Basics Flashcards
How many seconds is one small box?
.04 sec
How many small boxes makes up 0.20 seconds?
5
How many boxes make up 1 second?
5 big boxes
To calculate HR:
1. Count the number of ______ complex in a ______ second interval then ________ by 10
QRS complex; 6 sec; multiply
To calculate HR:
2. Count tiny boxes btwn ________, then do 1500/ by that number
R-R
What is depolarization?
contractility
describes atrial depolarization
P-wave
What describes atrial depolarization (contractility)?
P-wave
What is the time btwn atrial depolarization & ventricular depolarization?
** ALSO**
time electrical impulse goes from ___ node –> ___ node
P-R interval
SA, AV
What describes ventricular depolarization?
QRS
Which is bigger QRS or P-wave and why?
QRS b/c ventricles are bigger
What describes ventricular repolarization?
** You often don’t see it on EKG b/c it happens at same time as ventricular depolarization**
T-wave
What includes both depolarization & repolarization of the ventricle?
Q-T interval
The Q-T interval starts from ______ of Q to ______ of T-wave
beginning, end
What describes the early part of ventricular repolarization?
ST segment
