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Figure 1: Changes of heart rate after administration of 0.8 mcg/kg of sufentanil. (a) The heart rate decreased maximally (42 s after injection of sufentanil; arrow) and increased slowly. (b) The heart rate decreased maximally in 40 s after administration (arrow) of sufentanil and remained at the same rate

Figure 1: Changes of heart rate after administration of 0.8 mcg/kg of sufentanil. (a) The heart rate decreased maximally (42 s after injection of sufentanil; arrow) and increased slowly. (b) The heart rate decreased maximally in 40 s after administration (arrow) of sufentanil and remained at the same rate