Pulmonary arterial hypertension is a malignant pulmonary vascular disease primarily caused by increased pulmonary vascular resistance, which leads to right ventricular hypertrophy, fibrosis, right heart failure and death. Fragmented QRS (fQRS) indicates non-homogeneous ventricular activity caused by myocardial fibrosis. This study aims to investigate the importance of fQRS in patients with pulmonary hypertension (PH) and to determine the role of the presence of fQRS in indicating the severity of the disease. The study included 94 (85 patient group 1 PH and 9 patient group 4 PH) patients. The patients were divided into two groups according to the presence of fQRS in their surface electrocardiography (ECG). The patients' laboratory, transthoracic echocardiography, and right heart catheterization parameters were compared between the two groups . FQRS was detected in 55 (58%) patients, and the mean age of these patients was 51.8±18.0, and 29.1% of them were male. Systolic pulmonary arterial pressure (PAP) measured by transthoracic echocardiography (p
Key words: Pulmonary hypertension, electrocardiography, fragmented QRS, Pulmonary vascular resistance
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