Dysphagia¶
Chapter 47 | Dysphagia: Clinical Evaluation and Management
KEY CLINICAL POINTS¶
- Dysphagia is difficulty swallowing, with severe cases compromising nutrition, causing aspiration, and reducing quality of life.
- Structural dysphagia involves physical obstruction (e.g., tumors, strictures), while propulsive dysphagia results from impaired peristalsis or sphincter dysfunction.
- The upper esophageal sphincter (UES) and lower esophageal sphincter (LES) are critical for coordinating swallowing, with dysfunction leading to aspiration or food impaction.
- Diagnostic evaluation includes fluoroscopy, endoscopy, and manometry to differentiate between structural, motor, and reflux-related causes.
- Management depends on etiology: pharmacologic (e.g., PPIs for GERD), surgical (e.g., Heller myotomy for achalasia), or dietary modifications.
1. DEFINITION & OVERVIEW¶
Dysphagia refers to difficulty in swallowing, encompassing problems with the transit of food/liquid from the mouth to the stomach. Severe cases may lead to malnutrition, aspiration pneumonia, and reduced quality of life. Terminology includes aphagia (complete obstruction), odynophagia (painful swallowing), globus pharyngeus (non-organic sensation), and phagophobia (fear of swallowing).
Classification of Dysphagia¶
| Type | Cause | Examples |
|---|---|---|
| Structural | Physical obstruction | Zenker’s diverticulum, peptic strictures, tumors |
| Propulsive | Impaired peristalsis/sphincter | Achalasia, diffuse esophageal spasm |
| Reflux-related | GERD/esophageal sensitivity | Schatzki rings, eosinophilic esophagitis |
| Neurogenic | Neurological deficits | Stroke, Parkinson’s, ALS |
1.1 Anatomy and Physiology of Swallowing¶
Swallowing involves three phases: oral (voluntary), pharyngeal (centrally mediated), and esophageal (peristaltic). The UES opens during swallowing via coordinated contraction of suprahyoid muscles and cessation of vagal stimulation. The LES relaxes in response to distension, allowing bolus entry into the stomach.
1.2 Classification of Dysphagia¶
Dysphagia is classified by location (oral, pharyngeal, esophageal) and etiology (structural, motor, reflux). Structural causes include strictures, tumors, and diverticula; motor causes involve impaired peristalsis or sphincter dysfunction (e.g., achalasia); reflux-related dysphagia is linked to GERD and esophageal sensitivity.
2. EPIDEMIOLOGY¶
Dysphagia affects 15-20% of adults, with higher prevalence in elderly populations. Risk factors include age-related degeneration, neurological disorders (e.g., stroke, Parkinson’s), GERD, and iatrogenic causes (e.g., radiation, surgery). Structural dysphagia is more common in elderly patients, while motor dysphagia is associated with neurodegenerative diseases.
2.1 Demographics¶
Incidence peaks in older adults ( ≥ 65 years). Zenker’s diverticulum is most common in elderly males; achalasia affects middle-aged adults. Eosinophilic esophagitis is prevalent in Caucasian males aged 20-40.
3. ETIOLOGY & PATHOPHYSIOLOGY¶
Dysphagia arises from structural, motor, or reflux-related mechanisms. The UES and LES dysfunction disrupts bolus transit. Striated muscle disorders (e.g., scleroderma) affect oropharyngeal and cervical esophagus, while smooth muscle disorders (e.g., GERD) impact thoracic esophagus and LES. Neurogenic causes include stroke, Parkinson’s, and ALS.
3.1 UES and LES Function¶
UES remains closed at rest due to cricopharyngeus muscle tone. During swallowing, vagal inhibition allows UES opening. LES relaxation is triggered by distension, with impaired relaxation seen in achalasia. Peristalsis in the distal esophagus is mediated by myenteric plexus, with excitatory and inhibitory neurons regulating contraction.
3.2 Pathophysiology of Specific Causes¶
Zenker’s diverticulum results from cricopharyngeus stenosis and Killian’s dehiscence. Achalasia involves absent LES relaxation and uncoordinated peristalsis. GERD causes esophageal hypersensitivity and mucosal damage, leading to dysphagia without strictures.
4. CLINICAL FEATURES¶
Symptoms include drooling, food impaction, regurgitation, and aspiration. Signs may involve hoarseness (recurrent laryngeal nerve compromise), dysarthria, or nasal regurgitation. Progressive dysphagia with solid/liquid involvement suggests neoplasia; intermittent dysphagia with solids may indicate structural causes (e.g., Schatzki rings).
4.1 Red Flags for Neoplasia¶
Progressive dysphagia worsening over weeks/months, association with weight loss, or history of head/neck cancer/radiation. Episodic dysphagia with no progression may indicate benign causes (e.g., Schatzki rings).
5. DIFFERENTIAL DIAGNOSIS¶
Differential diagnoses include structural causes (tumors, strictures), motor disorders (achalasia, myopathies), reflux (GERD), infections (Candida, HSV), and iatrogenic factors (radiation, surgery). Neurogenic causes (stroke, Parkinson’s) must be considered in patients with associated neurological deficits.
5.1 Structural vs. Functional Causes¶
Structural dysphagia presents with food impaction, regurgitation, or halitosis. Functional dysphagia (e.g., achalasia) is associated with absent peristalsis, prolonged swallowing, and ineffective LES relaxation.
6. INVESTIGATIONS & DIAGNOSIS¶
Diagnostic workup includes fluoroscopy (to assess peristalsis), endoscopy (to visualize structural abnormalities), and manometry (to evaluate LES function). pH monitoring may confirm GERD. Imaging (e.g., CT) is used for neoplasia or post-surgical stenosis.
Diagnostic Criteria for Dysphagia¶
| Feature | Structural | Propulsive | Reflux |
|---|---|---|---|
| Symptoms | Food impaction, regurgitation | Prolonged swallowing, ineffective clearance | Heartburn, dysphagia without strictures |
| Imaging | Barium swallow shows obstruction | Peristalsis abnormalities | Esophageal dilation with reflux |
| Endoscopy | Strictures, tumors, diverticula | Normal mucosa, absent peristalsis | Inflammation, erosions |
| Manometry | Normal LES function | Absent LES relaxation, uncoordinated contractions | Normal LES, hypersensitivity |
6.1 Diagnostic Algorithms¶
- Assess localization (oral/pharyngeal/esophageal) and consistency of dysphagia. 2. Use fluoroscopy to evaluate peristalsis and UES/LES function. 3. Endoscopy to identify structural causes (strictures, tumors). 4. Manometry for motor disorders (achalasia, DES). 5. pH monitoring for GERD.
7. MANAGEMENT & TREATMENT¶
Management is tailored to etiology: structural causes (surgery, dilation), motor disorders (myotomy, botulinum toxin), reflux (PPIs), and dietary modifications. Non-pharmacologic strategies include postural adjustments and swallowing therapy. Severe cases may require endoscopic interventions (e.g., sclerotherapy for strictures).
7.1 Pharmacologic Therapy¶
Proton pump inhibitors (PPIs) for GERD; anticholinergics for achalasia; corticosteroids for eosinophilic esophagitis. Opioids may exacerbate dysphagia and should be avoided.
7.2 Surgical Interventions¶
Heller myotomy for achalasia; cricopharyngeal myotomy for Zenker’s diverticulum; endoscopic dilation for strictures. Surgical stenosis may require resection or bypass.
8. PROGNOSIS & COMPLICATIONS¶
Prognosis depends on underlying cause: structural dysphagia may resolve with treatment, while neurogenic causes (e.g., ALS) are progressive. Complications include aspiration pneumonia, malnutrition, and dehydration. Early intervention improves outcomes, particularly in elderly patients.
8.1 Long-Term Outcomes¶
Neoplasms (e.g., esophageal cancer) have poor prognosis without early resection. Scleroderma-related dysphagia may improve with immunosuppression. GERD-related dysphagia is often managed with lifestyle changes and PPIs.
9. SPECIAL CONSIDERATIONS¶
In pregnancy, dysphagia may be due to hormonal changes or GERD. Pediatrics: congenital anomalies (e.g., esophageal atresia) require surgical correction. Elderly patients face higher risks of aspiration and require careful swallowing evaluation. Immunocompromised patients (e.g., HIV, cancer) are at risk for opportunistic infections (e.g., CMV, candidiasis).
9.1 Radiation and Chemotherapy¶
Radiation therapy for head/neck cancer may cause esophageal strictures or fibrosis. Chemotherapy-induced mucositis can lead to pill esophagitis, requiring prophylactic PPIs and hydration.
10. KEY POINTS & CLINICAL PEARLS¶
- Dysphagia localization (neck vs. chest) guides etiology: neck (oral/pharyngeal) vs. chest (esophageal). 2. Progressive dysphagia with solid/liquid involvement raises suspicion for neoplasia. 3. Fluoroscopy is essential for assessing peristalsis and sphincter function. 4. Endoscopy is the gold standard for structural evaluation. 5. Early intervention reduces complications like aspiration and malnutrition.