11 things only a true hypochondriac will relate to The Infographic describes the key elements of 2015 AHA Guidelines Update for CPR. These guidelines are given by American Heart Association updated every 5 years www.
Preload is the stretch. The amount of volume being returned to the right side of the heart from systemic circulation. Afterload is the squeeze. The amount of resistance the left side of the heart has to overcome in order to eject blood.