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There is current controversy as to whether electrical stimulation of upper airway musculature can be used us a beneficial treatment modality in patients with obstructive sleep apnoea syndrome. Increased upper airway (UAW) muscle activity decreases UAW resistance (Ruaw) in isolated UAW of dogs. In the present study, we evaluated the effect of UAW muscle contraction on UAW patency in anaesthetized dogs in vivo breathing spontaneously through partially and completely obstructed UAW. Airflow and supraglottic pressure were measured to obtain Ruaw. Ruaw could be regulated by inhalation of a rubber balloon implanted transcutaneously in the pharyngeal submucosa to produce partial or complete obstruction. Wire electrodes were implanted bilaterally into the genioglossus (GG), geniohyoid (GH), sternothyroid (ST), and sternohyoid (SH) muscles for electrical stimulation (ES), and into the alae nasi for electromyographic (EMG) recording. Three levels of electrical stimulation were delivered to each muscle before and during partial or complete UAW obstruction. Genioglossus and geniohyoid stimulation both resulted in a significant reduction in Ruaw, which was most pronounced during partial obstruction, reducing Ruaw from 54 +/- 11 to 14 +/- 3 and from 74 +/- 12 to 31 +/- 5 cmH2O.L-1.s, respectively. At low voltage, stimulation of the genioglossus was more effective than stimulation of the geniohyoid in reducing Ruaw. Furthermore, electrical stimulation of the genioglossus but not of the geniohyoid released total obstruction. In contrast, electrical stimulation of the sternohyoid and sternothyroid produced no significant change in Ruaw. These findings demonstrate that selective UAW dilatory muscle contraction in spontaneously breathing anaesthetized dogs reduces Ruaw in the presence of UAW obstruction and releases UAW occlusion, with the genioglossus being the most effective muscle. This favours further attempts to investigate the benefits of electrical stimulation of selected upper airway muscles in the treatment of obstructive sleep apnoea syndrome.
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