Haemodynamic effects of Isodinit (isosorbide dinitrate) in acute myocardial infarction

Area of Science:

• Cardiology
• Pharmacology

Background:

• Acute myocardial infarction (AMI) can lead to congestive heart failure, necessitating hemodynamic support.
• Isosorbide dinitrate (ISDN) is a vasodilator with potential benefits in managing cardiac emergencies.

Purpose of the Study:

• To evaluate the hemodynamic effects of sublingual ISDN in patients with acute transmural myocardial infarction.
• To assess ISDN's efficacy in patients with normal versus elevated pulmonary artery pressure.

Main Methods:

• Hemodynamic parameters including heart rate, pulmonary arterial pressure, peripheral arterial pressure, cardiac output, and peripheral vascular resistance were measured.
• Sublingual ISDN was administered to 26 patients with AMI.
• Patients were stratified based on baseline diastolic pulmonary artery pressure.

Main Results:

• Sublingual ISDN significantly reduced pulmonary arterial pressure (35%) and peripheral arterial pressure (10-14%).
• Peripheral vascular resistance decreased slightly; heart rate remained largely unchanged.
• In patients with normal pulmonary artery pressure, cardiac index, stroke index, and stroke work index decreased, while these were unchanged in patients with elevated pulmonary pressure.
• ISDN's effects manifested within 5-7 minutes, peaked at 15-45 minutes, and resolved within 2 hours.

Conclusions:

• Sublingual ISDN demonstrates significant acute hemodynamic benefits in patients with acute myocardial infarction.
• ISDN is a viable therapeutic option for managing congestive heart failure associated with acute myocardial infarction.
• The drug's efficacy and impact on cardiac performance vary depending on baseline pulmonary artery pressure.