Naeem-ur Rehman Mir, Irfan Majeed, Abdul Sattar, Muhammad Azhar.
Frequency of Atrial Fibrillation according to QRS Duration in Patients with Left Ventricular Systolic Dysfunction.
J Cardiovascular Dis Jan ;13(2):50-4.

OBJECTIVE: To see the frequency of atrial fibrillation in patients with LV systolic dysfunction according to various QRS duration groups. MATERIAL AND METHODS:This observational study was carried out at cardiology department, Punjab Institute of Cardiology, Lahore from 16-02-2012 to 15-08-2012 (six months). 400 cases of LV systolic dysfunction were studied. QRS duration was measured on 12-lead ECG. Patients with QRS duration <120 ms were categorized as narrow complex (group 1), and patients with QRS duration of 120 to 150 ms and more than 150 ms as intermediate and wide complex groups (group 2 and 3 respectively). ECG was assessed for the presence of atrial fibrillation in patients with LV dysfunction for all QRS groups. RESULTS:400 patients of LV dysfunction (EF<45%) were selected and studied as per inclusion and exclusion criteria. The age was 56.5±11.6 of the studied population. The study population consisted of male (72.3%) and female (27.7%). The left atrial diameter was 40.3±6.08 mm and LV ejection fraction 31.8±6.6 %. Most of the patients with having coronary artery disases (87.75%) followed by Non-ischemic cardiomyopathy (around 9%) and valvular heart disease (3.5%). Atrial fibrillation was seen in 15.75%. In group 3 atrial fibrillation was seen in 60.9% patients, while 18.9 and 6.04 % in group 2 and 1 respectively. Atrial fibrillation was seen more commonly in patients with severe systolic dysfunction and wide QRS duration. CONCLUSION:Atrial fibrillation is more common with LV systolic dysfuncation and wide QRS duration. These groups of people need more attention for preventive strategy. Key Words:LV dysfunction, atrial fibrillation, QRS duration

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