Active clinical trials for "Stroke"

The aim of this study is to evaluate the low-response prevalence of early antiplatelet therapy and to test the influence of different aspirin dosages in patients with acute ischemic strokes (AIS).

To investigate stroke risk using the National Academy of Sciences Twin Registry.

To identify the role of salt-sensitivity of blood pressure in the pathogenesis of hypertension.

The purpose of this study is to compare the incidence of silent and apparent cerebral embolism between conventional and minimal-invasive transfemoral aortic valve repair.

Facing the lack of recommandations of Neurology and cardiology societies, the investigators decided in 2002 some Good Medical Practices to define a specific and precise population for whom the closure of permeable oval formaen after a first CVA seem to be necessary. Current survey of these patients after implantation of a prothesis in interauricular septum is defined by a consultation at 1, 3 and 6 months after surgery for a clinical exam and an echocardiography. One year after implantation, the investigators systematically realized a control by MRI associated to a contrast echography. In the aim of evaluating the investigators' medical practice, the investigators decided to do an observational study which will permit us to judge of the interest or lack of interest of our "Good medical practice" before the publication of prospective and randomised clinical studies.

The aim of the study is to evaluate the use of combined fluid attenuated inversion recovery (FLAIR) imaging and diffusion weighted imaging (DWI) as surrogate marker of lesion age within the first 6 hours of ischemic stroke in order to identify patients ≤ 3 or ≤ 4.5 hours of symptom onset in a large multicenter study hours of ischemic stroke. The investigators hypothesize that the pattern of a visible lesion on DWI together with a negative FLAIR ("DWI-FLAIR mismatch") will identify patients ≤ 3 hours of symptom onset with >80% specificity and positive predictive value.

In order to observe the influence of the Dengzhan Shengmai Capsule on the endpoint of patients with ischemic stroke, we hold the multi-centered prospective cohort study. From November 2007 to December 2009, 12000 subjects are included in 200 clinical research centers all over China. The subjects naturally formed two cohorts based on taking Dengzhan Shengmai capsule or not. The basic therapy included antiplatelet aggregation , stroke health education, management of blood pressure, blood lipid and blood glucose, etc. Then all of the subjects are visited on the 360th day after inclusion. The recurrence of stroke, cardiovascular events, and peripheral arterial events are observed.

In a previous suty, we have demonstrated that prior transient ischemic attack, treatment lipid-lowering drug or physical activity are associated to a better outcome of stroke. The aim of the study is to understand the mechanisms of this preventive neuroprotection by establishing link between biomarkers and preventive and neuroprotective measures.To answer to the question, we conduct a cohort study of stroke patients.

Using a proprietary insurance health claims database, Eli Lilly and Company has contracted with an external party to conduct a retrospective cohort study of health claims for the time period from 1 January 2003 through 31 December 2006 (with follow-up of patients through 30 June 2007). This study will evaluate the potential association between atomoxetine and cerebrovascular events. In this study, the incidence of selected cerebrovascular outcomes as represented in health claims data among adult patients who initiate therapy with atomoxetine will be estimated. In particular the study will focus on cerebrovascular accident (CVA) and transient ischemic attack (TIA) as the outcomes of interest. The incidence for each outcome among atomoxetine initiators will then be compared to the incidence in a cohort of similar patients who initiate stimulant treatment and an age and gender-matched general population cohort. The atomoxetine and stimulant-initiating cohorts will be matched on a broad variety of variables, including age, gender, diagnoses, medication use, and healthcare utilization through the use of propensity score matching in order to minimize the influence of confounding by indication. The analysis will include the cohorts (atomoxetine and stimulant initiators) from a previous completed study with increased follow-up time (1 January 2003 through 30 June 2007) and accrue new atomoxetine and stimulant ADHD medication initiators over a 2 year period, so that the study will represent initiators between January 1, 2003 and December 31, 2006 with follow-up through June 30, 2007.

Of the ~700,000 persons who suffer a stroke each year, only 50% recover the ability to perform unlimited community walking. One mechanism contributing to locomotor dysfunction post-stroke is an increased metabolic cost of walking relative to neurologically healthy individuals 2-4. This increased cost likely limits the amount of walking performed, which further reduces functional capacity, thus contributing to long-term spiral of disability and decreased quality of life in these persons. In addition to increased metabolic cost, increased estimates of mechanical work are also characteristic of hemiparetic walking 2,29. Interestingly, although estimates of mechanical work reflect work done by locomotor muscles, little is known about the impact that peripheral muscle properties have on estimates of mechanical work. Furthermore, questions concerning how these properties relate to the increased metabolic cost of walking remain unanswered. The short-term objective and purpose of the proposed research is to determine the extent to which peripheral muscle characteristics, as well as estimates of muscle mechanical energy expenditure (MMEE), relate to the metabolic cost of walking post-stroke.