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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
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©2013 UpToDate ® Print Email Ambulatory ECG monitoring findings in 157 cases of sudden cardiac death Etiology Percent Ventricular tachyarrhythmia 83.4 VT/VF 62.4 Primary VF 8.3 Torsade polymorphic VT 12.7 Bradycardia 16.5 Electrocardiographicabnormalities Finding or frequency Increase in VPBs 75 to 90 percent Increase in complex VPBs 70 percent R on T VPBs 15 percent Monomorphic VT duration before VF 167 sec Polymorphic VT duration before VF 34 sec Heart rate before VT or VF Accelerated VT cycle length before VF Accelerated Ischemic ST segment changes 13 percent QTc Unchanged VT: ventricular tachycardia; VF: ventricular fibrillation; VPB: ventricular premature beat. Adapted from: Bayes de Luna A, Coumel P, Leclerc JF. Am Heart J 1989; 117:151.