Key result
Arterial, venous, and double-occlusion techniques successfully evaluated pulmonary vascular compliance in canine lung lobes, yielding a total vascular compliance of 0.113 ml/kg/mmHg.
Arterial, venous, and double-occlusion techniques are useful for evaluating the longitudinal distribution of compliance in the canine pulmonary vasculature, demonstrating that venous compliance is substantially greater than arterial compliance.
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Occlusion techniques partition canine pulmonary compliance; leaves open translation to human pulmonary vascular disease.
The longitudinal distribution of pulmonary vascular compliance was evaluated in isolated canine lung lobes using arterial-(AO), venous-(VO), and double-occlusion (DO) techniques. Total vascular compliance (Ctau) was separated into pulmonary arterial (Ca) and venous compliance (Cv) in lumped model of pulmonary circulation. Under constant pulmonary venous pressure (Pv) at 5 mmHg, blood inflow to the lobe (Q) was gradually increased by changing pulmonary arterial pressure (Pa) from 10 to 22 mmHg at 4 mmHg ranges. Changes in vascular blood volume (deltaV) with each increment in Q were determined by decreased reservoir blood volume of perfusion system. DO was performed at each level of Q and allowing all vascular pressures to equilibrate at the same static pressure (Ps), which was equal to the compliance-weighted average pressure in the circulation. Ctau was obtained from the slope of the relationship between Ps and deltaV. When Pa and Pv were 14 and 5 mmHg, AO, VO, and DO were performed to measure pressures at Ca (Pca) and Cv (Pcv) and Ps. The arterial-to-venous compliance ratio (Ca/Cv) was evaluated using Pca, Pcv, and Ps measurements. Ctau was 0.113 +/- 0.012 ml/kg/mmHg. Ca/Cv was 0.30. Ca and Cv were 0.026 +/- 0.013 and 0.087 +/- 0.007 ml/kg/mmHg, respectively. These data demonstrated the usefulness of AO, VO, and DO techniques in evaluating the longitudinal distribution of compliance in canine pulmonary vasculature.
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Washizu et al. (1996) studied Pulmonary vascular compliance. Arterial, venous, and double-occlusion techniques was evaluated on Total vascular compliance (Ctau). Arterial, venous, and double-occlusion techniques successfully evaluated pulmonary vascular compliance in canine lung lobes, yielding a total vascular compliance of 0.113 ml/kg/mmHg.
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