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Vasodilator therapy in acute myocardial infarction. Use of sublingual isosorbide dinitrate
Insights
Sublingual isosorbide dinitrate significantly reduced left ventricular filling pressure and improved cardiac performance in patients with acute myocardial infarction and left ventricular failure. This vasodilator may be a valuable treatment option for acute myocardial infarction.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Acute myocardial infarction frequently leads to left ventricular failure.
- Left ventricular filling pressure is a critical indicator of cardiac performance.
Purpose of the Study:
- To evaluate the hemodynamic effects of isosorbide dinitrate in patients post-myocardial infarction with left ventricular failure.
- To assess the impact of isosorbide dinitrate on left ventricular preload and systemic blood pressure.
Main Methods:
- A study involving 10 patients with acute myocardial infarction and left ventricular failure.
- Administration of sublingual isosorbide dinitrate.
- Measurement of hemodynamic parameters including pulmonary artery wedge pressure, pulmonary artery pressure, right atrial pressure, cardiac output, and systemic blood pressure.
Main Results:
- Isosorbide dinitrate significantly reduced mean pulmonary artery wedge pressure (left ventricular filling pressure) by 35% within 10 minutes.
- Significant reductions were observed in mean pulmonary artery pressure and mean right atrial pressure.
- Cardiac output remained unchanged, while mean systemic blood pressure was significantly reduced.
Conclusions:
- Sublingual isosorbide dinitrate effectively reduces left ventricular preload and systemic blood pressure in patients with acute myocardial infarction and left ventricular failure.
- These hemodynamic improvements suggest a potential therapeutic role for long-acting vasodilators in managing acute myocardial infarction.
Abstract:
The haemodynamic effect of a long-acting vasodilator isosorbide dinitrate has been studied in 10 patients after an acute myocardial infarct, all of whom had evidence of left ventricular failure. Left ventricular filling pressure measured as the mean pulmonary artery wedge pressure was raised in all patients and fell significantly from 20+/-6 to 13+/-5 mmHg (P less than 0-001) within 10 minutes of sublingual isosorbide dinitrate. This 35 per cent fall in left ventricular preload was accompanied by significant fall in mean pulmonary artery pressure from 30+/-7 to 20+/-4 mmHg (P +less than 0-001) and mean right atrial pressure from 11+/-3 to 6+/-2 mmHg but cardiac output measured by thermodilution was unchanged. Mean systemic blood pressure was also significantly reduced. This improvement in left ventricular performance resulting from a reduction in left ventricular filling pressure and systemic blood pressure indicates that there may be a place for long-acting vasodilator in the treatment of acute myocardial infarction.