Key result
Oleic acid lung injury increased the critical closing pressure of pulmonary vessels, which exceeded left atrial pressure and became the effective outflow pressure responsible for pulmonary hypertension.
Why the study?
Does oleic acid-induced lung injury alter the pulmonary arterial pressure-flow and pressure-left atrial pressure relationships in dogs?
Population
16 intact anesthetized and ventilated dogs (n=7 for Ppa-Q relationship, n=9 for Ppa-Pla relationship)
Comparison
Oleic acid (0.09 ml/kg iv) to induce lung injury vs Baseline (before oleic acid administration)
Design
Preclinical
Authors
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Suggests critical closing pressure drives pulmonary hypertension in lung injury; hypothesis-generating in animals, needs human validation.
Does oleic acid-induced lung injury alter the pulmonary arterial pressure-flow and pressure-left atrial pressure relationships in dogs?
Oleic acid-induced lung injury increases the critical closing pressure in the pulmonary circulation, which becomes the effective outflow pressure and causes pulmonary hypertension.
Leeman et al. (1990) studied Pulmonary hypertension secondary to oleic acid pulmonary edema (n=16). Oleic acid vs. Baseline (before oleic acid) was evaluated on Pulmonary arterial pressure-flow relationship and Ppa-Pla relationship. Oleic acid lung injury increased the critical closing pressure of pulmonary vessels, which exceeded left atrial pressure and became the effective outflow pressure responsible for pulmonary hypertension.
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