EKG/ECG Flashcards
On an EKG/ECG strip each small square represents how many seconds of time?
0.04 seconds
The nurse is assessing an ECG strip and counts 30 LARGE squares. How many seconds of time did the nurse count?
6 seconds
30/0.2=6
What is the point where the QRS complex meets the ST segment?
J-point
A normal PR interval should be measured between?
0.12-0.20 seconds
characteristics a normal p-wave should have?
One p-wave should accompany a QRS complex.
P-waves should be round and upright.
A QRS complex should measure no more than?
0.12 seconds
How to calculate the atrial rate?
How to calculate the ventricular rate?
P-P
R-R
When heart muscle cells are in the resting state they have what type of charge?
Negative
The process that causes a heart cell to contract is known as?
Depolarization
When a heart muscle cell goes back into its negatively charged state, or in other words, when it relaxes this is known as?
repolarization
Which part of the electrical conduction system is located in the upper part of the right atrium and is responsible for atrial depolarization?
SA node
Once electrical signals pass through the Bundle of His, they next travel to?
Bundle of His–> L/R bundle branches –> Purkinje Fibers
Characteristics of the AV node
It causes a delay in electrical signal transfer so the atria can fully empty into the ventricles.
It’s known as the gatekeeper.
It’s found in the lower part of the right atrium just above the tricuspid valve.
Which part of the PQRST complex represents ventricular depolarization?
QRS complex
Which part of PQRST complex represents ventricular repolarization?
T-Wave
