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Suicide in the United States End-Stage Renal Disease Program

Manjula Kurella^*, Paul L. Kimmel, Belinda S. Young^* and Glenn M. Chertow^*

^* Division of Nephrology, Moffitt-Long Hospitals and UCSF-Mt. Zion Medical Center, Department of Medicine, University of California San Francisco, San Francisco, California; and Division of Renal Diseases and Hypertension, Department of Medicine, George Washington University Medical Center, Washington, DC

Address correspondence to: Dr. Glenn M. Chertow, Department of Medicine Research, University of California San Francisco, Laurel Heights, 3333 California Street, Suite 430, San Francisco, CA 94118-1211. Phone: 415-476-2173; Fax: 415-476-9531; E-mail: chertowg{at}medicine.ucsf.edu

	Abstract

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Although depression and dialysis withdrawal are relatively common among individuals with ESRD, there have been few systematic studies of suicide in this population. The goals of this study were to compare the incidence of suicide with national rates and to contrast the factors associated with suicide with those associated with withdrawal in persons with ESRD. All individuals who were aged 15 yr and older and initiated dialysis between April 1, 1995, and November 30, 2000, composed the analytic cohort. Patients were censored at the time of death, transplantation, or October 31, 2001. Death as a result of suicide in the ESRD population and the general US population was ascertained from the Death Notification Form and the Centers for Disease Control and Prevention, respectively. Standardized incidence ratios for suicide among patient subgroups were computed using national data from the year 2000 as the reference population. The crude suicide rate from 1995 to 2001 was 24.2 suicides per 100,000 patient-years, and the overall standardized incidence ratio for suicide was 1.84 (95% confidence interval, 1.50 to 2.27). In multivariable models, age 75 yr, male gender, white or Asian race, geographic region, alcohol or drug dependence, and recent hospitalization with mental illness were significant independent predictors of death as a result of suicide. Persons with ESRD are significantly more likely to commit suicide than persons in the general population. Although relatively rare, risk assessment can be used to identify patients for whom counseling and other interventions might be beneficial.

	Introduction

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Two of the authors were prompted to conduct this analysis on the basis of their experience with caring for a patient who was on dialysis and died of suicide. Certain details of the case presentation were modified to retain anonymity.

	Case Presentation

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The patient was a white man who was in his late 20s, had a history of paranoid schizophrenia and tobacco and alcohol abuse, and developed rapidly progressive glomerulonephritis with pulmonary hemorrhage. Despite aggressive anti-inflammatory and immunosuppressive therapy, he failed to recover kidney function and required long-term hemodialysis. After a prolonged hospital course complicated by respiratory failure that required mechanical ventilation, tracheostomy, and multiple infections, he was discharged, able to ambulate and perform most usual activities. After a brief stay at a "halfway house," he moved to a single-room-occupancy hotel. He continued to receive intermittent counseling at a community-based activities center and occasionally saw a psychiatrist.

Two years after initiating dialysis, the patient requested a change in dialysis modality, as he reported paranoid ideations related to other patients and staff at the hemodialysis facility. Despite initial reluctance, we approved his transition to peritoneal dialysis on the basis of the excellent understanding and technique that he demonstrated during training and his level of enthusiasm, which seemed to provide some focus to his otherwise chaotic behavior and thinking. The patient did well for >1 yr but developed fungal peritonitis and required a transition back to hemodialysis.

Several months later, the patient was admitted to a community hospital for acute psychosis with suicidal ideation. After several days, he was discharged, having been considered at low suicide risk. Approximately 2 d later, the patient fell to his death after jumping off the roof of an apartment building. On autopsy, there was no evidence of alcohol or drug ingestion.

	Introduction

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The earliest reports on suicide in ESRD, published before Medicare benefits were extended to the ESRD program, suggested extremely high rates of suicide in patients who were treated with hemodialysis (1). These results were attributed to a highly selected population that underwent an arduous, heroic procedure and have been disputed by those who argue that withdrawal of dialysis and suicide are distinct entities (2). Despite the high prevalence of depression among individuals with ESRD (3–5), there have been few systematic contemporary studies of suicide in this population. It is unclear whether early estimates of suicide risk in ESRD are applicable today. In 1990, the ESRD Death Notification Form was revised, permitting separation of withdrawal from dialysis from suicide and other causes of death. Accordingly, recent data from the United States Renal Data System (USRDS) indicate that suicide occurs at a rate of two deaths per 10,000 patient-years, suggesting only a modestly increased risk for suicide compared with the general population (6). However, direct comparison with general population data may be misleading without adjustment for age and other important suicide risk factors. Thus, it remains uncertain whether persons with ESRD are at increased risk for suicide.

In contrast to suicide, withdrawal from dialysis before death is common, occurring approximately 100 times more commonly than suicide (6). Although risk factors for withdrawal have been well characterized (7–9), it is unclear whether patients who withdraw from dialysis and patients who commit suicide share similar characteristics. Moved by the tragic case presented above, we sought to understand better the factors associated with suicide in persons with ESRD and to compare the incidence of suicide in ESRD with national suicide rates by using data on a full national cohort of ESRD patients and the US population.

	Methods

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We used data from the USRDS on all persons who initiated dialysis between April 1, 1995, and November 30, 2000, and were followed until death, transplantation, or October 31, 2001. Patients who were younger than 15 yr were excluded, leaving 465,563 patients in the analytic cohort. Patient demographics, treatment history, and cause-specific mortality including death from suicide or withdrawal from dialysis before death were obtained from the Standard Analytic Files (Core CD 1). Twenty-two patients were coded as both having died from suicide and as having withdrawn from dialysis before death. These patients were considered to have withdrawn from dialysis for the purposes of these analyses. Demographic characteristics, comorbid conditions, insurance and social history, and selected laboratory data at the time of dialysis initiation were obtained from the Center for Medicare and Medicaid Services (CMS) Medical Evidence form (form 2728). We merged baseline data elements with data on hospitalization for the 12 mo preceding death or the date of last follow-up. We determined the number of hospital admissions, length of stay, and discharge diagnoses for each individual during the 12-mo interval. Hospitalization with a mental illness was indicated by Diagnosis Related Groups (DRG) codes 424 to 431. Patients who were hospitalized with drug or alcohol abuse (indicated by DRG codes 432 to 437) were included with those coded as having alcohol or drug dependence.

	Statistical Analyses

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Continuous variables were expressed as mean ± SD or median ± interquartile range and compared with t test or the Wilcoxon rank sum test, as appropriate. Categorical variables were expressed as proportions and compared using the ² test. We calculated age-, gender-, race-, and network-specific suicide rates using the year 2000 US population as the reference population. National suicide data were available from the Centers for Disease Control and Prevention Web-Based Injury Statistics Query and Reporting System. Standardized incidence ratios (SIR) for suicide among patient subgroups were computed as the ratio of observed versus expected suicides. We computed confidence intervals (CI) using the normal approximation to the Poisson distribution (10). Data for ESRD networks were condensed into four geographic regions for ease of presentation and confidentiality concerns: Northeast (networks 1 to 4), South (networks 5 to 8, 13, and 14), Midwest (networks 9 to 12), and West (networks 15 to 18). Note that Web-Based Injury Statistics Query and Reporting System does not contain suicide data from Puerto Rico and the US Virgin Islands (included in network 3) or from Guam, American Samoa, and Saipan (included in network 17).

We first used simple logistic regression to examine the relation between dialysis vintage and suicide. We then used proportional regression (Cox) models to determine the unadjusted and multivariable-adjusted hazard or relative risk (RR) of suicide for covariates of interest, modeled for censored failure times. Patients were censored with transplantation or on October 31, 2001. After the initial multivariable models were fit, we manually added individual selected variables to evaluate for residual confounding. We evaluated effect modification by including selected multiplicative interaction terms in multivariable models. We also performed companion analyses using dialysis withdrawal, rather than suicide, as the outcome of interest. For all analyses, two-tailed P < 0.05 was considered significant. Analyses were conducted using SAS Version 8.2 (SAS Institute, Cary, NC).

	Results

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Patient Characteristics
Of the 465,563 patients included in the analysis, 44,465 (9.6%) withdrew from dialysis before death and 264 (0.005%) died from suicide. Table 1 shows the demographic characteristics of the study population. Patients who withdrew from dialysis before death had a mean age of 71 ± 12 yr, 49.2% were male, and 81.1% were white. Patients who died from suicide had a mean age of 63 ± 15 yr, 86.0% were male, and 85.2% were white. Compared with patients who withdrew before death, patients who died from suicide were younger (P < 0.001); more likely to be male (P < 0.001), uninsured (P < 0.001), and have alcohol or drug dependency (P < 0.001); and were less likely to be black (P = 0.04) and nonambulatory (P = 0.02) and have diabetes (P = 0.002), congestive heart failure (P = 0.01), or previous stroke (P = 0.04).

SIR for Suicide in the United States
The crude suicide rate from 1995 to 2001 was 24.2 suicides per 100,000 patient-years. The overall SIR for suicide during this period was 1.84 (95% CI, 1.50 to 2.27). In other words, patients with ESRD had an 84% higher rate of suicide compared with the general US population, after accounting for differences in population distribution. The SIR for suicide stratified by age, gender, race, and geographic region are shown in Table 4. The rates of suicide among ESRD patients were higher for all age groups relative to the US population, with the exception of 15- to 29-yr-olds, and tended to increase with age. Although crude suicide rates were higher for men, the gender-stratified SIR suggest that the association between ESRD and suicide was more prominent among women (standardized rates were 78% higher for women with ESRD and 47% higher for men). Whites and Asians with ESRD had a two- to almost fourfold increased rate of suicide, respectively. In contrast, the rate of suicide among blacks with ESRD was similar to national rates for blacks. With the exception of the Northeast region, the SIR across geographic regions were similar to the overall SIR for ESRD, indicating that network variation generally conformed to the underlying national geographic variation in suicide rates.

	Discussion

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Previous estimates of the risk for suicide among ESRD patients vary widely. Early data suggesting that suicide rates in ESRD were 100- to 400-fold greater than in the general population did not separate dialysis withdrawal from suicide (1) and may have been biased because of the era and the highly selected patient population. Neu et al. (8) studied dialysis withdrawal and suicide among 1766 dialysis patients. The incidence of suicide in the study population was 0.2%, approximately 15 times greater than the general population rate. More recently, Ojo et al. (14) reported a suicide rate of 15.7 per 1000 patient-years among kidney transplant recipients, 75% higher than the general population. Self-reported kidney disease has also been associated with a threefold increased risk for attempted suicide in the National Comorbidity Survey (15).

Using data on a national cohort of ESRD patients, we demonstrated an increased risk for death from suicide in persons with ESRD, even after accounting for demographic differences between the ESRD population and the general population. These data are consistent with unadjusted data reported for kidney transplant recipients (14) and similar in magnitude to the risk for suicide associated with other chronic or debilitating illnesses, including HIV infection, chronic lung disease, and stroke (15–17). Suicide rates were uniformly increased in ESRD across most major demographic groups, with the exception of blacks and patients who were younger than 30 yr. The presence of ESRD tended to accentuate existing national patterns of suicide according to age, race, and geographic region but not by gender (18). These observations suggest that ESRD acts to exacerbate a preexisting vulnerability or tendency toward suicidal behavior among certain high-risk groups.

In the general population, the elderly, in particular white men who are older than 75 yr, are especially at risk, although the rate of suicide in adolescents and young adults has increased sharply over the last several years (18). We identified several independent predictors of suicide among individuals with ESRD. A number of patient characteristics, including older age, male gender, white race, substance abuse, and geographic region, have been previously identified as predictors of suicide in the general population (18–20). Although we cannot readily explain the observed differences in suicide risk by race among patients who are on dialysis, previous studies in other populations have attributed these differences to cultural factors such as religious beliefs and social support (21). Similarly, some have speculated that geographic variation in suicide risk may reflect social or environmental factors such as gun ownership or regional economic stability (20). The absence of an increased risk for suicide in adolescents with ESRD may be attributable to the improved survival of this subgroup and the higher probability of transplantation for adolescents with ESRD (22).

These data also indicate that suicide differs from dialysis withdrawal with respect to specific risk factors and to a lesser extent by temporal pattern. In contrast to patients who withdrew from dialysis, patients who died from suicide were less burdened with comorbid conditions, malnutrition (defined by low serum albumin), and debility (defined by nonambulatory status). The temporal pattern and risk profile may suggest that suicide is prompted by a failure to cope with the stress of dialysis in the context of maladaptive patient and environmental psychosocial factors, rather than by declining health status.

Several studies have identified mental illness, especially depression, as a risk factor for suicide in many chronic conditions, ranging from migraine headaches to cancer (23,24). However, although higher rates of mental illness are observed among persons with a variety of chronic illnesses, increased rates of suicide are not uniformly observed. For example, diabetes is associated with increased rates of depression (25), yet previous studies have not demonstrated an association between diabetes and suicide risk in adults (26,27). AIDS and chronic lung disease have been associated with an increased risk for suicide independent of mental illness, suggesting that other psychosocial, environmental, or genetic factors may be linked directly with suicide risk in specific clinical settings (15,28). Some studies have suggested that the burden of physical illness is an important risk factor for suicide (15,29). Although physical impairment is relatively common in ESRD, the extent of extrarenal comorbidity did not markedly influence suicide risk in this population.

In 1999, the Surgeon General’s Call to Action to Prevent Suicide (19) addressed the importance of several psychosocial factors as risk factors for suicide. These psychosocial factors include substance abuse and mental illness disorders, unwillingness to seek treatment because of social stigma, barriers to gaining access to mental health treatment, social isolation, stressful life events, and easy access to lethal methods. Indeed, an increased prevalence of many of these psychosocial factors may mediate some of the observed increased risk for suicide among persons with ESRD. Depressive symptoms and clinical depression are extremely common among ESRD patients, especially at dialysis initiation (4,5). In the National Comorbidity Survey, adjustment for coexisting mental illness significantly attenuated the risk for attempted suicide among persons with self-reported kidney disease (15). Substance abuse is also highly prevalent in the ESRD population (5,30). Other psychosocial factors identified in the Surgeon General’s Call to Action, such as stressful life events and easy access to lethal methods, apply to almost all ESRD patients (31). These findings along with the Surgeon General’s Call to Action should help health care professionals who care for persons with ESRD to identify those who are at greatest risk for suicide, i.e., socially isolated older white or Asian men with mental illness or substance abuse, particularly at the start of dialysis or after other stressful life events. Identifying and addressing risk is an important first step for the formulation and testing of effective prevention strategies.

This study has several limitations. First, suicides among persons with ESRD could not be separated from the national data that we used as a referent group. However, because these deaths represent <1% of all national suicides, the magnitude of this problem is negligible. Second, suicide deaths may be underreported as a result of uncertainty and social stigma. Therefore, these data may underestimate the risk for suicide among persons with ESRD. Third, we used administrative data for these analyses; thus, these associations are subject to ascertainment bias, and the RR associated with various conditions may be attenuated as a result of misclassification. For example, persons with less severe substance abuse may not have been captured in these data, which would tend to inflate the RR assigned to substance abuse reported here. Fourth, the USRDS tends to underascertain hospitalization data during the first 90 d after initiation. Thus, we may have underestimated the association between cause-specific hospitalization and death from suicide among patients who died from suicide within 15 mo of dialysis initiation, possibly counterbalancing the effects of misclassification noted above. Fifth, we were unable to assess the direct contribution of mental illness or depressive symptoms, except by the proxy variable mental illness hospitalization. Other important covariates such as marital status and education are not collected in the USRDS database. Finally, we lacked data on the mechanism of suicide deaths in persons with ESRD. Such information may have provided insight as to the provoking factors for suicide death among these individuals and potential mechanisms for prevention.

In summary, persons with ESRD are significantly more likely to commit suicide than persons in the general population. More than 30 yr after the organization and expansion of the ESRD program, despite major technological advances, the rigors of the short- and long-term adjustment to dialysis still exact a heavy toll on patients in terms of mortality and self-destruction. The increased risk for suicide associated with ESRD is seen across most demographic patient subgroups and tends to accentuate national suicide patterns. A number of suicide risk factors are distinct from those of dialysis withdrawal, suggesting that these are divergent outcomes rather than a continuum of a similar underlying process. These data establish a high-risk profile for suicide in ESRD patients for whom it may be advisable to seek counseling and other interventions in an effort to reduce risk. Further studies are urgently needed to understand the causal factors for suicide death and determine the best methods for suicide prevention in these individuals.

	Acknowledgments

 
M.K. was supported by the American Kidney Fund Clinical Scientist in Nephrology Award. G.M.C. was supported by NIH-NIDDK RO1 DK58411 and NIH-NIDDK RO1 DK01005.

The data reported here were supplied by the USRDS. The interpretation and reporting of these data are the responsibility of the authors and in no way should be seen as an official policy or interpretation of the US government.

We dedicate this article to the memory of our patient. We are extremely grateful to the nurses who provided him with excellent care during his brief lifetime.

	Footnotes

 
Published online ahead of print. Publication date available at www.jasn.org.

The data reported here have been supplied by the US Renal Data System (USRDS). The interpretation and reporting of these data are the responsbility of the authors and in no way should be seen as an official policy or interpretation of the US government.

	References

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This Article Abstract Full Text (PDF) All Versions of this Article: ASN.2004070550v1 16/3/774    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Kurella, M. Articles by Chertow, G. M. Search for Related Content PubMed PubMed Citation Articles by Kurella, M. Articles by Chertow, G. M. Related Collections Related Article