Results of high-altitude climate treatment of immune thrombocytopenia in children in the Kyrgyz Republic (five-year analysis)

Author(s):  
А.К. Эсенгелди

Введение: Вопрос о дальнейшем совершенствовании базисной терапии иммунной тромбоцитопении (ИТП) по-прежнему широко обсуждается специалистами и является предметом оживленных дискуссий. Цель исследования: оценить эффективность высокогорной климатотерапии при хронической ИТП у детей за 5-летний период наблюдения после ежегодного лечения на высокогорной базе. Материалы и методы: В исследование включено 22 ребенка с хронической ИТП в возрасте от 3 до 14 лет, средний возраст — 6,30 ± 1,02 года, длительность заболевания 2-8 лет. Для лечения детей поднимали на высокогорную базу. Продолжительность лечения в высокогорье составляла 40 дней. Результаты: Из 22 детей, получивших 5 курсов высокогорной климатотерапии, у двоих наблюдали полную ремиссию в виде увеличения тромбоцитов более 100×109/л без кровоточивости. Объективный ответ в виде двукратного увеличения числа тромбоцитов, но менее 100×109/л без кровоточивости установлен у 18 детей, отсутствие эффекта было зарегистрировано у 2 детей. Заключение: Повторные курсы высокогорной климатотерапии способствуют улучшению клинической картины, существенному повышению числа тромбоцитов в периферической крови и достижению ремиссии при ИТП у детей. Background: Further development of basic treatment of immune thrombocytopenia (ITP) is still widely discussed by specialists and is the subject of lively discussions. Objectives: to assess the effi ciency of high-altitude climatotherapy in children with chronic ITP for a 5-year follow-up period after annual treatment at high-altitude base. Patients/Methods: The study included 22 children with chronic ITP from 3 to 14 years, the average age was 6.30 ± 1.02 years, and disease duration was 3-8 years. Children were raised to high-altitude base. Treatment duration was 40 days. Results: 22 children received 5 courses of high-altitude climatotherapy. Complete remission was observed in 2 patients with increasing of platelets more than 100×109/L without bleeding. In 18 children an objective response was found in the form of twofold increasing of platelets number, but less than 100×109/L without bleeding; no effect was recorded in 2 children. Conclusions: Repeated courses of high-altitude climatotherapy improve clinical characteristics, significantly increase the number of platelets in the peripheral blood and contribute to remission in children with ITP.

Author(s):  
С.М. Маматов ◽  
А.К. Эсенгелди ◽  
А.А. Махмануров

Введение. Вопрос о дальнейшем совершенствовании базисной терапии идиопатической тромбоцитопенической пурпуры (ИТП) по-прежнему широко обсуждается специалистами и является предметом оживленных дискуссий. Цель исследования: изучить динамику геморрагического синдрома и количества тромбоцитов у детей с ИТП в процессе высокогорной климатотерапии и оценить эффективность воздействия высокогорной гипоксии на течение болезни. Материалы и методы. В исследование включено 24 ребенка с хронической ИТП в возрасте от 5 до 14 лет (средний возраст — 10,25 ± 1,43 года) с длительностью заболевания от 4 до 8 лет. Для лечения детей поднимали на высокогорную базу Туя-Ашу (перевал Туя-Ашу, 3200 м над уровнем моря). Продолжительность лечения в высокогорье составляла 40 дней. Результаты. К концу срока пребывания в горах значительно уменьшались проявления геморрагического синдрома, полностью купировался анемический синдром, количество тромбоцитов достоверно увеличивалось с минимума 22,1 × 109/л до максимума 108,4 × 109/л. Заключение. Из 22 детей, получивших высокогорную климатотерапию, у 2 детей достигнута полная и у 15 — частичная ремиссия. У 4 детей улучшение клинико-гематологических показателей носило временный характер, и отсутствие эффекта зарегистрировано у 1 ребенка. Ремиссия достигнута у 77% больных детей. Introduction. Further improvement of the basic therapy of idiopathic thrombocytopenic purpura (ITP) is still widely discussedby specialists and is the subject of lively discussions. Aim: to study the dynamics of hemorrhagic syndrome and platelet count in children with ITP in the process of high-altitude climatotherapy and assess the eff ectiveness of high-altitude hypoxia exposure on the course of the disease. Materials and methods. The study included 24 children with chronic ITP aged 5 to 14 years (mean age — 10.25 ± 1.43 years) with disease duration from 4 to 8 years. For treatment children were raised to Tuya-Ashu high-altitude base (mountain pass Tuya Ashu, 3200 m above sea level). The duration of treatment in highlands was 40 days. Results. By the end of the treatment, the manifestations of hemorrhagic syndrome decreased signifi cantly, the anemic syndrome completely stopped, the platelet count increased significantly from minimum of 22.1 × 109/L to maximum of 108.4 × 109/L. Conclusion. High-altitude climatotherapy received 22 children, 2 children had complete remission and 15 — part remission. In 4 children the improvement of clinical and hematological parameters was temporal, and the absence of eff ect was registered in 1 child. Remission was achieved in 77% of ill children.


Blood ◽  
2021 ◽  
Vol 138 (Supplement 1) ◽  
pp. 4061-4061
Author(s):  
Erika Wall ◽  
John Podstawka ◽  
Haowei Linda Sun

Abstract INTRODUCTION Immune thrombocytopenia (ITP) is a hematological disease characterized by immune-mediated destruction of platelets. Prior to starting therapy for ITP it is critical to determine whether it is idiopathic or related to a secondary underlying condition as this informs treatment. There is significant use of blood products and components in patients with chronic ITP for management of thrombocytopenia and bleeding, including intravenous immune globulin (IVIg). Platelet transfusions are generally reserved for life-threatening bleeding or may be used in the preoperative setting in patients unresponsive to other therapies. The aims of this study are to identify gaps in process of care and to examine the impact of geographical remoteness on health service utilization and outcomes in adults with chronic ITP in Alberta. METHODS Adults who received rituximab, splenectomy, or thrombopoietin receptor agonists (TPO-RA) as second-line therapy for ITP during 2012-2019 in the province of Alberta, Canada were identified via the provincial special drug access database. Diagnostic workup including bone marrow biopsy results, abdominal imaging (ultrasound or CT scan), coagulation parameters, viral serologies for hepatitis, human immunodeficiency virus (HIV), serum protein electrophoresis (SPEP), and quantitative immunoglobulins were recorded and rates of completed tests were calculated. Utilization of IVIg, platelets, and packed red blood cells was assessed. Rates of hospitalization, mortality, and ITP-related deaths were calculated and compared according to geographic region. RESULTS Of the 204 patients identified for analysis 106 were female (52%). Most patients (123; 60%) lived within a major centre, whereas 21 (10%) lived over 250 km from a major centre. Review of diagnostic laboratory parameters revealed incomplete coagulation parameters in 117 patients (58%), and no coagulation parameters checked in 16%. Eighty-nine patients (44%) did not have quantitative immunoglobulins tested, and 57 (28%) did not have an SPEP performed. Fifty-three (26%) did not have any abdominal imaging performed to assess for splenomegaly or liver disease. Thirty-five (17%) did not have any viral serologies for hepatitis B, C, or HIV completed. Bone marrow aspirate and biopsy was performed in 110 patients (54%). Eighty-six (77%) of these biopsies yielded a normal result. Eight biopsies (7%) displayed a lymphoproliferative disorder or plasma cell disorder which was suspected or known prior to completing the test. There was significant geographic discrepancy in utilization of blood products and hospitalizations. During 527 patient years of follow up, 83 patients received a total of 343 doses of platelets. Eleven patients (13%) received platelet transfusions for inappropriate indications, and eight (9%) for unclear indications. One hundred twenty-seven patients received IVIg (mean 1290 g) with comparable usage across geographic regions. Compared to patients within 250 km from a major centre, those with geographic remoteness (>250 km from a major centre) utilized more platelets (mean 5.2 vs 1.2 doses; Figure 1) and packed red blood cells (mean 4.3 vs 1.2 units; Figure 2). Those with geographic remoteness also experienced a higher rate of ITP-related hospitalizations (mean 1.5 vs 1.1) and deaths (24% versus 9%). At a median follow-up of 3.42 years from ITP diagnosis, 27 patients (13%) were deceased. Fourteen of these deaths were ITP-related due to bleeding or infection (52%). There appears to be a gradient of rates of both all-cause and ITP-related deaths by distance from a major centre (Figures 3 and 4). DISCUSSION This study highlights gaps in quality of care in patients with chronic ITP in Alberta, Canada. A significant number of patients have an incomplete workup for ITP at the time of diagnosis with the most forgotten tests being coagulation studies, SPEP, quantitative immunoglobulins, viral serologies, and abdominal imaging. Additionally, we identified an unexpectedly high rate of bone marrow biopsies performed in our population. Most of these bone marrow examinations did not result in any change in management. Finally, this study identified that geographic remoteness is associated with increased health services utilization and ITP-related deaths. These data can be used to inform further quality improvement initiatives in chronic ITP and help address geographic inequities in healthcare outcomes. Figure 1 Figure 1. Disclosures Sun: Bayer: Consultancy; Novo Nordisk: Consultancy; Pfizer: Consultancy; Shire: Consultancy; Octapharma: Consultancy, Research Funding.


Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 4987-4987
Author(s):  
Monica Carpenedo ◽  
Marco Spinelli ◽  
Sara Pezzatti ◽  
Momcilo Jancovic ◽  
Rossella Renso ◽  
...  

Abstract Introduction. Children diagnosed with Immune thrombocytopenia (ITP) will develop a chronic disease (plt < 100 x 109/L lasting >12 months since the onset) in 20-30% of cases. The transition from ITP started in childhood to adulthood has been scarcely studied and no specific studies have been published Aims.To present the results of a single center retrospective survey on ITP pts diagnosed in childhood who were sent in an adult setting to continue the management Methods. Charts of ITP pts diagnosed in childhood (1-17 yrs) in our Pediatric Dept who developed a chronic disease, need at least one line of therapy and were sent to our adult ITP office from Jan 2013 to Feb 2018, were retrospectively reviewed. Demographic and clinical data were collected and outcome was assessed based on established guidelines Results. Our Pediatric Dept accounts for a mean of 37 newly ITP diagnosis/year in children aged 1-17 yrs, with 32.8% of pts developing a chronic disease. During the selected observation time, 60 pts was expected to become > 18 yrs old with a chronic ITP. Overall 28 pts (14 female) pts were sent to our Adult ITP office at pediatrician's discretion (46.6% of expected). Table 1 summarizes demographic and clinical characteristics of pts. Median age at ITP diagnosis was 9.5 yrs (12 moths to 17 yrs). Median age of pts coming to the adult ITP office was 21 yrs (18 to 37 yrs) and the reason they were sent for was the need to continue a pharmacological treatment in 8 cases (eltrombopag-Elt-), bleeding in 3 cases, pregnancy in 4 cases, plt count < 50 x 109/L in 13 cases. The median n of lines of treatment already received in childhood was 1 (1 to 4). 16 pts have received only steroid since diagnosis (on demand treatment for bleedings), 8 pts were treated with thrombopoietin receptor agonists (TPO-RA) and 1 also with rituximab. One patient, 8 yrs old, was splenectomized because of grade 3 multiple bleedings, with complete response (CR). He was sent to adult ITP office at 37 yrs when ITP relapsed, with grade 3 bleeding. Overall the median follow up from diagnosis, after the transition to adult ITP office is 18 yrs (4-39 yrs), the median n of lines at data cut-off was 2.5 (1-5) and the overall outcome is summarized in Fig 1. 11 patients were treated with TPO-RA (8 pts received Elt since childhood, 2 pts started Elt and 1 Rom in adulthood), ORR was 81.8% (CR=7). Since the transition 4 patients switched the TPO-RA because response to the first TPO-RA was suboptimal or minor side effect (headache) was reported or limited compliance was suspected. Splenectomy was offered to all patients treated with TPO-RA to avoid chronic pharmacological treatment, and to other selected patients with a low plt count and a history of bleeding. 8/11 patients accepted splenectomy. Median time since diagnosis to splenectomy was 8 yrs (1 to 18 yrs) and in all pts a stable CR (plt > 100 x 109/L) was achieved, with a median follow up after surgery of 36.5 months (10-48 months). Surgery was performed also in the previous splenectomized pt (29 yrs later) because an accessory spleen was detected, and a CR was achieved (follow up 40 months). 2 patients stopped TPO-RA on a personal decision, refused splenectomy or other treatments: their plt count is < 30 x 109/L without bleeding. 15 pts were on active follow up without therapy (median plt count 58 x 109/L) and without any bleeding. One patient is waiting for splenectomy, taking prednison. The 4 pregnant patients were treated with steroids and IVIG, had natural labour without adverse events and their babies had a normal plt count. After pregnancy one pt was treated with Elt for 1 year, then she refused treatment and splenectomy. All 4 women returned to a number of plts similar to pre-gestational count. In 1 pt a MYH9 related-disorder was confirm at 21 yrs. Overall a CR was achieved during TPO-RA treatment in 9/11 pts and 9/28 (32%) achieved a stable CR after splenectomy Conclusions. The transition from childhood to adulthood in chronic ITP pts leads clinicians to challenges related to growing age, especially in female pts approaching the fertility and pregnancy specific needs. However only a minority of children with ITP developed a chronic disease which required a prolonged treatment. TPO-RA seems to be effective and well tolerated but chronic administration has limited compliance. Splenectomy, even if performed in adulthood after many yrs since diagnosis, allows to achieve a stable CR sparing young adults from chronic pharmacological treatment. Disclosures Gambacorti-Passerini: Pfizer: Consultancy, Honoraria, Research Funding; BMS: Consultancy.


2020 ◽  
Vol 20 (3) ◽  
pp. 351-355 ◽  
Author(s):  
Paola Giordano ◽  
Maurizio Delvecchio ◽  
Giuseppe Lassandro ◽  
Federica Valente ◽  
Valentina Palladino ◽  
...  

Background: Immune thrombocytopenia (ITP) is an acquired immune mediated disorder characterized by isolated thrombocytopenia. Pediatric ITP patients can develop autoantibodies such as anti-thyroglobulin (TG) and anti-thyroperoxidase (TPO), even in the absence of clinical signs of autoimmune disease. Objective: The purpose of this article is to provide a review about: 1) the prevalence of positivity of anti-thyroid antibodies (TPO and TG) in pediatric patients with chronic ITP; 2) the role of autoimmune thyroiditis on the outcome of chronic ITP. Method: The authors individually completed a review of the literature for this article. Retrospective and prospective clinical studies with pediatric cohorts were considered. Results: From the analysis of data, we found 4 papers which included studies only on pediatric population, and which corresponded to selected criteria. Pediatric ITP patients have been shown to have a statistically significant prevalence of anti-thyroid antibodies over healthy controls (11.6-36% versus 1.2-1.3%). No correlation has been found between the platelet count and the prevalence of positive anti-thyroid antibodies at any time of the follow up. Conclusion: The results of our bibliographic research demonstrated that: a) pediatric patients with chronic ITP tend to have a statistically significant prevalence of anti-thyroid antibodies positivity respect to general pediatric population; b) there are no clear data about the role of autoimmune thyroiditis as prognostic factor for chronic course of ITP in pediatric age.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anastasia A. Ignatova ◽  
Elena V. Suntsova ◽  
Alexey V. Pshonkin ◽  
Alexey A. Martyanov ◽  
Evgeniya A. Ponomarenko ◽  
...  

AbstractImmune thrombocytopenia (ITP) is believed to be associated with platelet function defects. However, their mechanisms are poorly understood, in particular with regard to differences between ITP phases, patient age, and therapy. We investigated platelet function and bleeding in children with either persistent or chronic ITP, with or without romiplostim therapy. The study included 151 children with ITP, of whom 56 had disease duration less than 12 months (grouped together as acute/persistent) and 95 were chronic. Samples of 57 healthy children were used as controls, while 5 patients with leukemia, 5 with aplastic anemia, 4 with MYH9-associated thrombocytopenia, and 7 with Wiskott-Aldrich syndrome were used as non-ITP thrombocytopenia controls. Whole blood flow cytometry revealed that platelets in both acute/persistent and chronic ITP were increased in size compared with healthy donors. They were also pre-activated as assessed by PAC1, CD62p, cytosolic calcium, and procoagulant platelet levels. This pattern was not observed in other childhood thrombocytopenias. Pre-activation by CD62p was higher in the bleeding group in the chronic ITP cohort only. Romiplostim treatment decreased size and pre-activation of the patient platelets, but not calcium. Our data suggest that increased size, pre-activation, and cytosolic calcium are common for all ITP platelets, but their association with bleeding could depend on the disease phase.


Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 388-388
Author(s):  
Amanda Bell Grimes ◽  
Taylor Olmsted Kim ◽  
Jenny M. Despotovic ◽  
Susan Kirk

Background: Immune thrombocytopenia (ITP) is the most common acquired bleeding disorder in children. Although ~75% of these patients will go on to have spontaneous resolution of disease, up to 25% will develop chronic ITP, with significant and prolonged bleeding symptomatology and impaired quality of life. At this time, there is no definitive method to predict the development of chronic disease at the time of ITP diagnosis. Aims: We aim to identify clinical biomarkers predictive of the development of chronic ITP at the time of diagnosis among pediatric ITP patients. Methods: The clinical records of 280 pediatric ITP patients enrolled in a biological banking study at a large pediatric tertiary care referral center from July 1, 2015 to July 1, 2019 were reviewed in accordance with IRB-approved protocols. ITP diagnosis and chronicity of disease (vs. spontaneous resolution within 1 year of diagnosis) was confirmed by a pediatric hematologist, as defined by current international expert committee standards (Neunert et al, Blood, 2011;117(16):4190-207; Provan et al, Blood, 2010;115(2):168-186). Patients with non-classical ITP were excluded (1 child with drug-induced ITP in the setting of acyclovir therapy, and 1 neonate with passive ITP in the setting of maternal lupus); and patients who were lost to follow-up or had ongoing disease of &lt;1 year duration were subsequently excluded. Patient characteristics including age, gender, ethnicity, presence of concurrent autoimmune disease, and time to resolution were collected. Pertinent biomarkers including immunoglobulin levels (IgG, IgA, and IgM), anti-nuclear antibody (ANA), C-reactive protein (CRP), and immature platelet fraction (IPF) which were obtained at the time of diagnosis were documented, if if obtained prior to the administration of any ITP-directed therapy, and within 2 weeks of diagnosis. Chi-squared test or Fisher's exact test was utilized to compare nonparametric categorical data. Mann-Whitney U test was used to compare nonparametric continuous data. A multivariate backwards logistic regression model was conducted to determine independent associations with the development of chronic ITP. Statistical analyses were performed using SPSS Statistics 26 (IBM, Armonk, New York). A Bonferroni correction was applied to correct for multiple comparisons. A p value &lt; 0.05 was defined as statistically significant. Results: We identified 251 pediatric ITP patients with sufficient length of follow-up to define acute (&lt;1 year) vs. chronic (&gt;1 year) disease within our 4-year study period. This included 132 patients with acute ITP (53%) and 119 patients who went on to develop chronic ITP (47%). Mean age of diagnosis among those with acute ITP was 5.5 years, while mean age of diagnosis among those with chronic ITP was 7.7 years. Within the entire cohort, 126 (50%) were male, and 124 (49%) were of Hispanic ethnicity. Fifty-eight had ITP attributable to systemic autoimmune disease - 17% within the Acute ITP group, and 30% within the Chronic ITP group. Among all patients (n=251), 188 with evaluable biomarkers (immunoglobulin levels, ANA, CRP, or IPF) at the time of diagnosis were identified. These included 174 patients with Ig levels at diagnosis, 43 patients with ANA titers at diagnosis, 25 patients with CRP levels at diagnosis, and 78 patients with IPF at diagnosis. By univariate analysis, we found that abnormalities in immunoglobulin levels at diagnosis were significantly associated with the development of chronic ITP. Low IgG levels (p = 0.015) were more prevalent in chronic (10.3%) vs. acute ITP (1.9%). High IgG levels (p = 0.015) were more prevalent in chronic (6.7%) vs. acute ITP (1.9%). High IgM levels (p = 0.03) were more prevalent in chronic (26.5%) vs. acute ITP (13.3%). Of note, the presence of Evans syndrome (p = 0.0005) and other systemic autoimmune disease (p = 0.011) were also significantly associated with the development of chronic ITP. Subsequent multivariate analysis identified low IgG level at diagnosis to be independently predictive of chronic ITP (p = 0.043, with an odds ratio of 5.7). Conclusion: Although further study is needed within a larger international pediatric ITP cohort, the findings from this institutional study indicate that biomarkers obtained in routine clinical care at the time of ITP diagnosis, specifically immunoglobulin levels, can be utilized to help predict development of chronic disease among pediatric ITP patients. Disclosures Despotovic: Amgen: Research Funding; Dova: Honoraria; Novartis: Research Funding.


2020 ◽  
Vol 6 (8) ◽  
pp. 210-215
Author(s):  
B. Karypov

The development of digital technologies in all spheres of public life is an actual issue for states. Globalization processes spawn the need for broad integration, where digital technologies come to the fore on the development of an effective state with law-making that meets modern requirements. The use of digital technologies allows legal monitoring of the legislation system, ensuring the elimination of gaps, duplication, changes in the legislative acts. The article considers the problems of informatization and digitalization of law-making activity in the Kyrgyz Republic. The object of the study is public relations arising in the process of informatization and digitalization of the law-making activity of state authorities of the Kyrgyz Republic. The subject of the study is the theoretical and practical problems of the introduction and further development of information and digital technologies in the legislative process of the Jogorku Kenesh of the Kyrgyz Republic to increase the level of adopted regulatory legal acts and the effectiveness of lawmaking in general. While studying the problem, universal and specific scientific methods of cognition were used: analysis and synthesis, deduction and induction, historical and comparative. The results of the study allow us to conclude that the activity on the adoption, amendment and repeal of normative legal acts should correspond to a dynamically developing economy.


2021 ◽  
Author(s):  
Marcel Reiser ◽  
Klaus M. Josten ◽  
Hermann Dietzfelbinger ◽  
Anouchka Seesaghur ◽  
Markus Schill ◽  
...  

Introduction: The effectiveness and safety of romiplostim were evaluated by immune thrombocytopenia (ITP) phase (newly diagnosed/persistent/chronic) at romiplostim initiation. Methods: Post hoc analysis of a prospective, German, multicentre, observational study in adults with ITP who received ≥1 dose of romiplostim. Follow-up data were collected for ≤2 years. Outcomes included overall platelet response (≥1 platelet count ≥50 × 109/L at 2–24 weeks after romiplostim initiation) or durable platelet response (≥75% of measurements ≥50 x 109/L at 14–24 weeks), and adverse drug reactions (ADRs), evaluated by ITP phase. Results: Data from 96 patients were analysed (newly diagnosed, n=18; persistent, n=25; chronic, n=53). During the 2–24-week follow-up, overall platelet response was achieved in 100% (95% confidence interval [CI]: 81.5–100), 100% (86.3–100), and 96.2% (87.0–99.5) of patients with newly diagnosed, persistent, or chronic ITP, respectively; platelet responses were durable in 88.2% (63.6–98.5), 65.0% (40.8–84.6), and 69.4% (54.6–81.7) of patients. During the 2-year follow-up, ADRs occurred in 24.0–35.8% of patients across phases. Two patients with chronic ITP experienced bone marrow ADRs; no thrombotic ADRs occurred. Conclusion: Romiplostim was effective and well tolerated in patients with newly diagnosed, persistent, or chronic ITP in routine clinical practice.


2020 ◽  
Vol 15 (1) ◽  
pp. 81-86
Author(s):  
S.M. Mamatov ◽  
◽  
G.Sh. G.Sh.Maymerova ◽  
Ayzhamal Esengeldi kyzy ◽  
A.O. Musakeev ◽  
...  

Blood ◽  
2012 ◽  
Vol 120 (21) ◽  
pp. 1092-1092
Author(s):  
Markus Schmugge ◽  
Jeanine Winkler ◽  
Sabine Kroiss ◽  
Margaret L. Rand ◽  
Oliver Speer

Abstract Abstract 1092 Immune thrombocytopenia (ITP) is a common hematologic disorder in children that can lead to severe bleeding symptoms. In most children with ITP, platelet counts return to normal after weeks to months (acute ITP), however, in about 10–20% of patients, the low platelet counts persist for 12 months or longer (chronic ITP). No biological markers have been identified to predict the duration and/or severity of ITP. We have previously reported enhanced platelet apoptosis at the time of diagnosis of ITP in pediatric patients that was ameliorated after intravenous immunoglobulin (IVIg) (Winkler et al, Br J Haematol 2012;156:508–15). We have now investigated differences in the expression of markers of apoptosis in platelets from children with acute vs. chronic ITP. 23 pediatric patients with acute ITP were investigated and compared to 10 children with chronic ITP. In addition, from the initial group of acute ITP, 6 children developed chronic ITP and initial- and follow up results were compared. Markers of apoptosis, including activated caspase-3, caspase-8 and caspase-9, phosphatidylserine (PS) exposure, dissipation of the mitochondrial inner membrane potential (ΔYm), as well as microparticle formation, were analyzed by flow cytometry. At ITP diagnosis, the mean platelet count was 4×109/L (range: 1–14×109/L) and the proportions of platelets with activated caspase-3 (median, range) (20.4%, 1.4–64%, n=23), caspase-8 (16.7%, 1.0 – 42.7%, n=12) and caspase-9 (13.1%, 5 – 59.6%, n=12) were increased. While a higher mean platelet count was found in 10 children with chronic ITP (25×109/L, 4–60G/l), the proportions of platelets with activated caspase-3 (2.6%, 0.3–11.6%), caspase-8 (5.6%, 0.3–12.6%) and caspase-9 (4.3%, 0.3–15.6%) were significantly lower compared to children at diagnosis of acute ITP, but still higher compared to healthy controls (0.95%, 0 – 5.9%; 0.7%, 0.04 – 2.3% and 0.4%, 0.03 – 2.16%, respectively; n = 11) and children with thrombocytopenia due to chemotherapy (1.3%, 0.1 – 4.6%; 1.8%, 0.9 – 3.8%; and 1.8%, 0.6 – 2.9%, respectively; n = 11). Among the 6 children (26%) who developed chronic ITP from the initial cohort of 23 children, a mean platelet count of 29 (3–67×109/L) at >12 months after initial presentation was found. Except for one, none of the children with chronic ITP presented with bleeding symptoms; the median bleeding score was 2.5 (range: 1–3) at diagnosis and 1 (range: 0–2.5) at follow up during chronic ITP. In 5 of the children who developed chronic ITP, caspase activation was studied at diagnosis and at follow up >12 months after. In all of them, the proportions of platelets with activated caspase-3 (1.6%, 0.3–3.3%), caspase-8 (4.8%, 0.3–6.3%) and caspase-9 (4.1%, 0.3–7%) were found to be significantly lower at follow up compared to the time at diagnosis. In conclusion, although platelet apoptosis is enhanced at the time of diagnosis of pediatric ITP, this is not observed in platelets from patients with chronic ITP to the same degree. Further studies are needed to investigate other markers of apoptosis in platelets in the course of acute and chronic ITP. Disclosures: No relevant conflicts of interest to declare.


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