Dysphagia Knowledge Hub — 吞嚥困難知識庫

Supraglottic and Super-Supraglottic Swallow: Clinical Guide and Patient Teaching

The supraglottic swallow (SGS) and super-supraglottic swallow (SSGS) are among the most widely taught voluntary airway protection manoeuvres in dysphagia rehabilitation. Developed within the behavioural swallowing therapy framework, these techniques enable patients to compensate for impaired reflexive laryngeal closure by voluntarily closing the airway before food or liquid enters the pharynx. This guide covers mechanism, procedural steps, evidence base, FEES and VFSS correlates, appropriate patient selection, and practical teaching scripts for use in clinical practice.

Mechanism of Voluntary Glottic Closure

During a normal swallow, the vocal folds adduct reflexively as part of the laryngeal vestibule closure sequence, which also involves aryepiglottic fold approximation and laryngeal elevation. In patients with neurological conditions, head and neck cancer, or laryngeal structural changes, this reflexive closure may be delayed, incomplete, or absent, exposing the trachea to penetration and aspiration.

Supraglottic swallow exploits the physiological link between breath-holding and true vocal fold adduction. Voluntarily holding the breath triggers bilateral vocal fold closure via the glottic closure reflex. If the patient holds their breath immediately before and during the swallow, the vocal folds remain adducted through the pharyngeal phase. A forceful exhalation or cough immediately after the swallow expels any residue resting on the adducted folds before the next inhalation.

Super-supraglottic swallow extends this concept by adding a bearing-down or Valsalva effort during the breath-hold, which closes the laryngeal vestibule above the true vocal folds (the false vocal folds and aryepiglottic folds) in addition to glottic closure. This produces a wider, higher “seal” and is used when aspiration occurs above the glottis or when the supraglottic swallow alone is insufficient.

The Five-Step Procedure

The following steps apply to the standard supraglottic swallow. The SSGS adds a bearing-down effort at step 2.

  1. Prepare the bolus. Place food or liquid in the mouth as directed by the clinician.
  2. Take a breath and hold it tightly. Instruct the patient: “Take a breath in, then hold it as if you are lifting something heavy.” For the SSGS, add: “And bear down or strain as you hold.”
  3. Swallow while still holding your breath. The patient executes the swallow with the breath held and (for SSGS) the bearing-down effort maintained throughout.
  4. Cough immediately after the swallow. This clears any material from the closed vocal fold surface before the airway opens.
  5. Swallow again, then breathe. A second “clean-up” swallow clears pharyngeal residue before inhalation resumes.

Timing is critical: the patient must begin the swallow during the breath-hold, not after releasing it. Common errors include premature exhalation before swallowing, inadequate breath-hold tension, and omitting the post-swallow cough.

Evidence Base: Head and Neck Cancer

The strongest evidence for both techniques comes from head and neck cancer populations, particularly patients who have undergone supraglottic laryngectomy or base-of-tongue resection, where reflexive airway closure is structurally compromised.

Logemann et al. (1994) demonstrated that the supraglottic swallow reduced or eliminated aspiration in 78% of supraglottic laryngectomy patients on VFSS. Pauloski et al. (1998) reported significant reductions in aspiration with SGS in patients post-oral and oropharyngeal resection. Lazarus et al. (2002) compared SGS and SSGS in head and neck cancer patients and found the SSGS more effective for reducing vestibule penetration in patients with impaired supraglottic closure.

Evidence in neurological populations is more limited but supports use in selected patients with cortical or brainstem stroke affecting laryngeal closure timing. Martin-Harris et al. (2005) identified specific VFSS parameters that predict SGS efficacy, including timing of vocal fold closure relative to bolus arrival at the pharynx.

Contraindications and Patient Selection

The supraglottic swallow requires adequate breath support, breath-hold control, and the ability to produce a voluntary cough. Contraindications include:

In patients with intact pulmonary reserve but mild cognitive impairment, simplified instruction, visual cues (a written card with steps), or caregiver coaching may make the technique accessible. In patients post-laryngectomy (total), the technique is anatomically inapplicable.

FEES and VFSS Correlates

On VFSS (videofluoroscopic swallowing study), the supraglottic swallow typically demonstrates earlier onset of laryngeal closure, reduced penetration depth on the Penetration-Aspiration Scale (PAS), and cleaner post-swallow laryngeal vestibule compared with the patient’s uncompensated swallow. Residue on the vocal fold surface before the post-swallow cough is a normal and expected finding; the adequacy of cough clearance is the critical variable.

On FEES, the supraglottic swallow is assessed by observing the degree of laryngeal vestibule closure before pharyngeal constriction, the presence of spillage onto adducted folds, and the effectiveness of the post-swallow cough in clearing residue. Langmore (2003) recommends comparing PAS scores across conditions (standard vs. SGS vs. SSGS) systematically to determine which technique confers the greatest benefit for each patient.

Patient Teaching Script

The following script is designed for SLTs teaching the supraglottic swallow to a literate adult patient:

“I’m going to teach you a special way to swallow that will help protect your airway. It has five steps, and we’ll practise without food first. Here is the sequence: Step 1: Put the food in your mouth. Step 2: Take a breath in, then hold it — hold it tight like you’re lifting something very heavy. Keep holding. Step 3: While still holding your breath, swallow. Step 4: As soon as you swallow, cough — cough firmly right away. Step 5: Swallow one more time, then breathe. The most important things to remember: hold your breath before the swallow starts, cough straight after, and don’t breathe until you’ve coughed and swallowed again. Let’s try it without any food first — just the breath hold, swallow, cough, swallow sequence.”

For the SSGS, add to step 2: “…and at the same time, push down hard as if you’re straining — like a bear-down.” Demonstrate visually and confirm understanding before progressing to food trials.

Fatigue and Long-Term Use

A key practical concern is the cognitive and muscular effort required per swallow. Patients using the SGS or SSGS for every bolus across a full meal may experience fatigue-related technique deterioration, increased meal duration, and reduced intake. Clinical management should include:

References