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Long-Term Results of Initial and Repeated Partial Splenic Embolization for the Treatment of Chronic Idiopathic Thrombocytopenic Purpura

¹ All authors: Department of General Surgery, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670 Japan.

OBJECTIVE. Although splenectomy is a standard surgical treatment for chronic idiopathic thrombocytopenic purpura, partial splenic embolization is another treatment option. We retrospectively studied the long-term results of initial and repeated partial splenic embolization.

MATERIALS AND METHODS. Thirty-nine patients, 15 men and 24 women, underwent initial embolization; 12 of the 39 underwent a repeated embolization. The therapeutic effects of the initial and repeated embolization were classified as a complete response if the patient's platelet count rose to more than 10 x 10⁴/µL without medication 1 year after the initial or repeated embolization, as a partial response if the platlet count reached 5-10 x 10⁴/µL under the same circumstances, or as no response.

RESULTS. Twenty patients (51%) responded to the initial embolization (complete response in 11 and partial response in nine). No significant differences were found between those patients who responded to the treatment (responders) and those who did not respond to the treatment (nonresponders) in age, sex, lowest platelet counts, and steroid response before embolization. Peak platelet response was significantly higher in the responders (p = 0.029). One of the 11 complete responders and five of the nine partial responders relapsed after a median follow-up period of 34 months (range, 15-23 months) and underwent repeated embolization, resulting in complete response in one patient, partial response in the remaining four patients, and no response in one patient. However, in the six nonresponders (to the initial embolism), repeated embolization elicited a partial response in only one patient. The remission rate of 51% was maintained by means of repeated embolization for a median follow-up period of 76 months after the initial embolization.

CONCLUSION. Partial splenic embolization combined with repeated embolization may be an effective alternative to splenectomy in the treatment of chronic idiopathic thrombocytopenic purpura.

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