Circulatory system myocardial infarction
Myocardial infarction - Sounds like something you would hear on on of those TV shows like ER or Grays 
Anatomy in prime time. So what does it really mean, Well the definition is tissue death due to the lack of oxygen to he heart muscles. It’s also the medical term for the lay person meaning a heart attack. Is it life threatening? It can be without the proper medical attention. Is it something that a massage therapist should be concerned with, yes as you assess your client and they have the symptoms of a heart attack victim they are contraindicated and should be referred to the immediate medical attention. Severe chest pain that occurs when the myocardium is deprived of adequate oxygen is called angina pectoris often mistaken for a heart attack the symptoms are very similar in nature.
A cardiac cycle or a complete heartbeat happens approx 72 times a minute in the average human adult at rest. The heartbeat is coordinated by electrical signals from nodes which are inside the heart. There are four structures embedded in the wall of the heart specialized to generate strong impulses and conduct them rapidly to certain regions of the heart wall. These structures make up the conduction system of the heart and they are sinoatrial node (SA), atrioventricular node (AV), AV bundle, and purkinje fibers. The SA Node is known at the hearts pacemaker and if it failed is why someone your need an artificial pacemaker. The largest of the arteries is the aorta, and the smallest of he arteries is called arterioles.
