患儿男,8岁,因双下肢紫癜并双膝关节肿胀3天就诊,诊断为过敏性紫癜。给予抗生素、肾上腺皮质激素及抗过敏药物治疗。第3天关节肿痛消失,第5天下肢皮疹消失,第8天突然双手指和双足趾疼痛难忍,疼痛呈发作性,3～5次/日,每次持续3～5分钟。患者体温正常,血压13/8kPa,心肺腹均未见异常。发作时双肘、桡动脉脉搏良好,双手指和双足趾末端2/3初苍白 Male, 8 years old, was diagnosed with anaphylactoid purpura due to bilateral purpura and double knee swelling for 3 days. Given antibiotics, adrenal hormones and anti-allergy medication. On day 3, the joint pain disappeared. On the fifth day, the lower extremity rash disappeared. On the eighth day, the pain of two fingers and the both toe were suddenly unbearable. The pain was episodic 3 to 5 times per day for 3 to 5 minutes. The patient’s temperature was normal, blood pressure 13 / 8kPa, no abnormal heart and lung abdomen. Elbow attack, radial pulse pulse well, both hands and fingers and two toe end of the first pale pale