Abstract:Objective To verify the values of R-wave peak time(RWPT) inⅡlead, form of aVR lead and ratio of Vi to Vt in the differential diagnosis of wide QRS complex.MethodsBy 12-lead electrocardiograms of 261 patients specifically diagnosed with premature ventricualr contraction and 127 cases with atrial premature beats complicated with intraventricular aberrant conduction, their RWPT inⅡlead, forms of aVR lead and values of Vi/Vt were retrospectively analyzed.The sensitivity, specificity, positive and negative predictive values and accuracy of the above three methods in the differential diagnosis of wide QRS complex were compared.The identification value of the first three steps of aVR lead form method was also compared. Results① In the identification of wide QRS complex, differences between the methods of RWPT inⅡlead and form of aVR lead weren't statistically significant(P>0.05) and the two methods shared the same accuracy, sensitivity, specificity and positive predictive value. Compared with the other two methods, accuracy and sensitivity of Vi/Vt ratio method were lower(P<0.05) while specificity and positive predictive value were higher(P>0.05).② With the application of aVR lead form method, the first and the third step had relatively higher specificity and the third step had relatively higher positive predictive value.ConclusionThe methods of RWPT inⅡlead and form of AVR lead were simple, convenient and accurate in the differential diagnosis of wide QRS complex, owning superiority over Vi/Vt ratio method.
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