Patterns of atrial fibrillation at a regional hospital in Saudi Arabia.

: The objective of this retrospective study was to report on the clinical presentation, etiology, and laboratory tests of both chronic and acute atrial fibrillation (AF) admitted to the cardiology unit of a teaching hospital in southern Saudi Arabia. We studied 219 records; 132 (60.3%) and 87 (39.7%) had documented chronic AF (group 1), and acute AF (group 2) respectively. The mean age (SD) was significantly higher in group 1 (64.6 [SD 19.4] vs 52.9 [SD 15.6]) (P<0.001). Palpitation, dizziness and syncope were the most frequent symptoms in acute AF, while dyspnea was the most common presentation in the chronic type. On the other hand, heart failure and embolic complications were reported significantly in group 1, but the frequency of acute respiratory problems and acute myocardial infarction was similar in both groups. The most common causes of both types of AF were rheumatic valvular diseases (26%), IHD (24.2%), hypertension (23.7%), and lung diseases (13.2%); however, in 28 patients (12.8%) no cause was detected. The echocardiography findings of chamber dilatation, valve lesions, and depressed left ventricular function were significantly frequent in group 1 (P<0.01). Although rheumatic valvular diseases are still common in Saudi Arabia, ischemic heart disease and hypertension are emerging as important causes of AF in this developing nation, and therefore require prevention and control.