JNM : Review ; Evaluation of Esophageal Motor Function With High-resolution Manometry

( Jeffrey L Conklin ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.3

For several decades esophageal manometry has been the test of choice to evaluate disorders of esophageal motor function. The recent introduction of high-resolution manometry for the study of esophageal motor function simplified performance of esophageal manometry, and revealed previously unidentified patterns of normal and abnormal esophageal motor function. Presentation of pressure data as color contour plots or esophageal pressure topography led to the development of new tools for analyzing and classifying esophageal motor patterns. The current standard and still developing approach to do this is the Chicago classification. While this methodical approach is improving our diagnosis of esophageal motor disorders, it currently does not address all motor abnormalities. We will explore the Chicago classification and disorders that it does not address. (J Neurogastroenterol Motil 2013; 19:281-294)

Non-cardiac Chest Pain : Too Hot to Handle, a Tight Squeeze, Nonsense or Off the Wall

Conklin, Jeffrey L. 대한소화관운동학회 2000 Journal of Neurogastroenterology and Motility (JNM Vol.6 No.1

Generation of Nitric Oxide in the Opossum Lower Esophageal Sphincter during Physiological Experimentation

이세준,박효진,장진혁,Jeffrey L Conklin 연세대학교의과대학 2006 Yonsei medical journal Vol.47 No.2

Lipopolysaccharide (LPS), given in vivo, modulates opossum esophageal motor functions by inducing the inducible nitric oxide synthase (iNOS), which increases nitric oxide (NO) production. Superoxide, a NO scavenger, is generated during this endotoxemia. Superoxide is cleared by superoxide dismutase (SOD) and catalase (CAT) to protect the physiological function of NO. This study examined whether lower esophageal sphincter (LES) motility, NO release, and iNOS and nitrotyrosine accumulation in the LES are affected by LPS in vitro. Muscle strips from the opossum LES were placed in tissue baths containing oxygenated Krebs buffer. NO release was measured with a chemiluminescence NOx analyzer, and Western blots were performed to analyze iNOS and nitrotyrosine production. The percent change in resting LES tone after a 6-hour exposure to LPS was significantly increased compared to pretreatment values. The percent LES relaxation upon electrical stimulation was significantly decreased in the control group at 6 hours, indicating that the LPS treatment had an effect. The NO concentration in the tissue bath of LPS- treated muscle without nerve stimulation was significantly less than that of LPS treatment combined with SOD/CAT or SOD/CAT alone. iNOS and nitrotyrosine were detectable and increased over time in the LES muscle of both the control and LPS-treated groups. Antioxidant enzymes may play a role in regulating NO-mediated neuromuscular functions in the LES.

Recorded Lower Esophageal Pressures as a Function of Electronic Sleeve Placement and Location of Gastric Pressure Measurement in Patients With Hiatal Hernia

( Benjamin Basseri ),( Mark Pimentel ),( Christopher Chang ),( Edy E Soffer ),( Jeffrey L Conklin ) 대한소화기기능성질환·운동학회 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.4

In high-resolution manometry lower esophageal sphincter pressure (LESP) is measured relative to intragastric pressure, however Gastric MarkerTM (GM) location used to determine resting LESP is not well established with hiatal hernia (HH). We test the hypothesis that measured resting LESP varies with HH based on GM location. Methods Subjects with HH ≥ 2 cm were included. The eSleeveTM was adjusted to span only the LES, excluding the crural diaphragm (CD). Resting LESP was determined by placing the GM below and above the CD (in the position yielding the highest resting LESP). Resting pressure across the lower esophageal sphincter (LES) to CD and pressure in the HH relative to subdiaphragmatic intragastric pressure were also measured. Results HH ≥ 2 cm was present in 98 patients (mean length 2.7 cm). LESP decreased when GM was moved from below the CD into the HH: respiratory minimum LESP 7.5 ± 1.1 to 3.6 ± 0.9 mmHg; P < 0.001, mean LESP 17.7 ± 1.3 to 13.7 ± 1.1 mmHg; P < 0.001. When the eSleeve encompassed the LES and CD, the respiratory minimum pressure was 12.2 ± 0.9 mmHg and mean pressure was 23.9 ± 1.0 mmHg pressure (P < 0.001 for both). Pressure in the hernia pouch was greater than intragastric pressure: respiratory minimum 3.0 ± 0.7 mmHg and mean 9.0 ± 0.8 mmHg (P < 0.001 for both). pH studies showed a trend toward an association between abnormal distal esophagus acid exposure and lower resting LESP. Conclusions GM placement in the HH produces lower resting LESPs. This may provide a more physiologic representation of LESP in HH. (J Neurogastroenterol Motil 2013;19:479-484)

Clinical Characteristics of Patients with Untreated Achalasia

( Han Ho Jeon ),( Jie-hyun Kim ),( Young Hoon Youn ),( Hyojin Park ),( Jeffrey L Conklin ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.3

Background/Aims Patients with untreated achalasia frequently complain of heartburn and regurgitation. The diagnosis of achalasia might be delayed because these symptoms are misinterpreted as gastroesophageal reflux. We aim to evaluate the clinical, radiologic, and manometric findings in patient with untreated achalasia. Methods The records of patients diagnosed with primary achalasia between July 2004 and January 2012 at Gangnam Severance Hospital, Seoul, Korea were evaluated. We reviewed their clinical history and the findings of barium esophagogram, upper gastrointestinal endoscopy, and esophageal transit scintigraphy. We also compared the clinical, radiologic, and manometric findings of patients according to heartburn symptoms and proton pump inhibitor use. Results Our study included a total of 64 patients with a median age of 44.5 (interquartile range, 31.5-54.0). The median duration of symptoms was 23.5 (interquartile range, 5.3-57.0) months. Sixty-four patients (100%) had dysphagia, 49 (76.6%) had regurgitation, 35 (54.7%) had chest pain, and 38 (59.4%) had heartburn. Typical clinical features of gastroesophageal reflux disease (GERD) such as regurgitation, heartburn, and chest pain were observed in more than 50% of achalasia patients. Proton pump inhibitors were prescribed for 16 patients (25%) on the assumption that they had GERD. Patients with heartburn were more likely to experience weight loss (P = 0.009), regurgitation (P = 0.001), or chest pain (P = 0.019). Conclusions Heartburn, regurgitation, and chest pain were commonly observed in patients with untreated achalasia. Therefore, these findings suggest that achalasia should be suspected in patients with refractory GERD. (J Neurogastroenterol Motil 2017;23:378-384)

Relationship Between Intestinal Gas and the Development of Right Colonic Diverticula

( Sang In Lee ),( Jie Hyun Kim ),( Hyo Jin Park ),( Sung Ill Jang ),( Young Hoon Youn ),( Jeffrey L Conklin ) 대한소화관운동학회 2010 Journal of Neurogastroenterology and Motility (JNM Vol.16 No.4

Backgrounds/Aims High intraluminal pressure has been reported to cause left colonic diverticula. However, the pathophysiology of right colonic diverticula is still unclear. Methane gas has been reported to delay small intestinal transit and to increase intraluminal pressure. The aim of this study was to evaluate the relationship between right colonic diverticula and intestinal gas produced by enteric bacteria. Methods Lactulose breath tests were performed in 30 patients who were diagnosed with right colonic diverticula via colonoscopy. The control group consisted of 30 healthy adults with no specific symptoms or medical histories. A hydrogen or methane producer was defined in 2 ways: either one that exhibited a breath hydrogen level ≥20 ppm (methane ≥10 ppm) baseline or one that exhibited an increase in breath hydrogen ≥20 ppm (methane ≥10 ppm) above baseline within the first 90 minutes of the test. Results The lactulose breath test (LBT) positivity in the diverticular group and the control group were 40.0% and 33.3%, respectively, without a statistically significant difference. The concentrations of methane and hydrogen gas measured by LBT increased over time, but there was no significant difference between the control and the diverticular groups. Conclusions There was no significant relationship between right colonic diverticula and intestinal gases produced by enteric bacteria. However, time-dependent formation of diverticula should be taken into consideration, therefore long-term, large-scale follow- up studies may reveal further pathogenesis of right colonic diverticulosis. (J Neurogastroenterol Motil 2010;16:418-423)