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Pulmonary hypertension (PH) is initially a disease of the small, peripheral resistance arteries. Changes in these vessels are best assessed by measurement of pulmonary artery pressure at several levels of flow to generate multi-point pressure-flow curves. This approach is superior to the traditional single-point measurement of pulmonary vascular resistance (PVR) because it allows a flow-independent...
The authors investigate the stability of individual differences in cardiovascular response to two behavioral stressors (mental arithmetic and concept formation) among 23 undergraduate males, at two laboratory sessions scheduled two weeks apart. Heart rate (HR), systolic and diastolic blood pressure (SPB, DBP), and measurements of pre-ejection period (PEP), stroke index (SI), cardiac index (CI), and...
To examine the effects of aortic (Ao) impedance (Z/sub c/, measured at 2-12 Hz) on LV regional systolic wall motion, measured ascending Ao flow (AoF), pressures of both LV (LVP) and Ao(AoP), and systolic segmental excursion (SE) in LV basal (B) and apical regions (A) in eight open-chest dogs. They also measured the changes of AoP ( Delta P), AoF ( Delta F) and SE in both B ( Delta Bx) and A ( Delta...
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