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• W1990996675 abstract "The relative importance of atrial systole on left ventricular filling was investigated at rest and during exercise in 25 patients with dual chamber pacemakers. The mean blood flow velocity over the atrial valve, the velocities of the rapid filling phase (E), the active filling phase (A), and the E/ A ratio were determined for pulsed Doppler-echocardiography. The patients were first examined at rest during AV sequential pacing (DVI) at 70 and 104 beats/mm. The investigation was subsequently repeated during atrial synchronous pacing (VDD) at rest and during supine submaximal exercise at workloads adjusted to achieve heart rates corresponding to those during DVI pacing. The mean blood flow velocity at rest did not differ between DVI and VDD pacing at 70 beats/mm (0.46 vs 0.49 m/sec). When (he resting heart rate was increased to 104 beats/min (DVI) the mean blood flow velocity increased to 0.56 msec (P < 0.001). At a corresponding heart rate during exercise (VDD) the velocity increased to 0.70 msec (P < 0.001). At a resting heart rate of 70 beats/min the E/A ratio (n = 14) did not differ significantly between DVI and VDD pacing. With an increased resting heart rate (DVI) the E/A ratio decreased from 0,94 ± 0.45 to 0.78 ± 0.18; NS. When the heart rate increased during exercise (VDD) the E/A ratio increased from 0.75 ± 0.14 to 0.97 ± 0.16; P < 0.001. There was a positive correlation between the increase of the mean blood flow velocity and the increase of the E/A ratio during exercise (r = 0.69, P < 0,01). No such correlation was found when the heart rate was changed at rest. Thus, the importance of atrial systole on ventricular filling diminishes during exercise in accordance with increasing blood flow velocity, which by physical principles is related to the kinetic energy. The relative importance of atrial systole is hence inversely correlated to the kinetic energy of the blood flow." @default.
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• W1990996675 date "1992-11-01" @default.
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• W1990996675 title "The Hemodynamic Importance of Atrial Systole: A Function of the Kinetic Energy of Blood Flow?" @default.
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• W1990996675 doi "https://doi.org/10.1111/j.1540-8159.1992.tb02962.x" @default.
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