Anesthesiologist Questions Anesthesia

What happens when anesthesia fails?

I'm assuming anesthesia doesn't work all the time for some patients. So, what happens when anesthesia fails to work during surgery? Is it possible for this to happen?

2 Answers

This is not supposed to happen. Before the surgeon starts, he does a test to ensure the anesthesia is adequate. Also, we use a device called BIS that measures the depth of anesthesia.
In case of regional anesthesia, we also do tests. If a failure occurs with regional anesthesia, then could switch to geta.
Normally, this is not true. When you say anesthesia, you are talking close to 40 different anesthetics drugs. It may true that patients could be resistant to one, but then you could switch to another drug. Also, dose is different among patients. At all times, anesthesiologists monitor brain functions and cardiac function to ensure proper depth of anesthesia. On rare occasions, people have recall during surgery, but most happen from either error or bad drug. BIS is monitoring of brainwave finding patient is completely asleep and unconscious.