Abstract:
:Midcervical contusion injuries disrupt descending ipsilateral excitatory bulbospinal projections to phrenic motoneurons, compromising ventilation. We hypothesized that a unilateral contusion injury at C3 versus C5 would differentially impact phrenic activity reflecting more prominent disruption of ipsilateral descending excitatory drive to more caudal segments of the phrenic motor pool with more cranial injuries. Phrenic motoneuron counts and evidence of diaphragm muscle denervation at individual neuromuscular junctions (NMJ) were evaluated at 14 days post-injury after unilateral contusion injury (100 kDynes). Whole body plethysmography and chronic diaphragm EMG were measured before the injury and at 3, 7, and 14 days post-injury. Contusion injuries at either level resulted in a similarly sized cavity. C3 contusion resulted in loss of 39 ± 13% of ipsilateral phrenic motoneurons compared with 13 ± 21% after C5 contusion (p = 0.003). Cervical contusion injuries resulted in diaphragm muscle denervation (C3 contusion: 17 ± 4%; C5 contusion: 7 ± 4%; p = 0.047). The pattern of denervation revealed segmental innervation of the diaphragm muscle, with greater denervation ventrally after C3 contusion and dorsally after C5 contusion. Overall, diaphragm root mean square electromyography activity did not change ipsilaterally after C3 or C5 contusion, but increased contralaterally (∼ 11%) after C3 contusion only on the first day post-injury (p = 0.026). Similarly, there were no significant changes in breathing parameters during eupnea or exposure to hypoxia (10% O2) - hypercapnia (5% CO2) at any time post-injury. Unilateral midcervical contusions minimally impair ventilatory behaviors despite phrenic motoneuron loss and diaphragm muscle denervation.
journal_name
J Neurotraumajournal_title
Journal of neurotraumaauthors
Alvarez-Argote S,Gransee HM,Mora JC,Stowe JM,Jorgenson AJ,Sieck GC,Mantilla CBdoi
10.1089/neu.2015.4054subject
Has Abstractpub_date
2016-03-01 00:00:00pages
500-9issue
5eissn
0897-7151issn
1557-9042journal_volume
33pub_type
杂志文章abstract::Accumulating evidence suggests that the extent of brain injury and the clinical outcome after traumatic brain injury (TBI) are modulated, to some degree, by genetic variants. Aquaporin-4 (AQP4) is the predominant water channel in the central nervous system and plays a critical role in controlling the water content of ...
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journal_title:Journal of neurotrauma
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journal_title:Journal of neurotrauma
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.1998.15.239
更新日期:1998-04-01 00:00:00
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.1997.14.43
更新日期:1997-01-01 00:00:00
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.1998.15.615
更新日期:1998-08-01 00:00:00
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journal_title:Journal of neurotrauma
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2014.3399
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journal_title:Journal of neurotrauma
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
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更新日期:2021-01-13 00:00:00
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
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journal_title:Journal of neurotrauma
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doi:10.1089/neu.2009.1150
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2014.3401
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
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更新日期:2011-09-01 00:00:00
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journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2015.3987
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