Do gastric residual volumes correlate to increased risk of aspiration?

• A. Yes
• B. Not studied
• C. Sometimes
• D. No

Answer: (D)

The main point is that gastric residual volume does not reliably predict aspiration risk. GRV is just a momentary snapshot of what’s in the stomach and can be influenced by timing of measurement, recent feeds, medications, and gastric motility. Aspiration risk, however, hinges more on factors like airway protection, a patient’s level of consciousness or sedation, reflux or regurgitation events, and the integrity of swallowing mechanisms. Numerous studies have shown little consistent association between GRV thresholds and actual aspiration or pneumonia, so using a specific GRV value to guide feeding or to predict aspiration doesn’t reduce risk. In practice, routine GRV checks are not recommended as the primary means to prevent aspiration; monitoring for overall tolerance and other risk indicators is more informative. Some patients may have high GRV without aspiration, while others may aspirate with low GRV, illustrating the weak correlation.