Central nervous system integration of sensorimotor signals in oral and pharyngeal structures: oropharyngeal kinematics response to recurrent laryngeal nerve lesion.
Animals; Central Nervous System/*physiology; dysphagia; Feeding Methods; Female; infant; Larynx/*physiology; Male; mammalian feeding; Newborn; Oropharynx/*physiology; Pharynx/*physiology; Recurrent Laryngeal Nerve/*physiology; Sensation/physiology; Sensorimotor Cortex/*physiology; swallow control; Swine; tongue kinematics; Tongue/physiology
Safe, efficient liquid feeding in infant mammals requires the central coordination of oropharyngeal structures innervated by multiple cranial and spinal nerves. The importance of laryngeal sensation and central sensorimotor integration in this system is poorly understood. Recurrent laryngeal nerve lesion (RLN) results in increased aspiration, though the mechanism for this is unclear. This study aimed to determine the effect of unilateral RLN lesion on the motor coordination of infant liquid feeding. We hypothesized that 1) RLN lesion results in modified swallow kinematics, 2) postlesion oropharyngeal kinematics of unsafe swallows differ from those of safe swallows, and 3) nonswallowing phases of the feeding cycle show changed kinematics postlesion. We implanted radio opaque markers in infant pigs and filmed them pre- and postlesion with high-speed videofluoroscopy. Markers locations were digitized, and swallows were assessed for airway protection. RLN lesion resulted in modified kinematics of the tongue relative to the epiglottis in safe swallows. In lesioned animals, safe swallow kinematics differed from unsafe swallows. Unsafe swallow postlesion kinematics resembled prelesion safe swallows. The movement of the tongue was reduced in oral transport postlesion. Between different regions of the tongue, response to lesion was similar, and relative timing within the tongue was unchanged. RLN lesion has a pervasive effect on infant feeding kinematics, related to the efficiency of airway protection. The timing of tongue and hyolaryngeal kinematics in swallows is a crucial locus for swallow disruption. Laryngeal sensation is essential for the central coordination in feeding of oropharyngeal structures receiving motor inputs from different cranial nerves.
Gould Francois D H; Ohlemacher Jocelyn; Lammers Andrew R; Gross Andrew; Ballester Ashley; Fraley Luke; German Rebecca Z
Journal of applied physiology (Bethesda, Md. : 1985)
2016
2016-03
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1152/japplphysiol.00946.2015" target="_blank" rel="noreferrer noopener">10.1152/japplphysiol.00946.2015</a>
Maturation of the Coordination Between Respiration and Deglutition with and Without Recurrent Laryngeal Nerve Lesion in an Animal Model.
*Animal model; *Deglutition; *Development; *Infant; *Recurrent laryngeal nerve; *Respiration; *Sensorimotor; Animal; Animal Population Groups; Animals; Biological; Deglutition – Physiology; Deglutition Disorders; Deglutition/*physiology; Disease Models; Humans; Laryngeal Nerves – Injuries; Laryngeal Nerves – Physiology; Larynx – Physiology; Larynx/*physiology; Models; Newborn; Questionnaires; Recurrent Laryngeal Nerve Injuries/*complications; Recurrent Laryngeal Nerve/physiology; Respiration; Swine
The timing of the occurrence of a swallow in a respiratory cycle is critical for safe swallowing, and changes with infant development. Infants with damage to the recurrent laryngeal nerve, which receives sensory information from the larynx and supplies the intrinsic muscles of the larynx, experience a significant incidence of dysphagia. Using our validated infant pig model, we determined the interaction between this nerve damage and the coordination between respiration and swallowing during postnatal development. We recorded 23 infant pigs at two ages (neonatal and older, pre-weaning) feeding on milk with barium using simultaneous high-speed videofluoroscopy and measurements of thoracic movement. With a complete linear model, we tested for changes with maturation, and whether these changes are the same in control and lesioned individuals. We found (1) the timing of swallowing and respiration coordination changes with maturation; (2) no overall effect of RLN lesion on the timing of coordination, but (3) a greater magnitude of maturational change occurs with RLN injury. We also determined that animals with no surgical intervention did not differ from animals that had surgery for marker placement and a sham procedure for nerve lesion. The coordination between respiration and swallowing changes in normal, intact individuals to provide increased airway protection prior to weaning. Further, in animals with an RLN lesion, the maturation process has a larger effect. Finally, these results suggest a high level of brainstem sensorimotor interactions with respect to these two functions.
Ballester Ashley; Gould Francois; Bond Laura; Stricklen Bethany; Ohlemacher Jocelyn; Gross Andrew; DeLozier Katherine R; Buddington Randall; Buddington Karyl; Danos Nicole; German Rebecca
Dysphagia
2018
2018-10
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1007/s00455-018-9881-z" target="_blank" rel="noreferrer noopener">10.1007/s00455-018-9881-z</a>