New study aims to spot hidden breathing muscle damage from heart procedure

This study looks at a possible side effect of a heart treatment called PFA for atrial fibrillation: injury to the phrenic nerve, which can paralyze part of the diaphragm and affect breathing. Patients get a special X-ray before and after the procedure to check diaphragm movement. If an issue is found, they are followed for up to a year. The study is purely observational and does not change standard care.