患者,女,15岁,第3次入院,诊断风湿性心脏病,二尖瓣狭窄及关闭不全,心力衰竭。于住院后第2天测循环时间,取乙醚0.3毫升加水0.7毫升,静脉内速注,测得臂至舌时间为10秒。当时患者有轻度不适感,但无其他反应。2～3分钟后,取7%硫酸镁5毫升静脉内快速注射,几秒钟后患者威到咽舌灼热,随即出现极度呼吸困 Patient, female, 15 years old, admitted to hospital for the third time, diagnosed with rheumatic heart disease, mitral stenosis and insufficiency, heart failure. On the second day after hospitalization, the cycle time was measured. 0.3 ml of diethyl ether and 0.7 ml of water were added, and an intravenous bolus injection was performed. The arm-to-tongue time was 10 seconds. At that time, patients had mild discomfort, but no other reaction. 2 to 3 minutes later, take 7% magnesium sulfate 5 ml intravenous rapid injection, a few seconds after the patient Wei to pharyngeal tongue burning, then there extreme sleepiness