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Related Experiment Videos

Lesions in retrotrapezoid nucleus decrease ventilatory output in anesthetized or decerebrate cats.

E E Nattie1, A H Li, W M St John

  • 1Department of Physiology, Dartmouth Medical School, Hanover, New Hampshire 03756.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1991
PubMed
Summary
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The retrotrapezoid nucleus (RTN) is crucial for maintaining breathing and CO2 sensitivity. Lesions to the RTN significantly impair phrenic activity, highlighting its essential role in respiratory control.

Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • Kainic acid (KA) injections into the retrotrapezoid nucleus (RTN) previously demonstrated profound decreases in phrenic activity (PA) and CO2 sensitivity in anesthetized cats.
  • Electrolytic lesions confirmed that KA destroyed RTN cells, prompting further investigation into the nucleus's role.

Purpose of the Study:

  • To determine if anesthetic depression or lack of peripheral chemoreceptors explained the observed respiratory depression.
  • To investigate the necessity of the RTN for eupneic phrenic activity and CO2 sensitivity.

Main Methods:

  • Electrolytic lesions and KA injections were performed on the RTN in decerebrate cats.
  • Peripheral chemoreceptors were denervated to assess their contribution.
  • Phrenic activity, CO2 sensitivity, and blood pressure were monitored.

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Main Results:

  • RTN lesions in decerebrate cats decreased PA similarly to anesthesia.
  • Lesions extending into the caudal RTN reduced CO2 sensitivity, though less than anesthesia.
  • KA injections caused an initial PA increase followed by a decrease, with absent CO2 sensitivity.
  • Peripheral chemodenervation caused minor PA decrease and CO2 response shift.
  • Blood pressure was unaffected by RTN lesions but decreased with more caudal lesions.

Conclusions:

  • The RTN is essential for maintaining normal breathing (eupneic phrenic activity) and CO2 responsiveness.
  • These findings hold true even in decerebrate animals with intact peripheral chemoreceptors.
  • The RTN plays a vital role in central respiratory control.