The aim of this study was to determine the effects of the 4-7-8 breathing technique on sleep quality, pain, and recovery quality in patients undergoing transurethral resection of the bladder (TUR-B). The population of the study will consist of patients who undergo TUR-B in the urology clinics of Tarsus State Hospital. In determining the sample size, the number of samples calculated based on the pain variable in reference studies was minimal; therefore, an effect size of 0.80, considered the upper limit, was taken as the basis. Using a power level of 90% and a two-tailed significance level (1-α), the calculation performed with G*Power (version 3.1) resulted in a minimum total sample size of 68 patients, with 34 patients in each group (study group = 34; control group = 34). Data in the study will be collected using the "Descriptive Characteristics Form," "Richard Campbell Sleep Questionnaire," "Quality of Recovery-15 Scale," and "Visual Analog Scale." When the researchers visit the patient, they will first provide the "Informed Consent Form" and then have the patient complete the "Descriptive Characteristics Form," "Richard Campbell Sleep Questionnaire," and "Quality of Recovery-15 Scale." The researcher will then learn from another researcher (MB), who will not be involved in data collection, which group the patient belongs to. Patients in the study group will be taught the 4-7-8 breathing technique by the researchers after their admission to the clinic. The patients will begin the application preoperatively and continue after returning to the clinic following the TUR-B procedure, starting from the 2nd hour after the effects of anesthesia have worn off. Initially, patients will be asked to perform the 4-7-8 breathing technique under the guidance of the researchers, and then continue the practice under researcher supervision. Subsequently, until discharge, patients will perform sets of four breaths every two hours. The control group will receive the routine postoperative procedures and care in the clinic. All patients will be assessed with the "Richard Campbell Sleep Questionnaire" and "Quality of Recovery-15 Scale" at the 24th hour postoperatively, and with the "Visual Analog Scale" at the 4th, 8th, 12th, and 24th postoperative hours.

The aim of this study was to determine the effects of the 4-7-8 breathing technique on sleep quality, pain, and recovery quality in patients undergoing transurethral resection of the bladder (TUR-B). The population of the study will consist of patients who undergo TUR-B in the urology clinics of Tarsus State Hospital. In determining the sample size, the number of samples calculated based on the pain variable in reference studies was minimal; therefore, an effect size of 0.80, considered the upper limit, was taken as the basis. Using a power level of 90% and a two-tailed significance level (1-α), the calculation performed with G*Power (version 3.1) resulted in a minimum total sample size of 68 patients, with 34 patients in each group (study group = 34; control group = 34).

Data in the study will be collected using the "Descriptive Characteristics Form," "Richard Campbell Sleep Questionnaire," "Quality of Recovery-15 Scale," and "Visual Analog Scale." When the researchers visit the patient, they will first provide the "Informed Consent Form" and then have the patient complete the "Descriptive Characteristics Form," "Richard Campbell Sleep Questionnaire," and "Quality of Recovery-15 Scale." The researcher will then learn from another researcher (MB), who will not be involved in data collection, which group the patient belongs to. Patients in the study group will be taught the 4-7-8 breathing technique by the researchers after their admission to the clinic. The patients will begin the application preoperatively and continue after returning to the clinic following the TUR-B procedure, starting from the 2nd hour after the effects of anesthesia have worn off. Initially, patients will be asked to perform the 4-7-8 breathing technique under the guidance of the researchers, and then continue the practice under researcher supervision. Subsequently, until discharge, patients will perform sets of four breaths every two hours. The control group will receive the routine postoperative procedures and care in the clinic. All patients will be assessed with the "Richard Campbell Sleep Questionnaire" and "Quality of Recovery-15 Scale" at the 24th hour postoperatively, and with the "Visual Analog Scale" at the 4th, 8th, 12th, and 24th postoperative hours.The data will be analyzed using a computer. Descriptive characteristics of the patients will be summarized as mean ± standard deviation, median (minimum-maximum), percentage, and frequency values. Qualitative data will be categorized and converted into quantitative data, and presented as percentages and frequency distributions. After examining the normality of the data distribution, the independent samples t-test will be used to compare continuous variables that show a normal distribution between two independent groups. For continuous variables that do not follow a normal distribution, group comparisons will be performed using the Mann-Whitney U test. A p-value of <0.05 will be considered statistically significant, with a 95% confidence interval.

Inclusion Criteria:

• Patients aged 18 years and older,
• Patients undergoing transurethral resection of the bladder (TUR-B),
• Patients who are conscious, oriented, and cooperative,
• Patients who provide written consent to participate in the study,
• Patients who stay in the hospital for at least one night postoperatively,
• Patients who speak and understand Turkish.

Exclusion Criteria:

• Patients who do not wish to participate or who withdraw from the study,
• Patients who develop complications during or after the surgical procedure,
• Patients who are followed in the intensive care unit postoperatively,
• Patients with chronic pain.

A total of 68 eligible patients will be randomly assigned to group A or B using a computer-generated randomization by an independent biostatistician. Group allocation (intervention vs. control) will be determined by coin toss. Assignment information will be placed in opaque envelopes and opened after obtaining informed consent. Participants cannot be blinded due to the 4-7-8 breathing intervention and post-TURB monitoring in shared rooms, but researchers will remain blinded to group allocation. Data will be analyzed by an independent biostatistician unaware of group assignments, ensuring blinding during analysis.