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Discover 23,284 clinical trials near Maryland. Find research studies in your area.
Showing 12921-12940 of 23,284 trials
NCT01906021
Background: \- Ablation is a procedure that heats tumor tissue to a high temperature to destroy it. Doctors perform this procedure by putting a probe in the tumor. This delivers heat to the site. Currently, doctors tell what area is heated by using the probe s manufacturer estimates. These estimates are imprecise. Doctors insert small needles to measure the temperature around the area being heated. Doctors also perform scans of the area, but these cannot show which tissue has been heated and which has not. Right now, only contrast scans can show that. But researchers have developed software that uses images from routine scans to create a temperature map. They want to test the software to see if doctors can monitor the procedure without using more needles and without contrast scans. Objectives: \- To test software that might help doctors perform ablations better in the future. Eligibility: \- People over 18 years of age already scheduled to have an ablation. Design: * Participants will be screened with a medical history. * Participants will visit the clinic for their already-scheduled ablation. The doctor will use the study software to analyze the temperature in the area being heated. The software will not come into contact with a participant s body. \- Participants will undergo scans that are necessary for the procedure, but one or two additional scans may be done as part of this study.
NCT03789175
Background: Nicotinamide riboside (NR) is a vitamin B3 dietary supplement. It may help improve muscle function, that may in turn may improve a person s exercise capacity. Researchers want to study how skeletal muscle responds to NR in an individual who has Li-Fraumeni Syndrome and slow muscle energy recovery after exercise. Objective: To study how nicotinamide riboside affects skeletal muscle after exercise. Eligibility: One person at least 18 years old with Li-Fraumeni syndrome and a certain gene mutation Design: The participant will be screened with a medical history, physical exam, and blood and urine tests. The participant may also have a heart test. The participant will maintain their regular diet and supplements during the study. The participant will take the study drug as 1-4 tablets twice a day for 12 weeks. The participant may be contacted with reminders and questions about side effects. The participant will have 4-5 visits over 18-30 weeks. At visits, the participant will repeat screening tests. At some visits they will also have: * Ultrasound of the heart with a wand placed on the chest. * Test of oxygen used at rest and exercise, while wearing a face mask. * Exercise test on a treadmill or bicycle with electrodes on the skin. * Magnetic resonance spectroscopy. The participant will have no caffeine for 12 hours. Then they will lie in a machine for about 2 hours. Sometimes they will lie still. Sometimes they will be asked to move. Health questionnaire The participant may have a skin sample taken by needle. The participant will be withdrawn from the study if they become pregnant.