O uso do pool de plasma caseiro interfere no valor da rni?

Introduction: The prothrombin time (PT) test is commonly used to monitor anticoagulant levels in patients undergoing oral anticoagulant therapy. Currently, anticoagulation levels have been assessed through the international normalized ratio (INR) value. Objective: The objective of this study was to determine if inhouse preparations of polled plasma, containing five (P5) and 20 (P20) samples, respectively, may be used as normal control of PT and to assess its interference in INR values. Material and methods: The experiment was performed in 32 days. Both polled plasma preparations were analyzed in comparison with a commercial control (PC). PT was performed for PC, P5 and P20 daily and the INR value for PC, P5 and P20 was assessed in patients undergoing oral anticoagulant therapy. The applied statistical tools were mean value (X), analysis of variance and Tukey test. Results: There were no statiscally significant differences in PT and INR for PC, P5 and P20. Conclusion: In-house polled plasma (P5 and P20) may be applied as normal control of PT and it does not interfere in the INR value.

Perfil hematológico, hemostático e terapêutico da intoxicação experimental

Pós-graduação em Medicina Veterinária - FMVZ

Trombose venosa profunda aguda: avaliação prospectiva do início do processo de revanalização das veias dos membros inferiores pelo mapeamento dúplex em cores

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Análise do controle de anticoagulação oral em pacientes portadores de próteses valvares cardícas mecânicas por meio de ambulatório especializado: experiência de 10 anos

Pós-graduação em Bases Gerais da Cirurgia - FMB

Estado nutricional relacionado à vitamina K de pacientes portadores de doença vascular em tratamento anticoagulante oral ambulatorial com varfarina sódica

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Comparação da ocorrência de complicações tromboembólicas e hemorrágicas em pacientes portadores de prótese valvares cardíacas mecânicas com um e dois folhetos na posição mitral

Introdução: Pacientes portadores de próteses valvares cardíacas mecânicas devem medicados continuamente com anticoagulantes orais para evitar acidentes tromboembólicos. Estes pacientes são avaliados continuamente para o controle da anticoagulação oral. Objetivo: Comparar a ocorrência de complicações tromboembólicas e hemorrágicas em portadores de próteses valvares cardíacas mecânicas de um (mono) e de dois (bi) folhetos na posição mitral em terapêutica anticoagulante. Métodos: Foram estudados, no intervalo de 10 anos, 117 pacientes portadores de prótese na posição mitral, sendo 48 com próteses de folheto único e 69 de folheto duplo. Avaliou-se a ocorrência de complicações tromboembólicas e hemorrágicas de grau maior e menor de acordo com a gravidade. Os resultados estão apresentados sob forma de estudo atuarial e de frequência linearizada de ocorrência de eventos. Resultados: As curvas atuariais mostraram que, ao longo do tempo, os pacientes portadores de próteses valvares monofolheto estiveram menos livres de complicações tromboembólicas que os pacientes com próteses bifolheto, enquanto que, estes últimos (bifolheto) estiveram menos livres de acidentes hemorrágicos. As frequências linearizadas de ocorrência para tromboembolismo foram maiores nos pacientes com próteses monofolheto. Nos episódios hemorrágicos as taxas foram maiores para os portadores de próteses bifolheto. Conclusão: Os portadores de próteses valvares cardíacas monofolheto mostraram-se mais propensos à ocorrência de acidentes tromboembólicos graves em relação aos com próteses bi folheto. Os pacientes com prótese bifolheto apresentaram maior sangramento que os pacientes com prótese monofolheto, no entanto, esta diferença se restringiu aos sangramentos de pouca gravidade.

Recanalization after acute deep vein thrombosis

O processo de recanalização das veias dos membros inferiores, após um episódio de trombose venosa profunda aguda em pacientes anticoagulados com heparina e inibidores da vitamina K, faz parte da evolução natural da remodelagem do trombo venoso. Esse complexo processo de remodelagem envolve a adesão do trombo à parede da veia, à resposta inflamatória da parede do vaso, levando à organização e subsequente contração do trombo, à neovascularização e à lise espontânea de áreas no interior do trombo. A presença de fluxo arterial espontâneo em veias com trombose recanalizada tem sido descrita como secundária à neovascularização e se caracteriza pelo desenvolvimento de fluxo com padrão de fístulas arteriovenosas, identificadas por meio de mapeamento dúplex colorido. Nesta revisão, são discutidos alguns aspectos controversos da história natural da trombose venosa profunda, para uma melhor compreensão da sua evolução e do seu impacto sobre a doença venosa.

Comparison of initial loading doses of 5 mg and 10 mg for warfarin therapy

CONTEXTO:A melhor dose para o início do tratamento anticoagulante com varfarina vem sendo debatida nos últimos dez anos. Em nosso meio, não observamos nenhum estudo comparativo quanto a estas características.OBJETIVO:Comparar segurança e eficácia de dois esquemas de dosagem inicial de varfarina para tratamento anticoagulante.MÉTODOS:Foram estudados prospectivamente 110 pacientes de ambos os sexos, consecutivos, com indicação de anticoagulação por tromboembolismo venoso ou arterial. Durante os três primeiros dias de tratamento, estes pacientes receberam doses adequadas de heparina (RT - razão dos tempos - alvo entre 1,5 e 2,5) e 5 mg de varfarina, cuja dose foi reajustada a partir do quarto dia pelo Razão Normatizada Internacional - RNI (alvo entre 2 e 3). Esse grupo foi comparado com série histórica de 110 pacientes que receberam 10 mg nos dois primeiros dias, 5 mg a partir do terceiro dia, com ajuste posterior de dose baseado no RNI. Os desfechos foram: recorrência do tromboembolismo, sangramentos e tempo para alcançar níveis terapêuticos.RESULTADOS:A eficácia, a segurança e o tempo de internação foram similares entre os grupos. O grupo que recebeu 10 mg atingiu níveis terapêuticos mais precocemente (média de 4,5 dias × 5,8 dias), sendo as doses na alta menores e os níveis terapêuticos mais adequados na primeira visita de retorno.CONCLUSÃO:O esquema de dosagem de 10 mg proporcionou menor tempo para alcançar nível terapêutico, com menores doses de varfarina na alta e RNI mais adequado no retorno.

Long-term clinical and ultrasonographic evaluation of thrombophilic patients with deep venous thrombosis

OBJECTIVE:The purpose of this study was to evaluate the long term clinical and ultrasonographic outcomes of thrombophilic patients with deep venous thrombosis (DVT).METHOD:Cohort study, retrospective case-control with cross-sectional analysis. Thirty-nine thrombophilic patients and 25 non-thrombophilic patients were assessed 76.3 ± 45.8 months after diagnosis. Demographic and family data were collected, as well as data from clinical and therapeutic progress, and physical and ultrasound examinations of the limbs were performed. Groups were matched for age and gender and the variables studied were compared across groups.RESULTS:Deep venous thrombosis was more frequent in women. The most common thrombophilias were antiphospholipid syndrome and factor V Leiden mutation. There was no difference between groups in terms of the number of pregnancies or miscarriages and the majority of women did not become pregnant after DVT. Non-spontaneous DVT prevailed. Proximal DVT and DVT of the left lower limb were more frequent, and the main risk factor was use of oral contraceptives. All patients were treated with anticoagulation. There was a higher frequency of pulmonary embolism in non-thrombophilic patients. Most patients considered themselves to have a normal life after DVT and reported wearing elastic stockings over at least 2 years. Seventy-one percent of patients had CEAP > 3, with no difference between groups. Deep venous reflux was more frequent in thrombophilic patients.CONCLUSION:There were no significant differences between groups with respect to most of the variables studied, except for a higher frequency of pulmonary embolism in non-thrombophilic patients and greater frequency of deep venous reflux in thrombophilic patients.

Anticoagulant treatment for subsegmental pulmonary embolism

BackgroundAcute pulmonary embolism (PE) is a common cause of death, accounting for 50,000 to 200,000 deaths annually. It is the third most common cause of mortality among the cardiovascular diseases, after coronary artery disease and stroke.The advent of multi-detector computed tomographic pulmonary angiography (CTPA) has allowed better assessment of PE regarding visualisation of the peripheral pulmonary arteries, increasing its rate of diagnosis. More cases of peripheral PEs, such as isolated subsegmental PE (SSPE) and incidental PE, have thereby been identified. These two conditions are usually found in patients with few or none of the classic PE symptoms such as haemoptysis or pleuritic pain, acute dyspnoea or circulatory collapse. However, in patients with reduced cardio-pulmonary (C/P) reserve the classic PE symptoms can be found with isolated SSPEs. Incidental SSPE is found casually in asymptomatic patients, usually by diagnostic imaging performed for other reasons (for example routine CT for cancer staging in oncologic patients).Traditionally, all PEs are anticoagulated in a similar manner independent of the location, number and size of the thrombi. It has been suggested that many patients with SSPE may be treated without benefit, increasing adverse events by possible unnecessary use of anticoagulants.Patients with isolated SSPE or incidental PE may have a more benign clinical presentation compared with those with proximal PEs. However, the clinical significance in patients and their prognosis have to be studied to evaluate whether anticoagulation therapy is required.ObjectivesTo assess the effectiveness and safety of anticoagulation therapy versus no intervention in patients with isolated subsegmental pulmonary embolism (SSPE) or incidental SSPE.Search methodsThe Cochrane Peripheral Vascular Diseases Group Trials Search Co-ordinator searched the Specialised Register (last searched October 2013) and CENTRAL (2013, Issue 9). MEDLINE, EMBASE, LILACS and clinical trials databases were also searched (October 2013).Selection criteriaRandomised controlled trials of anticoagulation therapy versus no intervention in patients with SSPE or incidental SSPE.Data collection and analysisTwo review authors inspected all citations to ensure reliable selection. We planned for two review authors to independently extract data and to assess the methodological quality of identified trials using the criteria recommended in the Cochrane Handbook for Systematic Reviews of Interventions.Main resultsNo studies were identified that met the inclusion criteria.Authors' conclusionsThere is no randomised controlled trial evidence for the effectiveness and safety of anticoagulation therapy versus no intervention in patients with isolated subsegmental pulmonary embolism (SSPE) or incidental SSPE, and therefore we can not draw any conclusions. Well-conducted research is required before informed practice decisions can be made.

Recanalization Rates after Acute Deep Vein Thrombosis: A Single-center Experience Using a Newly Proposed Vein Diameter Variation Index

Background: Duplex ultrasound scanning (DUS) is the method of choice for diagnosis of deep vein thrombosis (DVT). However, only a few studies have performed prospective serial DUS after an acute episode of DVT to assess its evolution. This study aimed to report our experience using DUS combined with a thrombosis score (TS) and a newly proposed vein diameter variation index (VDVI) to evaluate the rate of resolution of DVT by assessing and quantifying the early stages of vein recanalization in proximal vein segments within 6 months after an episode of acute lower extremity DVT.Methods: Twelve patients with first episode of acute lower extremity DVT confirmed by DUS as occurring in <= 10 days after the onset of venous thrombosis symptoms were followed up prospectively for 6 months. TS and VDVI were calculated at 1, 3, and 6 months to assess vein recanalization. Intra-thrombus arteriovenous fistula formation was also investigated and related to the recanalization process.Results: Seven (58%) women were included, with a total cohort median age of 53.5 +/- 19 years. The left lower extremity was affected in 7 (58%) patients. DVT was diagnosed in 55 proximal vein segments. All patients had proximal DVT, with involvement of the external iliac, femoral, and popliteal veins. After 6 months, there was a significant decrease in TS and increase in VDVI (P < 0.001) in all proximal vein segments assessed, indicating thrombus regression. The more distal the DVT was, the faster was the VDVI increase, with most popliteal veins being recanalized at 3 months (P < 0.001). Intra-thrombus arteriovenous fistula was identified in 50% of patients at 1 month while on anticoagulation.Conclusions: The combined use of two different DUS-based assessment tools, TS and the proposed VDVI, provided an effective method to prospectively assess vein recanalization rates after an episode of acute lower extremity DVT in this series of patients and may allow a correct evaluation of DVT and its resolution or progression.