VALIDATION STUDIES
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Application of a cardiac arrest score in patients with sudden death and ST segment elevation for triage to angiography and intervention.

The aim of this study was to test a previously validated, prognostic, cardiac arrest score in patients with ST segment elevation acute myocardial infarction (AMI) who suffered a witnessed cardiac arrest and survived to emergency department admission. A consecutive series constructed retrospectively from a sudden death database (n = 22) of patients with ST segment elevation AMI resuscitated from cardiac arrest underwent angiography and angioplasty of the culprit vessel within 24 hours of presentation. A cardiac arrest score was assigned to each case by explicit criteria present on evaluation. Primary outcomes were survival to hospital discharge and the degree of neurological recovery during the hospitalization. All patients underwent successful coronary angioplasty and 77% received adjunctive intraaortic balloon counterpulsation. The overall rate of survival to discharge was 41%. For cardiac arrest scores of 0, 1, 2, and 3, respectively, the rates of neurologic recovery were 0 (0%) of 4 (95% CI 0-53%), 3 (50%) of 6 (95% CI 15-85%), 2 (67%) of 3 (95% CI 13-98%), and 9 (100%) of 9 (95% CI 72-100%), and the rates of survival to discharge were 0 (0%) of 4, (95% CI 0-53%), 2 (33%) of 6 (95% CI 6-74%), 2 (67%) of 3 (95% CI 13-98%), and 9 (100%) of 9 (95% CI 72-100%), P < 0.01 for both outcomes over ascending scores. These results suggest appropriate patients for primary angioplasty after cardiac arrest are those with ST segment elevation AMI and an emergency department cardiac arrest score of > or = 2, thus predicting a 11 (92%) of 12 (95% CI 65-100%) chance of survival to discharge.

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