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. Conclusion: RBBB and IVCD result in less clinical improvement or worsened survival after CRT. I also had AFIB in 2007-corrected by ablation.
I have congenital heart disease-tetralogy of fallot surgically corrected when I was two. 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. VE Beats SVE Beats VE PAC IVCD Ventricular Ectopy Supraventricular Ectopy If is it any help, I had the test due to rapid heart beat in the middle of the night, tightness in chest and shortness of breath. 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. Estimating left ventricular electrical delay (Q-LV) from a 12-lead ECG may be important in evaluating cardiac resynchronization therapy (CRT).
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