A Study on Application of Adjustable Headrest in Painless Curettage Surgery for Overweight and Obese Patients

the supine head-lateral position group: during the perioperative period, keep the patient's head tilted to the left or right

the adjustable headrest group: placing an adjustable pillows on the patient's head to align the patient's external auditory canal horizontally with the sternum

the supine head-straight position group: during the perioperative period, keep the patient's head upright