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Related Concept Videos

Indicators02:39

Indicators

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
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Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

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Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
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Esophageal varices are dilated, tortuous veins which are found mainly in the submucosa of the lower esophagus but which may also appear higher up or extend into the stomach. They develop due to increased pressure in the portal venous system, often as a result of liver cirrhosis. This condition scars and damages the liver, impeding normal blood flow through the portal vein. To compensate, blood seeks alternative pathways, forming fragile new vessels (varices) in the esophagus and stomach. These...
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R chart, or range chart, is a fundamental tool in statistical process control used to monitor the variability within a process. It complements the X-bar (x̄) chart by focusing on the range of the data, rather than individual values, providing a clear picture of the process dispersion over time.
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Run charts, essentially line graphs plotted over time, serve as fundamental yet effective tools for process analysis. They chronicle data sequentially, facilitating the identification of trends, shifts, or cyclical movements. This graphical representation is instrumental in determining whether a process is stable or exhibits signs of potential instability indicative of special cause variation. In the healthcare domain, run charts depict infection rates over time, enabling hospitals to monitor...
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Related Experiment Video

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Functional Characterization and Visualization of Esophageal Fibroblasts Using Organoid Co-Cultures
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Indications and interpretation of esophageal function testing.

C Prakash Gyawali1, Nicola de Bortoli2, John Clarke3

  • 1Department of Medicine, Division of Gastroenterology, Washington University School of Medicine, St. Louis, Missouri.

Annals of the New York Academy of Sciences
|May 14, 2018
PubMed
Summary

Esophageal symptoms require diagnostic testing for proper management. This review details esophageal high-resolution manometry (HRM) and reflux monitoring, guiding clinicians in evaluating motility and GERD.

Keywords:
ambulatory pH monitoringbarium radiographyfunctional lumen imaging probehigh-resolution manometrypH-impedance monitoring

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Area of Science:

  • Gastroenterology and Esophageal Diagnostics

Background:

  • Esophageal symptoms have diverse origins, including mucosal, motor, functional, and neoplastic causes.
  • Effective management hinges on accurate diagnosis through appropriate testing.
  • Recent guidelines offer frameworks for interpreting esophageal function tests.

Purpose of the Study:

  • To review the indications, techniques, and interpretation of esophageal high-resolution manometry (HRM) and ambulatory reflux monitoring.
  • To discuss the role of these tests in evaluating common esophageal symptoms.
  • To highlight alternative diagnostic options for esophageal conditions.

Main Methods:

  • Focus on esophageal high-resolution manometry (HRM) and ambulatory pH or pH-impedance monitoring.
  • Incorporate recent consensus guidelines, including the Chicago Classification and Lyon Consensus.
  • Discuss indications, technique, equipment, and interpretation of HRM and reflux monitoring.

Main Results:

  • Esophageal HRM aids in diagnosing motility disorders.
  • Ambulatory reflux monitoring, guided by the Lyon Consensus, provides conclusive evidence for GERD diagnosis.
  • These tests help define mechanisms of esophageal symptoms and direct management.

Conclusions:

  • High-resolution manometry and ambulatory reflux monitoring are crucial for diagnosing esophageal motility disorders and GERD.
  • Understanding these advanced diagnostic tools and recent guidelines improves patient care.
  • Judicious use of these tests is key to defining esophageal symptom etiology and guiding treatment.