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 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 کاملIncreased Mitral-Aortic Separation
We recently speculated that mitral-aortic separation (MAS) might be increased in discrete subaortic stenosis (DSS). We have examined this hypothesis in 22 heart specimens in which the subaortic obstruction originated on the muscular ventricular septum below the right aortic sinus, either as a discrete band, an accumulation of several bands or a diffuse ridge, and extended posteriorly into the M...
متن کاملDescending Aortic Flow Contribution to Intrathoracic Impedance—development and Preliminary Testing of a Dual Impedance Model
Objective. Impedance measurement of cardiac output has struggled to become established partly because there have been only a few attempts to establish a sound theoretical basis for this measurement. Our objective is to demonstrate that there is valuable aortic flow information available from an intrathoracic impedance signal which may eventually be useful in the measurement of cardiac output by...
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ژورنال
عنوان ژورنال: Circulation
سال: 1994
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.89.6.2945