High-resolution manometry (HRM) is the gold-standard technique for assessing esophageal motility. By using up to 36 closely spaced pressure sensors and advanced software, HRM generates color‐coded esophageal pressure topography (EPT) plots, enabling precise diagnosis of motility disorders per the Chicago Classification v3.0.

Indications

HRM is indicated for:

  • Non‐obstructive dysphagia or unexplained swallowing difficulty.

  • Preoperative evaluation before anti‐reflux surgery

  • Non‐cardiac chest pain or regurgitation with normal endoscopy

  • Post‐intervention assessment, e.g., after achalasia treatment

  • Rumination syndrome and supragastric belching (with impedance)[35–37]

Equipment & Catheter Types

  • Solid‐state sensors: durable, accurate; no perfusion needed.

  • Water‐perfused sensors: require calibration and continuous irrigation.

  • Both span from hypopharynx to 3–5 cm below the diaphragm.

Standard HRM Protocol

  1. Patient Preparation:

    • NPO ≥ 4 h prior; medications withheld if possible.

    • Explain transnasal catheter placement and potential gagging.

  2. Catheter Placement:

    • Transnasal insertion under topical anesthetic; position distal sensors below diaphragm.

  3. Baseline Recording:

    • 30 s resting period to identify landmarks:

      • Upper esophageal sphincter (UES)

      • Pressure inversion point (PIP)

      • Esophagogastric junction (EGJ) morphology (types I–III)

  4. Swallow Series:

    • Ten 5 mL water swallows in supine (or seated) position; report patient posture[11–14].

    • Minimum of seven swallows acceptable for interpretation.

Key HRM Metrics

Assessment Metric Normal Range Abnormal Finding
EGJ relaxation Integrated Relaxation Pressure (IRP) ≤ 15 mmHg > 15 mmHg: outflow obstruction (Sierra system)
Contractile vigor Distal Contractile Integral (DCI) 450–8,000 mmHg·s·cm < 450: weak peristalsis; > 8,000: hypercontractile
Propagation timing Distal latency (DL) > 4.5 s < 4.5 s: premature/spastic contraction
Peristaltic integrity 20 mmHg isobaric break < 5 cm ≥ 5 cm: fragmented swallow
Pressurization pattern 30 mmHg isobaric pressurization Absent Panesophageal: type II achalasia; compartmentalized: distal obstruction

Normal Reference Values

Parameter 5th–95th Percentile
UES resting pressure 34.6–137.7 mmHg
4 s IRP (SS-HRM) 0–14.5 mmHg
Distal Contractile Integral 178–2,828 mmHg·s·cm
Contractile front velocity 2.9–5.9 cm/s
Distal latency 5.4–8.5 s
Transition zone length 0–8.2 cm

Interpretation—Chicago Classification v3.0

  1. Assess EGJ Outflow: median IRP

    • If elevated, categorize into:

      • Type I achalasia: absent peristalsis, no pressurization

      • Type II achalasia: panesophageal pressurization ≥ 20% swallows

      • Type III achalasia: ≥ 20% premature swallows

      • EGJ outflow obstruction: does not meet achalasia criteria

  2. Major Disorders (normal IRP):

    • Distal esophageal spasm, hypercontractile (jackhammer) esophagus, absent contractility

  3. Minor Disorders:

    • Ineffective esophageal motility (> 50% ineffective swallows)

    • Fragmented peristalsis (> 50% fragmented swallows)

Provocative and Advanced Applications

  • Multiple rapid swallows (MRS): assess peristaltic reserve

  • Rapid drink challenge (200 mL): unmask subtle obstruction

  • Impedance integration (HRIM): simultaneous bolus transit and pressure assessment, rumination/belching evaluation[35–37]

  • EGJ Contractile Integral: quantifies barrier function pre/post anti‐reflux surgery

Patient Preparation & Aftercare

  • Before: NPO, medication review, informed consent.

  • During: Monitor comfort; reposition if artifacts detected.

  • After: Observe for transient nasal bleeding or discomfort.

  • Report should include: indication, final diagnosis with classification, summary and tabulated metrics, technical limitations, and communication plan.

High-resolution manometry provides unparalleled accuracy in diagnosing esophageal motility disorders, guiding therapeutic decisions, and evaluating surgical outcomes. Proper protocol adherence and competency in interpretation are essential to maximize clinical benefit.

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