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Coronary vasodilator responses to hypoxia before and after aminophylline
Author(s) -
Afonso S.,
Ansfield T. J.,
Berndt T. B.,
Rowe G. G.
Publication year - 1972
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1972.sp009769
Subject(s) - aminophylline , hypoxia (environmental) , vasodilation , coronary vasodilator , adenosine , medicine , cardiology , blood flow , coronary circulation , hemodynamics , anesthesia , chemistry , oxygen , organic chemistry
1. In previous studies adenosine has been postulated to be the mediator in coronary blood flow regulation and aminophylline was found to inhibit the coronary vasodilator action of adenosine. The present study was performed to determine whether aminophylline inhibits coronary vasodilatation induced by hypoxia. 2. Coronary and systemic haemodynamic and metabolic effects of hypoxia were studied in anaesthetized dogs before and after aminophylline. Aminophylline did not influence coronary vasodilatation induced by hypoxia. 3. These results are held not to lend support to the hypothesis that adenosine is the metabolite responsible for the regulation of coronary blood flow.