Aortic Input Impedance during Nitroprusside Infusion
نویسندگان
چکیده
منابع مشابه
Aortic 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 کاملAortic input impedance during nitroprusside infusion. A reconsideration of afterload reduction and beneficial action.
Beneficial effects of nitroprusside infusion in heart failure are purportedly a result of decreased afterload through "impedance" reduction. To study the effect of nitroprusside on vascular factors that determine the total load opposing left ventricular ejection, the total aortic input impedance spectrum was examined in 12 patients with heart failure (cardiac index <2.0 liters/min per m(2) and ...
متن کاملAortic 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...
متن کاملPulsatile hemodynamics of hypertension: systematic review of aortic input impedance.
OBJECTIVE Input impedance is the frequency-dependent afterload to pulsatile blood flow. Studies of input impedance have been performed as early as the 1960s and have been applied to hypertension (HTN). However, to date, these studies have not been systematically evaluated. This systematic review aims to summarize the literature, interpret existing data from the perspective of impedance theory, ...
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ژورنال
عنوان ژورنال: Journal of Clinical Investigation
سال: 1979
ISSN: 0021-9738
DOI: 10.1172/jci109505