Diaphragmatic Motion Using Linear Ultrasound

A linear 10-12 MHz ultrasound probe will be used to determine diaphragmatic excursion, by examining the zone of apposition. Diaphragmatic excursion will be measured from end inspiration to end expiration. The measurement will be repeated twice, and an average of the two will be taken. The distance between the two external skin markings, one at the end of full expiration and one at the end of full inspiration will indicate the excursion of the diaphragm.

A curvilinear 2-5 MHz ultrasound probe will be used to determine diaphragmatic excursion, by examining the dome of the diaphragm. M-mode will be used to image the motion of the diaphragm from end inspiration to end expiration. The measurement will be repeated twice, and an average of the two will be taken.

Bedside pulmonary function tests to measure forced vital capacity (FVC). The FVC measures the maximal volume of gas that can be expired as forcefully and rapidly as possible after a maximal inspiration to total lung capacity. This measurement will help determine if the patient has any obstructive or restrictive diseases of the airways. Three measurements will be taken.