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Discover 17,836 clinical trials near Boston, Massachusetts. Find research studies in your area.
Showing 6981-7000 of 17,836 trials
NCT03265431
This study is performed to assess if PET-MR imaging can improve treatment of patients with irregular heart rate and heart failure. Heart failure occurs when the heart muscle is too weak to do his work correctly. Irregular heart rate can be related to numerous diseases. One category of irregular heart rate is called ventricular arrhythmia. It is often seen in patients who have had a heart attack. This type of arrhythmia can be dangerous and can cause sudden death. To prevent these arrhythmias, doctors can perform procedures that burn the source of arrhythmia in the heart muscle. This is called ablation. Unfortunately, ablation does not fix the problem in 100% of patients and some will still have the arrhythmia requiring repeated procedure. The purpose of this study is to find new ways of guiding the doctors performing ablation, hoping to improve the success rate of the procedure.
NCT03480282
Guidelines recommend not screening adults with \<10-year life expectancy for cancer; however, primary care physicians feel uncomfortable talking to older adults about prognosis. The investigators aim to determine whether providing PCPs with scripts on patient prognosis and older adults with information on their prognosis would be useful when recommending stopping cancer screening.
NCT04710550
The overall objective is to obtain an initial assessment of the value of using \[18F\]3F4AP for imaging demyelinating diseases such as traumatic brain injury (TBI), neurodegenerative diseases such as mild cognitive impairment (MCI) and Alzheimer's Disease (AD): * Aim 1) Assess the safety of \[18F\]3F4AP in healthy volunteers and subjects with traumatic brain injury (TBI) and neurocognitive impaired subjects (AD/MCI). Hypothesis 1: Administration of \[18F\]3F4AP will result in no changes in vitals or other adverse events. * Aim 2) Assess the radiation doses to the main organs in healthy volunteers. Hypothesis 2: the radiation doses to each organ will be comparable in all subjects and within the acceptable limits. * Aim 3) Assess the pharmacokinetics of a bolus infusion of \[18F\]3F4AP in humans including healthy volunteers and patients. Hypothesis 3: the pharmacokinetics of \[18F\]3F4AP at the whole brain level will be similar in controls, TBI and AD/MCI subjects. The kinetics in demyelinated lesions will be slower than in healthy areas. * Aim 4) Correlate MR images with \[18F\]3F4AP PET images. Hypothesis 4A: all the lesions seen on the MRI will show increased signal (VT or SUV) on the PET images. Hypothesis 4B: some of the lesions on the MRI will show increased signal (VT or SUV) on the PET but not all. * Aim 5) Correlate \[18F\]3F4AP PET signal with neuropsychological testing in people with TBI and AD/MCI. Hypothesis 5A: increased PET signal (VT or SUV) will correlate with impaired Mini Mental State Examination (MMSE).