The Kobe journal of medical sciences
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To examine indicators that may assist in the diagnosis of cardiac etiology using simple tests in witnessed cardiac etiology out-of-hospital cardiac arrest cases, which is emphasized in the Utstein Style. ⋯ The indicators which should be noted in simple tests to improve the precision of discrimination of cardiac etiology in out-of-hospital cardiac arrests are ventricular fibrillation in the initial ECG and the qualitative test of cardiac troponin T.