Clinical Swallowing Examination (CSE): Bedside Assessment Protocol for SLPs and Clinicians

The Clinical Swallowing Examination (CSE) — also called the Bedside Swallowing Assessment (BSA) or Clinical Bedside Swallowing Assessment — is the standard first-line evaluation performed by a speech-language pathologist (SLP) or trained clinician when dysphagia is suspected. It is non-instrumental, meaning it does not use imaging or endoscopy, but it provides critical information that guides immediate management and determines whether instrumental assessment (VFSS or FEES) is indicated.

This article describes the full protocol, clinical reasoning at each step, and how findings translate into clinical decisions.

Purpose and Scope of the CSE

The CSE serves several distinct functions:

• Screening confirmation: Converts a positive dysphagia screen into a structured clinical assessment
• Aspiration risk stratification: Identifies patients at high risk of silent aspiration requiring urgent instrumental follow-up
• Diet and fluid prescription: Guides interim IDDSI level recommendations until instrumental data are available
• Candidacy for instrumental assessment: Determines whether the patient can cooperate with VFSS or FEES
• Baseline documentation: Records swallowing status for longitudinal monitoring

The CSE does not definitively rule out aspiration — that is the role of instrumental assessment. Its value lies in efficiently identifying who needs urgent imaging and who can safely proceed with a conservative management plan.

When Is a CSE Indicated?

A CSE is indicated when:

• A validated dysphagia screen (e.g., EAT-10, GUSS, 3-oz water test, TOR-BSST) is positive
• A patient or family member reports coughing, choking, wet voice, or weight loss related to eating
• A patient has a neurological condition (stroke, Parkinson’s disease, ALS, dementia) known to increase dysphagia risk
• There is unexplained recurrent chest infection, aspiration pneumonia, or dehydration
• The patient has undergone head and neck surgery, radiotherapy, or has structural oropharyngeal pathology

ASHA guidelines recommend SLP involvement whenever dysphagia is suspected in acute hospital settings. In Hong Kong’s Hospital Authority facilities, a physician or nursing dysphagia screen typically precedes SLP referral, with the CSE conducted within 24–48 hours for inpatient referrals.

Structure of the CSE: Five Components

1. Medical History and Chart Review

Before examining the patient, the SLP reviews:

• Diagnosis and onset: Stroke location and type, duration of intubation, head and neck cancer treatment history
• Current nutrition: Nil by mouth (NBO) status, nasogastric tube, PEG tube, IV fluids
• Respiratory status: Oxygen supplementation, tracheostomy, SpO2 baseline, ventilator settings
• Medications: Drugs that may impair swallowing (anticholinergics, antipsychotics, opioids, dry mouth side effects)
• Nutritional parameters: Recent weight, albumin, BMI — indicators of chronic undernutrition from dysphagia
• Previous swallowing assessments: Any prior VFSS/FEES reports

This review takes approximately 5–10 minutes and significantly narrows the differential before the patient is seen.

2. Patient Interview

A brief structured interview assesses:

• Self-reported swallowing symptoms: coughing with food/fluids, food sticking, drooling, prolonged mealtimes
• Symptom onset and trajectory (acute vs. progressive)
• Foods and liquids avoided or difficult to manage
• Mealtime position, environment, and assistance required
• Appetite, weight change, and dietary restriction history

In patients with cognitive impairment or aphasia, the interview is adapted: yes/no questions, family informant history, or behavioural observation during a meal.

3. Oral Mechanism Examination

The oral mechanism examination evaluates the structural and neuromotor integrity of the swallowing apparatus:

Facial and labial structures

• Facial symmetry at rest and during movement (raise eyebrows, smile, puff cheeks)
• Lip seal and labial strength (using tongue depressor resistance test)
• Drooling or saliva loss from the mouth

Mandible and dentition

• Range of jaw opening and lateral excursion
• Dental status: natural teeth, dentures (presence and fit), edentulous ridges
• Temporomandibular joint tenderness

Tongue

• Bulk, symmetry, and texture (fasciculations suggest lower motor neuron disease)
• Range of motion: protrusion, lateralisation, elevation to hard palate
• Strength: resistance against tongue depressor
• Coordination: rapid alternating movements (la-la-la, ta-ta-ta, ka-ka-ka — diadochokinetic rate)

Velum (soft palate)

• Resting position and symmetry
• Velar elevation on phonation (“ah”): asymmetry suggests unilateral vagal palsy
• Gag reflex: assessed but of limited diagnostic value — absent gag does not predict aspiration; present gag does not rule it out

Larynx and vocal quality

• Voice quality at rest: hoarse, breathy, or wet/gurgly voice suggests laryngeal dysfunction
• Cough: voluntary cough strength (strong, weak, absent) and involuntary cough on secretions
• Throat clear: able to clear secretions voluntarily

Sensation

• Oral and pharyngeal sensation can be grossly assessed using touch stimulus to the tonsillar pillars, faucial arches, and base of tongue — reduced sensation correlates with risk of silent aspiration

4. Swallowing Trials

Swallowing trials involve offering the patient calibrated amounts of food and/or liquid across texture/viscosity levels while observing for clinical signs of aspiration or penetration.

Preconditions for proceeding with trials

• Patient is alert and able to follow at least two-step commands
• SpO2 stable (>92% on current supplemental oxygen)
• Able to sit upright (minimum 60 degrees) or tolerated positioning
• Voluntary cough is present (even if weak)

Swallowing trials are deferred if the patient is drowsy, unable to cooperate, or has active haemodynamic instability.

Standard trial progression (ASHA framework)

1. Teaspoon of water (5 mL) — thin liquids, lowest viscosity
2. Sequential sips from a cup (if Step 1 safe)
3. Teaspoon of puree (IDDSI Level 4 equivalent)
4. Soft solid (IDDSI Level 5 equivalent) — if clinical picture permits

Some protocols begin with thickened fluids and down-titrate. Clinical judgement governs sequencing based on history and oral mechanism findings.

Clinical signs observed during each trial

• Coughing or throat clearing before, during, or after the swallow (>1 minute post-swallow)
• Wet or gurgly voice change after swallowing (ask patient to phonate “ah” after each trial)
• Choking, gagging, or overt distress
• Multiple swallows per bolus or piecemeal swallowing
• Residue in oral cavity post-swallow
• SpO2 drop of >2% from baseline (weakly associated with aspiration; used as supplementary indicator)
• Prolonged oral transit (>2 seconds visible bolus manipulation)

Pulse oximetry: Some protocols monitor SpO2 throughout trials. A drop of 2–3% has been proposed as an aspiration indicator, but sensitivity and specificity are insufficient for standalone use (RCSLT, 2021). It is used as an adjunct signal, not a primary outcome.

5. Clinical Impression and Decision

Based on all preceding components, the SLP formulates:

Aspiration risk classification

• Low risk: No clinical signs, intact oral mechanism, successful thin fluid and diet trials — may proceed with diet per patient preference and clinical context
• Moderate risk: Isolated signs (wet voice without overt cough, mild oral residue) — modified IDDSI diet/fluid level, monitoring, possible instrumental referral
• High risk: Overt coughing, suspected silent aspiration, multiple failed trials, or high-risk diagnosis (e.g., bilateral hemisphere stroke, ALS with bulbar involvement) — NPO pending instrumental assessment

Instrumental assessment referral The CSE cannot directly visualise the pharynx or larynx during swallowing. When aspiration risk is uncertain or when a patient fails trials despite optimal positioning and texture modification, referral to VFSS or FEES is indicated. FEES is often preferred for bedside patients who cannot be transported to radiology; VFSS provides superior anatomical detail of pharyngeal and oesophageal phases.

Limitations of the CSE

The most significant limitation is its inability to detect silent aspiration — material entering the airway below the level of the vocal folds without triggering a cough or other observable response. Studies comparing CSE to VFSS have found that CSE misses 40–60% of aspiration events, predominantly because the silent variety occurs without clinical signs (Leder & Espinosa, 2002; McCullough et al., 2005).

Additional limitations include:

• Inter-rater variability across clinicians of different experience levels
• Inability to quantify pharyngeal residue, timing, or biomechanics of the swallow
• Cannot assess oesophageal function (VFSS or manometry required)
• Swallowing trials in clinical conditions do not replicate real mealtime conditions

Despite these limitations, the CSE remains essential: it is rapid, low-risk, widely available, and provides the foundational clinical data that contextualises all subsequent instrumental findings.

Documentation and Reporting

A complete CSE report documents:

• Referral reason and clinical background
• Oral mechanism examination findings (by structure)
• Swallowing trial results (bolus size, texture/viscosity, signs observed)
• Aspiration risk impression
• Recommended IDDSI diet level and fluid viscosity
• Positioning and compensatory strategy recommendations
• Plan for instrumental assessment (if indicated)
• Mealtime supervision requirements and family education needs

In Hospital Authority facilities, the CSE report feeds directly into the multidisciplinary team care plan and triggers dietitian referral for nutritional assessment in high-risk patients.

Training and Competency

In Hong Kong, CSE is conducted by registered SLPs (HKSAL members) or supervised SLP trainees. Nursing dysphagia screens (which precede the SLP referral) are distinct — they use validated tools such as the GUSS or Modified Water Swallow Test and do not substitute for the full CSE.

RCSLT (2021) and ASHA (2016) both publish competency frameworks specifying that clinicians performing CSE should have training in neuroanatomy, motor speech disorders, and swallowing physiology, with supervised clinical hours in acute and rehabilitation settings.

References

• American Speech-Language-Hearing Association (ASHA). (2016). Clinical indicators for instrumental assessment of dysphagia. ASHA Practice Policy.
• Royal College of Speech and Language Therapists (RCSLT). (2021). Dysphagia clinical guidelines. RCSLT.
• Leder SB, Espinosa JF. (2002). Aspiration risk after acute stroke: comparison of clinical examination and fiberoptic endoscopic evaluation of swallowing. Dysphagia, 17(3):214–8.
• McCullough GH, Wertz RT, Rosenbek JC. (2005). Sensitivity and specificity of clinical/bedside examination signs for detecting aspiration in adults subsequent to stroke. Journal of Communication Disorders, 38(6):413–430.
• Perry L, Love CP. (2001). Screening for dysphagia and aspiration in acute stroke: a systematic review. Dysphagia, 16(1):7–18.