Fig. 5.

Opioid blockade reverses EA inhibition of visceral induced elevations in BP following conversion to responders by devazepide. A: opioid blockade eliminated EA inhibition of viscerally induced elevations in BP following conversion to responders by devazepide. Letters a–d displayed in the bars of the histogram correspond with blood pressure tracings a to d. Arrows indicate time of gastric distension application. B: vehicle and saline microinjected into the rVLM do not modify the nonresponsiveness to EA. *Significant difference, P < 0.05, compared with controls before EA. #Significant difference, P < 0.05, compared with vehicle group.