Mitchell ReedUniversity of Louisville | UL · Department of Neurological Surgery
Mitchell Reed
Doctor of Philosophy
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15
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Publications (15)
Swallow is a primitive behavior regulated by medullary networks, responsible for movement of food/liquid from the oral cavity to the esophagus. To investigate how functionally heterogeneous networks along the medullary intermediate reticular formation (IRt) and ventral respiratory column (VRC) control swallow, we electrically stimulated the nucleus...
Lung volume is modulated by sensory afferent feedback via vagal and spinal pathways. The purpose of this study was to systematically alter afferent feedback with and without a mechanical challenge (chest compression). We hypothesized that manipulation of afferent feedback by nebulization of lidocaine, extra-thoracic vagotomy, or lidocaine administr...
Swallow-breathing coordination is influenced by changes in lung volume, which is modulated by feedback from both vagal and spinal sensory afferents. The purpose of this study was to manipulate feedback from these afferents, with and without a simultaneous mechanical challenge (chest compression), in order to assess the influence of each sensory pat...
Afferent feedback can appreciably alter the pharyngeal phase of swallow. In order to measure the stability of the swallow motor pattern during several types of alterations in afferent feedback, we assessed swallow during a conventional water challenge in four anesthetized cats, and compared that to swallows induced by fixed (20 Hz) and stochastic (...
Bullfrog tadpoles ventilate both the buccal cavity and lung. In isolated brainstems, the midbrain/pons influences CO2 responsiveness and timing of lung ventilatory bursting, depending on larval development. However, little is known about midbrain/pons influences on buccal burst patterns. As such, we investigated how removal of this region affects b...
Respiratory variability is important in order to respond to internal and external perturbations. While vagal afferents have been shown to be important for feedback during breathing, the influence of spinal afferents has not been as well described. We hypothesized that disruption of vagal and spinal afferents reduces respiratory variability during e...
Prior work exploring the role of the cerebellum in cough has been limited to paralyzed preparations. Xu et al. (1997) found in paralyzed, artificially ventilated, and decerebrated cats that after cerebellectomy cough number and expiratory magnitude was reduced with no change in phrenic bursting. However, we hypothesized that the cerebellum would ha...
Atropine, a muscarinic acetylcholine receptor antagonist, is a commonly used drug to reduce mucous production during surgery. Because atropine blocks the parasympathetic action of acetylcholine, atropine may modulate the balance of parasympathetic and sympathetic activity. In jaw muscles, increased sympathetic drive decreases muscle contractility a...
Anatomical connections are reported between the cerebellum and brainstem nuclei involved in swallow such as the nucleus tractus solitarius, nucleus ambiguus, and Kölliker-fuse nuclei. Despite these connections, a functional role of the cerebellum during swallow has not been elucidated. Therefore, we examined the effects of cerebellectomy on swallow...
Purpose:
Airway protective behaviors, like cough and swallow, deteriorate in many populations suffering from neurologic disorders. While coordination of these behaviors has been investigated in an animal model, it has not been tested in humans.
Methods:
We used a novel protocol, adapted from previous work in the cat, to assess cough and swallow...
Active contraction of the diaphragm and other inspiratory pump muscles during swallow create a negative thoracic pressure to improve the movement of the bolus (food/liquid) into the esophagus. We tested the hypothesis that dorsomedial medullary inspiratory neurons, including the nucleus tractus solitarius (NTS, pre-motor to the phrenic) would be ac...
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Swallow and breathing are highly coordinated behaviors reliant on shared anatomical space and neural pathways. Incremental ascent to high altitudes results in hypoxia/hypocapnic conditions altering respiratory drive, however it is not known whether these changes also alter swallow. We examined the effect of incremental ascent (1045m, 3440m and 4371...
The development of amphibian breathing provides insight into vertebrate respiratory control mechanisms. Neural oscillators in the rostral and caudal medulla drive ventilation in amphibians, and previous reports describe ventilatory oscillators and CO2 sensitive regions arise during different stages of amphibian metamorphosis. However, inconsistent...
We have recently identified mammalian spinal preganglionic sympathetic neurons as spinal oxygen sensors (SOS). These cells are excited by hypoxia, silenced by hyperoxia, and contribute to oxygen‐sensitive sympathetic responses important for cardiovascular regulation. In general, terrestrial vertebrates experience acute or chronic hypoxia only durin...