Figure 4From: Fentanyl enhances the excitability of rapidly adapting receptors to cause cough via the enhancement of histamine release in the airwaysEffect of fentanyl on the level of histamine in BALF. BALF was obtained by injecting 2 ml of ice-cold physiological saline (1 ml, twice) via a tracheal cannula 30 min after i.v. injection of fentanyl (5 μg/kg). Each column represents the mean with S.E.M (n = 10). * P < 0.05 vs. vehicle (saline)-treated group.Back to article page