Oxygen Therapy Lowers Right Ventricular Afterload in Experimental Acute Pulmonary Embolism
OBJECTIVES:
To investigate if oxygen could unload the right ventricle and improve right ventricle function in a porcine model mimicking intermediate-high risk acute pulmonary embolism.
DESIGN:
Controlled, blinded, animal study.
SETTING:
Tertiary university hospital, animal research laboratory.
SUBJECTS:
Female, Danish pigs (n = 16, approximately 60 kg).
INTERVENTIONS:
Acute autologous pulmonary embolism was induced until doubling of baseline mean pulmonary arterial pressure. Group 1 animals (n = 8) received increasing Fio2 (40%, 60%, and 100%) for time intervals of 15 minutes returning to atmospheric air between each level of Fio2. In group 2 (n = 8), the effects of Fio2 40% maintained over 75 minutes were studied. In both groups, pulmonary vasodilatation from inhaled nitric oxide (40 parts per million) was used as a positive control.
MEASUREMENTS AND MAIN RESULTS:
Effects were evaluated by biventricular pressure-volume loop recordings, right heart catheterization, and arterial and mixed venous blood gasses. Pulmonary embolism increased mean pulmonary arterial pressure from 15 ± 4 to 33 ± 6 mm Hg (p = 0.0002) and caused right ventricle dysfunction (p
Source: Critical Care Medicine - Category: Emergency Medicine Tags: Online Laboratory Investigations Source Type: research
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