A multicenter retrospective cohort analysis of therapeutic hypothermia in acute liver failure
© Karvellas et al.; licensee BioMed Central Ltd. 2014
Published: 17 March 2014
Cerebral edema is a severe and life-threatening complication in acute liver failure (ALF). Concerns exist that therapeutic hypothermia (TH) may increase the risk of infection, worsen coagulopathy and inhibit hepatic regeneration. We therefore reviewed the experience in use of TH in participating US Acute Liver Failure Study Group (ALFSG) centers. The aims were to determine utilization of TH in ALF patients at high risk for cerebral edema (grade III or IV hepatic encephalopathy (HE)) and to determine its effect on survival and complication rates.
A retrospective cohort study of all ALF patients enrolled in the US ALFSG registry between January 1998 and September 2013 with grade III or IV HE. TH using an external cooling device was used in 97 (8%) patients while in 1,135 (92%) patients it was not (controls).
TH ALF patients were younger (36 vs. 40, P = 0.03) and had acetaminophen etiology (63 vs. 47%, P = 0.04). Admission MELD (32 vs. 34) and lactate (5.4 vs. 5.0 mmol/l, P > 0.2 for all) were similar. More TH ALF patients received renal replacement therapy (63 vs. 40%), vasopressors (61 vs. 43%) and ICP monitoring (40 vs. 22%, P < 0.0002 for all). Overall (38% vs. 40%, P = 0.7) and 21-day transplant survival (45 vs. 49%, P = 0.5) were similar. There were no differences in bleeding (12% vs. 12%) or bloodstream infections (17 vs. 18%, P > 0.7 for both). More TH ALF patients had arrhythmias (38 vs. 27%, P = 0.03). There were no differences in listing (43 vs. 40%, P = 0.5) or receipt of transplant (18 vs. 25%, P = 0.1). After controlling for MELD, requirement for organ support on multivariable analysis, hypothermia was not independently associated with 21-day spontaneous survival (P = 0.93) while MELD (P < 0.0001) and vasopressors (P < 0.02) were.
TH was not associated with increased bleeding/infection rates nor differences in survival in ALF patients with high-grade HE. ICP monitoring was not universally used in TH ALF patients (~40%). There is a need for a prospective trial to clarify the use of TH in patients with ALF.
Supported in part by a U-01 58369-014 from NIDDK to the US ALFSG.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.