Esophageal Motility Disorders
High-yield NEET SS Surgery guide to esophageal motility disorders, high-resolution manometry, Chicago Classification v4.0, EGJOO, distal esophageal spasm, hypercontractile esophagus and ineffective esophageal motility.
1. Esophageal Motility Disorders: Overview
Esophageal motility disorders are abnormalities of esophageal contraction, peristalsis or esophagogastric junction relaxation that can cause dysphagia, regurgitation or non-cardiac chest pain.
High-resolution manometry (HRM) is the principal investigation for defining esophageal motor patterns.
Important disorders include EGJ outflow obstruction, absent contractility, distal esophageal spasm, hypercontractile esophagus and ineffective esophageal motility.
2. High-Resolution Manometry
HRM provides a pressure map of the esophagus and esophagogastric junction during swallowing.
What does HRM assess?
- EGJ relaxation
- Esophageal contractile vigor
- Peristaltic integrity
- Timing of distal contraction
- Patterns of pressurization
Chicago Classification uses these measurements to categorize esophageal motor disorders.
3. Chicago Classification v4.0
Chicago Classification v4.0 provides a standardized framework for interpreting esophageal HRM.
| Group | Important disorders |
|---|---|
| EGJ outflow disorders | Achalasia and EGJ outflow obstruction |
| Disorders of peristalsis | Absent contractility, distal esophageal spasm, hypercontractile esophagus and IEM |
CCv4.0 places greater emphasis on testing in both supine and upright positions and on supportive provocative or adjunctive testing when the initial HRM pattern is inconclusive.
4. Integrated Relaxation Pressure — IRP
IRP, or integrated relaxation pressure, evaluates relaxation of the esophagogastric junction after swallowing.
It is one of the most important branching points in Chicago Classification.
An elevated median IRP raises consideration of an EGJ outflow disorder. However, the exact threshold depends on the HRM system and patient position.
5. Distal Contractile Integral — DCI
DCI measures the vigor of esophageal contraction by incorporating the amplitude, duration and length of the distal esophageal contraction.
| DCI | Interpretation |
|---|---|
| <100 mmHg·s·cm | Failed peristalsis |
| 100 to <450 | Weak contraction |
| 450–8000 | Normal contractile vigor |
| >8000 | Hypercontractile swallow |
6. Distal Latency
Distal latency measures the timing of the distal esophageal contraction following swallow initiation.
A shortened distal latency indicates a premature contraction.
Therefore, when evaluating a possible spastic disorder, examine both distal latency and DCI.
7. EGJ Outflow Disorders
EGJ outflow disorders are characterized primarily by impaired relaxation or increased resistance at the esophagogastric junction.
The major entities in the Chicago Classification framework are:
- Achalasia
- Esophagogastric junction outflow obstruction (EGJOO)
EGJOO is particularly important because an elevated IRP can result from true functional obstruction, mechanical obstruction or technical/artifactual factors.
8. Disorders of Esophageal Peristalsis
Once a clinically significant EGJ outflow disorder has been excluded, attention shifts toward disorders of esophageal peristalsis.
| Disorder | Main HRM pattern |
|---|---|
| Absent contractility | Normal IRP + 100% failed peristalsis |
| Distal esophageal spasm | Normal IRP + ≥20% premature contractions |
| Hypercontractile esophagus | Normal IRP + ≥20% hypercontractile swallows |
| Ineffective esophageal motility | >70% ineffective swallows or ≥50% failed peristalsis |
Frequently Asked Questions
What is the main investigation for esophageal motility disorders?
High-resolution esophageal manometry is the principal test used to characterize esophageal motor function and classify motility disorders.
What is Chicago Classification?
Chicago Classification is a standardized framework for interpreting high-resolution esophageal manometry. Version 4.0 incorporates updated criteria and greater emphasis on clinical correlation and supportive testing.
What is EGJOO?
Esophagogastric junction outflow obstruction is a manometric pattern characterized by elevated EGJ relaxation pressure with preserved peristalsis that does not meet criteria for achalasia. CCv4.0 requires additional clinical and supportive information before considering EGJOO a clinically conclusive diagnosis.
What is distal esophageal spasm?
Distal esophageal spasm is characterized by premature distal esophageal contractions, with at least 20% premature contractions on HRM and appropriate clinical symptoms for a clinically relevant diagnosis.
What is hypercontractile esophagus?
Hypercontractile esophagus is characterized by at least 20% hypercontractile supine swallows, with DCI greater than 8000 mmHg·s·cm, along with compatible symptoms and exclusion of mechanical obstruction and other major disorders.
What is the CCv4.0 definition of IEM?
Conclusive ineffective esophageal motility requires more than 70% ineffective swallows or at least 50% failed peristalsis.
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This page is intended for medical education and examination preparation. It is not a substitute for clinical evaluation, specialist consultation, institutional protocols or professional medical advice.