Immune Thrombocytopenia Due to Mycoplasma Pneumoniae Infection
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Turkiye Klinikleri J Case Rep. 2019;27(2):87-91 CASE REPORT DOI: 10.5336/caserep.2018-62277 Immune Thrombocytopenia Due to Mycoplasma pneumoniae Infection Hakan SARBAY a, ABS TRACT Mycoplasma pneumoniae is one of the major causes of lower and upper respiratory Mehmet EROL b tract infections in children. The most common type of the infection is a lower respiratory tract in - fection. But also Mycoplasma pneumoniae can be associated with extrapulmonary manifestations even in 25% of patients. Hemolytic anemia, thrombocytopenia, dissemine intravascular coagulation Clinics of and hemophagocytic syndrome are the most common hematologic complications. In this article, a a Pediatric Hematology and Oncology, patient with Mycoplasma pneumoniae pneumonia and immune trombocytopenia is described be - b Child Intensive Care Unit, cause of its rare occurrence and different clinical features. Diyarbakır Children's Hospital, Diyarbakır, TURKEY Keywords: Immune thrombocytopenic purpura; Mycoplasma pneumoniae ; thrombocytopenia Re ce i ved: 30.07.2018 Received in revised form: 23.09.2018 Ac cep ted: 02.10.2018 Available online : 28.06.2019 Cor res pon den ce: ycoplasma pneumoniae is one of the main agents of lower and Hakan SARBAY Diyarbakır Children's Hospital, upper respiratory tract infections in children. It is more fre - Clinic of Pediatric Hematology and quently found in school age children and young adults, but is Oncology, 1 Diyarbakır, TURKEY rarely seen under 5 years of age. The incubation period is usually 2-3 weeks. [email protected] Symptoms are variable and most commonly presented with cough, weak - ness, fever and headache. Mycoplasma pneumoniae infections are seen only th in humans, and it spreads through aerosols . Outbreaks can be seen in pub - This case poster was presented in the 6 2 National Pediatric Hematology Symposium lic areas such as barracks, schools. (3-6 May, 2018, Adana, Turkey). The most common type of the infection is respiratory tract infection. But also Mycoplasma pneumoniae can be presented with extrapulmonary manifestations even in 25% of patients. Mycoplasma pneumoniae cause these complications with different immune mechanisms .3 Extrapulmonary complications are encephalitis, transverse myelitis, meningitis, Guillain- Barré syndrome, nausea, diarrhea, vomiting, pancreatits and hepatitis. Other complications can manifest as erythema nodosum, urticaria , myocarditis, pericarditis, arthritis and hematological complications . Hemolytic anemia, thrombocytopenia, diffuse intravascular coagulation and hemophagocytic syndrome are the most common hematologic complications. 4 In this article, a patient with Mycoplasma pneumoniae pneumonia and immune trombo - cytopenia (ITP) was presented because of its rare occurrence and different Cop yright © 2019 by Tür ki ye Kli nik le ri clinical features. 87 Hakan SARBAY et al. Turkiye Klinikleri J Case Rep. 2019;27(2):87-91 also did not develop bruising, or severe bleeding CASE REPORT during admission. The control platelet count after A 2-year-old girl presented to the hospital with a IVIG was 35x10 9/L . After she completed a 7 -day persistent fever for 3 days. She had cough and course of piperacillin-tazobactam and clarithromy- fever. Her mother reported that she had developed cin in hospital, she was afebrile with a normal ex - cough for a few days before the onset of her fever . amination. Her platelet count revealed 124x10 9/L . Her immunizations were up to date, according to Mycoplasma pneumoniae IgM positivity was de - the schedule. She was febrile at 39°C , tachycardic tected in serological tests ELISA (Enzyme-Linked and her respiratory rate was 3 0 per minute. There ImmunoSorbent Assay). Clinical, laboratory and was no lymphadenopathy. A skin examination re - radiological studies were also found to be compat - vealed mild petechiae . Her abdomen was mildly ible with Mycoplasma pneumoniae infection. She tender, and distended with no organomegaly. She completed a total 14-day course of clarithromycin. was oriented, neurological examination was nor - IVIG was repeated because of the decrease in mal. She had no bone or joint pain or swelling. platelet count at 3 weeks after first dose . Treatment Complete blood count revealed a white blood cell with a dose of 1 g/kg/day resulted in a suspected count of 7 .07 x10 9/L, hemoglobin of 9.7 g/dl, and a 9 allergic reaction and fever. Therefore treatment platelet count of 19x10 /L . No blasts were identi - was contin ued with methylprednisolone at 4 fied in the blood smear, and platelet morphology mg/kg/day for 5 days after bone marrow examina - was within the normal range, with 1-2 large tion on day 22 of treatment . Bone marrow aspira - platelets per field . Further laboratory evaluation tion smear showed increased mature and immature was prothrombin time (PT): 12.1 s, INR: 1.1, partial megakaryocytes was consistent with ITP ( Figure 2 ). thromboplastin time (PTT) : 28 s, aspartate transam - The platelet count of the patient on follow-up was inase (AST): 44 IU/L, alanine transaminase (ALT): shown ( Table 1). Second day of methylprednisolone 33 IU/L, lactate dehydrogenase (LDH): 26 4 U/L, platelet count revealed 62x10 9/L and, platelet count and erythrocyte sedimentation rate: 74 mm/h, was 445x 10 9/L on fifth day of treatment. Informed urea: 22 mg/dL, cre atinine: 0.3 mg/dL, B12, and consent was obtained from patient relatives. folic acid levels were normal. No evidence of viral infections-including the Hepatitis virus A, DISCUSSION Hepatitis virus B, Hepatitis virus C, Epstein-Barr, Rubella, and Cytomegalovirus-was found . Frontal Immune thrombocytopenic purpura is an autoim - chest radiograph showed a diffuse pattern of in - mune disease characterized by autoantibody- creased interstitial markings ( Figure 1 ). Empiric treatment of piperacillin-tazobactam and clar - ithromycin was started with diagnosis of pneumo - nia according to age group by doctors of intensive care unit . The patient continued to have fever spikes to 39-40 °C every 5-6 hours after admission until the third day. Since platelet count was 19 x10 9/L and it was in the period of acute infection, first platelet transfusion was given considering infectious thrombocytopenia. Intravenous immunoglobulin (IVIG) was given at 0.6 mg/kg/day for 3 days when there was decrease to 10x10 9/L . She was monitored closely for complications associated with thrombo - FIGURE 1: Frontal chest radiograph shows a diffuse pattern of increased inters - cytopenia: she had minimal petechial lesions but titial markings. 88 Hakan SARBAY et al. Turkiye Klinikleri J Case Rep. 2019;27(2):87-91 were considered. The PT-PTT values were in the normal range and there was no evidence of diffuse intravascular coagulation. When compared to thrombocytopenia secondary to infection, platelet counts were very low, and the number of megakaryocytes increased more than expected in bone marrow smear. For this reason thrombocy - topenia secondary to infection wasn’t considered. No blasts were identified in the blood smear, and platelet morphology was within the normal range, Bone marrow smear reveals increased immature-mature megakar - FIGURE 2: with 1-2 large platelets per field. There were no ab - yocytes (May-Grünwald & Giemsa x100). normally giant platelets and Döhle bodies that would suggest a macrotrombocytopenia syndrome. coated thrombocytes being destroyed in the retic - In our patient, platelets at different sizes (normal uloendothelial system and decreasing the platelet and large) were seen in peripheral blood smear 5,6 count. ITP is one of the most common hemato - compatible with ITP in contrast to macrothrom - logic disorders in childhood. Incidence of ITP is 4- bocytopenia syndromes. Also malignancy was not 7 8 per 100.000 children each year. 50-80% of newly considered in the clinical and laboratory findings. diagnosed ITP patients have a history of infection In a study of 2031 patients with diagnoses ITP, in the last 1-3 weeks. Non-specific respiratory tract mean age of diagnosis was 5.7. 9 Demircioğlu et al . infections are the most common cause of ITP . Spe - reported that male/female ratio is 1.5 in their cific infections such as rubella, mumps, measles, study .10 The most common complaints were pe - pertussis, varicella, Ebstein-Barr virus , parvovirus, techial-ecchymosis (83%), epistaxis (25%), hema - cytomegalovirus, hepatitis A, B, C or bacterial in - turia (4%). Severe gastrointestinal and intracranial fection can be detected in 20% of patients .8 In our hemorrhage can be seen in some of the patients. 11 case, Mycoplasma pneumoniae IgM positivity was Our case is a 2 year old girl who has a common age detected in serological tests. Definite diagnosis of distribution in terms of ITP. She had minimal pe - Mycoplasma pneumoniae infection requires either techial lesions but also did not develop bruising, or PCR (Poli merase chain reaction), special culture severe bleeding during admission. isolation or serologic tests using immunofluores - cence and enzyme immunoassays that detect IVIG and corticosteroids are usually used in immunoglobulin IgM and IgG . Mycoplasma pneu - the treatment of ITP . The initial dose for IVIG is moniae IgM antibodies indicate recent infection, 0.8-1 g/kg, and the duration of treatment is deter - but also false-positive test results may occur. 1 Nev - mined by the platelets count follow-ups . Steroids ertheless clinical, laboratory and radiological stud - are used in the literature at different doses, with 1- ies were found to be compatible with Mycoplasma 2 mg/kg/day being the most frequently used for pneumoniae infection. In differential diagnosis, several weeks in divided doses .5 Scoring systems thrombocytopenia secondary to infection, malig - have been developed to detect the severity of nancy and macrothrombocytopenia syndromes thrombocytopenia and reduce the risk of bleeding TABLE 1: Platelet- WBC counts, Fever peaks, antibiotics according to treatment days. Day 1234722 23 26 52 Treatment Platelet transfusion IVIG 0.6 g/kg/d IVIG 0.6 g/kg/d IVIG 0.6 g/kg/d IVIG 1 g/kg/d Methylprednisolone Methylprednisolone 4 mg/kg/d 2.day 4 mg/kg/d 5.day Platelet x10 9/L 19 10 35 124 329 22 62 445 326 89 Hakan SARBAY et al.