Cardiac conditions. Certain subtypes of troponin (cardiac I and T) are very sensitive and specific indicators of damage to the heart muscle (myocardium). They are measured in the blood to differentiate between unstable angina and myocardial infarction (heart attack) in people with chest pain or acute coronary syndrome.
Virtual reality (VR) typically refers to computer technologies that use virtual reality headsets to generate the realistic images, sounds and other sensations that replicate a real environment or create an imaginary setting. VR also simulates a user's physical presence in this environment.
Seaman is a naval rank and is either the lowest or one of the lowest ranks in most navies around the world. In the Commonwealth it is the lowest rank in the navy. The next rank up is able seaman, followed by leading seaman, which is followed by the petty officer ranks. In the United States, it means the lowest three enlisted rates of the U.S. Navy and U.S. Coast Guard, followed by the higher petty officer ranks.