Placement of pH probes during upper endoscopy: direct visualization is accurate.

BACKGROUND: Accurate catheter placement in children for esophageal pH monitoring is performed following an endoscopy using a mathematical formula followed by confirmatory radiograph. AIM: To determine if endoscopic visualization of the gastroesophageal junction can be used for sensor placement without the need for confirmatory radiograph. METHODS: Sixty-four catheters were placed using the Strobel formula method and 57 catheters were placed by visualization. RESULTS: With the formula method, 66% of children required probe adjustment compared with 7% when the probe was placed by direct visualization (p < .005). CONCLUSION: Placing pH sensors under direct visualization is accurate and reduces radiation exposure.