Which anesthesia helps you wake up smoother after spine surgery?

This trial tests three common anesthesia methods in adults having long spine surgery (over three hours) to see which one leads to the quickest and most comfortable recovery. The methods are total intravenous anesthesia (TIVA) alone, TIVA combined with sevoflurane, and TIVA combined with desflurane. Researchers will measure how fast patients wake up, how soon they can breathe on their own, and how quickly they leave the recovery room, as well as any nausea or agitation after surgery.