Acebutolol and left ventricular function: assessment by radionuclide angiography

Area of Science:

• Cardiology
• Pharmacology

Background:

• Chronic angina pectoris affects global and regional left ventricular function.
• Beta-blockers are commonly used for angina management.

Purpose of the Study:

• To evaluate the effects of acebutolol on left ventricular function in patients with chronic angina.
• To assess the safety and efficacy of acebutolol in improving cardiac performance during rest and exercise.

Main Methods:

• 26 patients with chronic angina underwent radionuclide angiography at rest and during maximal exercise.
• Patients received either placebo or oral acebutolol (400 mg three times daily).
• Global and regional left ventricular function were assessed using ejection fraction and wall motion analysis.

Main Results:

• Acebutolol showed a statistically significant improvement in resting ejection fraction (51% to 54%, p<0.05).
• No patient experienced a significant decrease in resting ejection fraction; only one patient had fluid retention.
• Exercise ejection fraction remained similar, but acebutolol normalized exercise-induced ejection fraction response in 4 patients and regional wall motion abnormalities in 5 patients.

Conclusions:

• Cardioselective beta blockade with acebutolol is safe in effective antianginal doses.
• Acebutolol may improve both resting and exercise left ventricular function in patients with chronic angina.
• Acebutolol offers a potential therapeutic benefit beyond symptom relief in angina management.