[Effect of heart rate on cardiac hemodynamics in patients with aortic regurgitation].
We evaluated the effects of heart rate on cardiac hemodynamics in 10 patients with aortic regurgitation (AR, mean regurgitant fraction: 64.3%). Cardiac catheterization was performed in all patients, and the hemodynamic parameters were obtained by increasing heart rate (80.100.120.140) using right atrial pacing. Regurgitant fraction and total systemic resistance were improved up to 100/min, but aggravated on further increase in heart rate. Cardiac function curve was remarkably improved up to 100/min, but aggravated on further increase in heart rate. LV end-diastolic pressure-volume relation was moved toward the left lower direction up to 100/min, but toward the left upper direction on further increase in heart rate. Thus, it was concluded that in severe AR, cardiac function was improved up to 100/min, but aggravated on further increase in heart rate.
Nakamura
T
T
Department of Medicine, Kawasaki Medical School.
Nezuo
S
S
Sawayama
T
T
Hasegawa
K
K
Kawahara
Y
Y
Tadaoka
S
S
Inoue
S
S
Tamura
K
K
Tanaka
J
J
D001022:Aortic Valve Insufficiency / Q000503:physiopathology*; D005260:Female; D006339:Heart Rate; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D013318:Stroke Volume; D014655:Vascular Resistance