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Oximetry-Guided normoxic resuscitation following canine cardiac arrest reduces cerebellar Purkinje neuronal damage.

Abstract：

BACKGROUND:Animal studies indicate that maintaining physiologic O2 levels (normoxia) immediately after restoration of spontaneous circulation (ROSC) from cardiac arrest (CA) results in less hippocampal neuronal death compared to animals ventilated with 100% O2. This study tested the hypothesis that beneficial effects of avoiding hyperoxia following CA are apparent in the cerebellum and therefore not limited to one brain region. METHODS:Adult beagles were anesthetized and mechanically ventilated. Ventricular fibrillation CA was induced by electrical myocardial stimulation and cessation of ventilation. Ten min later, dogs were ventilated with 100% O2 and resuscitated using 3 min of open chest CPR followed by defibrillation. Dogs were ventilated for 1 h with either 100% O2 or with O2 titrated rapidly to maintain hemoglobin O2 saturation at 94-96%. FiO2 was adjusted in both groups between one and 24 h post-arrest to maintain normoxic PaO2 of 80-120 mm Hg. Following 24 h critical care, dogs were euthanized and cerebellum analyzed for histochemical measures of neuronal damage and inflammation. RESULTS AND CONCLUSIONS:Hyperoxic resuscitation increased the number of injured Purkinje cells by 278% and the number of activated microglia/macrophages by 18% compared to normoxic resuscitation. These results indicate that normoxic resuscitation promotes favorable histopathologic outcomes in the cerebellum (in addition to hippocampus) following CA/ROSC. These findings emphasize the importance of avoiding unnecessary hyperoxia following CA/ROSC.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Lee D,Pearson T,Proctor JL,Rosenthal RE,Fiskum G

doi

10.1016/j.resuscitation.2019.04.043

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

23-28

eissn

0300-9572

issn

1873-1570

pii

S0300-9572(19)30159-5

journal_volume

140

pub_type

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