Heart Attack Severity Calculator is a program, written in HTML, aimed at physicians, nurses and medical students, which calculates the survival odds after a heart attack. To do so, you have to enter various information, regarding the patient's clinical history (previous myocardial infarctions, TIAs, etc.), vital signs (breathing rate, Glasgow coma scale, blood pressure, signs of congestive heart failure, etc.), instrumental data (ejection fraction, myocardial hypertrophy, number and type of coronaries diseased if any, etc), blood analysis (BUN, SGOT, CPK, pO2, and so on). Once every piece of data is at the proper place, the program calculates the survival percentage for that given clinical case, using a huge database of cases (more than 20 million, according to MediQual). Well, it's important remember that this program is for educational purposes, and not to be actually used in real life, but it gives teachers and students a lot of stuff to talk about. Every variable introduced affects in positive or negative the likelihood of survival. Explaining why and how this happens will be the core point of every lesson in which Heart Attack Severuty Calculator will be used.