Do dermatomyositis and polymyositis affect similar thigh muscles?
Compared with PM, DM affects more thigh muscles, except those of the posterior compartment, which are equally involved in both disorders. These findings may be useful to target physiotherapy at the more frequently affected muscles.
Reflux of duodenal juice in gastroesophageal reflux disease is more common than pH studies alone would suggest. The combined reflux of gastric and duodenal juices causes severe esophageal mucosal damage. The vast majority of duodenal reflux occurs at a pH range of 4 to 7, at which bile acids, the major component of duodenal juice, are capable of damaging the esophageal mucosa.