Preoperative physiological esophageal assessment for anti-reflux surgery: A guide for surgeons on high-resolution manometry and pH testing

Figure 12  Examples of straight leg raise testing during high-resolution manometry. A: Normal straight leg raise test with single pressurization zone; B: Two pressurization zones after straight leg raise indicating presence of small hiatal hernia; C: Example of two pressurization zones after straight leg raise in patient with large hiatal hernia (Arrows indicate pressurization zones).