Responses of left ventricle to changes in aortic input impedance.
نویسندگان
چکیده
منابع مشابه
Aortic input impedance in infants and children.
Flow and pressure measurements were performed in the ascending aortas of six pediatric patients ranging in age from 1 to 4 yr and in weight from 7.2 to 16.4 kg. From these measurements, input impedance was calculated. It was found that total vascular resistance decreased with increasing patient weight and was approximately one to three times higher than those of adults. Conductance per unit wei...
متن کاملAortic input impedance in heart failure.
The input impedance of the systemic circulation was calculated from recordings of pulsatile pressure and flow in the ascending aorta of 20 patients. Ten patients had clinical and hemodynamic evidence of heart failure. The other 10 subjects had no clinical evidence of heart failure and were used as a control group. In the heart failure patients, both input resistance and characteristic impedance...
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In 18 patients who underwent coronary arteriography, aortic velocity and pressure data were obtained during a control state and during either isoproterenol infusion at 1, 2 and 3 micrograms/min or graded nitroprusside infusion (average peak dose 60 micrograms/min). Impedance moduli and phase angles were derived to 10 Hz for controls states, isoproterenol at 2 micrograms/min, and at peak nitropr...
متن کاملAortic Input Impedance during Nitroprusside Infusion
Receivedfor publication 21 November 1977 and in revised form 16 April 1979. vascular load and improve ventricular function independent of aortic pressure reduction.
متن کاملDimensional Changes of the Human Left Ventricle Prior to Aortic Valve Opening
Previous studies of the dynamic geometry of the left ventricle have yielded conflicting results concerning shape changes during the preejection period. Accordingly, left ventricular dimensional changes prior to aortic valve opening in man were analyzed using high-speed biplane cineradiograms exposed in the frontal and lateral projections. In each projection the long axis and three chords perpen...
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ژورنال
عنوان ژورنال: Japanese Circulation Journal
سال: 1985
ISSN: 0047-1828,1347-4839
DOI: 10.1253/jcj.49.215