手术前，医生使用琥珀酰胆碱来放松患者的肌肉。

Before the surgery, the doctor used ___succinylcholine to relax the patient's muscles.

手术前，医生给病人注射了琥珀胆碱以防止肌肉活动。

Before the surgery, the doctor administered ___succinylcholine to prevent muscle movement.