Disorders of Swallowing: Evaluation and Management

Disorders of Swallowing (Dysphagia)

Introduction to Swallowing and Dysphagia

Swallowing is a complex process essential for nutrition and hydration. Dysphagia refers to difficulty with eating or swallowing and can affect individuals across the lifespan. Speech-language pathologists (SLPs) play a central role in the evaluation and management of dysphagia in both pediatric and adult populations. Dysphagia can lead to medical complications such as malnutrition, dehydration, aspiration pneumonia, and psychosocial issues including isolation and reduced quality of life.

Normal and Disordered Swallowing

Phases of Normal Swallowing

Swallowing is divided into four main phases, each with distinct anatomical and physiological features:

• Oral Preparation Phase: Food is chewed and mixed with saliva to form a bolus. The tongue and cheeks help position the bolus for swallowing.

• Oral Transport Phase: The tongue propels the bolus from the front to the back of the mouth, triggering the pharyngeal swallow reflex.

• Pharyngeal Phase: The velum elevates to close off the nasal cavity, the larynx elevates and closes to protect the airway, and the pharyngeal muscles contract to move the bolus toward the esophagus.

• Esophageal Phase: Peristaltic contractions move the bolus through the esophagus into the stomach.

Disordered Swallowing (Dysphagia)

Dysphagia can occur in any phase of swallowing and may result from structural, neurological, or functional impairments. Common problems include:

• Oral Phase: Poor lip seal (drooling), impaired chewing, insufficient saliva, and poor tongue control.

• Pharyngeal Phase: Delayed or absent swallow reflex, aspiration (entry of material into the airway), nasal regurgitation, and pharyngeal residue.

• Esophageal Phase: Impaired peristalsis, esophageal residue, and reflux.

Etiologies of Pediatric and Adult Dysphagia

Common Causes in Children

• Prematurity: Immature suck-swallow-breathe coordination, often requiring tube feeding.

• Cerebral Palsy: Poor oral motor control, reflux, and need for gastrostomy tube in severe cases.

• Intellectual and Developmental Disabilities: Delayed motor skills and communication barriers.

• Autism Spectrum Disorder: Sensory aversions and restricted diets leading to poor nutrition.

• Craniofacial Anomalies: Cleft lip/palate causing feeding and swallowing difficulties.

Common Causes in Adults

• Stroke: Oral-motor and sensory deficits, poor bolus control, and risk of silent aspiration.

• Head and Neck Cancer: Surgery and radiation affecting swallowing structures and function.

• Parkinson Disease: Reduced coordination, delayed swallow, and esophageal dysmotility.

• Traumatic Brain Injury: Motor and cognitive deficits affecting safe swallowing.

• Dementia: Impaired attention, memory, and oral motor function.

Evaluation for Swallowing Disorders

Screening for Dysphagia

Screening identifies individuals at risk for dysphagia. For adults, tools like the Yale Swallow Protocol (YSP) are used, involving cognitive screening, oral mechanism examination, and a water swallow test. For infants and children, feeding observations and growth monitoring are key.

Clinical Swallow Evaluation (CSE)

The CSE includes:

• Case history and background information

• Cognitive-communication assessment

• Observation of environmental and caregiver factors

• Oral mechanism examination (lips, tongue, palate, cranial nerves)

• Swallow trials with various food and liquid consistencies

Instrumental Swallow Examination

• Videofluoroscopic Swallowing Study (VFSS/MBSS): X-ray procedure using barium to visualize swallowing function and detect aspiration or residue.

• Fiberoptic Endoscopic Evaluation of Swallowing (FEES): Flexible scope inserted through the nose to directly observe pharyngeal and laryngeal structures during swallowing.

Treatment of Swallowing Disorders

Compensatory Strategies

• Modify feeding environment (reduce distractions, appropriate lighting, attentive caregivers)

• Use of specialized feeding utensils (e.g., slow-flow nipples, shallow-bowled spoons, cutout cups)

• Diet modification (altering food texture and liquid viscosity according to the International Dysphagia Diet Standardization Initiative, IDDSI)

• Nonoral feeding methods (NG tube, PEG/G-tube, J-tube, total parenteral nutrition)

• Body and head positioning (upright posture, chin tuck, head rotation)

Direct and Indirect Rehabilitative Treatments

• Exercise-Based Therapy: Strengthening and coordination exercises for swallowing muscles (e.g., tongue resistance training, effortful swallow, Mendelsohn maneuver).

• Swallowing-Specific Exercises: Effortful swallow, supraglottic and super-supraglottic swallow, Mendelsohn maneuver.

• Surface Electromyography (sEMG): Biofeedback tool for muscle activation during swallowing exercises.

• Neuromuscular Electrical Stimulation (NMES): Electrical stimulation to enhance muscle contraction and swallowing function.

Prostheses and Surgical Procedures

• Palatal obturators for soft palate defects

• Tongue prostheses for glossectomy patients

• Additional SLP strategies to optimize prosthetic use

Summary Table: Common Etiologies of Feeding and Swallowing Disorders

Population	Etiology	Description
Children	Prematurity	Immature suck-swallow-breathe coordination, tube feeding often required
Children	Cerebral Palsy	Poor oral motor control, reflux, possible need for gastrostomy tube
Children	ASD	Sensory aversions, restricted diets, risk of poor nutrition
Adults	Stroke	Oral-motor and sensory deficits, risk of aspiration
Adults	Head and Neck Cancer	Surgical/radiation effects on swallowing structures
Adults	Parkinson Disease	Reduced coordination, delayed swallow, esophageal dysmotility

Key Terms

• Dysphagia: Difficulty swallowing

• Aspiration: Entry of food or liquid into the airway

• Bolus: A mass of food or liquid prepared for swallowing

• Peristalsis: Rhythmic contractions moving food through the esophagus

• Videofluoroscopy: X-ray imaging of swallowing

• FEES: Endoscopic visualization of swallowing

• Compensatory strategies: Techniques to maintain safety and nutrition without changing swallowing physiology

• Direct/Indirect rehabilitation: Exercises to improve swallowing function