Two‐dimensional ultrasound imaging of the diaphragm: Quantitative values in normal subjects

Introduction : Real time ultrasound imaging of the diaphragm is an under‐used tool in the evaluation of patients with unexplained dyspnea or respiratory failure. Methods : We measured diaphragm thickness and the change in thickness that occurs with maximal inspiration in 150 normal subjects, with results stratified for age, gender, body mass index, and smoking history. Results : The lower limit of normal diaphragm thickness at end expiration or...