Abstract
A blood pressure monitoring system was developed for studying antagonist effects against platelet activating factor (PAF), a chemical mediator of anaphylactic hypotension. Using this system, we were able to determine the inhibitory effects of a 35% ethanol extract (IB) from the petals of Impatiens balsamina L. against PAF-induced hypotension and the active principal compounds from IB. One mechanism of the antianaphylactic effects of IB was characterized as PAF-antagonist effects.
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