The purpose of this study was to conduct a controlled evaluation of the continuous-wave Doppler technique for the estimation of stroke volume changes. Six anesthetized dogs were studied. Aortic blood velocity was recorded from the suprasternal notch by a special continuous-wave Doppler unit. Cardiac output was varied by fluid infusion and exsanguination, and over 300 simultaneous records of aor...

Background: Post partum hemorrhage is one of the common causes in maternal morbidity and mortality and its outcome depends on accurate estimation of blood loss which needs acquiring skills. In this study, we decided to evaluate the effect of education on visual blood volume estimation by using simulation. Method: This prospective study was done in Mashhad University of Medical Sciences and 40 o...

CHEST I 85 I 5 I MAY, 1984 711 not withhold any information from the patient or her physicians, and culture reports, which came from another institution, were not received by us until late in her terminal illness. We feel qualified to comment on tuberculosis, but do not claim similar expertise for AIDS. One of our internal medicine residents contacted the CDC regarding this patient, and they cl...

Sources of error in the estimation of ventricular volume from CAT scans are discussed and the accuracy of the measurement assessed. Two methods of calculating ventricular volume from an intraventricular injection of radioisotope are described and compared. Finally, the CAT scan and isotope methods are compared and contrasted. The error associated with a single measurement of volume by any of th...

In the past two lectures, we have been analyzing the construction of an f.p.r.a.s. to estimate the volume of a convex body K ⊆ R in the membership oracle model. We assumed a general upper bound on the mixing time of heat-bath ball walks, and used this assumption to analyze our construction. In this section, we prove the assumed bound. Recall that the Poincaré constant is defined by α = infφ:K→R...