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- W1849526823 abstract "Previous studies suggested that phrenic motor output is largely refractory to afferent stimuli during gasping. We tested this concept by electrically stimulating the carotid sinus nerve (CSN) or the superior laryngeal nerve (SLN) of anesthetized peripherally chemodenervated vagotomized ventilated cats during eupnea or gasping induced by hypoxia. During eupnea, phrenic neurogram amplitude (PNA) increased by 110% during 30 s of supramaximal CSN stimulation, but burst frequency did not change. Progressive hypoxia caused gasping after arterial O2 content was reduced by 75%. During gasping, CSN stimulation caused premature onset of gasp in 12 of 13 trials, shortened intergasp interval [6.3 +/- 0.9 vs. 14.8 +/- 2.5 (SE) s], and resulted in a small (20%) but significant increase in PNA. Intensity of SLN stimulation was adjusted to abolish phrenic activity during the 30-s eupneic stimulation period. During gasping, SLN stimulation of the same intensity tended to delay onset of the next gasp, increased intergasp interval (16.9 +/- 1.9 vs. 13.3 +/- 1.2 s), and reduced PNA by 32%. Thus the respiratory burst pattern formation circuitry responds to afferent stimuli during gasping, albeit in a manner different from the eupneic response. These observations suggest that gasping is the output of a modified eupneic burst pattern formation circuit." @default.
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- W1849526823 date "1993-11-01" @default.
- W1849526823 modified "2023-09-23" @default.
- W1849526823 title "Effects of respiratory afferent stimulation on phrenic neurogram during hypoxic gasping in the cat" @default.
- W1849526823 doi "https://doi.org/10.1152/jappl.1993.75.5.2091" @default.
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