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Intra-arrest rapid head cooling improves postresuscitation myocardial function in comparison with delayed
Min-Shan Tsai1, Denise Barbut, Hao Wang
1Weil Institute of Critical Care Medicine, Rancho Mirage, CA, USA.
Critical Care Medicine
|May 8, 2010
Summary
Intra-arrest head cooling significantly improved resuscitation outcomes and myocardial function compared to delayed surface cooling and controls in a pig model. Early head cooling during cardiopulmonary resuscitation offers the greatest survival benefits.
Area of Science:
- Cardiology
- Emergency Medicine
- Therapeutic Hypothermia
Background:
- Post-cardiac arrest myocardial dysfunction is a major cause of mortality.
- Therapeutic hypothermia is used to mitigate ischemia-reperfusion injury.
- Optimal timing and method for therapeutic hypothermia remain under investigation.
Purpose of the Study:
- To compare resuscitation outcomes and myocardial function.
- To evaluate intra-arrest head cooling versus delayed surface cooling.
- To assess effects against uncooled controls in a porcine model of cardiac arrest.
Main Methods:
- Prospective animal study involving 24 male domestic pigs.
- Ventricular fibrillation induced and untreated for 10 minutes.
- Three groups: intra-arrest head cooling, postresuscitation surface cooling, and controls.
Main Results:
- Return of spontaneous circulation rates were high across all groups (8/8 head-cooled, 7/8 surface-cooled, 7/8 controls).
- Head-cooled animals showed significantly better myocardial function and 96-hour survival (8/8) compared to surface-cooled (6/8) and controls (2/8).
Conclusions:
- Both intra-arrest head cooling and delayed surface cooling improved postresuscitation myocardial function.
- Initiating head cooling concurrently with cardiopulmonary resuscitation yielded the most significant survival benefits.
