Martin-Harris B, McFarland D, Hill EG, Strange CB, Focht KL, Wan Z, Blair J, McGrattan K.
Arch Phys Med Rehabil. 2014 Dec 11.
To test a novel intervention to train swallowing to occur in the mid-to-low expiratory phase of quiet breathing to improve swallowing safety and efficiency.
Safety and efficacy non-randomized clinical trial with one-month follow-up.
Head and neck cancer (HNC) ambulatory clinics.
Thirty patients with HNC and chronic dysphagia completed the intervention. Fifteen of these patients participated in a one-month follow-up visit.
Training protocol based on hierarchy of motor skill acquisition to encourage autonomous and optimal respiratory-swallowing coordination. Visual feedback of respiratory phase and volume for swallowing initiation was provided by nasal airflow and rib cage/abdomen signals.
MAIN OUTCOME MEASURES:
Respiratory-swallow phase pattern, Modified Barium Swallow Impairment Profile™© (MBSImP) scores, Penetration Aspiration Scale (PAS) scores, M.D. Anderson Dysphagia Inventory scores RESULTS: Using visual feedback, patients were trained to initiate swallows during the mid-expiratory phase of quiet breathing and to continue to expire after swallowing. This optimal phase patterning increased significantly after treatment (p <0.0001). Changes in respiratory-swallowing coordination were associated with improvements in three MBSImP component scores: laryngeal vestibular closure (p = 0.0004), tongue base retraction (p <0.0001), and pharyngeal residue (p = 0.01). Significant improvements were also seen in PAS scores (p <0.0001). Relative to pre-treatment values, patients participating in one-month follow-up had increased optimal phase patterning (p <0.0001), improved laryngeal vestibular closure (p = 0.01), tongue base retraction (p = 0.003), and pharyngeal residue (p = 0.006) MBSImP scores, and improved PAS scores (p <0.0001).
Improvements in respiratory-swallowing coordination can be trained using a systematic protocol and respiratory phase-lung volume related biofeedback in patients with HNC and chronic dysphagia, with favorable effects on airway protection and bolus clearance.