Established and Novel Methods to Assess GERD: An Update.

Background: Gastroesophageal reflux disease (GERD) is common. Management of reflux symptoms includes medical and nonmedical interventions. Proton pump inhibitors (PPIs) continue to be considered first-line agents. Standard investigations to diagnose GERD include upper endoscopy, impedance-pH measurement or capsule-based pH measurements and high-resolution manometry. However, diagnosis can sometimes be difficult in individual cases when measurements yield borderline results. Combination of the three mentioned techniques is considered the diagnostic gold standard now. Summary: Aside from the current measures considered gold standard, new measurement parameters, mostly focusing on impedance of the esophageal mucosa will help better diagnose GERD. Another promising new modality is the combination of wireless pH measurements and evaluation of esophageal motility and structural abnormalities using the endoscopic functional lumen imaging probe (FLIP). Artificial intelligence may play an increasingly supportive role. Key Messages: GERD needs to be better diagnosed to avoid unnecessary or potentially harmful long-term acid suppression therapy or reflux surgery. A number of tools is under investigation. However, as of now they only have supportive value.