Pseudothrombocytopenia in Case of Acute Viral Hepatitis A/Akut Hepatit A Virus Enfeksiyonu Olgusunda Psodotrombositopeni.
Hematology laboratories have got its share from the recently emerging developments in technology. Thus, electronic blood count devices have become frequently used equipment. The interpretation of findings of these devices which get much truer results in a shorter span of time compared to earlier devices may sometimes cause problems (1). Although thrombocytopenia does not occur actually, the number of thrombocyte may be low in counts. Unreal thrombocytopenia must be doubted for patients who have thrombocytopenia but not petechia and ecchymosis. Even if this case may take place in the presence of huge blood platelets and their satellitosis, the most frequently seen factor is aggregation of thrombocyte (pseudothrombocytopenia). The aggregation of thrombocyte in pseudothrombocytopenia comes into existence with anticoagulant-dependent thromboagglutinin. It is mostly seen when ethylenediaminetetraacetic acid (EDTA) is used as an anticoagulant. As aggregated thrombon are perceived as leucocyte in blood count devices because of their volume, the number of thrombocyte is low (2). Pseudothrombocytopenia is an iatrogenic laboratory phenomenon. It does not have a risk of haemorrhagia and necessitate thrombocyte to be supplied. However, that the case becomes unrecognizable ends up with unnecessary further examination and treatment of patients. Therefore, pseudothrombocytopenia is an important clinical problem. We aim at presenting a child case in which pseudothrombocytopenia develops as a result of hepatitis A virus (HAV) infection.
Liver function disorder (hepatitis) and thrombocytopenia were detected in a 9-year-old boy in state hospital where he had gone due to stomachache and he was transferred into our department in order that thrombocytopenia's reason (thrombocyte 70 x [10.sup.9]/L) was searched. There were no epistaxis, melena, hematuria, ecchymosis and drug utilization in the patient and history of hemorrhagic diathesis in the family. In patient's examination, the liver was 3-4 cm under rib. There were not any symptoms (petechia, purpura and ecchymosis) connected to the haemorrhagia and lymphadenopathy in any parts of his body. In the patient, leucocyte was 6.52 x [10.sup.9]/L, hemoglobin was 147 g/L, hematocrit was 46.6%, thrombocyte was 58 x [10.sup.9]/L, aspartate transaminase was 79.8 U/L, alanine transaminase was 116.9 U/L, gamma-glutamyl transferase was 156 U/L, alkaline phosphatase was 1114 U/L, total bilirubin was 0.98 mg/dL, direct bilirubin was 0.6 mg/dL and other biochemistry values were all normal. Anti-HAV immunoglobulin M and immunoglobulin G was positive. A lot of thrombocyte clumps in 10-20 were seen in peripheral smear of the patient regarded as an infection of hepatitis A (Figure 1). In the patient for whom pseudothrombocytopenia is considered, thrombocyte satellitosis and macrothrombocyte were not observed. In the venous blood taken into citrated tube, the number of thrombocyte was got as 101 x 109/L by an automatic instrument. It was considered that HAV infection had caused pseudothrombocytopenia. Hence, pseudothrombocytopenia started to get better as HAV infection regressed and thrombocyte numbers have mounted over 150 x [10.sup.9]/L after one year.
Seventeen percent of patients evaluated because of thrombocytopenia were diagnosed of pseudothrombocytopenia in a study conducted by Cohen et al. (3). Holmes et al. (4) stated pseudothrombocytopenia as 0.1% in general population, but Bragagni et al. (5) stated it as 1.26% for hospitalized patients. This is seen at the rate of (1/1000) in healthy individuals depending upon autoimmune, neoplastic, hepatic and cardiovascular diseases, infections, obstetric problems and drug use (2). The combined strength that low temperature and EDTA generate when they attach to calcium ions releases glycoprotein lib epitope by affecting glycoprotein llb/llla molecule which is normally hidden and occupies thrombocyte area. If autoantibody exists against this epitope in the individual, antibody causes thrombon to aggregate by attaching to them (2). The relation between viral infections and pseudothrombocytopenia depending on EDTA has been stated in few cases in literature. Tomonari et al. (6) reported a case of pseudothrombocytopenia dependingon EDTA in the course of hepatitis Ainfection. In another study conducted on viral infections causing pseudothrombocytopenia, hepatitis A in 72.2% of cases, cytomegalovirus in 11.1% and influenza A H1N1 infection in 5.6% were detected (7). Although its exact incidence is not known in childhood, it is determined more rarely. Natural antibodies causing aggregation in thrombon connected with EDTA appear normally in people at the rate of 1/1000. They may be permanent for the life as well as they may appear due to infection and drug use and then disappear (1). Also, in our case, the antibody developing after infection lost its efficiency when thrombon were detected as normal about one year later. There are a few methods for the diagnosis of pseudothrombocytopenia. The most frequently used one is to detect the aggregation which is normally not supposed to exist in peripheral smear from the tube with EDTA taken for hemogram. In smears from heparin containing or citrated tubes, thromboagglutination may not be monitored. But, an aggregation may be monitored in smears done with other anticoagulants in small parts of cases, too. Pseudothrombocytopenia may be discovered at the rate of 20% in even counts repeated in a citrated tube (8). Similarly, thrombocyte count higher than the one with EDTA but lower than normal values was detected in the count repeated in the citrated tube in our case. In cases of thrombocytopenia without clinical findings, pseudothrombocytopenia must be excluded firstly. This prevents unnecessary examination and treatment procedures. The pathogenesis of pseudothrombocytopenia is not completely clear. However, it may be seen during some clinic outlooks where viral infections are situated. In countries like ours where acute HAV infection is endemic, as in our case, pseudothrombocytopenia depending upon EDTA may be observed rarely in the course of acute HAV infection Consequently, pseudothrombocytopenia should be taken into consideration for cases that do not have the symptom of thrombocytopenia but have low thrombocyte count. In cases with thrombocytopenia in medical and family history, consideration of peripheral smear is very important and should be the first step.
Peer-review: Externally and internally peer-reviewed.
Informed Consent: Informed consent was obtained from patients' parents who participated in this case.
Financial Disclosure: The author declared that this study has received no financial support.
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[iD] Zafer Bicakci
Kafkas University Faculty of Medicine, Department of Child Health and Diseases, Kars, Turkey
Address for Correspondenee/Yazisma Adresi: Zafer Bicakci MD, Kafkas University Faculty of Medicine, Department of Child Health and Diseases, Kars, Turkey
E-mail : email@example.com
Received/Gelif Tarihi: 08.01.2015
Accepted/Kabul Tarihi: 10.03.2015
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|Title Annotation:||Case Report / Olgu Sunumu|
|Publication:||Meandros Medical and Dental Journal|
|Date:||Apr 1, 2018|
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