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Telemetry Study Guide
Terms in this set (13)
Physiology of the Heart
The atria contract together to push blood into the ventricles.
Once the atria are stimulated to contract, there is a pause to allow the atria to contract completely before the ventricles are stimulated.
The ventricles contract after being filled by the atria.
Cardiac cells have....
Automaticity: They are able to generated an electrical impulse on their own.
Conduction Pathway and Inherent Rates...
SA node --> AV node/Bundle of HIS --> Right & Left Bundle --> Purkinje Fibers
SA Node - 60-100 bpm
AV Node - 40-60 bpm
Ventricular Rate - 20-40 bpm
What causes the P wave?
SA node depolarizes the atria.
What causes the PR interval?
AV node delays impulse creating a pause. Impulse is carried from HIS and Bundle branches to Purkinje fibers.
What causes QRS complex?
What causes the T wave?
Q = Negative Deflection after PRI
R = Tall positively deflected waves
S = Negative deflection after R wave
Begins at the J point and ends at the start of the T wave
Rhythm interpretation (6 steps)
1. Regularity of rate
2. Calculate rate
3. Identify & examine P waves
4. Measure PR interval
5. Measure QRS interval
6. Measure QT interval
Multiply the number of QRS complexes in a 6 second strip by 10 or Count the number of large boxes between 2 complexes and divide by 300.
Small boxes measure...
Large boxes measure...
Small = 0.04 seconds each
Large = 0.2 seconds each
PR interval normal...
QRS interval normal...
QT interval normal...
PR interval = 0.12-0.2 seconds
QRS interval = 0.06-0.1 seconds
QR interval = <0.44 seconds or half R-R
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