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Critical Care
Published in: Critical Care 1/2018

Open Access 01-12-2018 | Research

Shock subtypes by left ventricular ejection fraction following out-of-hospital cardiac arrest

Authors: Ryan J. Anderson, Sayuri P. Jinadasa, Leeyen Hsu, Tiffany Bita Ghafouri, Sanjeev Tyagi, Jisha Joshua, Ariel Mueller, Daniel Talmor, Rebecca E. Sell, Jeremy R. Beitler

Published in: Critical Care | Issue 1/2018

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Abstract

Background

Post-resuscitation hemodynamic instability following out-of-hospital cardiac arrest (OHCA) may occur from myocardial dysfunction underlying cardiogenic shock and/or inflammation-mediated distributive shock. Distinguishing the predominant shock subtype with widely available clinical metrics may have prognostic and therapeutic value.

Methods

A two-hospital cohort was assembled of patients in shock following OHCA. Left ventricular ejection fraction (LVEF) was assessed via echocardiography or cardiac ventriculography within 1 day post arrest and used to delineate shock physiology. The study evaluated whether higher LVEF, indicating distributive-predominant shock physiology, was associated with neurocognitive outcome (primary endpoint), survival, and duration of multiple organ failures. The study also investigated whether volume resuscitation exhibited a subtype-specific association with outcome.

Results

Of 162 patients with post-resuscitation shock, 48% had normal LVEF (> 40%), consistent with distributive shock physiology. Higher LVEF was associated with less favorable neurocognitive outcome (OR 0.74, 95% CI 0.58–0.94 per 10% increase in LVEF; p = 0.01). Higher LVEF also was associated with worse survival (OR 0.81, 95% CI 0.67–0.97; p = 0.02) and fewer organ failure-free days (β = – 0.67, 95% CI – 1.28 to − 0.06; p = 0.03). Only 51% of patients received a volume challenge of at least 30 ml/kg body weight in the first 6 h post arrest, and the volume received did not differ by LVEF. Greater volume resuscitation in the first 6 h post arrest was associated with favorable neurocognitive outcome (OR 1.59, 95% CI 0.99–2.55 per liter; p = 0.03) and survival (OR 1.44, 95% CI 1.02–2.04; p = 0.02) among patients with normal LVEF but not low LVEF.

Conclusions

In post-resuscitation shock, higher LVEF—indicating distributive shock physiology—was associated with less favorable neurocognitive outcome, fewer days without organ failure, and higher mortality. Greater early volume resuscitation was associated with more favorable neurocognitive outcome and survival in patients with this shock subtype. Additional studies with repeated measures of complementary hemodynamic parameters are warranted to validate the clinical utility for subtyping post-resuscitation shock.
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Metadata
Title
Shock subtypes by left ventricular ejection fraction following out-of-hospital cardiac arrest
Authors
Ryan J. Anderson
Sayuri P. Jinadasa
Leeyen Hsu
Tiffany Bita Ghafouri
Sanjeev Tyagi
Jisha Joshua
Ariel Mueller
Daniel Talmor
Rebecca E. Sell
Jeremy R. Beitler
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2018
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/s13054-018-2078-x

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