Frequently used as an abbreviation for secondary to. You might also see it written as 2 or 2/2. Feb 7, '11. We were told to use s/t instead of r/t if the defining characteristic you cite in your NDX statement is an MDX rather than a sign or symptom.
Examples of heart-related causes of chest pain include: Heart attack. A heart attack is a result of a blood clot that's blocking blood flow to your heart muscle. Angina. Thick plaques can gradually build up on the inner walls of the arteries that carry blood to your heart.
Other, less common causes of chest pain include: 1  A blockage in a major artery of the lungs (pulmonary embolism) 2  An enlarged or thickened heart (hypertrophic cardiomyopathy) 3  Narrowing of a valve in the main part of the heart (aortic stenosis)  Swelling of the sac around the heart (pericarditis)