GABA can cause early-term heart-inhibited effect and late-term heart-potentiated effect on the isolated toad hearts.

• 实验结果表明:GABA可引起早期心抑制效应和后期心加强效应。GABA_B受体激动剂氯苯氨丁酸仅引起早期心抑制效应。羟胺可显著加剧GABA的作用。