The aim of this study is to evaluate the effects of oral rinsing with water in the postoperative period on thirst, comfort level, and bowel motility in patients undergoing abdominal surgery under general anesthesia.

This study was conducted as a randomized controlled trial with pretest-posttest design, including intervention and control groups. It was carried out between June 2024 and December 2024 with patients undergoing elective abdominal surgery. Sample size was calculated using G*Power 3.1.9.7 software, with an effect size of 0.50, α=0.05, and power=0.85. A total of 82 participants (41 per group) were initially planned, and considering a 10% data loss, the study was completed with 98 participants (49 in each group). Patients were stratified according to their diagnoses and randomized in a 1:1 ratio using block randomization with a random number table.

Three data collection forms were used. SPSS 22.00 package program was used to analyze the data. Skewnes-Kurtosis analyses were performed to determine the conformity of the data to a normal distribution. Frequency (n) and percentage (%) distributions were calculated to determine the sociodemographic and clinical characteristics of the participants. A t-test for independent samples was used to determine the mean differences between two independent groups, a t-test for dependent samples was used to compare pre- and post-intervention measurements, and a single-factor analysis of variance (ANOVA) was used for repeated measures. Cohen's d effect size was calculated to assess the significance of the difference between the groups in terms of the intervention. Statistical significance was accepted as p<0.05.

Included Criteria

• To communicate,
• Aged 18 or older,
• Agreed to participate
• Scheduled for elective surgery.

Exclusion Criteria

• Over 80 years old,
• Had a mental disorder that prevented them from rinsing their mouth,
• Unconscious after surgery, were at
• Risk of swallowing water during rinsing,
• Underwent emergency surgery.

Refusion Criteria

• Refused to complete the post-test
• Intensive care after surgery

We plan to publish the study in an international journal.

data were collected for 6 months

This study used a stratified random sampling method. Patients were stratified by clinical diagnosis and gender and randomized into blocks. Using a random number table, the first patient to arrive was assigned to the experimental group, and subsequent patients were sampled using a 1:1 allocation method until strata and blocks were equal in both groups.