Risk Factors For Thrombocytopenia Research Articles

Prevalence and risk factors of thrombocytopenia during the third trimester of pregnancy

Background and objective: Thrombocytopenia, described as a platelet count of less than 150,000 mm3, is a common diagnosis during the period of pregnancy, existing in 7–12% of pregnancies. Mild thrombocytopenia occurs if platelet counts are less than 100,000 mm3, while moderate thrombocytopenia is between 50,000 and 100,000 mm3, and severe thrombocytopenia occurs if platelet counts are less than 50,000 mm3. It could be connected to physiologic changes or pathological diseases; some of them have an impact on pregnancy and may offer a serious risk to both the mother and the unborn child. This study sought to estimate the proportions of the underlying causes as well as the prevalence of thrombocytopenia among pregnant women visiting the antenatal care center in Erbil. Methods: A cross-sectional study was performed in a maternity teaching hospital in Erbil city, Kurdistan region, Iraq. A convenience sample of 600 pregnant women was used from 28 weeks to 40 weeks of gestation. Over a period of 1 year, starting in January 2021 and ending in December 2021. Results: The prevalence of thrombocytopenia among the 600 cases was 24.8%, but the majority (75.2%) had a normal platelet count; the degrees of thrombocytopenia were severe in 1.8% of the cases, mild in 8.3%, and moderate in 14.7% of the cases. Conclusion: A statistically significant association between preeclampsia and HELLP syndrome has been reported as a serious condition that leads to thrombocytopenia. High serum albumin levels in pregnant women related to hypertension had a major impact on the number of platelet counts and should be considered a severe disease.

Risk Factors for Thrombocytopenia Induced by Capecitabine Plus Oxaliplatin Therapy in Patients With Colorectal Cancer.

Capecitabine plus oxaliplatin (CapeOX) therapy is used as an adjuvant chemotherapy regimen for patients with colorectal cancer (CRC). Although oxaliplatin induces thrombocytopenia, the risk factors for thrombocytopenia in oxaliplatin-treated patients with CRC are not well established. We aimed to investigate the risk factors for thrombocytopenia in CapeOX-treated patients with CRC. In addition, we evaluated platelet counts and non-invasive liver fibrosis indices, specifically the aspartate aminotransferase-to-platelet ratio index (APRI) and the fibrosis-4 index (FIB-4), during CapeOX therapy in these patients. Between July 2017 and June 2020, we enrolled CapeOX-treated patients with high-risk stage II or stage III CRC at seven hospitals collaborating with the Division of Oncology, Aichi Prefectural Society of Hospital Pharmacists (Aichi prefecture, Japan). In this retrospective study, we investigated patients' backgrounds, laboratory data, concomitant medications, number of cycles of CapeOX and oxaliplatin, cumulative dose of oxaliplatin, and administration period. The cut-off values were calculated using receiver operating characteristic analysis of platelet counts and APRI and FIB-4 scores. Fifty-five patients without thrombocytopenia and 44 patients with thrombocytopenia were enrolled. During CapeOX therapy, the thrombocytopenia group showed a significant decrease in platelet count and a significant increase in APRI and FIB-4 scores compared to the non-thrombocytopenia group. Baseline albumin level ≤3.5 g/dl and platelet count ≤238×103/μl were independently associated with ≥grade 2 thrombocytopenia in CapeOX-treated patients. Baseline albumin level and platelet count may be useful for predicting thrombocytopenia in CapeOX-treated patients with high-risk stage II or stage III CRC.

Efficiency of Platelet Transfusion in Patients with Moderate-to-Severe Chronic Kidney Disease and Thrombocytopenia.

There have been relatively few studies revealing a decreased platelet count in chronic kidney disease (CKD). Although this hematological abnormality is not as well documented as renal anemia, platelet functions are altered in the uremic environment and there is an increased risk of bleeding. The aim of this study was to assess the effectiveness of the administration of platelet concentrate in CKD based on how patient prognosis was influenced by platelet transfusion therapy. The study monitored 104 patients with CKD and thrombocytopenia who received platelet transfusion during their hospitalization in the period from 2015 to 2021. The complete blood cell count, serum urea and creatinine, and inflammatory status were tested upon admission. The number of transfused platelet units were considered for each patient. A Kruskal-Wallis H test showed that for one transfused platelet unit, the distribution of the number of platelets (×103/µL) was the same across the categories of associated diagnoses, which was seen as possible risk factors for thrombocytopenia, including liver cirrhosis and urosepsis. With a single exception, all patients exceeded the critical threshold of 20 × 103/µL and 14 patients remained under 50 × 103/µL. Even though our patients exceeded the critical threshold of platelet numbers, in patients with multiple comorbidities, severe, uncontrolled hemorrhages could not be prevented in 4.83% of cases.

Risk factors for mortality after linezolid treatment of vancomycin-resistant Enterococcus bloodstream infection

ObjectivesWe analyzed the risk factors affecting linezolid treatment outcome in vancomycin-resistant Enterococcus (VRE) bloodstream infection (BSI). MethodsWe conducted a multicenter observational study of patients who received linezolid 600 mg every 12 hours for VRE BSI. The primary outcome was 28-day mortality. The estimated area under the concentration-time curve and trough concentration were calculated. Multivariable logistic regression was used for the outcome analysis. ResultsA total of 170 patients were included: 114 (67.1%) survived and 56 (32.9%) did not. A total of 26 (18.2%) isolates showed a linezolid minimum inhibitory concentration (MIC) of ≤1 mg/l, 113 (79.0%) of 2 mg/l, and 4 (2.8%) of 4 mg/l. The univariable analysis showed that the linezolid MIC and concentration-time curve/MIC were not associated with mortality (P = 0.95 and P = 0.42, respectively). After adjusting for underlying comorbidity and disease severity, the linezolid dose per body weight (LDBW), body height, and interaction between them were independent risks for mortality. Marginal analysis showed that increasing the LDBW was protective in patients with a body height <160 cm. A trough concentration of >12.2 mg/l was a risk factor for thrombocytopenia. ConclusionThe LDBW and body height were interactively associated with clinical outcomes of linezolid treatment for VRE BSI.

Risk Factors of Thrombocytopenia After Cardiac Surgery with Cardiopulmonary Bypass.

Postoperative thrombocytopenia is common in cardiac surgery with cardiopulmonary bypass, and its risk factors are unclear. This retrospective study enrolled 3,175 adult patients undergoing valve surgeries with cardiopulmonary bypass from January 1, 2017 to December 30, 2018 in our institute. Postoperative thrombocytopenia was defined as the first postoperative platelet count below the 10th quantile in all the enrolled patients. Outcomes between patients with and without postoperative thrombocytopenia were compared. The primary outcome was in-hospital mortality. Risk factors of postoperative thrombocytopenia were assessed by logistic regression analysis. The 10th quantile of all enrolled patients (75×109/L) was defined as the threshold for postoperative thrombocytopenia. In-hospital mortality was comparable between thrombocytopenia and non-thrombocytopenia groups (0.9% vs. 0.6%, P=0.434). Patients in the thrombocytopenia group had higher rate of postoperative blood transfusion (5.9% vs. 3.2%, P=0.014), more chest drainage volume (735 [550-1080] vs. 560 [430-730] ml, P<0.001), and higher incidence of acute kidney injury (12.3% vs. 4.2%, P<0.001). Age > 60 years (odds ratio [OR] 2.25, 95% confidence interval [CI] 1.345-3.765, P=0.002], preoperative thrombocytopenia (OR 18.671, 95% CI 13.649-25.542, P<0.001), and cardiopulmonary bypass time (OR 1.088, 95% CI 1.059-1.117, P<0.001) were positively independently associated with postoperative thrombocytopenia. Body surface area (BSA) (OR 0.247, 95% CI 0.114-0.538, P<0.001) and isolated mitral valve surgery (OR 0.475, 95% CI 0.294-0.77) were negatively independently associated with postoperative thrombocytopenia. Positive predictors for thrombocytopenia after valve surgery included age > 60 years, small BSA, preoperative thrombocytopenia, and cardiopulmonary bypass time. BSA and isolated mitral valve surgery were negative predictors.

Risk factors and prognosis of thrombocytopenia in people living with HIV/AIDS.

Thrombocytopenia is a common hematological manifestation in people living with human immunodeficiency virus (HIV) or acquired immune deficiency syndrome (AIDS; PLWHA). Data on the prognostic relationship and associated factors of thrombocytopenia and HIV infection in China are limited. We assessed the prevalence of thrombocytopenia, its association with prognosis, and analyzed the associated risk factors among demographic characteristics, comorbidities, hematological and bone marrow indicators. We collected patients identified as PLWHA in Zhongnan Hospital. The patients were divided into two groups: the thrombocytopenia group and the non-thrombocytopenia group. We analyzed and compared demographic characteristics, comorbidities, peripheral blood cells, lymphocyte subpopulations, infection indicators, bone marrow cytology, and bone marrow morphology of the two groups. Then we analyzed the risk factors for thrombocytopenia and the effect of platelet (PLT) values on the prognosis of patients. Demographic characteristics and laboratory results were obtained from medical records. In contrast to other studies, we included bone marrow cytology and morphology in this study. Data were analyzed with multivariate logistic regression analysis. The Kaplan-Meier method was used to plot 60-month survival curves for the severe, mild, and non-thrombocytopenia groups. The value p < 0.05 was taken as statistically significant. Among 618 identified PLWHA, 510 (82.5%) were male. Overall, thrombocytopenia was found in 37.7% [95% confidence interval (CI): 33.9-41.5%]. Multivariable logistic regression analysis showed that age ⩾40 years [adjusted odds ratio (AOR) 1.869, 95% CI: 1.052-3.320], combined with hepatitis B (AOR 2.004, 95% CI: 1.049-3.826), high procalcitonin (PCT) count (AOR 1.038, 95% CI: 1.000-1.078) were risk factors of thrombocytopenia in PLWHA. An increased percentage of thrombocytogenic megakaryocytes was a protective factor, with an AOR 0.949 (95% CI: 0.930-0.967). Kaplan-Meier survival curve analysis showed that the prognosis was worse in the severe than in the mild (p = 0.002) and non-thrombocytopenia groups (p = 0.008). We discovered a general high pervasiveness of thrombocytopenia in PLWHA in China. Age ⩾40 years, combined with hepatitis B virus infection, high PCT, and decreased percentage of thrombocytogenic megakaryocytes indicated a higher risk for developing thrombocytopenia. A PLT count ⩽50 × 109/liter led to a worse prognosis. Therefore, early diagnosis and treatment of thrombocytopenia in these patients are useful.

Risk factors of thrombocytopenia in term infants in Prof. Dr. I.G.N.G. Hospital Denpasar Bali

Thrombocytopenia is a condition in which platelet count below 150 x 109/L. Neonatal thrombocytopenia (NT) accounts up to 35% of all patients admitted to neonatal intensive care unit (NICU). The underlying cause of NT can often be predicted by the onset time of thrombocytopenia and course of disease. The purpose of this study was to determine the risk factors of thrombocytopenia in term infants undergoing treatment at Prof. Dr. I.G.N.G. Hospital. Method: An observational analytical study using case-control design was conducted in 50 term infants from March 2021 to October 2021 in Prof. Dr. I.G.N.G. Hospital Denpasar Bali. Result: Total 25 infants with thrombocytopenia in case group and 25 infants without thrombocytopenia in control group. Most of the infants were dominated by female gender (54%), mean gestational age was 38 (± 1) weeks, birth weight 2,940 (± 445) gram, cesarean section (56%). In addition, 48% of patients were vigorous babies. Early-onset neonatal sepsis (EOS) was 76% and late-onset neonatal sepsis (LOS) was 14%, most infants had neonatal pneumonia 58% and necrotizing enterocolitis (NEC) 48%. Mothers with preeclampsia were 26%. Multivariate analysis showed EOS was risk factor for NT (OR 4.69; 95% CI 0.9 – 22.0) and NEC (OR 4.17; 95% CI 1.2 – 14.4). Conclusion: Early onset neonatal sepsis (EOS) and necrotizing enterocolitis (NEC) are risk factors for thrombocytopenia in term infants.

Linezolid-related adverse effects in the treatment of rifampicin resistant tuberculosis: a retrospective study

Linezolid (LZD) is an effective drug in treating multidrug-resistant tuberculosis and extensively drug-resistant tuberculosis. This study aimed to evaluate the safety of LZD in the treatment of patients with rifampicin resistant tuberculosis. This was a multicenter retrospective study. A total of 184 patients of the rifampicin resistant tuberculosis patients treated with LZD from Jan 2018 to Apr 2020 in three hospitals were involved, and their clinical symptoms were recorded and analyzed. Meanwhile, the types and incidence of adverse effects associated with LZD were evaluated. It showed that peripheral neuritis (51, 27.7%) and hemochromatosis (42, 22.8%) were the most common adverse effects observed among these patients. The median time of symptoms after LZD treatment was 45.5 and 120.0 days, respectively. Furthermore, female patients had a significantly higher risk for leukopenia (P = 0.002) and hemochromatosis (P = 0.033) when compared with male patients. History of underlying disease was the risk factor for thrombocytopenia (P = 0.022). Patients with long duration of medication (RR = 1.004, 95%CI: 1.002–1.006, P < 0.001) and daily dosage ≥600mg (RR = 3.059, 95%CI: 1.238–7.558, P = 0.015) were at higher risk of hemochromatosis. Age was the risk factor for rash (P = 0.008) and nausea and vomiting (P = 0.018). In addition, LZD administration time was the risk factor for optic neuritis (P < 0.001) and peripheral neuritis (P < 0.001). LZD can cause adverse symptoms in patients with rifampicin resistant tuberculosis. Gender, history of underlying disease, LZD use time, LZD dosage, and age are the risk factors in the LZD treatment of these patients. During medication, bone marrow suppression and neuropathy should be closely monitored. This study could potentially provide useful information for the clinical practice.

Correlation between Serum miR-34a Level and Thrombocytopenia after Chemotherapy in Patients with Diffuse Large B-Cell Lymphoma

To analyze the relationship between serum miR-34a level and thrombocytopenia after chemotherapy in patients with diffuse large B-cell lymphoma (DLBCL). A total of 69 eligible DLBCL patients who received chemotherapy in our hospital from January 2018 to January 2020 were prospectively included as the research subjects, all patients received R-CHOP 21 regimen (rituximab + cyclophosphamide + adriamycin + vincristine + prednisone) for chemotherapy, 3 weeks was 1 cycle, and 2 cycles of chemotherapy were used. The patients were divided into a reduction group and a non reduction group according to whether there was thrombocytopenia after chemotherapy, the general data and laboratory indexes of the two groups were investigated and compared, the relationship between serum miR-34a before chemotherapy and thrombocytopenia after chemotherapy in patients was analyzed. Among the 69 DLBCL patients, 36 patients developed thrombocytopenia after 2 cycles of R-CHOP 21 regimen for chemotherapy, the incidence was 52.17%; the level of serum IL-11 and the relative expression of miR-34a mRNA in the reduction group were significantly lower than the non reduction group (P<0.05), compared other data between groups, there was no statistical significant difference (P>0.05); after Logistic regression analysis, the results showed that the level of serum IL-11 and the relative expression of miR-34a mRNA were related to thrombocytopenia after chemotherapy in DLBCL patients, low expression of each index may be a risk factor of thrombocytopenia after chemotherapy in DLBCL patients (OR>1, P<0.05); ROC curve was drawn, and the results showed that the AUC of serum IL-11 level and miR-34a mRNA relative expression before chemotherapy alone and in combination predicted the risk of thrombocytopenia after chemotherapy in DLBCL patients were all >0.80, and the predictive value was ideal, when the cut-off value of serum IL-11 level before chemotherapy was 42.094 pg/ml, and the cut-off value of miR-34a mRNA relative expression was 3.894, the combined prediction value was the best. The relative expression of miR-34a mRNA is associated with thrombocytopenia after chemotherapy in DLBCL patients, which may be a risk factor for thrombocytopenia in patients after chemotherapy, has certain value in predicting the risk of thrombocytopenia of patients after chemotherapy.

Prevalence and Risk Factors of Thrombocytopenia in a Medical Intensive Care Unit in Egypt

Prevalence and Risk Factors of Thrombocytopenia in a Medical Intensive Care Unit in Egypt

Characterization of platelet concentrations and evaluation of risk factors for thrombocytopenia following traumatic injury

Introduction Thrombocytopenia is common in critically ill trauma patients and can lead to potentially broad differentials, including major bleeding, hemodilution, extracorporeal circuit losses, heparin-induced thrombocytopenia, and more. Understanding the normal time course of platelet decline and recovery may delineate thrombocytopenia(HIT) secondary to traumatic injury versus other inciting factors. Methods This retrospective study included trauma patients admitted over a 1-year period. The primary aim was characterizing the effect of trauma on platelet concentration and thrombocytopenia incidence in the first 30 days following injury. Thrombocytopenia was defined as platelet concentration &lt;150 × 109/L. A secondary aim was evaluating significant factors contributing to thrombocytopenia. Results A total of 225 patients were included. Thrombocytopenia occurred in 67.3% of patients, and a platelet decline of 50% or greater occurred in 44%. Decrease in platelet concentration was significant from day 1 to day 4 (mean ± SD, 232 ± 86 vs 142 ± 76 × 109/L; p = .001). Platelets recovered to baseline on day 8 and peaked on day 16. Packed red blood cell or platelet transfusion, continuous renal replacement therapy, and acute liver injury independently predicted a ≥50% platelet decrease. HIT was not diagnosed in any patients. Conclusion Platelet nadir likely occurs approximately 4 days after injury and recovers relatively quickly thereafter. More studies are needed to evaluate the magnitude of effect on thrombocytopenia by factors beyond trauma.

Thrombocytopenia in Critical Care Unit: Risk Factors, Etiologies, and Management

Introduction: Thrombocytopenia is a platelet count below 150,000/mm3. It is a frequent abnormality in critically ill patients. Methods: We conducted a retrospective study which included 603 patients admitted to the medical intensive care unit in the Ibn Rochd university hospital of Casablanca over a two years period, from January 1, 2018 to December 31, 2019. The aim of the study is to point out the incidence, risk factors, etiologies, therapeutic modalities, as well as the morbidity and mortality related to thrombocytopenia in critical care. Results: During the study period, and out of these 603 patients, 168 patients had thrombocytopenia, that is an incidence of 27.8%; 38 patients among them were admitted with an already ongoing thrombocytopenia. Sepsis, Acute respiratory distress syndrome, renal failure, hemodialysis, and liver dysfunction were risk factors of thrombocytopenia and predictors of mortality. Thrombocytopenia was a factor of increased mortality, the percentage of death was higher in the thrombocytopenic group compared with the non-thrombocytopenic group with a rate of 42.26%. However, it was not an independent factor of mortality. Conclusion: Sepsis is the major factor incriminated in the occurrence of thrombocytopenia in critically ill patients. Therapeutic management including platelet transfusion should depend on the etiology of thrombocytopenia along with the associated hemorrhagic risk.

Risk factors for thrombocytopenia and analysis of time to platelet transfusion after azacitidine treatment.

The use of azacitidine (AZA) has been known to lead to a high incidence of hematotoxic adverse events. The aims of this study were to identify the risk factors for thrombocytopenia after the administration of AZA and to analyze time to the initial platelet transfusion. Sixty-two patients with myelodysplastic syndrome (MDS), who were treated with AZA in Gifu Municipal Hospital between March 2012 and June 2020, were included in this study. The risk factors for thrombocytopenia were identified using univariate analysis of patient characteristics, disease type, and laboratory values immediately before the start of treatment. Variables with p<0.2 identified in the univariate analysis were used as independent variables in the multivariate analysis. This analysis identified "creatinine clearance (CCr) <60 mL/min" as a significant factor (odds ratio, 4.790; 95% confidence interval [CI], 1.380-16.70; p=0.014). Subsequently, time in days to the initial platelet transfusion after the initial administration of AZA was analyzed using the log-rank test. The overall median time in days to platelet transfusion was 370 days. The log-rank test was used to determine the influence of patient characteristics, disease type, and laboratory values immediately before the start of treatment. The subsequent Cox proportional hazard regression analysis using variables with p<0.2 as independent variables identified "hemoglobin (Hb) <8.0 g/dL" as a significant factor (hazard ratio, 2.143; 95% CI, 1.001-4.573; p=0.048). The results of this study led to the following clinical implications: first, patients with CCr of <60 mL/min at the start of treatment should be treated with caution due to the risk of thrombocytopenia. Second, patients with Hb of <8.0 g/dL at the start of treatment may require platelet transfusion in the early stage of treatment.

Incidence and Risk Factors of Thrombocytopenia in Neonates Admitted with Surgical Disorders to Neonatal Intensive Care Unit of Tikur Anbessa Specialized Hospital: A One-Year Observational Prospective Cohort Study from a Low-Income Country.

BackgroundThrombocytopenia is one of the most common hematologic disorders affecting neonates admitted to the neonatal intensive care unit. The aim of this study was to determine the incidence and associated risk factors of neonatal thrombocytopenia in neonates admitted with surgical disorders.MethodsAn observational prospective cohort study was conducted and all neonates admitted to neonatal intensive care unit of Tikur Anbessa Specialized Hospital with surgical disorders were included. Data were collected using a checklist and analyzed by SPSS version 23. Chi square test and independent sample t- test were used to assess the association among different variables.ResultsA total of 210 neonates were included in the study, out of which 56.2% were males. The incidence of thrombocytopenia was 55.8%. Among neonates with thrombocytopenia, 90.9% had late onset thrombocytopenia and half were in the severe range (<50,000/µL). The presence of sepsis (P = 0.000) and atresia (P = 0.000) were found to be significantly associated with the development of thrombocytopenia. The mean non feeding hours were found to be significantly longer for patients with thrombocytopenia (t [199], 5.81, P = 0.000).ConclusionThe incidence of thrombocytopenia is high in our institution. Prevention methods towards neonatal sepsis should be given due emphasis.

Clinical Use and Adverse Drug Reactions of Linezolid: A Retrospective Study in Four Belgian Hospital Centers.

In Belgium, linezolid is indicated for pneumonia and skin and soft tissue infections, but is more broadly used, due to its oral bioavailability and activity against multiresistant organisms. This could increase the risk of adverse drug reactions (ADR), notably hematological disorders (anemia, thrombocytopenia), neuropathy, or lactic acidosis. We analyzed linezolid clinical use in relationship with occurrence of ADR in Belgian hospitals and highlighted risk factors associated with the development of thrombocytopenia. A retrospective analysis of electronic medical records and laboratory tests of adult patients treated with linezolid in four Belgian hospitals in 2016 allowed the collection of ADR for 248 linezolid treatments. Only 19.7% of indications were in-label. ADR included 43 thrombocytopenia, 17 anemia, 4 neuropathies, and 4 increases in lactatemia. In a multi-variate analysis, risk factors of thrombocytopenia were a treatment duration > 10 days, a glomerular filtration rate < 60 mL/min, and a Charlson index ≥ 4. Off-label use of linezolid is frequent in Belgium, and ADR more frequent than reported in the summary of product characteristics, but not statistically associated with any indication. This high prevalence of ADR could be related to a high proportion of patients presenting risk factors in our population, highlighting the importance of detecting them prospectively.

Incidence and Risk Factors of Thrombocytopenia in Neonates Admitted With Surgical Disorders to Neonatal Intensive Care Unit of Tikur Anbessa Specialized Hospital; A One-Year Observational Prospective Cohort Study From a Low-Income Country

Background: Thrombocytopenia is one of the most common hematologic disorders affecting neonates who are admitted to the neonatal intensive care unit with a reported incidence of 18-35%. Several maternal, neonatal and perinatal factors contribute to the development of thrombocytopenia. This study is aimed to determine the incidence and associated risk factors of neonatal thrombocytopenia. Methods: An observational prospective cohort study was conducted and all neonates admitted to the neonatal intensive care unit of Tikur Anbessa Specialized Hospital with surgical disorders in the study period were included. Data was collected using a checklist and analysed by SPSS version 23. Chi square test and independent sample T- test were used to asses the association among different variables. Findings: A total of 210 neonates were included in the study out of which 56.2% were males. The incidence of thrombocytopenia in the study period was 55.8%. Among neonates with thrombocytopenia, 90.9% had a late onset thrombocytopenia and half of them were in the severe range (<50,000/µl). The presence of sepsis(P=0.000) and atresia (P=0.000) were found to be significantly associated with the development of thrombocytopenia. The mean non feeding hours were found to be significantly longer for patients with thrombocytopenia (t (199), 5.81, P= 0.000). Interpretation: The incidence of thrombocytopenia in neonates admitted with surgical disorders was high in our institution. Preventive methods towards neonatal sepsis including antenatal and postnatal measures should be given due emphasis. Initiation of oral feedings in neonates as early as feasible is recommended. Funding Statement: Addis Ababa University has granted the fund for this study. Declaration of Interests: None. Ethics Approval Statement: Written informed consent was taken from parents of enrolled neonates and each neonate’s clinical data was kept in confidential manner using a coding system. Ethical clearance for this study was obtained from ethical board of the medical college.

Low arterial oxygen partial pressure induces pulmonary thrombocytopenia in patients and a mouse model

BackgroundRecent basic studies demonstrate that the lung is a primary organ of platelet biogenesis. However, whether the pathophysiological state of the lung affect the platelets is little known. We aim to investigate the incidence of thrombocytopenia in patients with pulmonary infection (PIN) and risk factors associated with pulmonary thrombocytopenia.MethodsIn total, 11,941 patients with pulmonary infection (PIN) were enrolled, and patients with other three infectious diseases were collected as controls. The incidence of thrombocytopenia was compared, and the risk factors associated with thrombocytopenia in PIN patients were investigated by multivariate analysis. To explore the mechanism of thrombocytopenia, hypoxic model was constructed. Blood platelet counts from the angular vein (PLTs), left ventricle (PLTpost) and right ventricle (PLTpre) were determined. Megakaryocytes identified by anti-CD41 antibody were detected through flow cytometry and immunofluorescence.ResultsThe incidence of thrombocytopenia in PIN was higher than that in other three infectious diseases (9.8% vs. 6.4% ~ 5.0%, P < 0.001). Low arterial oxygen partial pressure (PaO2) was an important risk factor for thrombocytopenia (OR = 0.88; P < 0.001). In a hypoxic mouse model, PLTs decreased (518.38 ± 127.92 vs 840.75 ± 77.30, P < 0.05), which showed that low PaO2 induced thrombocytopenia. The difference between the PLTpost and PLTpre (∆PLTpost-pre), representing the production of platelets in the lungs, was significantly attenuated in hypoxic mice when compared with normoxic mice (F = 25.47, P < 0.05). Additionally, proportions of CD41-positive megakaryocytes in the lungs, marrow, spleen all decreased in hypoxic mice.ConclusionThere is a high incidence for thrombocytopenia in PIN patients. Low PaO2-induced thrombocytopenia is associated with impaired generation of platelet in the lungs.

Роль полиморфизма генов системы гемостаза в патогенезе COVID-19

Objective. To analyze polymorphisms of genes involved in hemostasis among patients with coronavirus disease 2019 (COVID 19) to improve the diagnosis of coagulopathy and prognosis of COVID-19 severity. Patients and methods. We have examined 52 patients with COVID-19 aged 33 to 84 years. Of them, 30 individuals (Group 1) were hospitalized with extremely severe (1A) and severe (1B) disease, whereas 22 patients with mild and asymptomatic disease were treated in outpatient departments (group 2). We assessed allelic variants of genes associated with hemostasis dysfunction (including FGB, FII, FV, FVII, F13A1, PAI-I, Gp1a, and Gp3a) using genomic DNA isolated from peripheral blood leukocytes. Polymorphisms were detected by polymerase chain reaction. Data analysis was performed using the Statistica, version 12 (StatSoft, USA). To compare independent categorical variables, we constructed contingency tables, performed Pearson chisquare test with Yates correction, Fisher exact test, and calculated relative risk (RR) [CI]. Results. COVID-induced coagulopathy (CAC) was diagnosed in 16.7% of patients; risk of CAC was identified in 30% of patients; sepsis-induced coagulopathy (SIC) was observed in 3.3% of patients; none of study participants had disseminated intravascular coagulation (DIC). Hemostasis impairments were more common in group 1A (RR = 2.28 [1.16–4.48]). Only patients from Group 1 had mutations in the gene encoding prothrombin (FII) –6.9% (RR = 1.78 [1.40–2.28]); protective polymorphisms in the FVII gene were more common in patients from Group 2 (χ2 = 3.28, р = 0.046); the rs 5985 polymorphism in the F13A1 gene was more common in patients from Group 1 (RR = 1.73 [1.06–2.82]). Patients with extremely severe COVID- 19 were more likely to have polymorphisms in the Gp1a gene (ITGA2) (RR =1.64 [1.05–2.56]) and F13A1 gene (χ2 = 2.67, р = 0.05), as well as homozygous mutation in the FII gene; they had no polymorphisms in the FVII gene (10976G→A). Thrombophilia, detected in 3 patients from Group 1, was a risk factor for thrombocytopenia (RR = 13.5 [3.56–51.23]), САС (RR = 9.0 [3.1–26.16]), and death (n = 4). The 4G allele (4G/4G, 4G/5G variants) in the PAI-I gene (rs 1799889), causing impaired fibrinolysis, was more frequently registered in patients with mild COVID-19 (91%) than in those with extremely severe COVID-19 (70%). It is possible that patients with extremely severe disease develop transient hyperfibrinolysis, which results in the transformation of local pulmonary COVID-19 into sepsis. Therefore, the 4G/4G and 4G/5G polymorphisms may have a protective role. Key words: hemostasis, COVID-19, polymorphism, genetics, COVID-induced coagulopathy

Incompatibility between recipient CD47 and donor SIRPα is not a key risk factor for thrombocytopenia or anemia following rat liver xenotransplantation in mice

Liver xenotransplantation (LXT) is greatly impeded by severe thrombocytopenia, anemia, and coagulopathy. Hepatic phagocytic cells are thought to play an important role in LXT-induced thrombocytopenia and anemia. In this study, we investigated whether the lack of recipient CD47-donor SIRPα interaction, which is known to induce xenograft rejection by macrophages, exacerbates platelet and RBC depletion following LXT. We first addressed this question in the absence of anti-donor immune responses using a syngeneic mouse liver transplantation (LT) model. Neither wild-type (WT) nor CD47KO B6 mice developed thrombocytopenia following LT from WT B6 donors. Although a moderate decline in RBCs was detected following LT, there was no significant difference in RBC counts between WT and CD47KO recipients. Because mouse CD47 is cross-reactive with rat SIRPα, we then compared thrombocytopenia and anemia between WT and CD47KO mice following rat LXT. Unlike syngeneic mouse LT, significant thrombocytopenia and anemia were detected following rat LXT. However, the severities of both platelet and RBC depletions were comparable between WT and CD47KO recipients. Furthermore, WT and CD47KO recipients showed a similar extent of early platelet activation. Our results indicate that CD47-SIRPα signaling does not significantly affect the loss of platelets or RBCs following LXT, suggesting that the limited cross-reactivity between recipient CD47 and donor SIRPα is not a significant risk factor for LXT-induced thrombocytopenia and anemia.

Impact of Immunosuppressive Strategies on Post–Kidney Transplantation Thrombocytopenia

BackgroundThrombocytopenia after kidney transplantation is a common complication, partly induced by immunosuppressive therapies. Peritransplant thrombocytopenia may cause serious hemorrhages. We assessed the incidence of early posttransplantation thrombocytopenia (defined as a platelet count of <150,000 mm3 or <150 G/L) in de novo kidney transplant recipients (KTRs) across 4 immunosuppressive regimens. MethodsThis was a single-center observational study that included all consecutive KTRs who received either Thymoglobulin (THY) or Grafalon (GRA) and maintenance therapy of either mycophenolate-mofetil (MMF) or everolimus (EVR), associated with tacrolimus/corticosteroids. ResultsBetween July 27, 2016, and September 7, 2018, 237 KTRs were included; 64.6% experienced thrombocytopenia within the first week. Thrombocytopenia was significantly more frequent (P = .004) among GRA-treated patients (73.4%) compared to THY-treated patients (61.3%). These patients also had lower nadir platelet count (120 ± 52 vs 142 ± 48 G/L; P = .002) and lower platelet count at discharge (227 ± 94 vs 243 ± 92 G/L; P = .25). More of the GRA-EVR group had thrombocytopenia (81.0% vs 61.4% in THY-MMF, 60.9% in THY-EVR, and 69.8% in GRA-MMF; P = .081) and a worse nadir platelet count (109 ± 41 in GRA-EVR vs 141 ± 47G/L in THY-MMF, 145 ± 52 G/L in THY-EVR, and 125 ± 56 G/L in GRA-MMF; P = .011) but GRA was the only risk factor for thrombocytopenia in multivariate analyses (P = .002). Rates of hemorrhage, red blood cell transfusions, reoperations needed within the first week, delayed graft function, acute rejection, graft loss, and death did not differ between the groups after a mean follow-up of 25 ± 8 months. ConclusionsGRA associated with EVR led to more frequent and severe thrombocytopenia, although we found no significant clinical consequences.