Extreme thrombocytosis in a traumatic patient

Corresponding author: Hyun-Hea Kim, M.D., Department of Anesthesiology and Pain Medicine, CHA Gumi Medical Center, CHA University, 855, Hyeonggok-dong, Gumi 730-728, Korea. Tel: 82-54-450-9684, Fax: 82-54-450-9990, E-mail: [email protected] This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http:// creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. CC Encountering abnormally high values of platelet in patients who do not have a clonal hematologic disease is a phenomenon known as secondary or reactive thrombocytosis, which is considered a normal response after inflammatory insults, such as infection, surgery, or trauma [1]. After trauma, development of thrombocytosis is common, as reported in the prior studies, in which about 20% of patients had a platelet count above 450,000/μl, and with respect of extreme thrombocytosis (platelet count above 1,000,000/μl), the incidence is approximately 1.4-5.7% in trauma patients [1,2]. The anesthesiologists have to consider whether this condition be managed with anticoagulants to prevent thromboembolic event. We report our experience of perioperative management of a patient with reactive thrombocytosis. An 83-year-old woman was scheduled for dynamic hip screw fixations for right intertrochanteric fracture. Her medical and surgical histories were uneventful. The baseline laboratory investigations revealed extreme thrombocytosis (platelet count 1,430,000/μl), borderline derangement in coagulation parameter (aPTT 46.4 sec, 1.20 INR) and marginal leukocytosis. Preoperative electrocardiogram and chest radiograph were unremarkable. Despite the marked thrombocytosis, physical examination revealed no evidence of arterial occlusive disease. We considered the thrombocytosis due to secondary cause trauma; because the patient experienced trauma, there was no previous medical history, and the C-ractive protein was elevated. We recommended using anticoagulant in the perioperative period because the patient was an old woman with femur fracture, but anticoagulant was not used due to a fear of bleeding tendency. The patient underwent an operation under general anesthesia. The induction of anesthesia was performed with propofol and rocuronium. After a tracheal intubation, the left radial artery was cannulated. Anesthesia was maintained with sevoflurane in N2O/oxygen. There was no significant intraoperative event and the recovery from anesthesia was uneventful. During a perioperative period, we had closely observed the patient to observe whether the deep vein thrombosis or arterial occlusive events developed. There was no thromboembolic complication on the postoperative 9 months follow-up. The platelet count was gradually decresed and laboratory studies demonstrated an normal platelet count (434,000/μl) on the 39 postoperative day. So, should this condition be managed with anticoagulant to prevent thromboembolic or other events? If the extreme thrombocytosis is caused by reactive throm bocytosis, there is no evidence showing any benefit to anticoagulant therapy, and then a significantly higher incidence of wound infections was reported in patients who were treated with aspirin, compared with patients who were not [1]. Despite some dissenting reports [3], it is a more common conclusion that secondary thrombocytosis is not elevated risk of thromboembolic complication, patients with reactive thrombo cytosis, developing thrombotic complications, had additional risk factors [4,5]. But in the perioperative period, close observation of whether throm boembolic complication occurs, as well as regular monitoring of platelet count is needed. And possibly, anti-coagulation drug for the patients with additional risk factor may be useful.