Hyperinsulinemia in patients with spastic angina pectoris
R Miyawaki1, Y Urabe, T Furuki
1Department of Internal Medicine, Fukuoka University Chikushi Hospital, Japan.
Cardiology
|December 16, 1997
Summary
This study found that hyperinsulinemia, or high immunoreactive insulin (IRI), is linked to coronary artery spasm in angina patients. Elevated IRI levels were observed in patients with spastic angina compared to controls.
Area of Science:
- Cardiology
- Endocrinology
- Metabolic Syndrome Research
Background:
- Angina pectoris is a common cardiovascular condition with various underlying causes.
- Hyperinsulinemia, characterized by high immunoreactive insulin (IRI) levels, is increasingly recognized as a potential contributor to cardiovascular disease.
- The relationship between coronary artery spasm and hyperinsulinemia requires further elucidation.
Purpose of the Study:
- To investigate the association between coronary artery spasm and hyperinsulinemia in patients experiencing angina pectoris.
- To compare IRI levels and glucose metabolism in patients with spastic angina, fixed-obstructive coronary sclerosis, and healthy controls.
Main Methods:
- A cohort study involving 30 patients with spastic angina, 30 with fixed-obstructive coronary sclerosis, and 30 matched controls.
- Performance of a 75-gram oral glucose tolerance test (OGTT) with serial measurements of blood glucose and IRI.
- Measurement of serum total cholesterol, triglyceride, and HDL cholesterol levels.
Main Results:
- Significantly higher IRI levels at 60 minutes, peak IRI, sigma IRI, and the IRI/blood sugar ratio were observed in angina patients compared to controls.
- Patients with fixed-obstructive coronary sclerosis exhibited significantly increased total cholesterol and LDL cholesterol levels compared to controls.
- These findings suggest a strong link between elevated IRI and coronary artery spasm.
Conclusions:
- Hyperinsulinemia is significantly associated with coronary artery spasm in patients with angina pectoris.
- Elevated IRI may play a crucial role in the pathophysiology of spastic angina.
- Further research into the metabolic underpinnings of coronary artery disease is warranted.
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