Responses to inflation of vagal afferents with endings in the lung of dogs

Marc P Kaufman, G. A. Iwamoto, J. H. Ashton, S. S. Cassidy

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52 Scopus citations

Abstract

In dogs, inflating the lungs to pressures of 9 cm H2O or less reflexly increases heart rate, whereas inflating the lungs to pressures of 10-30 cm H2O reflexly decreases heart rate. The afferent fibers responsible for the cardioacceleration travel in the vagus nerves and are believed to be pulmonary stretch receptors, whereas the afferents responsible for the deceleration also travel in the vagus nerves, but are believed to be lung C-fibers. To identify the afferents responsible for these effects, we recorded the impulse activity of vagal afferents with endings in the left lung, while we slowly inflated that lung to 30-45 cm H2O. We found that 12 slowly adapting receptors fired at significantly lower inflation pressures than did 10 rapidly adapting receptors (5.8 ± 1.5 vs. 13.5 ± 2.2 cm H2O, respectively). We also found that 13 pulmonary C-fibers fired at significantly lower inflation pressures than did 10 bronchial C-fibers (16.4 ± 1.8 vs. 26.5 ± 2.9 cm H2O, respectively). We conclude that slowly adapting receptors are likely to be responsible for the cardiodecceleration evoked by low levels of inflation, and that both pulmonary and bronchial C-fibers are likely to be responsible for the cardiodeceleration evoked by high levels of inflation.

Original languageEnglish (US)
Pages (from-to)525-531
Number of pages7
JournalCirculation Research
Volume51
Issue number4
StatePublished - 1982
Externally publishedYes

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ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Kaufman, M. P., Iwamoto, G. A., Ashton, J. H., & Cassidy, S. S. (1982). Responses to inflation of vagal afferents with endings in the lung of dogs. Circulation Research, 51(4), 525-531.