ECG Basics 1 Flashcards
Name what is happening at each step.
On ECG paper
1 large block = ____ seconds
____ large blocks = 1 second
___ large blocks = 3 seconds
- 1 large block = 0.2 seconds, with each small box repreentnig 0.04 seconds
- 5 large blocks = 1 second
- 15 large blocks = 3 seconds
1 small box measured vertically = ____
1 large box measured vertically = _____
2 large boxes measured vertically = _____
- 1 small box measured vertically = 0.1 mV
- 1 large box measured vertically = 0.5 mV
- 2 large boxes measured vertically = 1 mV
For ventricular rhythms, examine the ______.
For atrial rhythm, examine the _______.
-
R-R intervals
- Q: Are they regular? Is each heart beats R-R interval equal?
- P-P intervals
How do we calculate HR?
[Number of QRS complexes in 6 seconds] * [10]
P wave
- NL amplitude:
- NL duration:
- NL amplitude: 0.05 to 0.25 mV (0.5 to 2.5 small boxes)
- NL duration: 0.06 - 0.11 seconds (1.5 -2.75 small boxes)
PR interval indicates the ___________.
NL?
How is this affected as HR increases?
- AV conduction
- NL: 0.12 to 0.2 seconds (3-5 small boxes)
- Shortens as HR increases
QRS wave: ventricular depolarization and contraction
- NL duration
0.08- 0.10 seconds
T wave: ventricular repolarization
We should take note of what kind of T waves?
Downward (negative) deflection or ones with tall, pointed peaks.
QT interval represents the time of_________
Ventricular depolarization + ventricular repolarization
-begining of QRS wave => end of T wave
QT interval is _______seconds (_____ boxes)
0.36 to 0.44 seconds (9-11 boxes)
ST segment represents the ______________
The ST segment is the line ___________
- ST segment represents the early part of ventricular repolarization.
- The ST segment is the line that from the end of the QRS complex to beginning of the T wave.