24 hour pH impedance monitoring

24 hour pH impedance monitoring

The 24-hour pH impedance test is an outpatient procedure performed to measure the pH or amount of acid that flows into the esophagus from the stomach during a 24-hour period. The pH test is commonly used to help identify the cause of various symptoms, including heartburn, primarily in patients who have failed medical treatment and are candidates for surgery, and uncommon symptoms of GERD (gastroesophageal reflux disease), such as chest pain, chronic cough and asthma.

How is it performed?

 

The equipment used to monitor pH consists of a small probe that is inserted through the nose and positioned near the lower esophagus. The probe is plugged into a small unit (or monitor) worn on the patient’s belt or over their shoulder.The device has several buttons that help the patient record the occurrence of symptoms when they eat and lie down.

 

During the monitoring period of the test, the patient must:

  • record their primary symptoms
  • record the time when they start eating and finish eating, drinking anything except water, or when they start lying down and finish lying down

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