Dialysis keeps people with kidney failure alive, but it does not eliminate the risk of death, and mortality among dialysis patients remains high compared with the general population. Average life expectancy on conventional hemodialysis has been reported at less than three years, a figure that has changed little over two decades of observation.1PubMed Central. Consequences of frequent hemodialysis: comparison to conventional hemodialysis and transplantation That statistic covers a wide range of individual outcomes shaped by age, diabetes status, vascular access, dialysis schedule, and other medical conditions. Understanding what actually causes death on dialysis, and what modifiable factors make a difference, gives patients and families the clearest picture of what to expect and what decisions matter most.
Leading Causes of Death on Dialysis
The single largest cause of death among hemodialysis patients is sudden cardiac death, which accounts for roughly a quarter to a third of all deaths depending on the country. In the United States, sudden cardiac death makes up about a third of hemodialysis deaths, while it is somewhat lower in Japan, Australia, New Zealand, and Canada.2PubMed Central. Sudden Cardiac Death Among Hemodialysis Patients Sudden cardiac death in this population accounts for up to 60 to 75 percent of all cardiovascular deaths, and it clusters around specific times in the treatment schedule, particularly after the longest gap between sessions and during the first session after that gap.3PubMed. Sudden cardiac death in chronic kidney disease and dialysis: From descriptive epidemiology to mechanism-driven prevention The fluid and electrolyte shifts that happen between and during treatments create conditions that can destabilize heart rhythm, and the cumulative cardiovascular damage from years of kidney disease adds structural vulnerability.
Infection is the second major killer. Dialysis patients face a vastly elevated risk of dying from sepsis compared with the general population. One large analysis found that annual sepsis-related mortality was roughly 100 to 300 times higher in dialysis patients than in the general public, and even after adjusting for age and using conservative assumptions, the rate remained about 50 times higher.4PubMed. Mortality caused by sepsis in patients with end-stage renal disease compared with the general population The most common specific causes of infection-related death among dialysis patients are septicemia and lung infections, which together account for the majority of cases, with peritonitis a distant third.5Kidney Medicine. Time Trends and Causes of Infection-Related Mortality Among Patients Starting Dialysis in Finland: A Nationwide Cohort Study Repeated access to the bloodstream through catheters and weakened immune function both play a role.
The third major cause of death is voluntary withdrawal from dialysis treatment. In an early landmark study, dialysis was discontinued in about 9 percent of patients being treated, and those withdrawals accounted for 22 percent of all deaths.6PubMed. Stopping long-term dialysis. An empirical study of withdrawal of life-supporting treatment Withdrawal is discussed in more detail below, but it is worth recognizing here that stopping treatment is not rare; it is one of the most common ways dialysis patients die, particularly among those who are older or who develop additional serious illnesses.
Why the First Few Months Are the Most Dangerous
Death rates on dialysis are not evenly spread over time. The risk is highest in the first months after starting treatment. A study of more than 18,000 new hemodialysis patients found that mortality was nearly twice what would be expected during the first and second months, then gradually fell over about seven months before leveling off.7PubMed Central. Patterns and Predictors of Early Mortality in Incident Hemodialysis Patients: New Insights International registry data confirm this pattern across multiple countries, with elevated mortality extending through roughly the first 120 days of dialysis before settling into a more stable rate.8Kidney International. International differences in early mortality on dialysis: a comparison of registry data
Several things converge to make the early period so risky. Many patients begin dialysis late, often in an emergency rather than with months of planned preparation. Their bodies are adapting to a completely new physiological rhythm while already carrying a heavy burden of cardiovascular disease, malnutrition, and fluid overload. Vascular access may not be mature yet, forcing the use of temporary catheters that carry higher infection and mortality risk. If you or a family member is about to start dialysis, this is a period when close medical monitoring matters most.
What Can Go Wrong During a Session
Dying during an actual dialysis session is uncommon, but the treatment itself creates real physiological stress. The most frequent acute complication is intradialytic hypotension, a rapid drop in blood pressure caused by fluid removal outpacing the body’s ability to compensate. This can cause symptoms ranging from nausea and cramping to loss of consciousness. Over time, repeated episodes lead to cumulative organ damage to the heart, brain, and gut.9PubMed Central. Prevention of Intradialytic Hypotension in Hemodialysis Patients: Current Challenges and Future Prospects
Electrolyte imbalances are another concern. Patients on maintenance dialysis have a high risk of developing dangerously elevated potassium levels between treatments. Potassium plays a central role in heart rhythm, and uncorrected spikes can trigger cardiac arrest, which is one link between electrolyte shifts and the sudden cardiac deaths discussed above.10PubMed Central. Current Management of Hyperkalemia in Patients on Dialysis Modern dialysis machines include safety systems such as air detectors to prevent air embolism and blood-leak detectors, making catastrophic equipment-related events rare in supervised clinical settings.11EDTNA/ERCA. 9.0 Safety and Risk Management The danger is less about equipment failure and more about the cumulative physiological toll of the treatment itself.
How Vascular Access Type Shapes Survival
The way blood is accessed for hemodialysis has a measurable effect on how long a person lives. An arteriovenous fistula, where a surgeon connects an artery and vein to create a durable access point, is associated with the lowest mortality. In one large cohort, fistula patients had mortality rates of about 9 percent at six months, 17 percent at one year, and 31 percent at two years. Patients who started with a catheter had far worse numbers: 32 percent at six months, 46 percent at one year, and 62 percent at two years.12PubMed Central. The Survival Benefit of “Fistula First, Catheter Last” in Hemodialysis Is Primarily Due to Patient Factors A more recent cohort study found that tunneled catheters were associated with about 2.8 times the mortality risk of a fistula, while temporary non-tunneled catheters carried roughly 5 times the risk.13PubMed Central. Vascular Access Type and Survival Outcomes in Hemodialysis Patients: A Seven-Year Cohort Study
The picture is more complicated than it first looks, though. A major finding from the earlier study was that patients who had a catheter only because their fistula placement failed also had significantly better survival than the catheter-only group, even though both groups were dialyzing through catheters. That suggests at least two thirds of the fistula survival advantage comes from patient-level health factors rather than the access device itself. Healthier patients are more likely to successfully receive a fistula. Still, catheters carry real infection risks that directly increase mortality, so the “fistula first, catheter last” guideline in nephrology rests on both selection and genuine hazard reduction.
Overall five-year mortality for patients undergoing hemodialysis access creation was about 63 percent, with fistulas at 61 percent and grafts at 69 percent. The strongest individual predictors of death within five years were being unable to walk independently and having congestive heart failure or chronic lung disease.14Journal of Vascular Surgery. Long-term survival and associated risk factors in patients undergoing hemodialysis access creation
Hemodialysis Versus Peritoneal Dialysis
Whether one type of dialysis is safer than the other depends on who you are and how long you have been on treatment. In the first couple of years, peritoneal dialysis may actually carry a survival advantage. One study using careful statistical controls found that peritoneal dialysis was associated with about 48 percent lower mortality than hemodialysis over the first two years.15PubMed Central. Comparing mortality of peritoneal and hemodialysis patients in the first 2 years of dialysis therapy: a marginal structural model analysis However, over longer follow-up the balance shifts. A propensity-matched study found no significant difference in mortality between the two for the first four years, but by five and ten years, hemodialysis patients had lower death rates.16PubMed Central. Long-term mortality in patients with end-stage renal disease undergoing hemodialysis and peritoneal dialysis: a propensity score matching retrospective study
For older patients specifically, a meta-analysis pooling data across multiple studies found that peritoneal dialysis was associated with about 17 percent higher mortality than hemodialysis overall. The gap was wider for patients with diabetes or multiple comorbidities and for those on dialysis longer than three years.17PubMed Central. Mortality of Peritoneal Dialysis versus Hemodialysis in Older Adults: An Updated Systematic Review and Meta-Analysis This does not mean peritoneal dialysis is categorically worse; for patients who value independence, fewer trips to a clinic, and a gentler treatment schedule, the early survival equivalence and quality-of-life benefits may outweigh long-term mortality differences.
Age, Diabetes, and Nutrition as Mortality Drivers
Age is the single strongest predictor of survival on dialysis. Data from the U.S. Medicare program showed that one-year survival ranged from about 95 percent for patients starting dialysis between ages 15 and 24 to about 53 percent for patients over 85.18PubMed. Mortality rates among dialysis patients in Medicare’s End-Stage Renal Disease Program Every decade of age at dialysis initiation trims life expectancy substantially.
Diabetes roughly doubles the risk at every age tier. A study modeling mortality in diabetic dialysis patients illustrated how quickly risk compounds: a 60-year-old diabetic patient with prior heart attack and moderate functional ability had a predicted one-year mortality risk of about 27 percent, but the same patient at age 70 with lower functional status had a predicted risk of about 68 percent.19PLOS ONE. Predicting Mortality in Patients with Diabetes Starting Dialysis Beyond diabetes itself, the severity of vascular disease and cirrhosis independently worsen prognosis.20PubMed. Prognosis of diabetic patients on dialysis: analysis of Lombardy Registry data
Nutritional status is an underappreciated survival factor. A protein-energy wasting score that combines simple nutritional measures was found to clearly separate survival groups among hemodialysis patients, with one-year survival ranging from 99 percent for those in the best nutritional category down to 69 percent for those in the worst. Importantly, improvements in nutritional score over time also predicted better survival, suggesting this is not just a marker but a modifiable risk factor.21PubMed. A simple protein-energy wasting score predicts survival in maintenance hemodialysis patients Depression also independently predicts mortality, with severely depressed patients dying sooner, and nonadherence to medications further increasing the risk.22PubMed Central. Depression and nonadherence predict mortality in hemodialysis treated end-stage renal disease patients
What Happens When Someone Chooses to Stop Dialysis
Stopping dialysis is a decision that some patients make deliberately, and it leads to death within days. In one large dataset of nearly 2,000 patients who discontinued dialysis, mean survival after hospice enrollment was about 7 days.23PubMed Central. Survival after dialysis discontinuation and hospice enrollment for ESRD A more recent study found that median survival from last dialysis session to death was about 6 days for hemodialysis patients and 4 days for peritoneal dialysis patients, with no significant difference between the two.24Kidney International Reports. Prognostication After Dialysis Withdrawal Patients who stopped for psychosocial reasons rather than worsening medical condition tended to survive somewhat longer after their last session.
The experience of dying after stopping dialysis is not necessarily one of suffering. A prospective study that followed 79 patients through death found that suffering was not evident in 81 percent of cases. Pain was present in about half of patients during the last day of life, but was judged severe in only 5 percent. Families or staff were present at the time of death in 71 percent of cases, and the majority of deaths were rated as “good” or “very good” on a structured quality-of-dying measure.25Archives of Internal Medicine. Dying Well After Discontinuing the Life-Support Treatment of Dialysis Pain and agitation were the most common end-of-life symptoms, but with appropriate palliative care they were generally manageable.26PubMed. Dialysis discontinuation and palliative care
Despite the relatively well-managed dying process, palliative care utilization among dialysis patients remains low. One study found that only about a third of patients who withdrew from dialysis received any palliative care services.27PubMed Central. End of Life, Withdrawal, and Palliative Care Utilization among Patients Receiving Maintenance Hemodialysis Therapy Given how common withdrawal is as a mode of death, this represents a gap that advocacy groups and nephrology organizations have been pushing to close.
How Kidney Transplant Changes the Picture
For patients who are eligible, a kidney transplant substantially extends life compared with staying on dialysis. A study of transplant-eligible patients found that transplantation was associated with meaningful survival gains across all ages over a 10-year follow-up. The benefit was largest for patients around age 60, where transplant was associated with roughly 3 extra years of life compared with remaining on the waiting list and continuing dialysis.28JAMA Network Open. Survival Benefit of First Single-Organ Deceased Donor Kidney Transplantation Compared With Long-term Dialysis Across Ages in Transplant-Eligible Patients With Kidney Failure
Even among people over 70, transplant appears to pay off after an initial period of higher risk. One matched-pair study of elderly transplant recipients found that five-year survival was 80 percent for transplant recipients versus 53 percent for those who stayed on dialysis. The catch was a higher mortality risk in the first nine months post-transplant, after which a progressive survival advantage emerged.29PubMed. Survival after kidney transplantation compared with ongoing dialysis for people over 70 years of age: A matched-pair analysis A key insight from recent transplant research is that high-risk patients, defined by older age and more comorbidities, actually derive the greatest relative benefit from transplantation compared with staying on dialysis, even though their absolute survival remains shorter than that of younger, healthier recipients.30Scientific Reports. Life expectancy after kidney transplantation in a population-based retrospective cohort This argues against using age or comorbidity as reasons to deny transplant evaluation.
More Frequent and Home-Based Dialysis
The standard hemodialysis schedule of three sessions per week at a clinic is not the only option, and evidence suggests that doing dialysis more often or at home can improve survival. A matched comparison of daily home hemodialysis patients and standard thrice-weekly in-center patients found that daily home treatment was associated with about a 13 percent lower risk of death.31PubMed Central. Survival in daily home hemodialysis and matched thrice-weekly in-center hemodialysis patients The American Heart Association has noted that home dialysis, whether hemodialysis or peritoneal, may improve cardiovascular risk factors and outcomes compared with conventional in-center hemodialysis by providing a more physiological treatment pattern.32PubMed. Cardiovascular Effects of Home Dialysis Therapies: A Scientific Statement From the American Heart Association
Increasing dialysis frequency to five or six times a week, whether through short daily sessions or overnight nocturnal sessions, helps with fluid management, blood pressure control, and left ventricular mass regression, all factors tied to the cardiovascular mortality that dominates dialysis deaths.33Journal of Nephrology. The impact of short daily and nocturnal hemodialysis on quality of life, cardiovascular risk and survival Despite these benefits, daily home dialysis remains underutilized in most countries. Barriers include training requirements, patient confidence in managing equipment at home, and the infrastructure needed for clinical support outside office hours.
How Income and Neighborhood Affect Survival on Dialysis
Socioeconomic status has measurable effects on mortality among dialysis patients, which means the risk of dying is not purely medical. A meta-analysis found that lower income was associated with higher death rates in both hemodialysis and peritoneal dialysis patients. The effect was more pronounced in peritoneal dialysis, where lower income, education, and occupational status all independently predicted higher mortality.34PubMed. Socioeconomic status and mortality among dialysis patients: a systematic review and meta-analysis A more detailed mediation analysis found that patients from lower socioeconomic backgrounds had a 17 percent higher overall death rate, with geographic remoteness, cardiovascular disease burden, and diabetes each mediating part of that effect.35PubMed Central. Socioeconomic Disadvantage, All-Cause and Cause-Specific Mortality in Patients Treated With Maintenance Dialysis: A Mediation Analysis of Geographical Inequity and Multimorbidity
Race and neighborhood interact as well. Among young dialysis patients in the United States, Black patients living in low socioeconomic status neighborhoods had greater mortality than White patients after adjusting for clinical characteristics and access to care. That racial gap shrank significantly for patients living in higher-income neighborhoods, pointing to structural factors like clinic proximity, transportation, and community resources rather than biology alone.36PubMed Central. Neighborhood socioeconomic status, race, and mortality in young adult dialysis patients
When Dialysis May Not Be the Best Choice
For older adults with significant frailty or multiple other serious illnesses, the survival benefit of dialysis over conservative kidney management can be surprisingly small. A Cochrane review comparing dialysis to conservative management in older people found that dialysis was associated with lower overall mortality, but the evidence was rated as very low certainty, and the quality-of-life measures were essentially indistinguishable between the two groups.37PubMed Central. Conservative kidney management versus dialysis for stage 5 chronic kidney disease in older people A narrative review concluded that dialysis primarily extended survival in younger and less comorbid patients, while conservative management provided comparable or even better quality of life and fewer hospitalizations in frailer individuals.38PubMed Central. Dialysis versus conservative kidney management in older adults: why one size does not fit all
A recent study that stratified outcomes by suitability for dialysis sharpened the picture. Patients who chose dialysis had a one-year survival rate of about 89 percent and a median survival of 53 months. Among those who chose conservative management but were considered suitable for dialysis, one-year survival was about 78 percent and median survival was 32 months. For those considered less suitable for dialysis who chose conservative care, one-year survival was about 62 percent and median survival was 18 months.39Kidney Medicine. Survival of Older Adults Choosing Dialysis or Conservative Kidney Management, Stratified by Suitability for Dialysis The gap between dialysis and conservative management is real, but for someone who is very elderly and frail, the extra months may come with a heavy burden of clinic visits, hospitalizations, and treatment side effects. This is increasingly recognized as a legitimate conversation to have with a nephrologist rather than an automatic decision.