Effect of Head and Neck Positioning on Lung Sliding in Healthy Volunteers

The goal of this clinical study is to learn how different head-of-bed positions affect lung movement during breathing in healthy adults. Researchers want to understand whether raising the head of the bed changes how the lungs move, which may help guide patient positioning in emergency and intensive care settings. The main questions this study aims to answer are: Does lung movement change when the head of the bed is positioned at zero, twenty, or forty degrees? Are there differences in lung movement between the right and left lungs? Are there differences between the upper (apical) and lower (basal) parts of the lungs? Participants will be healthy adult volunteers between eighteen and sixty years of age. Each participant will lie on a bed in three different positions: flat, with the head raised to twenty degrees, and with the head raised to forty degrees. During each position, researchers will use bedside lung ultrasound, a painless and non-invasive imaging method, to measure lung movement at four areas of the chest. No medications, injections, or invasive procedures will be used. This study may help health care providers better understand how body position affects breathing and support safer and more effective positioning of patients with breathing problems.

NCT Number	NCT07351201
Lead Sponsor	Ankara Etlik City Hospital
Conditions	Healthy
Enrollment	31 participants
Start Date	2026-01-20
Primary Completion	2026-02-20 (estimated)
Study Completion	2026-02-20 (estimated)
Updated on ClinicalTrials.gov	2026-03-02