Figure 8 - Example of esophagopharyngeal regurgitation captured during prolonged manometric and dual pH recording.

The sleeve sensor that was monitoring LES pressure has slipped into the stomach; hence, no recording of LES pressure is visible. However, during a period of prolonged esophageal acidification, this example clearly shows a spontaneous (non–swallow-related) UES relaxation, which mediates pharyngeal acidification.