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12.01.2021 | Original Article

Hemodynamic disturbances and oliguria during continuous kidney replacement therapy in critically ill children

Zeitschrift:
Pediatric Nephrology
Autoren:
Sarah N. Fernández Lafever, Jorge López, Rafael González, María J. Solana, Javier Urbano, Jesús López-Herce, Laura Butragueño, María J. Santiago
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Abstract

Background

About 1.5% of patients admitted to the Pediatric Intensive Care Unit (PICU) will require continuous kidney replacement therapy (CKRT)/renal replacement therapy (CRRT). Mortality of these patients ranges from 30 to 60%. CKRT-related hypotension (CKRT-RHI) can occur in 19–45% of patients. Oliguria after onset of CKRT is also common, but to date has not been addressed directly in the scientific literature.

Methods

A prospective observational study was conducted to define factors involved in the hemodynamic changes that take place during the first hours of CKRT, and their relationship with urinary output.

Results

Twenty-five patients who were admitted to a single-center PICU requiring CKRT between January 1, 2014, and December 31, 2018, were included, of whom 56.3% developed CKRT-RHI. This drop in blood pressure was transient and rapidly restored to baseline, and significantly improved after the third hour of CKRT, as core temperature and heart rate decreased. Urine output significantly decreased after starting CKRT, and 72% of patients were oliguric after 6 h of therapy. Duration of CKRT was significantly longer in patients presenting with oliguria than in non-oliguric patients (28.7 vs. 7.9 days, p = 0.013).

Conclusions

The initiation of CKRT caused hemodynamic instability immediately after initial connection in most patients, but had a beneficial effect on the patient’s hemodynamic status after 3 h of therapy, presumably owing to decreases in body temperature and heart rate. Urine output significantly decreased in all patients and was not related to negative fluid balance, patient’s hemodynamic status, CKRT settings, or kidney function parameters.

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