Color Doppler ultrasonography with cold immersion study could differentiate healthy subjects from patients with RP, and it could provide objective standards of hemodynamics for the diagnosis of RP.

• 彩色多普勒超声结合冷水激发试验能够区分正常对照与RP患者，可以为RP的诊断提供血流动力学方面的客观指标。