The goal of this clinical trial is to learn which positioning strategy works better to prevent postoperative hypoxemia in surgical patients: semirecumbent positioning or lateral positioning. It will also learn about the safety and effectiveness of these two positioning approaches. The main questions it aims to answer are:

Does semirecumbent positioning reduce the incidence of postoperative hypoxemia more effectively than lateral positioning? Does lateral positioning reduce the incidence of postoperative hypoxemia more effectively than semirecumbent positioning? What are the differences in patient comfort and recovery outcomes between these two positioning strategies? Researchers will compare semirecumbent positioning directly to lateral positioning to see which approach is more effective in preventing postoperative hypoxemia.

Participants will:

Be randomly assigned to either semirecumbent positioning or lateral positioning after surgery Have their oxygen levels and breathing monitored regularly during the postoperative period Receive standard post-surgical care with their assigned positioning strategy Be assessed for comfort levels and any positioning-related complications Have their recovery progress tracked throughout their hospital stay.

Inclusion Criteria:

• Patients aged 18 or above and 80 or below who received general anesthesia and intubation

Exclusion Criteria:

Inclusion criteria:

- Patients aged 18 years and above, and 80 years and below, who received general anesthesia and intubation;

Exclusion criteria:

• Presence of hypotension or bradycardia upon entering the anesthesia recovery room;
• Preoperative hypoxemia;
• Surgical procedures where body position adjustment is not possible or is prohibited due to the nature of the surgery;
• Surgical procedures involving severe cardiovascular or cerebrovascular diseases, severe pulmonary diseases, intracranial hypertension, etc.;
• Intubation more than 3 times.