کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9429737 1297058 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Augmented breath phase volume and timing relationships in the anesthetized rat
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Augmented breath phase volume and timing relationships in the anesthetized rat
چکیده انگلیسی
Augmented breaths (ABs), or sighs, are airway protective reflexes and part of the normal repertoire of respiratory behaviors. ABs consist of two phases, where phase I volume and timing resembles preceding eupnic breaths, and phase II is an augmenting motor pattern and occurs at the end of phase I. Recent evidence suggest multiple respiratory motor patterns can occur following dynamic functional reconfiguration of one respiratory neural network. It follows that the response of the respiratory network to modulatory inputs also may undergo dynamic reconfiguration. We hypothesized that lung-volume related feedback during ABs would alter AB timing differentially during phase I and II. We measured phase I and II volumes and durations in urethane anesthetized rats with decreased lung volume secondary to three models of varying phrenic motor impairment (spinal injury alone, unilateral phrenicotomy, and combined injuries). AB phase I and II inspired volume were decreased after phrenic motor impairment (p < 0.05). In contrast, only phase I duration following injury was altered compared to controls. Phase II duration remaining unchanged despite the greatest effect of injury on volume occurring during phase II. Thus, sigh volume-timing relationships differ between phases of an augmented breath suggesting that the response of the respiratory network to modulatory inputs has changed. These data support the hypothesis that multiple respiratory behaviors occur following dynamic reconfiguration of the respiratory neural network.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience Letters - Volume 373, Issue 2, 10 January 2005, Pages 89-93
نویسندگان
, , , , ,