Effect of Box Breathing Technique on Anxiety, Pain, and Nausea in Patients Undergoing Endoscopic Retrograde Cholangiopancreatography (ERCP): A Randomized Controlled Trial

This single-center randomized controlled trial investigates the effectiveness of the box breathing technique on anxiety, pain, and nausea in patients undergoing endoscopic retrograde cholangiopancreatography (ERCP). The study is conducted in the gastroenterology clinic of a tertiary care hospital in Turkey.

Adult patients scheduled for ERCP who meet the inclusion criteria are enrolled and randomly assigned to either the intervention group or the control group using simple randomization. Patients in the intervention group receive standard pre-procedural care in addition to structured box breathing training provided by a nurse one day before the ERCP procedure. The box breathing technique involves four equal breathing phases: inhalation for four seconds, breath-holding for four seconds, exhalation for four seconds, and breath-holding again for four seconds. Participants are reminded to practice the technique approximately 30 minutes before the procedure and are encouraged to continue its use after ERCP.

Patients in the control group receive standard care only, without breathing training. Data are collected using validated instruments. Anxiety levels are measured using the State Anxiety Inventory (STAI), pain intensity is assessed using the Visual Analog Scale (VAS), and nausea, vomiting, and retching are evaluated using the Rhodes Index. Baseline measurements are obtained before the procedure, and follow-up assessments are completed within 24 hours after ERCP.

The primary outcome of the study is the change in anxiety levels. Secondary outcomes include pain intensity and nausea severity. This study aims to provide evidence on the effectiveness of a simple, non-invasive, and nurse-led breathing intervention to improve symptom management and patient comfort during invasive endoscopic procedures.