Mid-QRS notching in lateral leads strongly predicts a longer Q-LV interval in L-IVCD patients. Patients with LBBB have a very prolonged Q-LV interval. The R-IVCD group presented an unexpectedly longer Q-LV interval (127.0 ± 12.5 ms 13/15 patients had Q-LV >110 ms). Isolated mid-QRS notching/slurring predicted Q-LV interval >110 ms in 68% of patients. Patients with LBBB presented a long Q-LV interval (147.7 ± 14.6 ms, all exceeding cutoff value of 110 ms), whereas RBBB patients presented a very short Q-LV interval (75.2 ± 16.3 ms, all 150 ms and intrinsicoid deflection >60 ms. The Q-LV interval in the different groups and the relationship between ECG parameters and the maximum Q-LV interval were analyzed. The IVCD group was further subdivided into 81 patients with left (L)-IVCD and 15 patients with right (R)-IVCD (resembling RBBB, but without S wave in leads I and aVL). One hundred ninety-two consecutive patients undergoing CRT implantation were divided electrocardiographically into 3 groups: left bundle branch block (LBBB), right bundle branch block (RBBB), and nonspecific intraventricular conduction delay (IVCD). The purpose of this study was to assess the impact of Q-LV interval on ECG configuration. IVCC quantifies the effective working time for a dynamic viable cell concentration within a given frame of time, analogous to the calculation of man-hours. The Q-LV interval in the different groups and the relationship between ECG parameters and the maximum Q-LV interval were analyzed. The Integral (area under the curve) of Viable Cell Density (IVCD) or Concentration (IVCC) is an essential calculated metric in cell culture operations. Estimating left ventricular electrical delay (Q-LV) from a 12-lead ECG may be important in evaluating cardiac resynchronization therapy (CRT). The IVCD group was further subdivided into 81 patients with left (L)-IVCD and 15 patients with right (R)-IVCD (resembling RBBB, but without S wave in leads I and aVL).
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