Document Detail

Peripheral pulmonary vascular resistance.
MedLine Citation:
PMID:  8458776     Owner:  NLM     Status:  MEDLINE    
The pressure-flow relationship has been studied in a peripheral portion of the lung vasculature in anesthetized dogs with use of a double-lumen catheter wedged in a distal pulmonary artery. One lumen was used to infuse mixed venous blood in the wedged area and the other to measure the corresponding perfusion pressure. Flow ranged from 0 to 9.2 ml/min, and the mean volume of the wedged area (n = 59) was 0.75 +/- 0.05 (SE) ml. In the areas where the distal pulmonary artery was in the same direction as the catheter ("coaxial"), the mean pressure-flow curve showed a negligible gamma-intercept and no significant difference between ascending and descending flow. The slope of the initial part of the ascending limb (peripheral pulmonary vascular resistance) varied from site to site and did not show a significant correlation with the overall pulmonary vascular resistance; it was inversely correlated with the volume of the wedged area (r = -0.35, P < 0.05) and directly, as expected, correlated with the y-intercept (r = 0.78, P < 0.001) and hysteresis (r = 0.48, P < 0.001). The results of two consecutive pressure-flow runs in the same site showed similar results, with no difference exceeding the error of measurement. In contrast, the slope increased by 71% during hypoxia (fraction of inspired O2 was 0.10, n = 5). This procedure seems suitable to determine the effects of physiological or pharmacological interventions on the pulmonary vessels, without interference of the systemic circulation.
F Schrijen; C Saunier; F Chabot
Related Documents :
7839766 - Acute pulmonary oedema in patients with primary pulmonary hypertension and normal pulmo...
23802106 - Elevated blood pressure among rural south african children in thohoyandou, south africa.
3407786 - Forward diastolic flow in pulmonary artery induced by right atrial contraction of pig h...
7452896 - Estimation of the compliance of the human pulmonary "venous" system from pulmonary arte...
7124306 - Effect of supramaximal vagal stimulation in combination with hypoxia, respiratory acido...
16358136 - The influences of positive end expiratory pressure (peep) associated with physiotherapy...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  74     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1993 Feb 
Date Detail:
Created Date:  1993-04-27     Completed Date:  1993-04-27     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  613-6     Citation Subset:  IM; S    
Institut National de la Santé et de la Recherche Médicale Unité 14, Vandoeuvre, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Anoxia / physiopathology
Blood Gas Analysis
Blood Pressure / physiology
Cardiac Output / physiology
Oxygen Consumption / physiology
Pulmonary Circulation / physiology*
Pulmonary Wedge Pressure / physiology
Vascular Resistance / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Food restriction-induced transformations in cardiac functional and biochemical properties in rats.
Next Document:  Influence of respiration on heart rate and blood pressure fluctuations.