Figure 7 - Simultaneous readings of esophageal pH, muscle layer thickness, and manometric pressure in patients with heartburn.
From the following article
Robert Lee and Ravinder Mittal
GI Motility online (2006)
doi:10.1038/gimo75
Sustained esophageal contractions (SECs) detected by an increase in esophageal muscle thickness on high-frequency intraluminal ultrasound precede symptoms of heartburn in the absence of pathologic acid reflux detected on pH recording. (Source: Pehlivanov et al.,56 with permission from American Physiological Society.)
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