Effects of pulmonary embolism on regional myocardial blood flow

H. Newland Oldham*, James Lewis Cox, Harvey I. Pass, Andrew S. Wechsler, David C. Sabiston

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The effects of autologous pulmonary embolism and pulmonary artery constriction on regional myocardial blood flow and ventricular hemodynamics were evaluated in 15 trained, awake, spontaneously breathing dogs. RV and LV myocardial blood flows were measured by 8 to 10μ radioactive microspheres. Tension-time index and minute work were calculated for each ventricle to indicate hemodynamic load. Control measurements were compared with those obtained following pulmonary artery constriction and after pulmonary embolism at equal levels of increased afterload. Arterial blood pressure, heart rate, and arterial Po2 were unchanged throughout the study. Control RV myocardial flow averaged 59 percent of LV myocardial flow. Both pulmonary artery constriction and embolism produced a twofold increase in blood flow to the RV myocardium without corresponding changes in LV myocardial flow. Indices of RV hemodynamic load significantly increased during constriction and embolism without changes in LV values. Both interventions were accompanied by parallel decreases in RV coronary vascular resistance. These data indicate that the compensated RV responds to increased regional work load following either pulmonary artery constriction or pulmonary embolism by local autoregulation producing an increase in RV myocardial blood flow independent of LV hemodynamics or myocardial blood flow.

Original languageEnglish (US)
Pages (from-to)160-169
Number of pages10
JournalSurgery
Volume76
Issue number1
StatePublished - Jul 1974

ASJC Scopus subject areas

  • Surgery

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