Lege Artis Medicinae

[JAK2 V617F: a new risk factor of stent thrombosis?]

PINCZÉS István, FEKETE Viktória, ZÁMOLYI Károly

MARCH 20, 2011

Lege Artis Medicinae - 2011;21(03)

[INTRODUCTION - Although the introduction of stents has dramatically improved the efficiency of percutaneous coronary interventions, a new complication, the stent thrombosis has appeared. Owing to intensive research, the incidence of this previously common complication is currently 1%. Because of the high mortality and morbidity, it is important to find more and more predictors, which might help to further reduce the incidence. CASE REPORT - Our elderly male patient presented with acute anterior myocardial infarct. Stent implantation of the left anterior descendent branch was performed using coronarography, with no complications. After five days without any symptoms, ST elevation recurred and subacute stent thrombosis was deteceted. Because of the laboratory results showing thrombocytosis, we performed JAK2 V617F screening, with a positive result. Prolonged heparin therapy, platelet aggegation inhibition at a transiently elevated dose and hydroxyurea treatment because of the myeloproliferativ malignancy were used. At the follow-up visit, the patient did not report any complaints, and cell counts for all three myeloid cell lines were in the normal range. CONCLUSION - The thrombogenic feature of the classic myeloproliferative disorders is well-known, and JAK2 V617F mutations further increase the risk. In our departement, screeing for such genetic alteration was performed in patients with stent thrombosis and a platelet count higher than 450 G/l. Two of the three cases had positive results. Supported by the literature, we think that the hematologic disease lead to the thrombotic complication in our patients. In our opinion, the JAK2 V617F is a potential risk factor of stent thrombosis.]

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