Cardiac Emergencies are a crucial part of an EMT's training, and there are three emergencies that they cannot afford to miss. Firstly, they must be able to recognize a myocardial infarction, commonly known as a heart attack. This requires keen observation of symptoms such as chest pain, shortness of breath, and nausea. Secondly, EMTs must be able to identify cardiac arrest, where the heart stops beating altogether. This requires immediate CPR and the use of an automated external defibrillator (AED). Lastly, they must be able to differentiate between angina and a heart attack. While both involve chest pain, angina is usually less severe and can be alleviated by rest or medication. Overall, these three emergencies are critical for an EMT to identify and respond to efficiently.