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  • Title: [Respiratory regulations of pulmonary vagal nerves under hypercapnic conditions; effects of J-receptor].
    Author: Sagara Y, Isogami K, Saito H, Ono S, Sakuma T, Koike K, Nakata T.
    Journal: Kokyu To Junkan; 1989 Nov; 37(11):1221-4. PubMed ID: 2513627.
    Abstract:
    We studied ventilatory responses under hypercapnic condition in 9 lightly anesthetized dogs, using a vagal nerve cooling technique. One side of the cervical vagosympathetic trunks of dogs were previously severed, and a copper cooler was attached to the other side. When the cervical nerve was cooled below 7 degrees C, the Hering-Breuer inflation reflex ceased. We found that when the vagal nerve was not cooled or cooled to 7 degrees C, the respiratory frequency increased significantly in relation to hypercapnic gas inhalation. However, the increment of respiratory frequency was reduced by bilateral cervical vagotomy. We concluded that the J-receptor is responsible for the increase in respiratory frequency under hypercapnic gas inhalation.
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