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The Valsalva maneuver (VM) provokes strong changes in the cardiovascular system and is therefore well suited to study the cardiac-coronary interaction in humans. In 12 patients undergoing catheterization we simultaneously recorded aortic pressure, left ventricular pressure, and intracoronary pressure (Pd) and flow velocity (U) while the patients were performing a VM. Coronary wave intensity was calculated...
Hemodynamic monitoring provides vital information for diagnosing and treating patients in acute clinical settings. A method is investigated to non-invasively monitor changes in the hemodynamic state. The approach utilizes short-axis ultrasound color flow imaging and processing methods to produce simultaneous waveforms for the arterial area and flow. Beat-to-beat measurements of the mean area, peak...
To explore the grey relation between hemodynamic parameters and the diversity of non-invasive systolic blood pressure (NISBP) and invasive systolic blood pressure (INSBP), NISBP-INSBP diversity and hemodynamic parameters were measured in 16 female hypertensive patients. Grey analysis was performed to explore their relations. The diversity of NISBP and INSBP was -29.94??20.815 mmHg. The radial perk...
A proven implantable device is now available for long-term ambulatory monitoring of the right ventricular pressure (RVP) waveform of congestive heart failure patients. However, cardiac output (CO) and left atrial pressure (LAP) are far more useful for assessing cardiac function and managing volume status. We developed a new technique to monitor both CO and LAP by analysis of the RVP waveform based...
One of the chief factors, incriminated for the formation of intimal hyperplasia at the venous side of an arteriovenous shunt (AVS), is the disturbed hemodynamic condition in that region. Owing to the difficulty of properly measuring the local flow field in AVS, numerical computation has been extensively used for its assessment. The purpose of this study was to examine the flow field in AVS with computational...
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