...since when was this considered a myth?? The heart is positioned asymmetrically, with only about a third of it being actually behind the sternum. Two thirds are on the left side.
Yeah, no.
Web MD: https://www.webmd.com/heart/picture-of-the-heart
"The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system."
University of Michigan: https://healthblog.uofmhealth.org/heart-health/anatomy-of-a-human-heart
"Located between the lungs in the middle of the chest, the heart pumps blood through the network of arteries and veins known as the cardiovascular system. It pushes blood to the body’s organs, tissues and cells. "
Quora answer from a cardiologist: https://www.quora.com/If-our-heart-is-in-the-middle-why-do-we-feel-the-heartbeat-on-the-left
"The question is correct that most of the heart lies in the center of the chest. Only a variable sized portion protrudes to the left.
So if most of the heart is in the center, then why isn’t the hearbeat felt in the center of the chest?
There are two reason you don’t (typically) feel a heart beat in the center of the chest:
The sternum is a thick bony structure that decreases the transmission of force of the heart beating. (There actually is vibration there - it is just too small typically to feel. You can hear the vibrations with a stethoscope however.)
The Right Ventricle pumps less blood. The Right Ventricle is under the sternum and (typically) in the center of the chest beats less vigorously than the Left Ventricle because it is only pumping blood through the lungs as opposed to the entire body.
The reason you feel the heart beat to the left is that a portion of the left ventricle lies against the skin between the rib cage on the left side - and effectively “bounces” contraction waves against that soft area. The result is a “PMI” - point of maximal impulse where the heart beat can most be felt. As the heart enlarges, the PMI moves further and further laterally, away from the center. The PMI can sometimes be used to diagnose abnormal heart enlargement."
Youtube video explainer: https://www.youtube.com/watch?v=idkPch61aMw
last edited at Oct 28, 2020 4:02PM