Effect of β adrenergic stimulation on the severity of caerulein induced pancreatitis: 24 hours after administration of isoproterenol, pancreatitis was induced by caerulein administration and its severity was quantitated, as described in the text, in control animals, in control animals injected with isoproterenol, in rats given caerulein, and in rats given caerulein after administration of isoproterenol. Results are expressed as a per cent of the increase noted in non-stressed animals given caerulein (that is, maximal increase). Results represent mean (SEM) values for at least three animals at each time point. *Significantly different (p<0.05) from non-stressed caerulein treated rats. MPO, myeloperoxidase.