This observational study aims to evaluate the relationship between menstrual cycle phases and the incidence of postoperative nausea and vomiting (PONV) in women of reproductive age undergoing septorhinoplasty surgery. The study's primary objective is to determine whether different phases of the menstrual cycle are associated with variations in PONV frequency. As a secondary objective, the relationship between menstrual phases, PONV incidence, and the use of sugammadex during anesthesia will be analyzed. No additional intervention will be applied beyond routine clinical practice; all data will be collected prospectively from anesthesia records and postoperative evaluations.

This clinical trial aims to evaluate the effect of menstrual cycle phases on the incidence of postoperative nausea and vomiting (PONV) in women of reproductive age undergoing septorhinoplasty under general anesthesia. PONV is a common postoperative complication that can negatively impact patient recovery, prolong discharge time from the post-anesthesia care unit, and decrease overall patient satisfaction. Several risk factors for PONV have been identified, and recent consensus guidelines published in 2020 have also suggested that the menstrual cycle may influence PONV risk.

In this prospective observentional study, participants will be randomly assigned to receive either preoperative nebulized lidocaine or nebulized 3% sodium chloride solution, administered 15 minutes before surgery. The primary objective is to determine whether menstrual cycle phase (follicular, ovulatory, or luteal) is associated with differences in PONV incidence. The secondary objective is to evaluate whether the use of sugammadex during anesthesia has an additional effect on PONV occurrence across different menstrual phases.

Sugammadex, a modified γ-cyclodextrin that selectively binds aminosteroidal neuromuscular blocking agents such as rocuronium, may also interact with endogenous steroid hormones. Pharmacokinetic studies have shown that sugammadex exposure can decrease progesterone levels by approximately 34% and may reduce estrogen levels as well. Given the hormonal fluctuations during the menstrual cycle, understanding these interactions may help identify specific phases associated with increased PONV risk and support the development of individualized anesthesia management strategies.

All participants will receive standard anesthetic and surgical care. PONV assessment will be performed in the postoperative care unit and during the first 24 hours after surgery. Demographic data, anesthetic drug information, menstrual cycle phase, and PONV outcomes will be recorded and statistically analyzed.

The results of this trial may contribute to improved understanding of the interaction between hormonal status, anesthetic drugs, and postoperative outcomes, potentially informing future preventive measures for PONV in women undergoing elective surgery.

Inclusion Criteria:

• Female sex
• Age between 18 and 40 years
• Regular menstrual cycle
• Scheduled for ENT (ear, nose, and throat) surgery
• Classified as ASA physical status I or II

Exclusion Criteria:

• Irregular menstrual cycle
• Unknown date of last menstrual period
• Receiving estrogen and/or progesterone supplementation
• Pre-menopausal or menopausal status
• Pregnant
• Breastfeeding
• Classified as ASA physical status III or IV
• Apfel score ≥ 3
• History of drug allergy
• Surgery duration exceeding 3 hours
• Age <18 or >40 years

female

The study population consists of women of reproductive age (18-40 years) who are scheduled to undergo septorhinoplasty surgery under general anesthesia. Eligible participants have a regular menstrual cycle and are classified as ASA physical status I or II. Participants with irregular menstrual cycles, unknown last menstrual period, pre-menopausal or menopausal status, or those receiving hormonal supplementation are excluded. Other exclusion criteria include pregnancy, breastfeeding, ASA III-IV status, high risk for postoperative nausea and vomiting (Apfel score ≥3), history of drug allergy, and surgery duration exceeding 3 hours. Data will be collected prospectively from anesthesia records, postoperative assessments, and standardized questionnaires evaluating postoperative nausea and vomiting (PONV).

This study will not share individual participant data. Data will be collected and analyzed solely for research purposes and will remain confidential in accordance with institutional and ethical guidelines.