[Determination of airway reactivity in the conscious and unrestrained guinea pigs]

A simple, stable determining system in the conscious and unrestrained guinea pigs was established that can quantitatively analyse the airway reactivity (AR). In this model, the response to histamine (His) or acetylcholine (ACh) aerosol was concentration-dependent with EC50 effective concentration causing 50% animals wheezing) of 53.3 mumol/m3 and 269 mumol/m3 respectively.