Epidemiology and Natural History of Acute Renal Failure in the ICU
Section snippets
Acute renal failure in critically ill patients: prevalence and cause
A different situation is found in the special population of critically ill patients. Prevalences reported for ARF in ICUs generally are greater and range from 3% to 25%, depending on the criteria applied [4], [12], [13], [14], [15], [16], [17]. A study that investigated the prevalence of ARF in 13 tertiary care hospitals in Madrid, Spain, found that 34% of the 748 episodes of ARF occurred in ICU settings. Ischemic ATN seemed to be the predominant reason for ARF in this group (78%), followed by
Risk adjustment in patients who have acute renal failure
Although general severity-of-illness scores, such as the Simplified Acute Physiology Score (SAPS) II [26], were developed for use in assessing severity of illness in a mixed ICU population, they have been applied often to specific subgroups, such as patients who have ARF [17], [27], [28], [29], [30], [31], [32], [33]. These systems have been reported as risk-stratifying tools (eg, for clinical studies) and are said to aid in the detection of futile care [34]. Only a few studies have tried to
Outcome of critically ill patients who have acute renal failure
Reported ICU and hospital mortality vary between 20% and 80% (Table 1) [9], [13], [18], [25], [49]. There is some debate about whether an attributable excess mortality also exists in mild ARF. Mild ARF, defined as less than a 50% increase in baseline serum creatinine values in patients who have normal or slightly impaired baseline renal function, is not associated with significant long-term sequelae, as shown in an observational study of 916 patients [50]. Although that study suggested that
Long-term outcome in ICU survivors
Although in-hospital survival of critically ill patients is poor and rarely exceeds 30%, long-term survival of patients who leave the hospital is not as bad. After discharge from the hospital, approximately 10% to 30% of patients need further dialysis treatment [28], [29], [49]. In a German study that investigated 979 patients in the ICU [57], the 6-month survival of patients who survived to hospital discharge was approximately 69%; 5-year survival was 50%. Only 10% required chronic dialysis;
Summary
ARF in the ICU is associated with an extremely high mortality. Accurate epidemiologic assessment of ARF, however, remains a problem; as long as there is neither a generally accepted definition of ARF, nor definitions for end points to measure, assessments likely will vary according to local criteria [59].
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