Assertion: fibrillation's condition | /r/Causes | atrial dilation
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text: As January and colleagues note in the current AHA/ACC/HRS guideline, structural abnormalities such as fibrosis and hypertrophy “occur most commonly in the setting of underlying heart disease associated with hypertension, coronary artery disease, valvular heart disease, cardiomyopathies, and [heart failure],” and these conditions “tend to increase [left atrial] pressure, cause atrial dilation, and alter wall stress.”2 Comorbidities such as obesity, diabetes mellitus, and hyperthyroidism; alcohol or drug use; and systemic influences such as excessive autonomic nervous system stimulation (causing catecholamine imbalances) and excessive renin–