Value of E~ec~~Qcard~~~~a Leads in the Diagnosis of
نویسنده
چکیده
To eanpare the modMod precordiat leads MCI., and AlCL, with the conventioosl prfxordial leads V, and V, and assess the diignastic necuracy of selected leads for continuous bedside electrocardiographic (ECGI monitoring. 121 wide QRS complex tachycardiis were recorded From 92 palienls during cardiac electrophyG&gic rNdy. As awzNined from intracardiac recordings, 86 Nchycardias were venlricular and 35 were supraventriculnr with aberranl conduction. Early or late peaking of the predominant QRS deflection in lead MCI., or V, proved valuable in diagnosing wide complex iachycardia. An interval of 550 ms from tine onset of the QRS complex to the predominant peak (or nadir) indicated supraventricular tachycardia; an interwl oC 270 ms indicated ventricndar tachyeardia. The QRS compleaes in
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