Blood Flow in the Pulmonary Artery
Figure 2.1 shows waveforms of the blood flow-rate and pressure measured simultaneously in the main pulmonary artery and the ascending aorta of a dog (van den Bos et al. 1982). The duration of the ejection flow in the pulmonary artery is longer than that in the aorta. The pulmonary flow waveform has a rounder peak than the aortic flow waveform. The peak value of the pulmonary flow-rate is smaller than that of the aortic flow-rate. In the pulmonary artery, pressure and flow waves look alike, but this is not so in the aorta. The pulmonary pressure and flow waveforms are determined by the pump function of the right ventricle and the characteristics of the pulmonary circuit. The aortic pressure and flow waveforms are determined by the pump function of the left ventricle and the characteristics of the systemic circuit. However, the main features of the relation between the pressure and the flow waveforms in each circulatory system are determined by the characteristics of each circuit only.
KeywordsPulmonary Artery Pulse Wave Velocity Wave Reflection Main Pulmonary Artery Pump Function
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