The patient who is an admitted long time IV drug user would be at risk for infective endocarditis. Intravenous drug use is a significant risk factor for this condition due to the potential introduction of bacteria into the bloodstream, which can then adhere to heart valves or endocardial surfaces.
The other options provided refer to different clinical signs and symptoms that might indicate other conditions but are not specifically associated with a higher risk for infective endocarditis.