Maternal respiratory function following normal vaginal delivery

Thoracic epidural analgesia or patient-controlled local analgesia for radical retropubic prostatectomy: a randomized, double-blind study

“…P Emax has been shown to be an indirect, but objective, measure of pain intensity after abdominal surgery: low pain intensity implies that the patient can generate a greater expiratory effort and achieve higher P Emax values and vice versa. 18…”