牙关紧闭为一种临床症状，表现是上下牙列紧密闭锁，不能启动，以致患者不能开口，摄取食物以及说话极其困难，属中医“口噤”范畴。
口吐白沫，牙关紧闭，肌肉震颤，眼睑外露。
Frothing from mouth, jaw chomping, muscle tremors and eyelids snapping.
他仰卧着，牙关紧闭，右手紧握着拳头放在胸口上。
He lay on his back, his teeth set, his right hand clenched on his breast.
这种牙关紧闭的患者还可以增加发生恶性高热的可能。
Patients who develop trismus in association with the administration of succinylcholine may be susceptible to the subsequent development of malignant hyperthermia.
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