Study guide
11.1 Dysphagia Assessment & Management
ABPMR Physical Medicine and Rehabilitation Board Exam Study Guide Exam
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1 Chapter 1: Introduction & Exam Overview
1.1 ABPMR Part I Exam Overview & Format 1.2 Board Review Strategy & Content Blueprint Breakdown
2 Chapter 2: Musculoskeletal Medicine
2.1 Shoulder & Upper Extremity Diagnostics 2.2 Knee, Hip & Lower Extremity Conditions 2.3 Spine Pathology, Radiculopathy & Myelopathy 2.4 Inflammatory Arthritis, Tendinopathies & Concussion 2.5 Bone Health, Osteoporosis & Metabolic Bone Disease 2.6 Thoracic Outlet Syndrome & Peripheral Nerve Entrapment 2.7 Fracture Rehabilitation & Immobilization Complications 2.8 Overuse Tendinopathies & Regenerative Medicine 2.9 Gait Analysis & Abnormal Gait Patterns
3 Chapter 3: Spinal Cord Injury Rehabilitation
3.1 ASIA Examination & Impairment Scale 3.2 Spinal Cord Injury Syndromes 3.3 Autonomic Dysreflexia & Acute Complications 3.4 Neurogenic Bladder, Bowel & Secondary Complications
4 Chapter 4: Stroke & Neuromuscular Rehabilitation
4.1 Stroke Vascular Syndromes & Acute Assessment 4.2 Stroke Motor Recovery & Hemiplegic Complications 4.3 Spasticity Assessment & Multimodal Management 4.4 ALS, GBS, CIDP & Neuromuscular Disease Rehab 4.5 Multiple Sclerosis & Demyelinating Disease Rehabilitation 4.6 Parkinsonism, Movement Disorders & Functional Neurologic Disorder
5 Chapter 5: Electrodiagnostics (EMG/NCS)
5.1 Nerve Conduction Studies Principles & Physics 5.2 Needle Electromyography & MUAP Analysis 5.3 Mononeuropathies & Radiculopathy Patterns 5.4 Neuromuscular Junction Disorders & Myopathies
6 Chapter 6: Traumatic Brain Injury
6.1 TBI Severity Classification, Glasgow Coma Scale, and Pathophysiology 6.2 Rancho Los Amigos Levels of Cognitive Functioning and Disability Rating Scale 6.3 Neurobehavioral Sequelae and Agitation Management 6.4 Concussion Evaluation, Vestibular-Ocular Dysfunction, and Return-to-Play/Work Protocols
7 Chapter 7: Chronic Pain & Interventional Spine
7.1 Fluoroscopic Spine Interventions 7.2 Opioid Stewardship & Controlled Substance Compliance 7.3 Complex Regional Pain Syndrome, Fibromyalgia & Myofascial Pain 7.4 Spinal Cord Stimulation & Intrathecal Therapy
8 Chapter 8: Amputee Rehabilitation & Prosthetics
8.1 Amputation Surgical Levels & Medicare K-Levels 8.2 Socket Designs & Suspension Systems 8.3 Prosthetic Feet & Microprocessor Knee Mechanisms 8.4 Post-Amputation Care, Residual Limb & Phantom Pain
9 Chapter 9: Pediatric Rehabilitation
9.1 Cerebral Palsy Classification & GMFCS 9.2 Spina Bifida & Myelomeningocele Management 9.3 Muscular Dystrophies & Neuromuscular Disease in Children 9.4 Pediatric Brachial Plexopathy & Congenital Disorders
10 Chapter 10: Prosthetics, Orthotics & Assistive Technology
10.1 Lower Limb Orthoses — AFOs & KAFOs 10.2 Spinal & Upper Extremity Orthoses 10.3 Upper Limb Prosthetics — Body-Powered vs Myoelectric 10.4 Wheelchairs, Seating Systems & Pressure Mapping
11 Chapter 11: Medical Rehabilitation & Outcomes
11.1 Dysphagia Assessment & Management 11.2 Neurogenic Bladder & Bowel Management 11.3 Pressure Injuries & Wound Management 11.4 Outcome Measures & Medical Complications 11.5 Cancer Rehabilitation & Oncologic Rehabilitation 11.6 Burns, Endocrine/Metabolic & Medical Complications Rehabilitation
12 Chapter 12: Cardiopulmonary Rehabilitation
12.1 Cardiac Rehabilitation Phases & Metabolic Equivalents 12.2 Pulmonary Rehabilitation & COPD Management
13 Chapter 13: Foundational Rehabilitation Concepts
13.1 Kinesiology, Biomechanics & Functional Anatomy 13.2 Rehabilitation Pharmacology & Medication Management 13.3 Research Methodology, Biostatistics & Evidence-Based Practice 13.4 Nutrition, Metabolism & Energy Expenditure in Rehabilitation 13.5 Diagnostic Procedures: Imaging, MSK Ultrasound, Urodynamics & Neuropsych Assessment
11.1 Dysphagia Assessment & Management
Key Takeaways Explain This Topic AI
Swallowing deglutition involves 4 phases (oral prep, oral transport, pharyngeal, esophageal) coordinated by CN V, VII, IX, X, XI, and XII.
FEES permits portable bedside evaluation of pharyngeal secretions and vocal fold anatomy without radiation, though white-out obscures the exact swallow moment.
The Rosenbek Penetration-Aspiration Scale (PAS 1-8) quantifies airway invasion; PAS 8 (Silent Aspiration) carries the highest clinical risk for aspiration pneumonia.
Chin-tuck maneuver flexes the neck, narrowing the airway entrance and widening the vallecular space for delayed swallow initiation.
Last updated: July 2026
Overview of Swallowing Physiology
Swallowing (deglutition) is a complex neuromuscular process involving the coordinated activity of over 30 muscles and 6 cranial nerves ( CN V, VII, IX, X, XI, XII ). It is classically divided into four distinct phases: oral preparatory, oral transport, pharyngeal, and esophageal. Understanding the exact mechanical sequence and neuroanatomical control of each phase is essential for PM&R physicians diagnosing and managing neurogenic dysphagia following stroke, traumatic brain injury (TBI), spinal cord injury (SCI), motor neuron disease, and Parkinson's disease.
Oral Preparatory Phase
The oral preparatory phase is voluntary and variable in duration depending on bolus consistency and mastication requirements. Key mechanical actions include:
Lip closure and labial seal : Maintained primarily by the orbicularis oris muscle ( CN VII ) to prevent anterior loss of food or liquid.
Mastication : Involves the muscles of mastication ( masseter, temporalis, medial and lateral pterygoids , innervated by CN V3 ) working in concert with cheek tension ( buccinator , CN VII ) to keep the bolus between the occlusal surfaces of the teeth.
Bolus manipulation and containment : The tongue ( CN XII ) manipulates the food, mixing it with saliva secreted by the submandibular/sublingual glands ( CN VII ) and parotid gland ( CN IX ). Posteriorly, the soft palate (velum) is pulled down against the tongue base by the palatoglossus muscle ( CN X ) to form a posterior oral seal, keeping the bolus within the oral cavity and preventing premature spillage into the pharynx prior to swallow initiation.
Oral Transport Phase
The oral transport phase is also voluntary and lasts approximately 1 to 1.5 seconds .
The tip and anterior margins of the tongue press against the alveolar ridge while the central tongue dorsum sequentially elevates from anterior to posterior in a stripping motion ("tongue pump").
This action propels the cohesive bolus backward through the faucial arches into the oropharynx.
The phase concludes as the bolus head passes the anterior faucial pillars (palatoglossal arches) or the posterior tongue base, which triggers the involuntary pharyngeal swallow reflex mediated by sensory afferents of CN IX (glossopharyngeal) and CN X (vagus) sending signals to the nucleus tractus solitarius (NTS) in the medulla.
Pharyngeal Phase
The pharyngeal phase is involuntary, highly rapid (lasting approximately 1 second ), and critical for airway protection. The central pattern generator in the brainstem coordinates a rapid, automated sequence of events:
Velopharyngeal closure : The soft palate elevates and retracts against the posterior pharyngeal wall ( levator veli palatini , CN X ) to seal the nasopharynx and prevent nasopharyngeal regurgitation.
Hyolaryngeal elevation and anterior displacement : Suprahyoid muscles ( mylohyoid [CN V3], geniohyoid [C1 via CN XII], anterior belly of digastric [CN V3], and stylohyoid [CN VII]) pull the hyoid bone and larynx superiorly and anteriorly. This mechanical traction physically pulls open the upper esophageal sphincter (UES) and tilts the epiglottis posteriorly.
Airway closure (Three Levels of Protection) :
Level 1 : True vocal fold adduction ( lateral cricoarytenoid , interarytenoid muscles, innervated by the recurrent laryngeal nerve of CN X ).
Level 2 : False vocal fold (ventricular fold) adduction and arytenoid tilting forward to contact the base of the epiglottis.
Level 3 : Epiglottic inversion over the laryngeal vestibule to divert the bolus laterally around the airway into the pyriform sinuses.
Pharyngeal constriction : The superior, middle, and inferior pharyngeal constrictor muscles ( CN IX, X ) contract sequentially in a top-to-bottom peristaltic wave, clearing the bolus through the pharynx.
Upper Esophageal Sphincter (UES) relaxation : The UES, primarily formed by the cricopharyngeus muscle ( CN X ), relaxes from its baseline tonic contraction. Combined with hyolaryngeal anterior traction and bolus pressure, the UES opens to allow the bolus to enter the esophagus.
Esophageal Phase
The esophageal phase is involuntary and lasts between 8 to 20 seconds . The bolus is propelled through the esophagus into the stomach by primary peristaltic waves. The proximal one-third of the esophagus consists of striated muscle (innervated by CN X via recurrent laryngeal nerve), the middle third transitions to smooth muscle, and the distal third is entirely smooth muscle (innervated by CN X via autonomous enteric plexus). The lower esophageal sphincter (LES) relaxes to allow bolus entry into the stomach.
Diagnostic Instrumental Evaluations: VFSS vs. FEES
Clinical bedside swallow examinations (CSE) are valuable initial screening tools but suffer from high false-negative rates for detecting silent aspiration (aspiration without a reflexive cough). Therefore, objective instrumental evaluation is the gold standard for diagnosing dysphagia, defining underlying biomechanical deficits, and testing therapeutic interventions.
Diagnostic Feature Videofluoroscopic Swallowing Study (VFSS / MBS) Fiberoptic Endoscopic Evaluation of Swallowing (FEES)
Methodology Dynamic real-time fluoroscopic X-ray recording in lateral and AP projections. Transnasal insertion of a flexible fiberoptic endoscope into the pharynx.
Visualization Scope Visualizes all 4 phases: oral, pharyngeal, and screening of esophageal phase. Direct visualization of nasopharynx, pharynx, larynx, and vocal cord anatomy.
Airway Protection Assesses depth of penetration/aspiration relative to vocal folds; tracks bolus trajectory. Directly visualizes anatomical structures, vocal fold mobility, and secretion management.
Key Limitation Radiation exposure, requires transfer to radiology suite, uses artificial barium contrast. "White-out" effect during pharyngeal contraction prevents viewing swallow moment.
Bedside Capability No; patient must travel to fluoroscopy suite and sit upright. Yes ; portable, can be performed at bedside, in ICU, or in wheelchair.
Secretions & Sensation Cannot directly visualize clear pharyngeal secretions; no sensory testing. Directly visualizes pharyngeal secretion pooling; FEEST allows sensory testing.
Diet Testing Tests standard barium-mixed food and liquid textures. Tests actual food, liquids, and medications without radiopaque agents.
Fatigue / Repeatability Time-limited due to radiation exposure limits; cannot perform extended fatigue testing. No radiation limits; permits prolonged evaluation, meal-time testing, and biofeedback.
Rosenbek Penetration-Aspiration Scale (PAS)
The Penetration-Aspiration Scale (PAS) is an 8-point validated ordinal scale used during instrumental swallowing studies to quantify the severity of airway invasion and the patient's physiological response to that invasion.
PAS Score Category Definition & Airway Clearance Response
1 Normal Material does not enter the airway.
2 Penetration Material enters the airway, remains above the vocal folds, and is cleared from the airway.
3 Penetration Material enters the airway, remains above the vocal folds, and is NOT cleared from the airway.
4 Penetration Material enters the airway, contacts the vocal folds , and is cleared from the airway.
5 Penetration Material enters the airway, contacts the vocal folds , and is NOT cleared from the airway.
6 Aspiration Material passes below the vocal folds (aspiration), but is cleared into the larynx or pharynx.
7 Aspiration Material passes below the vocal folds (aspiration), and is NOT cleared despite response/effort.
8 Silent Aspiration Material passes below the vocal folds (aspiration), and NO effort/cough is made to clear.
Clinical Pearl : A score of PAS 8 (Silent Aspiration) carries the highest clinical risk for aspiration pneumonia because sensory deficits prevent protective coughing, frequently seen in acute stroke, advanced neurodegenerative disease, or brainstem lesions affecting the sensory inputs of CN IX and CN X .
Diet Texture Modification: The IDDSI Framework
The International Dysphagia Diet Standardisation Initiative (IDDSI) provides standardized terminology and testing methods for texture-modified foods and thickened liquids (Levels 0–7).
Drink Levels (Levels 0–4) :
Level 0 (Thin) : Flows like water; passes through a 10 mL syringe in 10 seconds leaving 0 mL.
Level 1 (Slightly Thick) : Thicker than water; leaves 1 to 4 mL in a 10 mL syringe after 10 seconds.
Level 2 (Mildly Thick) : Flows off a spoon; leaves 4 to 8 mL in a 10 mL syringe after 10 seconds.
Level 3 (Moderately Thick / Liquidised) : Can be drunk from a cup or spoon; leaves > 8 >8 > 8 mL in syringe.
Level 4 (Extremely Thick / Pureed) : Cannot be drunk from a cup; eaten with a spoon; holds shape on a spoon.
Food Levels (Levels 3–7) :
Level 3 (Liquidised) : Smooth texture, no bite size required.
Level 4 (Pureed) : Smooth, uniform, no chewing required; does not require biting.
Level 5 (Minced & Moist) : Soft and moist; small particle size ( ≤ 4 \le 4 ≤ 4 mm for adults).
Level 6 (Soft & Bite-Sized) : Soft, tender, bite-sized pieces ( ≤ 1.5 \le 1.5 ≤ 1.5 cm for adults).
Level 7 (Regular / Easy to Chew) : Normal, everyday foods; soft textures without hard/crunchy components.
Compensatory Postures and Therapeutic Maneuvers
Chin-Tuck Maneuver (Head Flexion) :
Mechanism : Flexes the neck forward, bringing the chin toward the chest. This narrows the pharyngeal airway entrance, shifts the epiglottis and tongue base posteriorly, and widens the vallecular space.
Clinical Indication : Ideal for patients with delayed pharyngeal swallow initiation, reduced tongue base retraction, or reduced airway closure resulting in premature spillage and pre-swallow aspiration.
Head Rotation (Turn to Impaired Side) :
Mechanism : Rotating the head toward the weak/paretic pharyngeal side closes off the paretic pyriform sinus and directs the bolus down the intact, stronger contralateral pharyngeal side.
Clinical Indication : Unilateral pharyngeal weakness (e.g., Wallenberg syndrome / lateral medullary stroke).
Head Tilt (Tilt to Unimpaired Side) :
Mechanism : Tilting the head toward the stronger side utilizes gravity to channel the bolus down the intact oral and pharyngeal side.
Effortful Swallow :
Mechanism : Asking the patient to "swallow hard" with all muscles. Increases tongue base retraction and pharyngeal pressure generation to clear pharyngeal residue.
Mendelsohn Maneuver :
Mechanism : The patient manually holds the larynx at its highest point of elevation for 2–3 seconds during the swallow. Prolongs UES opening and enhances hyolaryngeal excursion.
Supraglottic & Super-Supraglottic Swallow :
Mechanism : Patient holds breath, swallows, then immediately coughs. Super-supraglottic adds bearing down (Valsalva). Closes vocal folds prior to and during the swallow to prevent intra-swallow aspiration.