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.
The term blue-water navy is a maritime geographical-term in contrast with brown-water navy and green-water navy. The Defense Security Service of the United States has defined the blue-water navy as a maritime force capable of sustained operation across the deep waters of open oceans.