Fig. 1.
Experimental records illustrating the responses of a capsaicin-sensitive lung vagal (CSLV) afferent to the right atrial bolus injection of capsaicin (0.75 μg/kg, arrows) before and 5 and 30 min after the termination of airway exposure to aerosolized sodium hydrosulfide (NaHS, a donor of H2S) in an anesthetized, artificially ventilated rat. A and B: inhalation of aerosolized NaHS (5 mg/ml, 3 min) and its vehicle (saline), respectively. AP, action potential; Ptr, tracheal pressure; ABP, arterial blood pressure. Note that the afferent response to capsaicin was enhanced 5 min after NaHS inhalation but was not affected after vehicle inhalation.