Geneva, March 23 -- International Clinical Trials Registry received information related to the study (ChiCTR2600119960) titled 'Determination of ED50 and ED90 effective doses of Oliceridine in elderly patients undergoing radiofrequency ablation surgery for great saphenous vein varicose veins' on March 6.

Study Type: Interventional study

Study Design: Single arm

Primary Sponsor: Anqing Municipal Hospital

Condition: Varicose veins of the great saphenous vein

Intervention: Experimental group:In this study, the initial dose of oxyryzine was set at 0.02mg/kg, and the ratio of adjacent drug doses was 1.0:1.1. If a positive body movement reaction occurred during the operation, the dose of oxyryzine for the next patient would be increased...