Experimental records illustrating the effect of perineural capsaicin treatment (PNCT) of both cervical vagi on cardiorespiratory responses to injections of capsaicin and 2APB in an anesthetized rat. A, C and E: responses to intravenous injections of capsaicin (1 μg/kg) before, 5 min and 60 min after PNCT of both vagi, respectively. B, D and F: responses to injections of 2APB (3 mg/kg) before, 15 min and 75 min after PNCT, respectively. Rat body weight, 365 g.