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Effect of position on esophageal motility in a healthy subject. The esophageal contraction tends to be slower, better coordinated and more vigorous in the supine (left panels) than the upright, seated (right panels) position. As a consequence, the proportion of ineffective, hypotensive contractions is often higher in the upright position. Appropriate normative values must be applied. Image Courtesy of Digestive Function: Basel at Klinik Arlesheim
