Pulmonary Thromboembolism in Immune Thrombocytopenia: A Report of Five Cases and a Review of the Literature.

Objective To provide a reference for the diagnosis and treatment of patients with immune thrombocytopenia (ITP) complicated with pulmonary thromboembolism (PTE) by analyzing the clinical characteristics of five such patients. Methods This paper summarizes the clinical manifestations and hematological indexes of five patients with ITP complicated with pulmonary embolism. Results In this study, the incidence of ITP complicated with PTE was 2.75%. All five cases were elderly patients with nonspecific clinical manifestations. Platelet counts were different when PTE occurred. The time from the diagnosis of ITP to the occurrence of PTE was from 5 to 24 months, with an average of 12.8 months. There was no significant change in hemoglobin, white blood cell levels, prothrombin time, activated partial thromboplastin time, thrombin time, fibrinogen levels, or the international normalized ratio. Four patients had significantly increased D-dimer levels, while D-dimer was only slightly increased in one patient. Antithrombin (AT) was significantly decreased in four cases (less than 70%), and C-reactive protein (CRP) was increased in all five cases. Conclusion PTE may be related to AT and CRP in patients with ITP, which is of great clinical significance to the diagnosis and treatment of ITP complicated with PTE.