association may pertain in RTR.

Renal function was not an independent predictor of incident IHD or CHF. Multivariate modeling suggested that the impact of renal function on CHF is largely the result of hypertension and anemia, known correlates of renal failure. Similarly, immunosuppressive regimen was not associated with cardiovascular outcomes after multivariate adjustment.

These observations may be integrated into the pathophysiologic schema proposed in Figure 6. In this hypothesis, age, diabetes, and markers of unmeasured patient factors (e.g., cadaveric donation) determine the baseline cardiac geometry. Chronic hemodynamic stresses from anemia and hypertension promote wall hypertrophy and cavity enlargement. Tissue ischemia (i.e., IHD), malnutrition, and inflammation contribute to cardiomyocyte death and left ventricular dilation. The resultant cardiomyopathy is clinically expressed as CHF. Although omitted for clarity, factors such as renal function, rejection, and immunosuppressive medications can still influence development of CHF indirectly via effects on BP, anemia, nutrition, and IHD. Further testing of this framework will require clinical trials of risk factor interventions, especially for hypertension and anemia, here identified as major reversible risk factors.

Figure6
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Figure 6. Pathogenesis of CHF in RTR: A hypothesis.

Several limitations of this analysis deserve mention. First, in retrolective cohort designs, relevant data may at times be missing. This problem was minimized in this study by the exclusive follow-up of patients at two centers, each operating in relative geographic isolation. This resulted in excellent data capture over a long follow-up period. Most of the risk factors of interest were obtained as part of the clinic protocols. The availability of complete outpatient and hospital records allowed the application of a priori study definitions to outcome events. The quality of the data may approach that obtainable in a prolective cohort study. Second, in observational studies, causal inferences are weaker than in experimental designs addressing the same hypothesis. Our findings regarding hypertension and anemia should ideally be confirmed in clinical trials. Finally, because most of the cohort was derived from the 1970s and 1980s, use of angiotensin-converting enzyme inhibitors was limited, and the impact of this variable on outcome could not be addressed.

In conclusion, de novo CHF occurs as commonly as de novo IHD in RTR, and it carries a similar adverse prognosis. The incidence of CHF appears to be considerably higher than that in the general population, whereas the incidence of IHD was not, suggesting that renal transplantation may correspond better to a state of “accelerated heart failure” than to one of “accelerated atherosclerosis.” Age, diabetes, gender, BP, and anemia appear to be dominant risk factors in the development of de novo CHF, whereas age, diabetes, gender, BP, and rejection appear to be dominant risk factors for de novo IHD in renal transplant recipients. Effective strategies for treatment of reversible risk factors, in particular BP and anemia, will need to be determined in randomized controlled trials.

Acknowledgments

This study was supported by an unrestricted educational grant from Janssen-Ortho Canada. Dr. Rigatto is a recipient of the Kidney Foundation of Canada Biomedical Fellowship 1998–2000. Dr. Parfey holds a Distinguished Scientist Award from the Canadian Institute for Health Research.

  • © 2002 American Society of Nephrology

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Journal of the American Society of Nephrology: 13 (4)
Journal of the American Society of Nephrology
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1 Apr 2002
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Congestive Heart Failure in Renal Transplant Recipients: Risk Factors, Outcomes, and Relationship with Ischemic Heart Disease
Claudio Rigatto, Patrick Parfrey, Robert Foley, Carol Negrijn, Carrie Tribula, John Jeffery
JASN Apr 2002, 13 (4) 1084-1090;

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Congestive Heart Failure in Renal Transplant Recipients: Risk Factors, Outcomes, and Relationship with Ischemic Heart Disease
Claudio Rigatto, Patrick Parfrey, Robert Foley, Carol Negrijn, Carrie Tribula, John Jeffery
JASN Apr 2002, 13 (4) 1084-1090;
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  • Posttransplantation Anemia: Mechanisms and Management
  • Topics in Transplantation Medicine for General Nephrologists
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