Active clinical trials for "Hemorrhage"

Polypectomy is regarded as high risk for bleeding. Several guidelines recommend continuous use of aspirin during polypectomy. However for clopidogrel, widely used antiplatelet agent, cessation of 5-7 is recommended. There is insufficient data regarding clopidogrel on post polypectomy bleeding. Delayed bleeding after polypectomy in patients with clopidogrel was reported as 3%. A recent study showed that delayed bleeding rate in patients with clopidogrel didn't differ that of who stopped clopidogrel. However the rate for delayed bleeding was 4%, higher than the previous studies. More studies are needed to conclude the safety of polypectomy in clopidogrel users. Cold snare polypectomy (CSP) can resect polyps without electrical energy. CSP are safe than conventional endoscopic mucosal resection in high risk for bleeding. The polypectomy techniques in most of studies were heterogenous, where delayed bleeding was investigated in clopidogrel users. There is no study to investigate safety of CSP in patients with clopidogrel users to date. The investigators hypothesized that the bleeding risk of CSP in patients with clopidogrel users would be similar to that of aspirin users. In this multicenter prospective study, the investigators aimed to compare the safety of CSP between aspirin and clopidogrel users.

This study aims at clarifying the current situation of Emergency treatment of aneurysmal subarachnoid hemorrhage (SAH) in China, and analyzing the safety and efficacy of the treatment strategy between interventional treatment and open surgery, so as to improve the diagnosis and treatment of aneurysmal SAH.

The purpose of this study is to determine if the use of aspirin prior to colonoscopy increases the risk of post polypectomy bleeding. The primary end point is comparison of bleeding rates after polypectomy of a continuous aspirin group and temporally aspirin-quit group. The secondary end point is analysis of risk factors which affect early or delayed post polypectomy bleeding.

The purpose of this study is to determine which of the following drugs: enoxaparin, dabigatran and rivaroxaban causes least blood loss after total hip replacement (THR).

Hypothesis A "multifaceted" intervention program aimed at increasing the responsiveness of care givers, the adequacy of care provided, and the efficacy of organisation of care, in presence of abnormal blood loss in the immediate post partum has more impact on the incidence of severe PPH and on the costs of care than the current methods of dissemination of clinical practice guidelines. Intervention Intervention group. The intervention includes three components: (1) outreach visits with local presentation of evidence-based clinical practice guidelines for management of PPH, and discussion of their applicability in the context of local organisation; (2) during these educational visits, reminders - check list, "PPH emergency case" containing appropriate materials - to be used in case of PPH, will be proposed; (3) finally, cases of severe PPH will be reviewed during peer review sessions organized in each participating unit, to help identifying weaknesses in care provided, and needs for improvement. Control group. The proposed guidelines for management of PPH will be disseminated through the participating perinatal networks; then each unit will be free to implement them at its own convenience. Randomisation procedure The trial follows a cluster randomised trial design. Randomisation of maternity units will be stratified by region, status (public versus private) and size (annual number of deliveries). The stratified design will guarantee the comparability of the two arms of the trial at baseline. Outcome measures The primary outcome is the incidence of severe PPH (number of severe PPH to number of deliveries). A severe PPH is defined as a PPH that was associated with one or more of the following: peripartum haemoglobin drop greater than 4g/dl, blood transfusion, arterial embolisation, surgical procedures such as hysterectomy or arterial ligation, transfer of the mother to intensive care unit, maternal death. Secondary outcomes include the cost of care and the cost/efficacy ratio, and the incidence of adverse effects of uterotonic drugs.

Florbetapir F 18 is an experimental radioactive drug that may allow doctors to image changes in the brain using a PET (Positron Emission Tomography) scanner. The purpose of this study is to evaluate the imaging characteristics of, Florbetapir F 18 (also known as 18F-AV-45) in patients who have previously undergone bleeding in their brains. Florbetapir F 18 binds to amyloid-ß peptide (Aß) that accumulates in the brains of patients with bleeding. These accumulations are called amyloid plaques and when extensive are labeled cerebral amyloid angiopathy (CAA). Florbetapir F 18 sticks to the amyloid plaques in the brain and emits a low level of gamma rays which can be detected by a PET camera. MRI detected microbleeds have been identified as markers of clinically silent hemorrhage from bleeding-prone vessels. Another imaging marker of vessel damage and risk of bleeding is the spot sign (SS). Finally, certain genetic signatures (ApoE genotype) have been shown to be associated with Aß deposition in the brain or predispose patients to higher risks of bleeding. This research study will explore the interactions of these factors and understand the physiology of intracerebral bleeding.

Up to 5% of patients with recurrent gastrointestinal (GI) bleeding remain undiagnosed by EGD and colonoscopy, the presumed source of bleeding in these patients being the small intestine. These patients fall under the category of "obscure gastrointestinal bleeding," and frequently require an extensive diagnostic work-up. For these reasons, most patients who present with obscure or occult gastrointestinal bleeding typically undergo multiple endoscopic evaluations, including capsule endoscopy and various radiologic imaging studies, including enteroclysis, small bowel series, CT scan, angiography, and radionuclide scan. Recently, many centers (included the Brigham and Women's Hospital) have begun using capsule endoscopy and CT enterography (CTE) for evaluation of suspected small bowel pathology. This is an observational study enrolling patients referred to the Brigham and Women's Hospital for obscure gastrointestinal bleeding designed to compare the diagnostic yield of various diagnostic modalities, in particular capsule endoscopy and CT enterography in the evaluation of obscure gastrointestinal bleeding.

The rate of complication and death of patients with acute digestive tract bleeding is increased in the setting of acute coronary heart disease. The aim of the study is to establish the relative importance of the risk factors contributing to the death rate from acute digestive tract bleeding in patients admitted with acute coronary heart disease.

This is a prospective, observational study of 60 adult patients anticoagulated with bivalirudin for extracorporeal membrane oxygenation (ECMO). The study aims to identify the most precise early warning blood test or panel of blood tests to predict bleeding in patients on bivalirudin/ECMO. The project will involve comparing currently used blood tests with an extended panel of coagulation and metabolic blood tests with the aim of early warning of impending bleeding to allow intervention in the form of adjusted bivalirudin dose, modification of other risk factors, or transfusion with hemostatic products targeted to documented coagulation test abnormalities.

Burn surgery is associated with significant reductions in hematocrit. However, it is unclear whether these reductions are the result of hemodilution from non-red cell containing intraoperative transfusions or from loss of red blood cells. The investigators will be using the Daxor Blood Volume Analyzer (BVA-100), an FDA approved instrument that can measure total blood volume, plasma volume, and RBC volume using the indicator dilution technique. By comparing pre-operative measurements of blood volume, plasma volume, and RBC volume to that of post-operative measurements after burn surgery, the investigators can determine the primary cause of the reduction in hematocrit associated with burn surgery. The investigators hypothesize that these reductions in hematocrit are primarily the result of hemodilution rather than blood loss and that there will be a statistically significant difference in measured plasma volume from the pre-operative group to the post-operative group.