If there is incomplete symptom relief on PPI therapy, which may be contributing factor?

• A. The patient is noncompliant
• B. Nonacid reflux may be a contributing factor
• C. The diagnosis may be incorrect
• D. The medication is not absorbed

Answer: (B)

When symptoms persist despite PPI therapy, the mechanism of reflux needs to be broadened beyond acid suppression. Proton pump inhibitors cut acid, but they don’t address reflux that isn’t acidic. Nonacid reflux can still provoke symptoms such as heartburn, regurgitation, or throat irritation even when acid levels are reduced. This is why nonacid reflux is a leading contributing factor for incomplete relief on PPI therapy—the therapy targets acidity, not the occurrence of reflux events themselves. If nonacid reflux is suspected, tests that monitor reflux regardless of pH (like impedance-pH monitoring) can help confirm it and guide next steps, such as adjusting therapy or exploring non-gastroesophageal causes.

Noncompliance could also cause limited relief, but the question points to a mechanism related to why acid suppression might fail to fully control symptoms. An incorrect diagnosis could explain ongoing symptoms in some cases, but it doesn’t specifically account for why PPI therapy wouldn’t fully relieve reflux-related symptoms. Absorption problems with the medication are less common and typically addressed by dosing considerations rather than indicating a common contributing factor.