A wireless device that measures the acidity of stomach contents backwashed into the esophagus allows patients to avoid some of the nose pain and throat discomfort// associated with the conventional wired monitor used to manage hard-to-treat gastroesophageal reflux disease.

However, while the new technology appears be better tolerated, no studies showed that it was better for diagnosing or managing these patients, said David Mark, M.D., lead author of a new review of evidence on wireless esophageal pH monitoring for gastroesophageal reflux disease, or GERD.

The systematic review was conducted by the Blue Cross and Blue Shield Association's Technology Evaluation Center, which analyzes clinical and scientific evidence to evaluate whether a technology improves health outcomes.

Physicians turn to pH monitoring — wireless or wired — for patients who have not responded to standard GERD therapy. The procedure is also used in preoperative evaluation to choose patients who will benefit most from surgery.

"After our survey of all the ways this wireless device has been studied, basically we can conclude that it was more comfortable than the wired device, that the diagnostic capacity of the wired and wireless devices seem to be similar and that there's no evidence that 48 hours was better than 24 hours," said Mark, associate director of the Technology Evaluation Center.

In conventional pH monitoring, a probe attached to a catheter is snaked through the nose and down the throat to the esophagus, the tube that carries food from the throat to the stomach. The probe and wires typically stay in place for 24 hours to send back information to a portable data recorder worn by the patient. A specialist analyzes that information to learn how often caustic stomach acid flows into the esophagus.

"You're talking about a device that's kind of unsightly for the day that you are using it, and it's definitely irritating to y
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