Disfagia

What is dysphagia?

Dysphagia is defined as difficulty in swallowing. It is usually associated either with pharyngeal or oesophageal disease.¹ There is a spectrum of possible aetiologies (see links in table under Aetiology, below), from self-limiting illness (for example, tonsillitis) to carcinoma. It may occur with odynophagia - painful swallowing.

• As well as the feeling of food sticking in the gullet, patients with oesophageal disease may have other symptoms. These range from discomfort to severe pain, with the patient nearly always unable to locate the obstruction accurately.

• Regurgitation, vomiting, coughing and choking are common.

• Men with new onset of alarm symptoms (loss of weight with worsening dysphagia) have an increased likelihood of a diagnosis of cancer, especially in those aged over 65.² A positive predictive value of 9.0% has been found in this age group.

• The most common lesions within the oesophagus are inflammatory strictures from reflux or tumours.

• A long history of heartburn is usually associated with an inflammatory stricture.

• In Westernised countries, eosinophilic oesophagitis is thought to affect between 40 and 55 per 100,000 population - similar to the numbers affected by Crohn's disease.³

• Idiopathic achalasia presents with dysphagia for solids and also regurgitation of a bland-tasting material that has never entered the stomach. It occurs in 1-2/100,000, most commonly seen in mid-adult life, and is caused by impaired neural control of the distal oesophagus.⁴

• Impairment of oropharyngeal swallowing function and abnormal laryngeal findings have been noted in patients with severe COVID-19 treated in intensive care units.⁵

Obstructive

• Gastro-oesophageal reflux ± stricture.

• Esofagite eosinofílica.

• Other oesophagitis (for example, infection).

• Câncer de esôfago.

• Câncer gástrico.

• Câncer faríngeo.

• Post-cricoid web (Paterson-Brown-Kelly syndrome).

• Oesophageal rings.

• Foreign body (acute).

Neurológico

• Acidente vascular cerebral or brain injury.

• Acalasia.

• Diffuse oesophageal spasm.

• Syringomyelia or bulbar palsy.

• Miastenia gravis.

• Esclerose múltipla.

• Doença do neurônio motor.

• Myopathy (dermatomyositis, myotonic dystrophy).

• Doença de Parkinson and other degenerative disorders.

• Chagas disease (American trypanosomiasis).

Outros

• Bolsa faríngea.

• Sensação de globo.

• External compression (for example, mediastinal tumour, or associated with cervical spondylosis).

• Calcinosis, Doença de Raynaud, (o)esophageal dysmotility, sclerodactyly, telangiectasia (CREST) syndrome or esclerodermia.

• Oesophageal amyloidosis.

• Inflammation - for example, tonsillitis, laryngitis.

• FBC and erythrocyte sedimentation rate (ESR) should be taken.

• Barium swallow and/or endoscopy with biopsy should usually be performed.

• Laryngoscopic examination may be helpful if a pharyngeal cause is suspected.

• In patients with severe COVID-19, the swallowing function should be assessed as a standard procedure, preferably at an early stage, before initiation of oral intake. Fibreoptic endoscopic evaluation of swallowing is preferred due to the high incidence of pooling of secretion and risk of silent aspiration.⁵

• MRI scanning may also be required before any surgery is considered - for example, if there is oesophageal carcinoma.

• Endoscopic ultrasonography can assist with staging in oesophageal carcinoma.

• Videofluoroscopy is the radiological investigation of choice when 'dificuldade para engolir' rather than 'food sticking' is the presenting symptom and/or aspiration is suspected. However, fibreoptic endoscopic evaluation of swallowing (FEES) may be preferred if a less invasive approach is required, there are concerns about aspiration, repeated examinations are needed, or an assessment of swallowing using real food is required.⁶

• If the patient has no supra-oesophageal symptoms, negative barium swallow, negative FEES findings, and clinical evidence of oesophageal dysphagia, they should be referred to a gastroenterologist for a barium video-oesophagogram. This assesses both the anatomy (strictures or tumour) and motility function of the oesophagus (such as achalasia).

Quando encaminhar⁷

Geral

The patient may need to chew well or liquidise food.

There is insufficient evidence currently to support the efficacy of dietary modification, swallowing manoeuvres, surgical interventions, enteral feeding or intravenous immunoglobulin for the treatment of chronic neuromuscular conditions.⁸ Patients with neurological problems (for example, cerebrovascular injury) may benefit from an early Speech and Language Therapy assessment.⁹

Eosinophilic oesophagitis may be treated with dietary modification, topical steroids, leukotriene antagonists and other drugs, and endoscopic dilation.³

Cirúrgico

Definitive treatment depends on cause:

• Strictures may be managed with endoscopic dilation (either using bougies or inflatable balloons).

• If oesophageal carcinoma is diagnosed, staging will dictate whether curative surgery (for example, oesophagectomy) and chemotherapy are appropriate.¹⁰

• The overall five-year survival rate is 20-25% for all stages. Not surprisingly, lymph node involvement equates with a poorer prognosis. A study of 1,085 patients who underwent oesophagectomy showed a 4% operative mortality rate and a 23% survival rate. For patients who had pre-operative chemoradiotherapy, the prognosis improved to 48%.¹¹

• In oesophageal carcinoma, palliative relief of dysphagia can be achieved with:

  • Repeated dilatation.

  • Stent replacement.¹²

  • Laser photocoagulation.

  • Injection of sclerosants.

• Brachytherapy can be a useful alternative or adjunct.

• Surgical myotomy and endoscopic injection of the sphincter with botulinum toxin are occasionally used for some aetiologies.

• Desnutrição; nutritional support is often needed prior to treatment.

• Pneumonia por aspiração pode ocorrer.

• Perforation may occur iatrogenically.