Patients with R-IVCD constitute a subgroup of patients with a long Q-LV interval.Ĭardiac resynchronization therapy Heart failure Left bundle branch block Left ventricular electrical delay Nonspecific intraventricular conduction delay Right bundle branch block.Ĭopyright © 2016 Heart Rhythm Society. 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. ECG Examples of Right Bundle Branch Block Example 1 RBBB with LAFB. Such a type of IVCD is therefore defined as transient. The right bundle branch is supplied by LAD perforators in most patient populations and thus occlusion of this branch may manifest as a new RBBB +/- LAFB. better be classified as IVCD with LAD (intraventricular conduction delay. At times they persist for a variable period, generally secondary to acute affections and independent of cardiac rate, and then disappear. of RBBB (right bundle branch block) with LAHB (left anterior hemiblock). 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). Intraventricular conduction disturbances (IVCD) in most cases are permanent. 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).
0 Comments
Leave a Reply. |