What is the clinical evidence from this study?

Study design: Other. Intervention: Venous and arterial occlusion. Primary outcome: Vascular compliance and viscoelasticity.

What question did this study set out to answer?

To characterize dynamic versus static vascular compliance and evaluate the viscoelastic behavior of blood vessels in isolated lung lobes under varying flow and oxygenation conditions.

November 1, 1986Journal of Applied Physiology

Pulmonary vascular compliance and viscoelasticity

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Key result

In dog lung lobes, static compliance was always larger than dynamic compliance, which decreased with increasing blood flow rate, suggesting vessel wall viscoelasticity and volume-dependent compliance.

Population

dog lung lobes

Comparison

venous occlusion followed by arterial occlusion… vs static volume vs. pressure curves obtained by…

Design

Preclinical

Authors

JLJ. H. LinehanNorthwestern University CDC. A. DawsonMarquette University DRD. A. RickabyMedical College of Wisconsin

Discussion

Member takes

Implication

Supports viscoelastic models of pulmonary vascular compliance in dogs; human translation remains untested.

Key Points

To characterize dynamic versus static vascular compliance and evaluate the viscoelastic behavior of blood vessels in isolated lung lobes under varying flow and oxygenation conditions.
Perfused isolated canine lung lobes at a constant arterial inflow rate, recording dynamic vascular pressures following venous occlusion and subsequent arterial occlusion.
Determined static volume-pressure relationships using dye dilution methods and compared them against dynamic compliance curves across varying flow rates and during hypoxic vasoconstriction.
Formulated a compartmental mathematical model integrating volume-dependent vascular resistance, volume-dependent compliance, and vessel wall viscoelasticity to interpret pressure-time dynamics.
Static compliance consistently exceeded dynamic compliance across all trials, with dynamic compliance decreasing systematically as blood inflow rates increased.
Simultaneous venous and arterial occlusion created an isovolumic state where arterial and venous pressures decayed over time, demonstrating vessel wall stress relaxation.
Hypoxic vasoconstriction elevated total vascular resistance, reduced both static and dynamic compliance, and increased lobar vessel wall viscosity.

Structured PICO

Population

dog lung lobes

Intervention

venous occlusion (VO) followed by arterial occlusion (AO); hypoxic vasoconstriction

Comparator

static volume vs. pressure curves obtained by dye dilution

Outcome

pulmonary vascular compliance (static vs dynamic) and viscoelasticitysurrogate

In dog lung lobes, dynamic pulmonary vascular compliance is lower than static compliance and flow-dependent, which can be explained by a compartmental model incorporating volume-dependent resistance/compliance and viscoelastic vessel walls.

Cite This Study

Linehan et al. (1986) studied this question. Venous and arterial occlusion was evaluated on Vascular compliance and viscoelasticity. In dog lung lobes, static compliance was always larger than dynamic compliance, which decreased with increasing blood flow rate, suggesting vessel wall viscoelasticity and volume-dependent compliance.

synapsesocial.com/papers/6a97800e1048ae47fb76ebb2 https://doi.org/10.1152/jappl.1986.61.5.1802

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Pulmonary vascular compliance and viscoelasticity

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Pulmonary vascular compliance and viscoelasticity

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider