[Two cases of circulatory failure after local infiltration of epinephrine during tonsillectomy].

We experienced two cases of circulatory failure after local infiltration of 0.0005% epinephrine solution for the purpose of prophylactic hemostasis during tonsillectomy under sevoflurane anesthesia. Case 1: A 14 year-old girl developed ventricular bigeminy, tachycardia and hypertension following infiltration of the epinephrine solution 6ml around the tonsil. Sinus rhythm returned with intravenous lidocaine 40 mg and propranolol 0.4 mg. However, the patient showed gradually decreasing heart rate, depressed ST segments and inverted T waves and poor peripheral circulation. Her blood pressure decreased abruptly at the same time and finally the pulsation of the radial and femoral arteries was not palpable. She was treated with intravenous ephedrine in vain. Therefore, she received intravenous epinephrine and cardiac massage, and then recovered from the circulatory failure with her ECG showing normal sinus rhythms. Emergence from the anesthesia was smooth. Her cardiac failure may have been caused by the decreasing cardiac contraction and the increasing afterload due to the vasoconstriction after the intravenous beta-blocker. Case 2: An eleven year-old boy showed ventricular tachycardia and hypertension after infiltration of the epinephrine solution 11.5 ml around the tonsil. Lidocaine was given intravenously. This restored sinus rhythm but the ST segments on his ECG were elevated. ST segments became normalized after intravenous nitroglycerin. However, pulmonary edema developed suddenly, and it was cured by intensive treatment. His ventricular tachycardia and hypertension after the local administration of epinephrine were presumably responsible for the acute heart failure causing the pulmonary edema. Our experience suggests that the maintenance of cardiac function and the reduction of afterload are important to overcome the circulatory disaster following the local infiltration of epinephrine.