Unconsciousness,convulsion,cyanosis,apnea,drop of blood pressure,cardiac arrest may occur in some patients during the anesthetic injection in tonsillectomy. This complication was once regarded as primary shock,but with no conclusion.

• 扁桃体切除术普遍用局麻，少数病人在注射局麻药时突然发生意识丧失、惊厥、紫绀、呼吸停止、血压下降、甚至心跳停止而死亡等严重并发症。