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Measurements of the diaphragmatic excursion (DE) and systolic velocity by the ultrasound. During inspiration, the diaphragm contracts and moves toward the probe. During expiration, the diaphragm rebounds and moves away from the probe. The distance between them on the vertical axis during a respiratory cycle was recorded as the diaphragmatic excursion. For systolic velocity, it was equivalent to DE/time of inspiratory time.
