How to Interpret High-Resolution Manometry in Postoperative Patients

High-resolution manometry (HRM) is valuable after oesophageal surgery, but postoperative results require more clinical context than a standard motility study. Altered anatomy, changed pressure relationships and surgical wraps can produce findings that resemble primary achalasia, outflow obstruction or ineffective motility.

The most reliable interpretation combines the operation performed, the patient’s current symptoms, endoscopic findings and the complete manometric tracing. A report should explain whether an abnormal pressure pattern is expected after surgery, clinically significant, or suggestive of a treatable complication.

This is particularly relevant in Australia, where patients may move between public hospitals, private gastroenterology clinics and metropolitan referral centres in Sydney, Melbourne, Brisbane or Perth. Clear reporting supports continuity of care across these settings and helps surgeons, gastroenterologists and speech pathologists use the results appropriately.

Establish The Surgical Anatomy

Begin by documenting the procedure and its timing. A Heller myotomy, peroral endoscopic myotomy, fundoplication, oesophagectomy, gastric pull-up or bariatric operation can alter the lower oesophageal sphincter (LOS), gastric anatomy and position of the pressure sensors. The interpretation should state whether the catheter passed smoothly and whether the expected landmarks were identifiable.

After fundoplication, increased integrated relaxation pressure (IRP) may reflect resistance from the wrap rather than true achalasia. A tight or slipped wrap can create dysphagia, regurgitation and elevated intrabolus pressure. Following oesophagectomy, the normal oesophagogastric junction may no longer exist, so conventional Chicago Classification thresholds may have limited relevance.

Review the operative note, endoscopy and contrast imaging when available. A timed barium swallow can show retention or a mechanical narrowing that HRM alone cannot distinguish from functional obstruction.

Confirm Technical Quality Before Diagnosis

Check the resting pressure, respiratory inversion point, catheter position and quality of the gastric reference signal. Postoperative anatomy can make transnasal placement difficult, especially when there is angulation, a hiatal repair or altered gastric position. Failed passage into the stomach should be reported rather than silently treated as an abnormal LOS measurement.

Assess the study for coughing, swallowing artefact, catheter movement and incomplete test meals. Supine and upright positions may produce different results, so the patient’s position must be recorded. Multiple rapid swallows and a rapid drink challenge can expose impaired peristaltic reserve or persistent outflow resistance, provided the patient can perform them safely.

In Australian practice, access to advanced motility testing may vary between a tertiary public service and a private clinic. A technically limited study should be referred for specialist review rather than used to justify an invasive procedure without corroborating evidence.

Interpret Pressure Patterns In Context

Use the latest locally adopted Chicago Classification framework, while recognising that postoperative patients may fall outside its validated populations. Elevated IRP with preserved peristalsis can indicate oesophagogastric junction outflow obstruction, but it may also result from a fundoplication, opioid use, catheter position or impaired relaxation caused by pain and anxiety.

Absent contractility after myotomy may be expected, whereas panesophageal pressurisation, failed peristalsis or repetitive contractions may carry different implications. Examine the contraction pattern, distal contractile integral, distal latency, intrabolus pressure and bolus clearance together. A single abnormal metric should not determine the diagnosis.

Symptoms help define clinical importance. Dysphagia for solids suggests mechanical resistance, while difficulty with both liquids and solids may support a motility disorder. Regurgitation, chest pain, weight loss and nocturnal symptoms should prompt assessment for reflux, aspiration, recurrence or structural narrowing. Opioids prescribed after surgery can also impair oesophageal body function and LOS relaxation.

Link Manometry To Multidisciplinary Care

HRM findings are most useful when discussed alongside endoscopy, biopsy results, CT, contrast studies and nutrition assessment. A patient with persistent dysphagia after cancer surgery may need evaluation for recurrence, anastomotic stricture or functional obstruction rather than an isolated motility label. Multidisciplinary review is especially important when symptoms and test findings conflict.

A virtual tumour board can help coordinate complex postoperative cases across Australia’s dispersed health system; guidance on virtual tumour boards is relevant when surgeons, oncologists, radiologists and gastroenterologists cannot meet in person. Patient consent, secure platforms and appropriate handling of health information should follow the Privacy Act 1988 and local hospital policy.

Management may include endoscopic dilatation, wrap revision, botulinum toxin, pneumatic dilatation or repeat myotomy, but treatment should follow confirmation of the underlying mechanism. The Therapeutic Goods Administration framework and hospital medication protocols also matter when pharmacological options such as smooth-muscle relaxants are considered.

Practical Reporting Recommendations

A useful report should distinguish measured abnormalities from their likely explanation. It should identify uncertainty clearly, especially when the operation has changed the normal oesophagogastric junction.

• State the operation, reconstruction and interval since surgery.
• Confirm catheter position, test conditions and whether gastric landmarks were obtained.
• Report supine and upright IRP, peristaltic pattern and provocative-test results.
• Describe intrabolus pressure, pressurisation and evidence of impaired bolus clearance.
• Explain whether findings may reflect a wrap, stricture, altered anatomy or primary motility disorder.
• Correlate the result with dysphagia pattern, reflux symptoms, medications and imaging.
• Recommend targeted multidisciplinary review when the manometric diagnosis is uncertain.

Avoid reporting “achalasia” or “outflow obstruction” without qualifying the postoperative setting. A phrase such as “elevated IRP with preserved peristalsis, potentially related to fundoplication; correlate with endoscopy and timed contrast imaging” is more clinically useful than an unqualified diagnostic label.

Australian patients may also face long travel distances from regional areas to specialist centres, making a precise first report especially important. Including the raw study summary, relevant surgical history and specific next investigations can reduce repeat appointments and support coordinated care.

The final interpretation should answer three practical questions: is there evidence of impaired emptying, is the abnormality mechanical or functional, and does it explain the patient’s symptoms? The next step is to review the operative report, endoscopy and HRM tracing together before assigning a definitive postoperative motility diagnosis.