Clinical Guides
Achalasia
A clinically focused guide to diagnosing and managing adult achalasia in Indian practice, with explicit pseudoachalasia exclusion, manometric classification, procedure selection, post-treatment reflux care and evidence limits.
MedNext Academy | 12 min read
Achalasia
A clinically focused guide to diagnosing and managing adult achalasia in Indian practice, with explicit pseudoachalasia exclusion, manometric classification, procedure selection, post-treatment reflux care and evidence limits.
Summary
Achalasia is an uncommon primary oesophageal motor disorder defined physiologically by impaired relaxation of the oesophagogastric junction and absent normal peristalsis. Patients usually report progressive dysphagia to both liquids and solids, regurgitation of bland retained food or saliva, chest discomfort, nocturnal cough and weight loss. Symptoms alone are not diagnostic: upper gastrointestinal endoscopy is required to exclude a mechanical obstruction, especially malignancy-related pseudoachalasia, and high-resolution manometry is the diagnostic reference standard. A timed barium oesophagram provides complementary information about morphology and emptying. Chicago Classification subtypes help frame treatment, but phenotype, age, anatomy, previous therapy, local expertise, anaesthetic fitness and patient values all matter. Pneumatic dilation, laparoscopic Heller myotomy with partial fundoplication and peroral endoscopic myotomy are durable sphincter-disrupting options; type III disease often benefits from a longer tailored myotomy. Botulinum toxin is principally for people who cannot undergo definitive therapy. No intervention restores normal enteric innervation, so recurrence, retained oesophageal contents and reflux require longitudinal assessment. The guide is educational, not a patient-specific prescription. Evidence directly comparing procedures has heterogeneous endpoints and follow-up, while Indian access to manometry, therapeutic endoscopy and experienced surgery is uneven. A suspicious, rapidly progressive or late-onset presentation must never be labelled idiopathic achalasia until pseudoachalasia has been actively excluded.
How Common Is It?
Achalasia is rare, and numerical estimates vary with case definition, diagnostic technology and health-system access. The American College of Gastroenterology guideline describes reported incidence in the approximate range of one case per 100,000 people annually and prevalence of around ten per 100,000, but estimates from different populations should not be treated as an Indian national rate. Wider use of high-resolution manometry has improved recognition and subtype assignment, yet referral bias means tertiary-centre series cannot establish population prevalence. Achalasia can present at almost any adult age and affects all sexes; paediatric disease occurs but requires age-specific expertise beyond this adult guide. Because symptoms often evolve gradually, diagnosis may be delayed for years or misattributed to reflux, anxiety, poor chewing or a structural stricture. Conversely, dysphagia is common and achalasia is only one possible cause. In India, the denominator is particularly uncertain: diagnostic manometry is concentrated in larger centres, rural access is variable, and published single-centre cohorts are not nationally representative. The clinically useful lesson is therefore not to overstate frequency but to recognise the pattern early. Persistent dysphagia to liquids as well as solids, regurgitation of non-acidic material, unexplained weight loss or an oesophagus containing retained saliva at endoscopy should trigger a structured motility and obstruction work-up rather than repeated empirical acid suppression.
Risk Factors
Idiopathic achalasia usually has no modifiable initiating risk factor. Its pathology involves loss of inhibitory myenteric neurons, but why this occurs in an individual is generally unknown; proposed autoimmune, infectious and genetic mechanisms do not justify routine screening tests in otherwise typical adult disease. Family clustering is uncommon, and isolated achalasia should not be presented as a simple inherited disorder. Risk assessment is most valuable for identifying secondary achalasia-like syndromes and anticipating treatment harm. Older age at symptom onset, short symptom duration, marked or rapid weight loss, difficulty passing the endoscope across the junction, mucosal irregularity or disproportionate resistance should heighten concern for pseudoachalasia from gastric cardia or oesophageal cancer. Prior fundoplication, bariatric or junctional surgery can produce mechanical or functional outflow obstruction. Chagas disease is a recognised secondary cause in endemic exposure settings but is not an assumption in India; travel and residence history guide testing. Opioids can alter oesophageal motor patterns and should be documented before interpreting manometry. Aspiration risk rises with severe retention, nocturnal regurgitation, frailty or respiratory comorbidity. Procedural planning must also consider anticoagulants, cardiopulmonary fitness, portal hypertension, prior interventions and ability to return for follow-up. These are not causes of idiopathic disease, but they change investigation, consent and the balance among dilation, endoscopic myotomy and surgery.
Diagnosis
History
Ask whether dysphagia affects liquids from the outset as well as solids, whether it is intermittent or progressive, and whether manoeuvres such as drinking water or changing posture help. Record regurgitation, nocturnal cough, aspiration episodes, chest pain, heartburn, meal duration and quantified weight change. Establish the tempo: rapid deterioration over weeks or a brief history in an older adult is a pseudoachalasia warning. Document prior endoscopy, dilation, surgery, medicines including opioids, and cancer or Chagas exposure. The Eckardt score can structure symptom follow-up but does not establish diagnosis.
Examination
Physical findings may be absent. Assess hydration, body mass index, muscle loss, dentition and nutritional consequences. Look for cervical or supraclavicular nodes, abdominal mass, hepatomegaly, anaemia signs and respiratory features of aspiration. Examination is a safety and differential screen, not a substitute for testing.
Investigations
Perform upper gastrointestinal endoscopy in every suspected case to exclude tumour, peptic stricture, ring, eosinophilic disease and retained food; biopsy any abnormality. Failure to traverse the junction or strong clinical suspicion warrants cross-sectional imaging and often endoscopic ultrasonography with targeted tissue acquisition. High-resolution manometry confirms impaired junctional relaxation with absent normal peristalsis and classifies types I, II and III under Chicago criteria. Use protocol adequacy and clinical context because borderline outflow obstruction is not synonymous with achalasia. A timed barium oesophagram, ideally with objective column height and width and sometimes a tablet, assesses bird-beak narrowing, dilatation, sigmoid change and emptying. Baseline blood tests address nutrition or an alternative diagnosis but cannot confirm achalasia.
Differential Diagnosis
The central task is to distinguish primary achalasia from structural obstruction and other motility disorders. Oesophageal or gastric cardia cancer can infiltrate the junction and produce pseudoachalasia; clues include older onset, rapid progression, substantial weight loss, anaemia, mucosal abnormality and unusual resistance at endoscopy, but a visually normal mucosa does not completely exclude infiltrative disease. Repeat careful endoscopy, contrast-enhanced cross-sectional imaging and endoscopic ultrasonography are appropriate when concern remains. Benign peptic stricture, Schatzki ring, eosinophilic oesophagitis, postsurgical stenosis and extrinsic compression usually require endoscopic, histological or imaging clarification. Chicago Classification separates achalasia from oesophagogastric junction outflow obstruction, distal oesophageal spasm, hypercontractile oesophagus, absent contractility and inconclusive patterns; manometric labels must be linked to symptoms and supportive tests. Opioid-associated motor dysfunction may mimic spastic disease. Reflux commonly causes heartburn but does not usually cause simultaneous dysphagia to liquids and solids without a complication. Rumination and supragastric belching differ mechanistically from passive retention. Chagas-related megaoesophagus is clinically similar and depends on epidemiological exposure and serology. In regions where tuberculosis is common, mediastinal disease or malignancy may occasionally cause extrinsic compromise, but empirical antitubercular treatment is unsafe without evidence. Pseudoachalasia is the high-consequence miss: apparent manometric compatibility cannot override discordant clinical or endoscopic findings.
Management
First correct dehydration, malnutrition and aspiration risk, explain that treatment reduces junctional resistance rather than curing neuronal loss, and discuss all locally feasible definitive options in a multidisciplinary setting. For fit adults with type I or II achalasia, pneumatic dilation, laparoscopic Heller myotomy and peroral endoscopic myotomy can all provide effective relief when delivered by experienced teams. Type II often responds well across modalities. Type III requires adequate treatment of the spastic segment; peroral endoscopic myotomy or a tailored surgical myotomy is generally favoured over a short disruption, subject to expertise and informed choice. Pneumatic dilation must use a graded, protocolised approach with surgical rescue available because perforation is uncommon but potentially catastrophic. Heller myotomy is usually combined with a partial fundoplication to reduce reflux. Peroral endoscopic myotomy avoids abdominal incisions and permits a longer myotomy, but objective reflux is more frequent than after a myotomy with fundoplication, so reflux counselling and follow-up are integral. Botulinum toxin injection has lower durability and is reserved mainly for people unfit for definitive therapy; smooth-muscle relaxants provide limited, short-lived benefit and adverse effects. Persistent symptoms require objective reassessment rather than automatic repeat intervention: timed barium emptying, endoscopy and sometimes manometry can identify incomplete disruption, fibrosis, reflux stricture, sigmoid anatomy or another diagnosis. Selected end-stage megaoesophagus may need specialist oesophagectomy only after less invasive options and nutritional risk have been reviewed.
Prescribing Information
Medicines are adjuncts, not definitive treatment for most fit patients. Proton-pump inhibitors are used when reflux is documented or strongly suspected after myotomy or dilation, and many centres prescribe acid suppression after peroral endoscopic myotomy while arranging symptom and, where appropriate, objective reflux assessment. Choice, dose and duration should follow the individual reflux phenotype, renal and hepatic status, interacting medicines and local formulary; symptom absence does not reliably exclude acid exposure after myotomy. Botulinum toxin is delivered endoscopically into the lower oesophageal sphincter by a trained operator. Its effect commonly wanes, repeat treatment may be needed, and consent should cover limited durability and the possibility of fibrosis complicating later intervention. Oral nitrates or calcium-channel blockers may transiently lower sphincter pressure but can cause headache, hypotension, oedema or dizziness and are not substitutes for definitive care. There is no evidence-based role for prokinetics to restore absent peristalsis. Periprocedural antibiotics, antithrombotic interruption, fasting and post-procedure diet depend on the intervention and institutional protocol; they should not be copied from a generic guide. After any procedure, sudden chest or abdominal pain, fever, tachycardia, dyspnoea, haematemesis or subcutaneous emphysema demands urgent assessment for perforation, leak or bleeding. Medication advice must be reconciled at discharge and clearly separated from the mechanical treatment plan.
When to Refer
Refer suspected achalasia to gastroenterology for endoscopy and physiological testing rather than treating recurrent dysphagia empirically. Referral should be expedited when symptoms are progressive, weight is falling, regurgitation threatens aspiration, or the patient is older with a short history. A normal or non-diagnostic initial endoscopy does not end evaluation when liquid dysphagia persists. High-resolution manometry and an interpretable timed barium study are best coordinated through a centre that can integrate symptoms, imaging and motility findings. Once confirmed, discuss definitive treatment at a centre with audited expertise in the proposed modality. Peroral endoscopic myotomy, graded pneumatic dilation and laparoscopic Heller myotomy are operator-dependent and require access to complication management; availability alone is not a quality measure. Surgical consultation is essential where tumour cannot be excluded, anatomy is markedly dilated or sigmoid, previous therapy has failed, or oesophagectomy is being considered. Dietetic input is appropriate for significant weight loss, frailty or prolonged restricted intake, while respiratory review may be necessary after recurrent aspiration. After intervention, refer back promptly for recurrent dysphagia, food retention, refractory chest pain or reflux symptoms, and do not assume recurrence means the original procedure was technically inadequate. In India, referral pathways should specify where manometry, therapeutic endoscopy, upper gastrointestinal surgery, pathology and emergency rescue are actually available, with records and imaging transferred to avoid needless repetition.
Red Flags
Immediate or urgent assessment is required for inability to swallow saliva, complete food bolus obstruction, respiratory distress, aspiration pneumonia, severe dehydration, haematemesis, melaena or haemodynamic instability. Following dilation or myotomy, severe persistent chest, neck or abdominal pain, fever, tachycardia, dyspnoea, crepitus or sepsis may indicate perforation or leak and must trigger emergency imaging and specialist management. Before diagnosing primary achalasia, rapidly progressive dysphagia, pronounced weight loss, iron-deficiency anaemia, gastrointestinal bleeding, a palpable mass, lymphadenopathy or new symptoms in an older adult are malignancy warnings. An endoscope that does not pass easily, irregular cardia, ulceration or unexplained wall thickening requires biopsy and further imaging; negative superficial biopsies do not exclude submucosal infiltration. Recurrent nocturnal choking, fever or focal respiratory signs suggest aspiration. Marked oesophageal dilatation with retained food increases anaesthetic and aspiration risk and needs planned clearance and airway strategy before intervention. New severe reflux, odynophagia or dysphagia after therapy may reflect erosive injury, candidiasis, stricture or recurrent outflow obstruction rather than ordinary postoperative discomfort. Chest pain must still be evaluated for cardiac and pulmonary emergencies according to presentation. A rare-disease label should never narrow emergency reasoning: achalasia can coexist with cancer, coronary disease, infection and other structural pathology.
Indian Clinical Context
Indian care spans settings with very different access to endoscopy, high-resolution manometry, timed barium protocols, therapeutic endoscopy, upper gastrointestinal surgery and expert pathology. A safe pathway begins with structured dysphagia triage and high-quality diagnostic endoscopy, not with an assumption that every district can provide Chicago-classification manometry. Where manometry is unavailable, a barium study may support referral but should not be used to select irreversible therapy without adequate exclusion of malignancy and, wherever feasible, physiological confirmation. Patients travelling to a tertiary centre may face repeated fasting, accommodation costs and loss of wages; bundling endoscopy review, manometry, anaesthetic assessment and treatment counselling can reduce attrition. Procedure choice must not be driven solely by which private service is marketed locally. Centres should disclose experience, perforation rescue arrangements, likely reflux burden, follow-up plan and the possibility of retreatment. Pathology and cross-sectional imaging access are especially important when pseudoachalasia is suspected. Nutrition advice should use affordable local foods and safe consistencies while avoiding claims that diet treats the motor disorder. Discharge instructions should be provided in a language the patient understands, with a clear emergency contact and written guidance on fever, severe pain, breathlessness and bleeding. Indian prevalence and comparative cost-effectiveness data remain limited; international guideline recommendations therefore require contextual shared decision-making rather than uncritical transplantation.
NMC Competency Mapping
This topic integrates NMC undergraduate outcomes rather than replacing the official curriculum. SU28.5 covers applied anatomy and physiology of the oesophagus, while SU28.6 addresses clinical features, investigations and principles of management of benign and malignant oesophageal disorders; achalasia provides a direct benign motility case through which to apply both. A learner should take a structured history for dysphagia, distinguish oropharyngeal from oesophageal symptoms, recognise liquid-plus-solid dysphagia as a motility clue, examine for nutrition, malignancy and aspiration consequences, and construct an anatomical and physiological differential. The case supports interpretation of upper gastrointestinal endoscopy, contrast oesophagography and manometry at an appropriate undergraduate level, while preserving the rule that high-resolution manometry classification and advanced procedural decisions require specialist expertise. Communication outcomes include explaining uncertainty, obtaining informed consent in understandable language and discussing durable treatment versus temporary palliation. Professionalism includes not presenting botulinum injection or a commercial procedure as universally superior, not allowing a manometric label to obscure pseudoachalasia, and documenting red flags. Patient-safety learning includes aspiration prevention, safe fasting, recognition of perforation and escalation after an intervention. Defensible assessments test clinical reasoning, investigation sequencing, subtype implications and referral judgement; memorising device sizes, institutional drug regimens or an unverified local prevalence figure is not an appropriate national competency proxy.
Key Exam Pearls for NEET PG
Achalasia classically causes dysphagia to liquids and solids because the problem is motility, whereas an early fixed obstruction more often begins with solids; real presentations overlap, so this is a clue rather than a rule. High-resolution manometry is the diagnostic reference standard: all achalasia types lack normal peristalsis and show impaired junctional relaxation. Type I has minimal pressurisation, type II has panesophageal pressurisation, and type III has premature or spastic contractions; subtype affects therapeutic planning. A bird-beak appearance and retained barium on timed oesophagram support the diagnosis but do not exclude malignancy. Endoscopy is mandatory to rule out mechanical obstruction and pseudoachalasia. Rapid weight loss, late onset, a short history and difficulty crossing the junction should prompt renewed malignancy evaluation. Pneumatic dilation, Heller myotomy with partial fundoplication and peroral endoscopic myotomy are definitive options; botulinum toxin is mainly for patients unsuitable for them. Peroral endoscopic myotomy is particularly useful when a long myotomy is needed in type III, but post-procedure reflux is a major trade-off. Recurrent symptoms after treatment require objective testing because causes include incomplete myotomy, scarring, reflux stricture, progressive dilatation and another diagnosis. Achalasia treatment improves emptying by disrupting the sphincter; it does not restore normal oesophageal peristalsis. Evidence comparisons depend heavily on operator expertise, definitions of success and duration of follow-up, so an exam answer should match the clinical scenario rather than assert one procedure is always best.
Frequently Asked Questions
Can achalasia be diagnosed from a barium swallow alone?
No. A timed barium oesophagram can show delayed emptying, dilatation and distal bird-beak narrowing, but similar appearances can occur with mechanical obstruction. Upper endoscopy is needed to exclude structural disease, and high-resolution manometry is the diagnostic reference standard for confirming achalasia and assigning subtype. If clinical features suggest pseudoachalasia, cross-sectional imaging or endoscopic ultrasonography may be needed despite an apparently compatible barium study.
Which procedure is best for every patient with achalasia?
There is no single best procedure for everyone. Pneumatic dilation, laparoscopic Heller myotomy and peroral endoscopic myotomy are effective in appropriately selected patients and expert hands. Subtype, age, oesophageal anatomy, previous treatment, anaesthetic fitness, reflux priorities, local rescue capability and patient preference all matter. Type III disease often favours a longer tailored myotomy, while frail patients unable to undergo definitive treatment may receive botulinum toxin.
Does heartburn after achalasia treatment always mean acid reflux?
No. Heartburn-like discomfort may reflect true gastro-oesophageal reflux, fermentation of retained contents, hypersensitivity or recurrent obstruction. Symptoms alone correlate imperfectly with acid exposure after myotomy. Clinicians may use endoscopy and reflux monitoring according to severity and context, while timed barium emptying helps assess retention. Persistent symptoms should not lead to indefinite dose escalation or repeat myotomy without identifying the mechanism.
Why must pseudoachalasia be excluded urgently?
Cancer at the gastric cardia or distal oesophagus can obstruct or infiltrate the junction and imitate primary achalasia. Delay may postpone cancer staging and treatment. Rapid symptom progression, marked weight loss, older age at onset, anaemia, abnormal mucosa or difficulty passing the endoscope increase suspicion, but none is perfectly sensitive. Repeat endoscopic assessment, targeted biopsy, computed tomography and sometimes endoscopic ultrasonography are required when concern persists.
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