Document Detail


Paradoxical forearm vasodilatation and haemodynamic improvement during cardiopulmonary baroreceptor unloading in patients with congestive heart failure.
MedLine Citation:
PMID:  8384949     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. To examine the contribution of paradoxical reflex forearm vasodilatation during unloading of cardiopulmonary baroreceptors to systemic haemodynamics, the responses of central and peripheral haemodynamics during lower-body negative pressure were measured in 24 patients with chronic congestive heart failure (New York Heart Association functional class II-IV) and were compared with those of 10 normal subjects. 2. Lower-body negative pressure of less than -20 mmHg caused a significant forearm vasoconstriction in normal subjects but not in patients with congestive heart failure. In the individual cases, however, eight patients (subgroup A) had a significant forearm vasoconstriction, whereas 10 patients (subgroup B) had a paradoxical forearm vasodilatation. The remaining six patients had a blunted forearm vascular response. Baseline pulmonary capillary wedge pressure (26 +/- 3 versus 20 +/- 1 mmHg, means +/- SEM) and left ventricular wall stress in end-diastole (57 +/- 6 versus 37 +/- 4 g/cm2) were significantly (P < 0.05) higher in subgroup B than in subgroup A. 3. During lower-body negative pressure of -20 mmHg, the plasma level of noradrenaline, systemic vascular resistance and cardiac index did not change significantly in subgroup A. In subgroup B, however, during this orthostatic stimulus systemic vascular resistance fell significantly from a baseline value of 2023 +/- 109 to 1740 +/- 110 dyn s-1 cm-5 (P < 0.01) and cardiac index increased significantly from a baseline value of 2.0 +/- 0.1 to 2.5 +/- 0.2 1 min-1 m-2 (P < 0.01) despite there being no significant change in the plasma level of noradrenaline. 4. After treatment, a second bout of lower-body negative pressure was applied to seven patients in subgroup B. The forearm vascular response to the second bout of lower-body negative pressure was normalized. 5. These data suggest that the patients with more severe heart failure show a paradoxical forearm vasodilatation during mild lower-body negative pressure and that this altered cardiopulmonary baroreflex control of the circulation serves to improve the depressed cardiac performance.
Authors:
K Nishian; S Kawashima; T Iwasaki
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  Clinical science (London, England : 1979)     Volume:  84     ISSN:  0143-5221     ISO Abbreviation:  Clin. Sci.     Publication Date:  1993 Mar 
Date Detail:
Created Date:  1993-05-04     Completed Date:  1993-05-04     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7905731     Medline TA:  Clin Sci (Lond)     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  271-80     Citation Subset:  IM; S    
Affiliation:
First Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Cardiac Output / physiology
Echocardiography
Forearm / blood supply*
Heart Failure / blood,  physiopathology*,  ultrasonography
Hemodynamics / physiology*
Humans
Lower Body Negative Pressure*
Male
Middle Aged
Norepinephrine / blood
Pressoreceptors / physiology*
Vascular Resistance / physiology
Vasodilation / physiology*
Chemical
Reg. No./Substance:
51-41-2/Norepinephrine

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


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