Cimetidine, vasopressin and chronotropic incompetence

Area of Science:

• Cardiology
• Pharmacology
• Gastroenterology

Background:

• Variceal bleeding is a serious complication of liver disease.
• Vasopressin and cimetidine are used to manage variceal bleeding.

Observation:

• A patient receiving intravenous vasopressin and cimetidine for variceal bleeding developed severe bradycardia and heart blocks.
• The most significant cardiac rhythm abnormalities occurred during combined therapy.

Findings:

• The patient experienced sinoatrial and atrioventricular blocks, progressing to terminal bradycardia and asystole.
• Post-mortem examination revealed only mild coronary artery disease, suggesting the drugs were the likely cause.

Implications:

• Combined vasopressin and cimetidine therapy poses significant cardiac risks.
• This case highlights the need for careful monitoring during such treatments.
• Further research into the cardiovascular hazards of this drug combination is warranted.