Gentler breathing during bypass may protect the diaphragm

This study looked at whether using low tidal volume (gentle) breathing during heart bypass surgery helps preserve diaphragm movement and reduce lung problems after surgery. Sixty adults having planned coronary bypass surgery were randomly assigned to receive either gentle breathing or no breathing (standard care) while on the heart-lung machine. Researchers measured diaphragm motion with ultrasound and tracked complications like collapsed lung, fluid buildup, and pneumonia.