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[Smoking habit and cardiovascular diseases]
S Handa1, H Yamazaki, S Ohonishi
1Department of Medicine, School of Medicine, Keio University, Tokyo.
Nihon Kyobu Shikkan Gakkai Zasshi
|February 1, 1991
Summary
Smoking significantly reduces exercise capacity and coronary flow reserve in patients with ischemic heart disease. Quitting smoking for over two days can restore coronary flow reserve, highlighting the benefits of smoking cessation.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Public Health
Context:
- Smoking is a major modifiable risk factor for ischemic heart disease (IHD).
- Understanding the acute and chronic effects of smoking on the cardiovascular system is crucial for IHD management.
- Prevalence of smoking is notably higher in younger IHD patients.
Purpose:
- To analyze smoking habits in IHD patients.
- To evaluate the impact of smoking on exercise capacity and coronary flow reserve.
- To investigate the physiological mechanisms underlying smoking's effects on the cardiovascular system.
Summary:
- Analysis of 1000 IHD patients revealed high smoking rates, particularly in younger age groups (up to 86% in the 4th decade).
- In healthy volunteers, smoking decreased exercise time, elevated blood carbon monoxide and lactic acid, increased myocardial oxygen consumption, and reduced coronary flow reserve.
- Smoking lowers the threshold for myocardial ischemia, but coronary flow reserve improves after smoking cessation exceeding two days.
Impact:
- Demonstrates smoking's detrimental effects on cardiovascular function and exercise tolerance in IHD.
- Provides evidence for the reversibility of smoking-induced coronary flow reduction upon cessation.
- Reinforces the critical importance of smoking cessation as an intervention for patients with ischemic heart disease.