Cardiac energy metabolism in patients with chest pain and normal coronary angiograms

In 70 patients (94% were a consecutive series) with angina pectoris and normal coronary angiograms, we measured cardiac exchange of lactate, glucose, free fatty acids (FFAs), glutamate, alanine, citrate, and oxygen together with coronary sinus blood flow and blood pressure in response to pacing (150...

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Bibliographic Details
Published in:The American journal of cardiology 2000-02, Vol.85 (3), p.315-320
Main Authors: Bagger, Jens Peder, Thomassen, Anne, Nielsen, Torsten Toftegaard
Format: Article
Language:English
Subjects:
Adult
Angina pectoris
Angina Pectoris - metabolism
Biological and medical sciences
Cardiology
Cardiology. Vascular system
Coronary Angiography
Coronary heart disease
Electrocardiography
Exercise Test
Female
Heart
Hemodynamics
Humans
Lactic Acid - metabolism
Male
Medical sciences
Metabolism
Middle Aged
Myocardium - metabolism
Oxygen - metabolism
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Summary:In 70 patients (94% were a consecutive series) with angina pectoris and normal coronary angiograms, we measured cardiac exchange of lactate, glucose, free fatty acids (FFAs), glutamate, alanine, citrate, and oxygen together with coronary sinus blood flow and blood pressure in response to pacing (150 beats/min). Twelve patients had an abnormal exercise stress test; 26 developed ST depression and 46 had chest pain in response to pacing. Sixteen patients had no ST changes (exercise/pacing) and no pain during pacing. Pacing induced an increase in cardiac carbohydrate extraction and a decrease in FFA extraction in the entire group of patients. Less than 3% of patients had significant cardiac lactate release in response to pacing, and there were no consistent differences in the cardiac metabolic or hemodynamic responses between patient groups. The pacing-induced shift from FFA to carbohydrate extraction probably reflects the cardiac response to an acute workload. A definite sign of cardiac ischemia (lactate production) was a rare finding in these patients and not confined to the demonstration of electrocardiographic signs of ischemia.
ISSN:0002-9149
1879-1913
DOI:10.1016/S0002-9149(99)00739-0