Conclusion Ketamine and midazolam have different effects on HRV in children, indicating enhancement of sympathetic nerve tension by ketamine and inhibition of sympathetic nerve tension by midazolam.

• 本研究拟观察氯胺酮和咪达唑仑用于儿童麻醉时对HRV的变化，并分析氯胺酮和咪达唑仑对自主神经功能的影响。