Figure 4

Representative prototypes of original recordings showing the effects of 10 mM histamine (Hist) on respiration (Resp), blood pressure (BP) and electrocardiogram (ECG), after ipsilateral sciatic and femoral neurotomy (+NX), bilateral vagotomy (+VagX) and pre-treatment with lignocaine (+Ligno). The responses are shown at different time intervals as indicated in the lower panel. The points of instillation of Hist after interventions are shown by dotted lines. The horizontal line in each panel is 15 s for all parameters.