Linda Martinez60 said:I’m wondering when exactly they pull the intubation tube out? Like, once the surgery wraps up, do they just take it out and wait for the patient to wake up? And can you breathe on your own (without the tube) if the anesthesia is still really kicking in?
Also, how many hours after the surgery does the anesthetic stay in your system so there isn't any pain?
ACL surgery
An intubation tube is basically a tube placed into the trachea (windpipe) through the mouth or nose via orotracheal or nasotracheal intubation for patients undergoing general endotracheal anesthesia (GEA).
The tube has three main jobs:
to ensure a secure airway during the period of anesthesia,
to allow for normal lung ventilation (whether the patient is breathing on their own or being assisted by the anesthesia machine),
and to protect the airway from aspirating stomach contents (which is super important).
During a procedure under GEA, the anesthesiologist keeps the patient asleep while ventilating them using the anesthesia machine, where a specific mix of gases is set. So, during this type of anesthesia, the patient isn't actually inhaling air, but rather a combo of oxygen, nitrous oxide, and inhaled anesthetics (usually something like isoflurane or sevoflurane these days). If needed, they’ll also add muscle relaxants, narcotics, analgesics, and so on...
Toward the end of the surgery, the anesthesiologist adjusts the settings on the machine, stops the flow of anesthetic agents, and starts ventilating the patient with pure oxygen. At roughly the same time, they give the patient an IV combination of meds to reverse the effects of the muscle relaxants (decurarization). By watching the ventilation parameters on the monitor and observing the patient clinically, they look for signs of spontaneous breathing and the first signs of waking up. The patient still has the tube in and is connected to the machine at this point. Once it’s determined that the patient is achieving enough tidal volume through spontaneous breathing, their level of alertness is good, and there aren't any other red flags, the anesthesiologist decides to perform extubation (pulling the tube). The patient stays under the watchful eye of the anesthesia team for a bit, usually in the Post-Anesthesia Care Unit (PACU), which most American hospitals have. Here, their breathing and overall status are closely monitored, and they get help if they need it. After a while, the patient is re-evaluated, and if the anesthesiologist thinks everything looks solid, they move the patient back to a regular hospital room.
It is actually possible to do the whole anesthesia process without a tube (using a mask instead). This method requires more focus and skill from the anesthesia team and is typically used for shorter procedures. Basically, by adjusting the dosage of the anesthetic and avoiding muscle relaxants (which always require a tube), they reach the necessary depth of anesthesia while the patient continues to breathe on their own. So, the anesthesia "holds" as long as the patient can breathe independently.😁
Pain is a super individual thing, so there’s no one-size-fits-all answer here. If it starts hurting, don't feel bad about speaking up and asking for pain meds. An ACL repair will most likely be done using regional anesthesia rather than general. You should definitely chat with your anesthesiologist about those options before the big day.