Atrial fibrillation (AF) is an abnormal cardiac rhythm with rapid and irregular electrical activity. Atrial fibrillation can be caused by anatomical and/or non-anatomical abnormalities of the cardiac. One of the non-anatomical causes of atrial fibrillation is hypertension. Prolonged and uncontrolled hypertension can alter myocardial and blood vessel structure. It also can affect cardiac conduction system which in turn will affect the cardiac structure. One of the structural alterations that can cause AF is left ventricular hypertrophy (LVH). This study was an observational analytic study with cross-sectional observations. Samples were taken from 60 medical records of patients with AF. The data was analyzed by descriptive method followed by the chi-square test. Most patients' age was over 50 years of age (88%). Patients that had hypertension were 42 patients (70%). Eighteen (30%) had LVH with 17 patients (94.4%) had hypertension with LVH. The chi-square test obtained in this study was P = 0.007 value (P <0.05). There was a significant relationship between hypertension and left ventricular hypertrophy in atrial fibrillation patients.
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