Diagnosis and Management of PPI-Refractory GERD

Introduction to pH/Impedance Monitoring

The British Society of Gastroenterology recommends that patients with heartburn or regurgitation not responding to twice-daily PPIs should undergo pH/impedance monitoring to diagnose increased acid exposure, assess symptom-reflux association, and identify specific GERD phenotypes, with moderate quality evidence 1, 2
The American Gastroenterological Association (AGA) guidelines state that when troublesome heartburn and regurgitation do not respond adequately to a PPI trial, clinicians should perform prolonged wireless pH monitoring off medication to confirm and phenotype GERD or rule out GERD, particularly in the absence of severe erosive disease or long-segment Barrett's esophagus 3, 4, 5

The AGA guidelines favor testing off PPI to better establish the diagnosis and phenotype before considering surgical options, as it definitively confirms pathological GERD, identifies whether symptoms correlate with acid or non-acid reflux episodes, and helps to avoid misdiagnoses 1, 2, 3, 4, 5
Only 7% of patients with heartburn/regurgitation have persistent acid exposure on twice-daily PPIs, suggesting many "PPI failures" are actually misdiagnoses, according to the British Society of Gastroenterology 6

The AGA recommends optimizing PPI therapy first, ensuring twice-daily dosing for 4-8 weeks with proper timing, before proceeding to invasive testing 3, 4, 6
If symptoms persist after optimized PPI, perform pH/impedance monitoring off PPI (preferred) or on PPI (if severe erosive disease documented) to confirm pathological GERD and phenotype the reflux pattern 1, 2, 3, 4

Antireflux surgery should never be performed without objective confirmation of pathological GERD through pH/impedance monitoring, according to the AGA and British Society of Gastroenterology 1, 2, 4, 5
Candidacy for invasive anti-reflux procedures includes confirmatory evidence of pathologic GERD, exclusion of achalasia, and assessment of esophageal peristaltic function 4, 5

Do not proceed to surgery based on endoscopic findings alone, as even erosive esophagitis on endoscopy requires pH/impedance confirmation that reflux is causing current symptoms, according to the AGA and British Society of Gastroenterology 1, 2, 4, 5
Do not assume PPI failure equals surgical candidacy, as up to 75% of PPI-refractory patients have demonstrable pathological reflux on combined pH/impedance monitoring, but many have functional disorders or alternative diagnoses 6