Table 1.

Baseline characteristics

Characteristic	Median (min-max) or number (%)
Age (years)	65 (18–91)
Gender (male)	63 (66%)
Intensive care unit	21 (22%)
Concurrent use of antiarrhythmic drugs	4 (4%)
Known prior cardiovascular disease
– Atrial fibrillation	13 (14%)
– Coronary artery disease	11 (12%)
– Congestive heart failure	9 (9%)
– Other	9 (9%)