Hemodynamic effects of morphine in cardiac disease

Area of Science:

• Cardiology
• Pharmacology
• Physiology

Background:

• Acute myocardial infarction (MI) is a critical condition requiring careful hemodynamic management.
• Opioid analgesics like morphine are often used for pain relief in MI patients, but their hemodynamic effects require thorough investigation.

Purpose of the Study:

• To evaluate the hemodynamic effects of intravenous morphine in patients with acute uncomplicated transmural myocardial infarction.
• To assess changes in cardiac output, arterial pressure, and intracardiac pressures following morphine administration.

Main Methods:

• Right heart catheterization was performed in six patients with acute MI.
• Hemodynamic parameters including intracardiac pressures, brachial artery pressure, and cardiac output were measured before and after a 10-minute infusion of 5 mg intravenous morphine.

Main Results:

• A statistically significant decrease in cardiac index (P < 0.05) and stroke index (P < 0.05) was observed post-morphine administration.
• Brachial artery pressure showed a non-significant fall, and intracardiac pressures remained largely unchanged.

Conclusions:

• Intravenous morphine, at the studied dose, can negatively impact cardiac output and stroke volume in patients with acute myocardial infarction.
• These findings suggest a need for cautious use of morphine in hemodynamically sensitive MI patients.