APA format for MSN degree 2 references from Walden University Library
 
A heart attack or Myocardial infarction (MI) is the leading factor of death in adults worldwide (Nicolai et al., 2018).  MI occur in patients when the blood flow to the heart is blocked due to increased built of plaque within the walls of the blood vessels. Patients can experience sharp, sudden pain or heaviness in their chest as the first sign when experiencing an MI.  This pain can be in the chest and move up to the jaw and down the left arm. When blood flow is decreased to the heart, there is an insufficient amount of oxygen supplied to the heart, and the electrolyte become imbalanced specifically potassium, calcium, and magnesium.  The heart can only handle the blood, oxygen, and electrolyte imbalances for twenty minutes before tissue begins to die, at this point is the damage is irreversible (Huether