Comparison of the Effects of Single Dose Preemptive Paracetamol or Ibuprofen Administration Before Septrorhinoplasty on Intra- and Postoperative Opioid Consumption.

Our study will be prospective, observational, and conducted through face-to-face interviews with patients at the Ear, Nose, and Throat Operating Room, Anesthesiology and Reanimation Clinic of Samsun University, Samsun Training and Research Hospital. The study is planned to begin on November 1, 2025, and be completed by August 31, 2026. The study will be conducted by Dr. Hasan CETINKAYA and Dr. Hatice SELCUK KUSDERCI.

Sample size calculation for data analysis was based on data from a reference study (Alshehri AA, Int Arch Otorhinolaryngol. 2023;27(3):e471-e477) evaluating the effect of preemptive analgesic agents on opioid consumption after septorhinoplasty surgery. In the reference study, total opioid consumption (mg) was reported as mean ± standard deviation as 486.4 ± 40.84 mg in Group A, 410.2 ± 88.41 mg in Group B, and 372.8 ± 90.45 mg in Group C. The pooled standard deviation calculated from these values was 76.8 mg, and the Cohen's f effect size was obtained as 0.615 based on the differences between the group means. Using G*Power 3.1 software, a priori power analysis was performed for one-way ANOVA (one-way fixed effects omnibus) with parameters α = 0.05, power (1-β) = 0.95, and number of groups = 3. The minimum total sample size was calculated as 45 (15 participants per group). In our study, the planned sample size was increased to compensate for potential losses and omissions. This aimed to achieve the expected effect size (f = 0.615) and 95% statistical power at the determined significance level.

Statistical analysis: The data obtained in the research will be analyzed using IBM SPSS Statistics (version 25.0 or higher) software. All data will first be summarized with descriptive statistics, expressing mean ± standard deviation or median (min-max) values for continuous variables, and number and percentage (%) for categorical variables. The distribution characteristics of the data will be evaluated using the Shapiro-Wilk test for intergroup comparisons. One-way analysis of variance (ANOVA) will be used for continuous variables showing a normal distribution; when a significant difference is found, the Tukey HSD post-hoc test will be applied for intragroup pairwise comparisons. For variables not showing a normal distribution, the Kruskal-Wallis test will be preferred; when a difference is found, pairwise comparisons will be made using the Mann-Whitney U test with Dunn-Bonferroni correction. Differences between categorical variables will be evaluated using the Chi-square test (χ²) or, if the expected frequency is insufficient, Fisher's Exact test. For measurements repeated over time (e.g., postoperative pain scores, analgesic consumption, etc.), Repeated Measures ANOVA or, in the case of non-parametric measurements, the Friedman test will be used.

The study will include ASA 1-2 volunteer male and female patients over 18 years of age who will undergo elective septorhinoplasty surgery. Inclusion criteria:

• Septorhinoplasty surgery
• ASA 1-2 patients
• Men and women aged 18-65
• Informed consent and agreement to participate in the study Exclusion criteria: - ASA 3-4 and under 18 years of age
• Patients with serious renal, hepatological, cardiovascular, and pulmonary system diseases
• Patients allergic to paracetamol or ibuprofen
• Patients with bleeding diathesis, platelet dysfunction, gastrointestinal disease, peptic ulcer, pregnancy, planning pregnancy, and breastfeeding mothers
• Patients with ASA and those using anticoagulants Patients included in our study will be randomly assigned to three groups based on the preemptively administered medication using a computer-assisted randomization system by a blind investigator.