trimethoprim--sulfamethoxazole-drug-combination and Cystitis--Interstitial

Drug-induced methemoglobinemia is a well-described entity but has not been previously associated with elevated troponins in the absence of cardiac symptoms. We report a case of a patient presenting to the emergency department (ED) with complaints related to an exacerbation of her long-standing cystitis. A low pulse oximetry reading prompted an evaluation, revealing a troponin leak, which peaked at 10 hours. Her methemoglobin level was found to be elevated at 11.4%, but a preexisting anemia apparently prevented the clinical recognition of cyanosis. The methemoglobinemia was determined to be secondary to her ingestion of phenazopyridine and trimethoprim-sulfa methoxizole. Although phenazopyridine and sulfa agents have long been known to cause methemoglobinemia, our patient exhibited an asymptomatic troponin leak that has not been previously reported as a complication of drug-induced methemoglobinemia. Clinicians should be aware of this potential association.

Topics: Anesthetics, Local; Anti-Infective Agents, Urinary; Cystitis, Interstitial; Female; Humans; Methemoglobinemia; Middle Aged; Myocardial Ischemia; Phenazopyridine; Trimethoprim, Sulfamethoxazole Drug Combination; Troponin I

Topics: Anesthetics, Local; Anti-Infective Agents, Urinary; Cystitis, Interstitial; Female; Humans; Methemoglobinemia; Myocardial Ischemia; Phenazopyridine; Trimethoprim, Sulfamethoxazole Drug Combination; Troponin I

Topics: Anesthetics, Local; Anti-Infective Agents, Urinary; Cystitis, Interstitial; Female; Humans; Methemoglobinemia; Myocardial Ischemia; Phenazopyridine; Trimethoprim, Sulfamethoxazole Drug Combination; Troponin I