Induced atrial fibrillation in patients without organic heart disease was well tolerated hemodynamically, with heart rate increasing from 73 to 128 beats/min (P<0.001) and cardiac index unchanged.
Observational (n=15)
Absolute Event Rate: 128% vs 73%
p-value: p=<0.001
The hemodynamics of induced atrial fibrillation (AF) was investigated in 15 patients (ages 58 +/- 11 years) with paroxysmal AF presenting without organic heart disease or hypertension. A hemodynamic study was performed both during sinus rhythm and after the induction of AF. The mean heart rate increased from 73 +/- 11 to 128 +/- 18 beats/min (P < 0.001) after AF. Systolic and mean aortic pressures did not significantly change, and diastolic aortic pressure increased (78 +/- 11 vs 89 +/- 12 mmHg, P < 0.01). Left ventricular end-diastolic pressure decreased during AF (9 +/- 3 vs 6 +/- 2.6 mmHg, P < 0.005), whereas mean pulmonary wedge pressure increased (8 +/- 2 vs 12 +/- 4 mmHg, P < 0.001). Systolic pulmonary arterial pressure did not show significant variations, and there was a slight but statistically significant increase in the diastolic and mean pulmonary arterial pressures (P < 0.01). The right ventricular end-diastolic pressure decreased during AF (5.6 +/- 2 vs 3.8 +/- 2 mmHg, P < 0.01), whereas mean right atrial pressure showed a trend toward an increase. Stroke volume markedly decreased (P < 0.001) while the cardiac index did not significantly change. Systemic vascular resistance, pulmonary arteriolar resistance, and the arteriovenous O2 difference showed no significant variations after the induction of AF. These results suggest that in subjects without organic heart disease, paroxysmal AF is well tolerated hemodynamically, and the rise in the atrial pressures during AF is not related to an increase in the ventricular end-diastolic pressure.
Alboni et al. (Mon,) conducted a observational in Idiopathic Paroxysmal Atrial Fibrillation (n=15). Induced atrial fibrillation vs. Sinus rhythm was evaluated on Heart rate (beats/min) (p=<0.001). Induced atrial fibrillation in patients without organic heart disease was well tolerated hemodynamically, with heart rate increasing from 73 to 128 beats/min (P<0.001) and cardiac index unchanged.