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ORIGINAL ARTICLE
Year : 2019  |  Volume : 16  |  Issue : 3  |  Page : 238-242

The association of duration of QRS complex in left bundle branch block with left ventricular systolic function


1 Department of Medicine, Hawler Teaching Hospital, Erbil, Kurdistan, Iraq
2 Department of Medicine, College of Medicine, Hawler Medical University, Erbil, Kurdistan, Iraq

Correspondence Address:
Farznda Mustafa Salih Zebari
Department of Medicine, Hawler Teaching Hospital, Erbil, Kurdistan
Iraq
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/MJBL.MJBL_42_19

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Background: Left bundle branch block (LBBB) indicates organic heart disease. It is responsible for a greater degree of asynchrony in the left ventricular (LV) contraction as a result of alteration in LV depolarization sequence. This study aimed to compare the duration of QRS complex in LBBB in relation to LV systolic function by two-dimensional transthoracic echocardiography. Patients and Methods: In this cross-sectional study, 82 patients with LBBB were divided into two groups. Group I defined as QRS <160 ms and Group II defined as QRS ≥160 ms. Then, the relationships between QRS duration and echocardiographic LV ejection fraction (EF) were derived. LV systolic dysfunction defined as EF <40%. Results: Eighty-two patients with (LBBB) had been included in the study, the duration of the QRS complex of 55 patients (67%) was <160 ms (Group I), and it was ≥160 ms (Group II) in 27 patients (33%). More than half (55.6%) of Group II aged ≥70 years compared with 38.2% of Group I (P = 0.001). Group II had high incidence of LV systolic dysfunction (70.4%) compared with 20% in Group I, while 18.2% of Group I had an EF of ≥60% compared with 3.7% in Group II (P < 0.001). Conclusion: The prolongation of QRS duration (≥160 ms) in LBBB is a marker of significant LV systolic dysfunction.


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