In unanesthetized, unrestrained cats, placed in a sound-attenuated cage, stroke volume and cardiac output were continuously monitored by an electromagnetic flow transducer chronically implanted around the ascending aorta, arterial pressure was measured by means of a femoral catheter connected to a strain-gauge transducer, and heart rate by a cardiotachograph. Total resistance was computed by di...

The haemodynamic effects of oral prazosin and hydralazine were evaluated in patients with refractory heart failure and compared with those of intravenous nitroprusside in the same patients. Both oral agents were well tolerated and appeared to have beneficial haemodynamic effects. Prazosin and hydralazine produced similar increases in cardiac output associated with a similar decrease in systemic...

Cardiac output, blood volume, total peripheral resistance, and renal blood flow were measured in awake salt-sensitive and salt-resistant Dahl rats on normal rat chow (1% NaCl) and on high salt (8% NaCl) diets. Rats were studied after 4, 8, and 46 weeks on a 1% NaCl diet and after 4 and 8 weeks on an 8% NaCl diet. Salt-sensitive rats on 8% NaCl for 4 weeks developed systolic hypertension; by 8 w...

The hemodynamic basis of neurogenic hypertension was studied in unanesthetized rabbits 10 minutes to 30 days after sinoaortic denervation (SAD). The fractional distribution of "Rb to body tissues was determined and used to calculate regional blood flow from the value of cardiac output obtained from an arterial dilution curve of the indicator. Sham-operated rabbits served as controls. Increased ...

Abstract— A new technique is proposed in this paper in order to design a current source in bipolar technology with very high output resistance while minimising output capacitance. Such techniques are useful in Electrical Impedance Tomography applications. First of all, D.C. relationships are established. Then, an expression based on the analysis of a simplified equivalent circuit, is formulated...

it is the output power and density of the lasers which determine whether a laser is a low or high-power one. if the density is less than 670mw/cm2, the laser is called a low power one. the output power of these lasers is usually less than 250mw. they use different mechanisms to accelerate wound healing such as: cellular biostimulation, improvement of circulation, vasodilation, analgesic and ant...

OBJECTIVE To measure cardiac output in healthy female anesthetized dogs by use of lithium dilution cardiac output and determine whether changes in mean arterial pressure were caused by changes in cardiac output or systemic vascular resistance. DESIGN Prospective clinical study. ANIMALS 20 healthy female dogs. PROCEDURE Dogs were anesthetized for ovariohysterectomy. Ten dogs breathed spont...