TY - JOUR
T1 - Four-dimensional impedance manometry derived from esophageal high-resolution impedance-manometry studies
T2 - a novel analysis paradigm
AU - Kou, Wenjun
AU - Carlson, Dustin A.
AU - Patankar, Neelesh A.
AU - Kahrilas, Peter J.
AU - Pandolfino, John E.
N1 - Funding Information:
The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by P01 DK117824 (JEP) from the Public Health service.
PY - 2020
Y1 - 2020
N2 - Background: This study aimed to introduce a novel analysis paradigm, referred to as 4-dimensional (4D) manometry based on biophysical analysis; 4D manometry enables the visualization of luminal geometry of the esophagus and esophagogastric junction (EGJ) using high-resolution-impedance-manometry (HRIM) data. Methods: HRIM studies from two asymptomatic controls and one type-I achalasia patient were analyzed. Concomitant fluoroscopy images from one control subject were used to validate the calculated temporal-spatial luminal radius and time-history of intraluminal bolus volume and movement. EGJ analysis computed diameter threshold for emptying, emptying time, flow rate, and distensibility index (DI), which were compared with bolus flow time (BFT) analysis. Results: For normal control, calculated volumes for 5 ml swallows were 4.1 ml–6.7 ml; for 30 ml swallows 21.3 ml–21.8 ml. With type-I achalasia, >4 ml of intraesophageal bolus residual was present both pre- and post-swallow. The four phases of bolus transit were clearly illustrated on the time-history of bolus movement, correlating well with the fluoroscopic images. In the control subjects, the EGJ diameter threshold for emptying was 8 mm for 5 ml swallows and 10 mm for 30 ml swallows; emptying time was 1.2–2.2 s for 5 ml swallows (BFT was 0.3–3 s) and 3.25–3.75 s for 30 ml swallows; DI was 2.4–3.4 mm2/mmHg for 5 ml swallows and 4.2–4.6 mm2/mmHg for 30 ml swallows. Conclusions: The 4D manometry system facilitates a comprehensive characterization of dynamic esophageal bolus transit with concurrent luminal morphology and pressure from conventional HRIM measurements. Calculations of flow rate and wall distensibility provide novel measures of EGJ functionality.
AB - Background: This study aimed to introduce a novel analysis paradigm, referred to as 4-dimensional (4D) manometry based on biophysical analysis; 4D manometry enables the visualization of luminal geometry of the esophagus and esophagogastric junction (EGJ) using high-resolution-impedance-manometry (HRIM) data. Methods: HRIM studies from two asymptomatic controls and one type-I achalasia patient were analyzed. Concomitant fluoroscopy images from one control subject were used to validate the calculated temporal-spatial luminal radius and time-history of intraluminal bolus volume and movement. EGJ analysis computed diameter threshold for emptying, emptying time, flow rate, and distensibility index (DI), which were compared with bolus flow time (BFT) analysis. Results: For normal control, calculated volumes for 5 ml swallows were 4.1 ml–6.7 ml; for 30 ml swallows 21.3 ml–21.8 ml. With type-I achalasia, >4 ml of intraesophageal bolus residual was present both pre- and post-swallow. The four phases of bolus transit were clearly illustrated on the time-history of bolus movement, correlating well with the fluoroscopic images. In the control subjects, the EGJ diameter threshold for emptying was 8 mm for 5 ml swallows and 10 mm for 30 ml swallows; emptying time was 1.2–2.2 s for 5 ml swallows (BFT was 0.3–3 s) and 3.25–3.75 s for 30 ml swallows; DI was 2.4–3.4 mm2/mmHg for 5 ml swallows and 4.2–4.6 mm2/mmHg for 30 ml swallows. Conclusions: The 4D manometry system facilitates a comprehensive characterization of dynamic esophageal bolus transit with concurrent luminal morphology and pressure from conventional HRIM measurements. Calculations of flow rate and wall distensibility provide novel measures of EGJ functionality.
KW - 4D manometry
KW - esophageal manometry
KW - esophagus
KW - intraluminal impedance
KW - peristalsis
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U2 - 10.1177/1756284820969050
DO - 10.1177/1756284820969050
M3 - Article
C2 - 33178334
AN - SCOPUS:85093970826
VL - 13
JO - Therapeutic Advances in Gastroenterology
JF - Therapeutic Advances in Gastroenterology
SN - 1756-283X
ER -