In biology, an adaptation, also called an adaptive trait, is a trait with a current functional role in the life of an organism that is maintained and evolved by means of natural selection. Adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation.
Computed Tomography Angiogram (CT Angiogram). Guide. A computed tomography angiogram (CT angiogram) is a test that uses X-rays to provide detailed pictures of the heart and the blood vessels that go to the heart, lung, brain, kidneys, head, neck, legs, and arms.
Clinical examination, electrocardiogram and skiagram of. chest have very low sensitivity in evaluation of pericardial. diseases. Echocardiography has high sensitivity and. specificity in evaluation of various pericardial diseases. Low. cost and widespread availability make it the most useful non-. invasive investigation for initial evaluation.