Key result
Propofol decreased the ratio of Ees to Ea from 0.88 to 0.56 and reduced the ratio of SW to PVA from 0.54 to 0.45, indicating impaired LV-arterial coupling and mechanical efficiency.
Why the study?
Does propofol alter left ventricular-arterial coupling and mechanical efficiency in open-chest dogs?
Population
Open-chest dogs (n=8) instrumented for measurement of aortic and LV pressure, dP/dtmax, and LV volume
Comparison
Propofol administered as 15-min intravenous… vs Baseline measurements taken 30 min after…
Design
Preclinical
Authors
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Propofol may compromise LV efficiency in canines; leaves open translation to human anesthesia and requires clinical validation.
Does propofol alter left ventricular-arterial coupling and mechanical efficiency in open-chest dogs?
Absolute Event Rate: 0.56% vs 0.88%
Propofol depresses mechanical matching of the left ventricle to the arterial system and reduces LV efficiency in a canine model, though these effects plateau at higher dosages due to concurrent reductions in afterload.
Hettrick et al. (1997) studied this question. Propofol vs. control (baseline) was evaluated on ratio of Ees to Ea (LV-arterial coupling). Propofol decreased the ratio of Ees to Ea from 0.88 to 0.56 and reduced the ratio of SW to PVA from 0.54 to 0.45, indicating impaired LV-arterial coupling and mechanical efficiency.
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