Use of a right ventricular continuous flow pump to validate the distensible model of the pulmonary vasculature

Title:

Use of a right ventricular continuous flow pump to validate the distensible model of the pulmonary vasculature

Creator:

Vanden Eynden, F. , Segers, P., Bové, T. , De Somer, F., El Oumeiri, B., and Van Nooten, G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b19dd06a-48fd-4d6c-a49c-913ae8b45f89
uuid:b19dd06a-48fd-4d6c-a49c-913ae8b45f89
doi:10.33549/physiolres.933894

Subject:

Pulmonary circulation, Distensibility, Assist device, and Vascular resistence

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

In the pulmonary circulation, resistive and compliant properties overlap in the same vessels. Resistance varies nonlinearly with pressure and flow; this relationship is driven by the elastic properties of the vessels. Linehan et al. (1982) correlated the mean pulmonary arterial pressure and mean flow with resistance using an original equation incorporating the distensibility of the pulmonary arteries. The goal of this study was to validate this equation in an in vivo porcine model. In vivo measurements were acquired in 6 pigs. The distensibility coefficient (DC) was measured by placing piezo-electric crystals around the pulmonary artery (PA). In addition to experiments under pulsatile conditions, a right ventricular (RV) bypass system was used to induce a continuous pulmonary flow state. The Linehan's equation was then used to predict the pressure from the flow under continuous flow conditions. The diameter-derived DC was 2.4 %/mmHg (±0.4 %), whereas the surface area-based DC was 4.1 %/mmHg (±0.1 %). An increase in continuous flow was associated with a constant decrease in resistance, which correlated with the diameter-based DC (r=-0.8407, p=0.044) and the surface areabased DC (r=-0.8986, p=0.028). In contrast to the Linehan’s equation, our results showed constant or even decreasing pressure as flow increased. Using a model of continuous pulmonary flow induced by an RV assist system, pulmonary pressure could not be predicted based on the flow using the Linehan’s equation. Measurements of distensibility based on the diameter of the PA were inversely correlated with the resistance.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

233-243

Source:

Physiological research | 2019 Volume:68 | Number:2

Harvested from:

CDK

Metadata only:

false