the last step is muscle relaxants substances that relax muscles and immobilize the patient. without these the body's protective reflexes could cause involuntary twitching even while under. who did it to please. and press. patients would suffocate without artificial ventilation. once anaesthesia has been induced patients must be kept under. as just an tissues prone to nausea she's receiving propofol as this causes nausea less frequently than volatile gaseous anesthetics. propofol can have other side effects such as drops in blood pressure or apnea. just in tissues now and responsive. but what does that actually mean if she is sleep is she unconscious.