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Effects of nitrate therapy on ventricular remodeling and function
1Department of Medicine, University of Alberta, Edmonton, Canada.
The American Journal of Cardiology
|December 16, 1993
Summary
Nitrate therapy, including nitroglycerin, effectively reduced heart damage and improved function after myocardial infarction. This treatment limited left ventricular remodeling and decreased complications and mortality in clinical studies.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Left ventricular remodeling is a significant pathophysiologic process after acute myocardial infarction.
- Nitrates are hypothesized to limit this remodeling and improve cardiac function.
Purpose of the Study:
- To evaluate the efficacy of low-dose intravenous nitroglycerin in limiting left ventricular remodeling and improving function post-myocardial infarction.
Main Methods:
- A prospective, randomized, single-blinded, placebo-controlled study of 310 patients during the pre-thrombolytic era.
- Two subsequent studies in the thrombolytic era assessed prolonged nitrate therapy (intravenous followed by buccal) over 6 weeks post-infarction.
Main Results:
- Nitroglycerin significantly reduced infarct size, left ventricular dysfunction, and infarct expansion.
- Fewer in-hospital complications (e.g., heart failure, cardiogenic shock) and deaths were observed with nitroglycerin.
- Prolonged nitrate therapy further limited left ventricular remodeling and improved function compared to placebo.
Conclusions:
- Low-dose intravenous nitroglycerin is safe and beneficial in acute myocardial infarction.
- Nitrate therapy effectively limits adverse left ventricular remodeling and improves outcomes post-myocardial infarction, both in the pre-thrombolytic and thrombolytic eras.