I am so excited to take part in this, my second, A – Z Challenge! Last year I did the challenge using “recipes” as my inspiration. Well, this year I’m going to draw on my nursing background and use “parts of the human body” as my inspiration! Hmmm…a part of the body that starts with “Q”, “X” or “Z”….
It should be a lot of fun and I’m looking forward to seeing how everyone interprets the Challenge!
After the abundance of P’s I have reached a “Q”drought!! I could really only think of one part of the body that starts with the letter “Q” and that is the Quadriceps muscle. Because I explained muscles in my “M” post I felt it would be repetitious to mention something muscle related again.
However, there is something else that starts with “Q”, and well I suppose, not technically a part of the anatomy of the human body, it is the name of something within the human body that is necessary to our survival. So, without further ado, “Q” is for QRS Complex:
If you have ever been in an Emergency Department, an Intensive Care Unit, or a Cardiac Unit or had an electrocardiogram (ECG also known as an EKG) then you may well have seen a QRS Complex.
The QRS complex is a name for the combination of three of the graphical deflections seen on a typical ECG.
It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization*(see below) of the right and left ventricles of the human heart.
Typically an ECG has five deflections, arbitrarily named “P” to “T” waves. The Q, R, and S waves occur in rapid succession, do not all appear in all leads, and reflect a single event, and thus are usually considered together.
If you refer to image #1 above, and follow along, you will see that a Q wave is any downward deflection after the P wave. An R wave follows the Q as an upward deflection, and the S wave is any downward deflection after the R wave. This is what comprises the QRS complex.
*Depolarization – With every beat, the heart is depolarized to trigger its contraction. This electrical activity is transmitted throughout the body and can be picked up on the skin. This is the principle behind the ECG.