Thank you for the question.
It is very common for patients to have anxiety regarding anesthesia necessary for plastic surgical procedures. In reality general anesthesia provided by a board-certified anesthesiologist in a fully accredited surgery center or hospital is extremely safe.
in regards to the question, anesthesiologists titrate the intravenous medications and inhalant agents in relation to progress of surgery. In other words, as a surgical procedure comes to a conclusion these agents are weaned off. The anesthesiologists will also use medications to “reverse” the effects of agents previously used.
Again, teamwork is important to allow the anesthesiologist to titrate the amount of anesthesia necessary (not too much or too little) to provide a safe and comfortable experience for the patient.
I hope this helps.