From the Service de Physiologie et d'Explorations Fonctionnelles,
INSERM, Hôpital Louis Mourier, CHU Xavier-Bichat, Colombes, France
(A.N., F.P., S.L.), and Service d'Endocrinologie Diabetologue et
Nutrition, Hôpital Jean Verdier, Bondy, France (R.S., J-R.A., P.V.).
Correspondence to Alain Nitenberg, MD, Service de Physiologie et d'Explorations Fonctionnelles, INSERM U.426, Hôpital Louis Mourier, CHU Xavier-Bichat, 178, rue des Renouillers, F-92700 Colombes, France.
Abstract
BackgroundAcetylcholine produces
coronary artery (CA) constriction in diabetic patients,
suggesting an impairment of endothelium-dependent
dilation. In diabetes, multiple metabolic abnormalities may
inactivate nitric oxide through oxygen free radical
production.
Methods and ResultsTo examine the mechanism of this abnormal
response, two physiological tests (ie, a cold
pressor test [CPT] and coronary flow increase induced by an
injection of 10 mg papaverine [PAP] in the distal left anterior
descending CA) were performed before and after either
intravenous L-arginine (625 mg/minx10 minutes)
or intravenous deferoxamine (50 mg/minx10
minutes) in 22 normotensive nonsmoking diabetic patients with
angiographically normal CAs and normal cholesterol.
Coronary surface areas were measured with quantitative
angiography. Before the administration of L-arginine or
deferoxamine, CPT induced CA constriction in both groups
(-14±10% and -15±11%, respectively; each P<.001),
and PAP injection in distal LAD did not modify significantly proximal
LAD dimensions. In the 10 diabetic patients receiving
L-arginine, responses to CPT and PAP were not modified.
Conversely, in the 12 patients receiving deferoxamine, CA
dilated in response to the two tests (+10±9% after CPT and +22±7%
after PAP, each P<.001). Intracoronary
isosorbide dinitrate, an endothelium-independent
dilator, produced similar dilation in the two groups (+47±19% and
+41±15%, respectively; each P<.001).
ConclusionsThis study shows that (1) responses of
angiographically normal CAs to CPT and to flow increase are impaired in
diabetic patients; (2) abnormal responses are not improved by
L-arginine, suggesting that a deficit in substrate for
nitric oxide synthesis is not involved; and (3)
deferoxamine restores a vasodilator response to the two
tests, suggesting that inactivation of NO by oxygen species might be
partly responsible for the impairment of CA dilation in diabetic
patients.
© 1998 American Heart Association, Inc.
Clinical Investigations and Reports
Coronary Artery Responses to Physiological Stimuli Are Improved by Deferoxamine but not by L-Arginine in NonInsulin-Dependent Diabetic Patients With Angiographically Normal Coronary Arteries and No Other Risk Factors
Key Words: antioxidants coronary disease diabetes mellitus free radicals
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