Hypocoagulability in severe yellow fever infection is associated with bleeding: results from a cohort study.

Background: Severe yellow fever infection (YFI) may be complicated by a hemorrhagic diathesis. However, the hemostasis profile of YFI has rarely been reported.

Objectives: The aim of this study was to characterize the hemostatic features of YFI by using a rotational thromboelastometry (ROTEM).

Heavy menstrual bleeding in women with inherited bleeding disorders in use of LNG-IUS: A systematic review and single-arm meta-analysis.

Objectives: Inherited bleeding disorders may cause heavy menstrual bleeding in women, impacting quality of life and impairing daily and social activities. The levonorgestrel-releasing intrauterine system is a potential treatment for these women, which might reduce menstrual blood loss.

Study Design: We performed a systematic review and single-arm meta-analysis to examine the levonorgestrel-releasing intrauterine system in women with inherited bleeding disorders and heavy menstrual bleeding.

Deficiency of coagulation factors is associated with the bleeding diathesis of severe yellow fever.

Yellow fever (YF) is an acute tropical infectious disease caused by an arbovirus and can manifest as a classic hemorrhagic fever. The mechanism of the bleeding diathesis in YF is not well understood. We assessed clinical and laboratory data (including a panel of coagulation tests) from 46 patients with moderate (M) and severe (S) YF admitted to a local hospital between January 2018 and April 2018.

Direct oral anticoagulants in oral surgery: a prospective cohort.

Background: Quantitative assessment of bleeding in dental extractions is rarely reported in the literature. The assessment of bleeding might provide additional evidence to predict and minimize postoperative outcomes. The aim of this study was to evaluate the pattern of bleeding in individuals taking direct oral anticoagulants (DOACs) submitted to dental extractions.

Risk of recurrent venous thromboembolism related to prior risk situations: re-evaluation of a cohort study with a longer follow-up.

: Venous thromboembolism (VTE) is a chronic disease. Strategies to assess groups at a high risk of recurrence are needed. We reported that patients without prior risk situation for VTE had an incidence rate ratio (IRR) three times higher when compared with those with this history.

Inhibitory effects of dabigatran etexilate, a direct thrombin inhibitor, on osteoclasts and osteoblasts.

Introduction: Anticoagulants are widely used in orthopedic surgery to decrease the risk of deep vein thrombosis. While significant bone impairment is induced by long-term heparin therapy, little is known about the effects of direct oral anticoagulants (DOACs). Herein, we investigated the effects of dabigatran etexilate (Pradaxa®), a DOAC inhibitor of thrombin, on bone cells using in vitro and ex vivo cell culture models.

Non-genetic factors and polymorphisms in genes CYP2C9 and VKORC1: predictive algorithms for TTR in Brazilian patients on warfarin.

Purpose: This study was designed to evaluate the association of non-genetic factors and polymorphisms CYP2C9*2 (rs1799853), CYP2C9*3 (rs1075910), and VKORC1-G1639A (rs9923231) with time in therapeutic range (TTR), and to build a regression model to predict the quality of oral anticoagulation control in a sample of Brazilian patients.

Methods: This is a retrospective cohort study developed at an anticoagulation clinic of a university hospital. Overall, 312 patients were included.

Protocol of a clinical trial study involving educational intervention in patients treated with warfarin.

Background: Atrial fibrillation (AF) is the most common sustained arrhythmia worldwide. Oral anticoagulation is an effective strategy for primary and secondary prevention of stroke in patients with AF. Warfarin is an oral anticoagulant widely prescribed and, despite its benefits, the achievement of the goals of drug therapy depends on patient involvement, among other factors.

Risk factors associated with recurrent venous thromboembolism after a first cerebral venous thrombosis event: A cohort study.

Background: Cerebral venous thrombosis (CVT), although rare, is potentially fatal. Few studies have investigated risk factors associated with recurrent venous thromboembolism (VTE) after a first CVT event of which most are from Caucasian populations. The aim of this study was to evaluate risk factors associated with recurrent VTE after a first CVT event in a South American-population.

Bleeding assessment in oral surgery: A cohort study comparing individuals on anticoagulant therapy and a non-anticoagulated group.

Some prospective studies have been designed specifically to investigate perioperative bleeding in dental surgery. The quantitative assessment of intraoperative blood loss can be useful for indicating the real risk of bleeding complications, especially in medically compromised individuals. The aim of this study was to evaluate the pattern of bleeding in individuals under vitamin K antagonist (VKA) therapy and non-anticoagulated individuals submitted to dental extractions.

Predictive ability of scores for bleeding risk in heart disease outpatients on warfarin in Brazil.

Introduction: Bleeding is a common complication in patients taking warfarin. We sought to compare the performance of nine prediction models for bleeding risk in warfarin-treated Brazilian outpatients.

Methods: The dataset was derived from a clinical trial conducted to evaluate the efficacy of an anticoagulation clinic at a public hospital in Brazil.

Infection of hematopoietic stem cells by Leishmania infantum increases erythropoiesis and alters the phenotypic and functional profiles of progeny.

Immunosuppression is a well-established risk factor for Visceral Leishmaniasis. Post-immunosuppression leishmaniasis is characterized by an increase of parasite burden, hematopoietic disorders and unusual clinical manifestations. Although there are many reports on bone marrow findings in VL, less is known about the relationship between parasite dynamics in this organ and the function of either hematopoietic stem cells and progenitor cells themselves.

Oral surgery in patients under antithrombotic therapy: perioperative bleeding as a significant risk factor for postoperative hemorrhage.

: To investigate perioperative and postoperative bleeding, complications in patients under therapy with anticoagulant or antiplatelet drugs submitted to oral surgery. To evaluate the risk of bleeding and safety for dental surgery, a retrospective chart review was performed. Medical and dental records of patients taking oral antithrombotic drugs undergoing dental surgery between 2010 and 2015 were reviewed.

Cross-cultural Adaptation of the Oral Anticoagulation Knowledge Test to the Brazilian Portuguese.

Patients' knowledge about oral anticoagulant therapy may favor the achievement of therapeutic results and the prevention of adverse pharmacotherapy-related events. Brazil lacks validated instruments for assessing the patient's knowledge about treatment with warfarin. This study aimed to perform the cross-cultural adaptation of the Oral Anticoagulation Knowledge (OAK) Test instrument from English into Portuguese.

Clotting factor XIII and desmopressin improve hemostasis in uncontrolled bleeding.

Purpose: To investigate hemostatic effects of supplementary factor XIII and desmopressin (DDAVP) in resuscitation of uncontrolled bleeding.

Methods: Fifty-four rabbits were randomized in nine groups: G1: Sham; G2: FXIII and normotensive resuscitation (NBP); G3: FXIII and permissive hypotension (PH) (MAP 60% baseline); G4: FXIII/DDAVP/NBP; G5: FXIII/DDAVP/PH; G6: NBP only; G7: FXIII no hemorrhage; G8: FXIII/DDAVP no hemorrhage; G9: PH only. Thromboelastometry and intra-abdominal blood loss were assessed.

Effects of Tityus serrulatus scorpion venom on thromboelastogram in rats.

Thromboelastometry was used to evaluate blood coagulation in anesthetized rats after intravenous administration of Tityus serrulatus scorpion venom (Tx). Tracheostomy followed by catheterization of the left jugular vein and right carotid artery were performed for Tx or Ringer's lactate solution injection and blood sample harvesting, respectively. Blood samples were obtained at the beginning of the experiments (baseline) and at two, five, 15, 30, and 60 min after intoxication.

Polymorphisms of CYP2C9, VKORC1, MDR1, APOE and UGT1A1 genes and the therapeutic warfarin dose in Brazilian patients with thrombosis: a prospective cohort study.

Background: There are several pharmacogenetic algorithms to determine the warfarin doses required in patients treated for thromboembolism, but they only explain 60% of dose variation, suggesting that other genes may influence the dose required.

Objectives: This study aimed to evaluate the impact of clinical factors and CYP2C9*2, CYP2C9*3, VKORC1-1639G>A, MDR1 3435C>T, APOE* ε4, and UGT1A1(TA)n polymorphisms on the warfarin dose required, especially in those individuals requiring a high warfarin dose.

Methods: We studied 116 Brazilian patients who received warfarin therapy for thromboembolism.

ABO blood group polymorphisms and risk for ischemic stroke and peripheral arterial disease.

Recent studies have demonstrated association between ABO blood system and thrombosis, indicating that individuals belonging to non-O blood groups (A, B or AB) present an increased risk of venous thrombosis, heart disease, and ischemic stroke (IS) as compared to O blood group carriers. In this study, we investigated the frequency of ABO blood group polymorphisms and its association with IS and peripheral arterial disease. Significant differences were observed for O1 (OR 0.

Protein S levels and the risk of venous thrombosis: results from the MEGA case-control study.

In thrombophilic families, protein S deficiency is clearly associated with venous thrombosis. We aimed to determine whether the same holds true in a population-based case-control study (n = 5317). Subjects were regarded protein S deficient when protein S levels were < 2.

Rifampicin-warfarin interaction leading to macroscopic hematuria: a case report and review of the literature.

Background: Rifampicin remains one of the first-line drugs used in tuberculosis therapy. This drug's potential to induce the hepatic cytochrome P450 oxidative enzyme system increases the risk of drug-drug interactions. Thus, although the presence of comorbidities typically necessitates the use of multiple drugs, the co-administration of rifampicin and warfarin may lead to adverse drug events.

Risk of recurrent venous thrombosis related to past provoking risk situations: follow-up of a cohort study.

Strategies targeting at classifying the risk for recurrent venous thrombosis are needed. We previously hypothesized, by studying a cohort of patients, that those who had 'survived' risk situations for venous thrombosis without developing it would, after a first venous thrombosis, have a low recurrence risk. Therefore, we re-evaluated the same cohort, now with a longer follow-up.