To investigate the responsiveness of sonographic parameters to detect change in Borg score for dyspnea during hospitalisation for AECOPD without respiratory acidosis, we propose a prospective cohort design.~After inclusion, participants will have assessment of diaphragm function (excursion, thickness, thickening fraction) using ultrasound within 48 hours of admission to the emergency ward, striving to assessment within 24 hours of admission. Additionally, dyspnea grade will be assessed using validated questionnaires.~Further diagnostic work-up and treatment for AECOPD is performed at the discretion of the treating physician.~Both ultrasound measurements and dyspnea grade questionnaires will be repeated when the participant is reported suitable for hospital discharge by the treating physician.
The study will be conducted as a single-center, prospective cohort study. The primary objective of this study is to investigate the responsiveness of sonographic parameters of diaphragm to detect change in Borg score for dyspnea during hospitalisation for AECOPD without respiratory acidosis.