Patients with R- IVCD constitute a subgroup of patients with a long Q-LV interval. 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. ![]() Pastore, Gianni Maines, Massimiliano Marcantoni, Lina Zanon, Francesco Noventa, Franco Corbucci, Giorgio Baracca, Enrico Aggio, Silvio Picariello, Claudio Lanza, Daniela Rigatelli, Gianluca Carraro, Mauro Roncon, Loris Barold, S SergeĮstimating left ventricular electrical delay (Q-LV) from a 12-lead ECG may be important in evaluating cardiac resynchronization therapy (CRT). ECG parameters predict left ventricular conduction delay in patients with left ventricular dysfunction.
0 Comments
Leave a Reply. |