M-mode imaging of the diaphragm in phrenic nerve palsy due to birth trauma

A term infant was born at 39 weeks gestation by forceps vaginal delivery, and weighed 2500g. He received initial continuous positive airway pressure for two days, and was diagnosed with left sided Erbs palsy. He was discharged subsequently but readmitted 2 days later with increased work of breathing. His neurological examination was normal. Antibiotics were ceased after negative blood cultures. His chest radiograph (CXR) noted an elevated left hemi-diaphragm, and he was administered nasal high flow 8L/min but progressed to continuous positive airway pressure in view of increasing work of breathing.

source https://www.jpeds.com/article/S0022-3476(22)00291-8/fulltext?rss=yes