Background: After hypotension, oliguria (urine output less than 0.5 mL/kg/h) was the most common trigger to administer fluid bolus in a multinational practice survey in intensive care. The effect of fluid bolus on cardiovascular variables can be very short-lived among patients in shock suggesting that fluid boluses in the optimization phase are unlikely to improve patient-centered outcomes. Moreover, a growing body of evidence suggests a poor renal response to fluid bolus. Objective: To investigate, whether fluid bolus - as a standard of care - improves urine output in oliguric patients compared to a non-interventional follow-up approach without fluid bolus. Design: Investigator-initiated, open, randomized, controlled study Interventions: 1. Intervention group - follow-up without intervention 2. Control group - fluid bolus (500mL of balanced crystalloid over 30 minutes) Randomization: 1:1 stratified according to the site, presence of acute kidney injury, and sepsis Trial size: 130 patients randomized in 2 ICUs
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Change in individual mean cumulative urine output (mL/kg/h)
Timeframe: 2 hours after randomization compared to urine output 2 hours preceding randomization