Clinical Communications: AdultsA Case of 5-Fluorouracil-Induced Cardiac Arrest

BackgroundCoronary artery vasospasm after administration of fluorouracil (5-FU) is a rare complication. Commonly presenting as chest pain during or shortly after 5-FU infusions, vasospasm can place patients at risk for ventricular dysrhythmia, myocardial ischemia, and infarction. Although not fully understood, any 5-FU cardiotoxicity seems to be multifactorial, and patients with coronary artery disease and renal dysfunction may be at particular risk.Case ReportA 46-year-old woman with no prior cardiovascular disease history presented with sudden-onset chest pain after initial administration of 5-FU continuous infusion therapy. The patient subsequently developed ventricular fibrillation arrest and underwent successful electrocardioversion. Coronary angiography was unremarkable for coronary stenosis or vasospasm. The presumed etiology was secondary to 5-FU cardiac toxicity. The patient was re-challenged with 5-FU therapy and developed repeat chest pain. The 5-FU was completely stopped and the patient's symptoms resolved, with no further dysrhythmic events 9 months after initial presentation.Why Should an Emergency Physician Be Aware of This?Patients who develop chest pain during or after 5-FU infusion should warrant strong consideration for admission and continuous cardiac monitoring for potential ventricular dysrhythmias and cardiac ischemia.