Table 1.

Clinical Characteristics

	Typical (n=39)	Atypical (n=27)	p
Age/years	59 ± 14	58 ± 15	NS
AFL CL/ms	247 ± 31	284 ± 48	< 0.01
Ventricular CL/ms	618 ± 201	655 ± 220	NS
Atrio:Ventricular ratio	2.5 ± 0.8	2.3 ± 0.7	NS
LA diameter/mm	39 ± 9	44 ± 7	NS
LVEF/%	58 ± 17	55 ± 12	NS
NYHA Class ≥ II	0	3	NS
Prior Cardiac Surgery	6	12	< 0.01
Medications
Anti-arrhythmic*	22	9	NS
Rate-slowing†	25	12	NS
Hypertension	18	8	NS
Diabetes Mellitus	7	4	NS

Key: CL, Cycle length; LA, Left atrial; LVEF, Left ventricular ejection fraction; NYHA, New York Heart Association Heart Failure Class;

^*Therapy with class I or class III agents;

^†Therapy with β-blocker or calcium antagonists.