In:
American Journal of Physiology-Heart and Circulatory Physiology, American Physiological Society, Vol. 268, No. 2 ( 1995-02-01), p. H817-H827
Abstract:
We investigated whether the Starling resistor model (Mitzner et al. J. Appl. Physiol. 51: 1065–1071, 1981) or a distensible vessel model (Haworth et al. J. Appl. Physiol. 70: 15–26, 1991) best describes pulmonary vascular pressure-flow (Q) relationships in embolic pulmonary hypertension. Mean pulmonary arterial pressure (Ppa)-Q plots at constant left atrial pressure (Pla) and Ppa-Pla plots at constant Q were investigated in seven dogs before and after 500-micron glass bead pulmonary embolism. Embolization to a mean angiographic obstruction of 78% increased the slope and extrapolated pressure intercept (P(i)) of Ppa-Q plots and increased the inflection point of Ppa-Pla plots, above which an increase in Pla is transmitted to Ppa in a ratio of approximately 1:1. The Starling resistor and the distensible vessel model provided a reasonably good fit to the Ppa-Q and Ppa-Pla coordinates before and after embolism. However, contrary to the prediction of the Starling resistor model, no correlation was found between the inflection point of Ppa-Pla plots and P(i). We therefore conclude that an increased closing pressure is unlikely to contribute to embolic pulmonary hypertension.
Type of Medium:
Online Resource
ISSN:
0363-6135
,
1522-1539
DOI:
10.1152/ajpheart.1995.268.2.H817
Language:
English
Publisher:
American Physiological Society
Publication Date:
1995
detail.hit.zdb_id:
1477308-9
SSG:
12
