Cranberry juice flush is considered not to be a research-based method to restore patency because it has which of the following characteristics?

• A. There is insufficient evidence supporting its effectiveness
• B. It is more effective than water
• C. It damages the tube
• D. It is the standard of care

Answer: (B)

When evaluating methods to restore patency, what matters is solid, high-quality evidence showing that the method works and is safe. Cranberry juice flush is not considered research-based because there isn’t robust, well-designed research demonstrating a real, consistent benefit. The statement that it is more effective than water would require clear, reproducible comparative trials; without that level of evidence, such a claim cannot justify use in practice. In other words, lacking strong evidence means it’s not an evidence-based approach, regardless of any anecdotal impressions.