Key result
Rapid increase in left atrial pressure in rats significantly decreased pulmonary arterial compliance without changing peripheral pulmonary resistance or proximal characteristic impedance.
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Left atrial pressure warrants consideration in pulmonary impedance estimates during elevation; leaves open validation for clinical use.
Pulmonary arterial impedance estimation is minimally affected by left atrial pressure under physiological conditions; however, it is substantially affected by excessive increase in left atrial pressure. Rapid increase in atrial pressure is associated with significant decrease in pulmonary arterial compliance, with no changes in peripheral pulmonary resistance and characteristic impedance of proximal pulmonary arteries. Consequently, left atrial pressure should be taken into account when estimating pulmonary arterial impedance under conditions of elevated left atrial pressure.
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Fukumitsu et al. (2025) studied Elevated left atrial pressure (animal model). Rapid increase in left atrial pressure vs. Physiological conditions was evaluated on Pulmonary arterial compliance and impedance. Rapid increase in left atrial pressure in rats significantly decreased pulmonary arterial compliance without changing peripheral pulmonary resistance or proximal characteristic impedance.
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