Related Experiment Video
Updated: Jul 4, 2025
06:46
Simultaneous Laryngopharyngeal and Conventional Esophageal pH Monitoring
Published on: December 14, 2020
2.8K
Reflux definitions in esophageal multi-channel intraluminal impedance
Azra Rasouli1, Maryam Soheilipour2, Mostafa Raisi2
1Isfahan University of Medical Sciences, Isfahan, Iran.
Gastroenterology and Hepatology From Bed to Bench
|February 5, 2024
Summary
This study refines Multichannel Intraluminal Impedance-pH (MII-pH) monitoring by establishing consensus-based interpretations for reflux events, improving Gastroesophageal Reflux Disease diagnosis accuracy.
Area of Science:
- Gastroenterology
- Medical Devices
- Diagnostic Technology
Background:
- Multichannel Intraluminal Impedance-pH (MII-pH) monitoring is crucial for diagnosing Gastroesophageal Reflux Disease (GERD), especially in patients with persistent symptoms and normal endoscopy.
- Current interpretation of MII tracings for reflux events lacks standardized guidelines, impacting diagnostic reliability.
Purpose of the Study:
- To propose consensus-based interpretations for analyzing Multichannel Intraluminal Impedance (MII) data.
- To provide recommendations for reflux-related variables to enhance MII measurements for GERD diagnosis.
Main Methods:
- Reviewed over 200 reflux event episodes through multiple expert meetings.
- Developed a five-step process to categorize unresolved issues and establish technical principles for reflux event characterization.
Main Results:
- Defined liquid reflux as a 50% drop in baseline impedance, gas reflux as a >5 kΩ impedance increase, and mixed reflux based on temporal sequencing.
- Established baseline impedance calculation using a 60-second moving average for each channel.
Conclusions:
- Accurate detection of reflux events is vital for reliable GERD diagnosis, but current methods face technical limitations.
- The proposed consensus-based interpretation enhances the accuracy of MII measurements for GERD evaluation.
More Related Videos
Related Concept Videos
01:30Esophageal Strictures-I: Introduction
102
Esophageal strictures involve abnormal narrowing or tightening of the esophagus. They vary in length and severity, ranging from mild constriction to complete obstruction, and are classified as benign (noncancerous) or malignant (cancerous).
Etiology
The primary cause of esophageal strictures is long-standing gastroesophageal reflux disease (GERD), accounting for about 70 to 80% of adult cases. Chronic acid reflux can lead to injury and scarring of the esophageal lining, culminating in...
Etiology
The primary cause of esophageal strictures is long-standing gastroesophageal reflux disease (GERD), accounting for about 70 to 80% of adult cases. Chronic acid reflux can lead to injury and scarring of the esophageal lining, culminating in...
102
01:29Gastroesophageal Reflux Disease I: Meaning and Pathophysiology
318
Gastroesophageal Reflux Disease (GERD) involves the recurrent backflow of the stomach or duodenal contents into the esophagus, leading to troublesome symptoms and potential esophageal mucosal damage. Although GERD is often referred to as a disease, it is more accurately described as a syndrome, as it encompasses a range of symptoms and complications rather than a singular pathological entity, impacting a large number of individuals as the most prevalent upper gastrointestinal problem. Roughly...
318
01:29Gastroesophageal Reflux Disease II: Clinical Features and Management
86
Gastroesophageal reflux disease, or GERD, is a persistent medical condition that affects many individuals worldwide. Its clinical manifestations can vary greatly, making diagnosis and management challenging for healthcare professionals. The following is a comprehensive overview of the clinical manifestations, assessment, and management strategies for GERD.
Clinical Manifestations
GERD presents itself in a multitude of ways, with symptoms varying from person to person. The hallmark symptoms are...
Clinical Manifestations
GERD presents itself in a multitude of ways, with symptoms varying from person to person. The hallmark symptoms are...
86
01:23Impedances and Admittance
696
In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
696
01:29RLC Series Circuits: Impedance
2.1K
When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining the performance of AC circuits. It is represented by Z, which is a combination of resistance and reactance, and depends upon the angular frequency, measured in ohms.
Thus, the magnitude of the impedance is given by the following equation,
Thus, the magnitude of the impedance is given by the following equation,
2.1K
01:21Impedance Combination
436
Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the...
436