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“Comparison of Three Methods Used in the Diagnosis of Extraesophageal Reflux in Children with Chronic Otitis Media with Effusion”
September 20, 2017
“Laryngopharyngeal Reflux (LPR) in Patients with Persistent Hoarseness”
September 20, 2017

Regenbogen E, Oleszak S, Corrado T, et al. Otolaryngology. 2015 Jul;5:202.

OBJECTIVES: While laryngeal injuries are important and not infrequent following both short and extended endotracheal tube exposure, little detailed information is available regarding the hypopharyngeal environment during intubation. The objective of this pilot study was to explore a simple method of accurately documenting hypopharyngeal pH values in surgical patients undergoing endotracheal tube anesthesia and to report the findings.

RESULTS: No complications associated with the pH monitoring system occurred. Median pH was 6.5 (range 6.0-7.0); median recorded time in minutes was 183.9 (range 130.7 – 323.5). 13/20 patients had pH>5.0 ≤ 5.5 events, for up to 113 minutes of monitored time; 2/20 patients had pH>4.0 ≤ 5.0 events, for up to 8 minutes of monitored time; 2/20 patients had pH ≤ 4.0 events, for up to 61 minutes of monitored time.

CONCLUSION: The hypopharyngeal pH test was used successfully to intra-operatively record hypopharyngeal pH variations. Extended pharyngeal exposures to low pH environments were commonly documented. No associations were found with patient survey scores. Future research appears warranted to expand this study, identify “at-risk” populations and to rigorously evaluate an expanded set of voice-related and lower airway clinical outcomes measures.

 

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