Takotsubo Cardiomyopathy Induced by Very Low-Dose Epinephrine Contained in Local Anesthetics: A Case Report.

BACKGROUND Takotsubo cardiomyopathy is a reversible left ventricular dysfunction triggered by emotional or physical stress. Perioperatively, takotsubo cardiomyopathy is sometimes induced by various psychological factors, such as stress from surgery, and non-psychological factors, such as epinephrine misinjection. This report describes a case of takotsubo cardiomyopathy induced by the administration of very low-dose epinephrine contained in a local anesthetic. CASE REPORT A 78-year-old woman with mycosis in the maxillary sinus was scheduled to undergo endoscopic sinus surgery. After the submucosal injection of 3 mL of local anesthetic (lidocaine, 0.5%; epinephrine, 1: 200 000) immediately before the incision, her heart rate and blood pressure reached 135 beats per min and 254/185 mmHg, respectively, inducing ventricular tachycardia. After receiving 50 mg of lidocaine, her cardiac rhythm resumed a normal sinus rhythm, without cardioversion. As her hemodynamics stabilized, the surgical procedure began as planned. Postoperative electrocardiography, echocardiography, and coronary arteriography demonstrated takotsubo cardiomyopathy. Subsequently, her cardiac movement gradually improved, and she was discharged from the hospital on postoperative day 9. CONCLUSIONS To the best of our knowledge, this is the first reported case in which a very small amount of epinephrine (0.015 mg) induced takotsubo cardiomyopathy. Therefore, epinephrine should be used cautiously, especially in the nasal mucosa, vaginal mucosa, and uterus, where blood flow is relatively high. If unexpected hemodynamic alterations and ST-segment abnormalities occur after epinephrine administration, asymptomatic takotsubo cardiomyopathy should be considered.