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25 Cards in this Set

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What does the T wave represent?
Ventricular repolarization
What does the PR segment represent?
Delay in the AV node.
What does the QRS represent?
Ventricular depolarization. Normal reading >.12 seconds.
How is the PR Interval measured and what normal measurement?
From the beginning of P wave to the very beginning of the QRS. Normal measure is .12-.20 sec.
What does the P wave represent?
Atrial Depolarization.
List four external interferences that can be produced on the EKG.
Muscle tremors
shivering
patient movement
loose electrodes
60-cycle electrical current.
If the electrical flows towards the positive electrode, what direction the deflection will be?
Upright deflection.
If the electrical flow moves toward the negative electrode, what direction the deflection will be?
Downward deflection.
How many Leads do you nd to know to interpret arrhythmias?
One; only a monitoring Lead.
Which chambers contract first in single cardiac cycle?
The atria.
What do the vertical lines on the graph paper tell you?

What do the horizonatl lines on the graph tell you?
Time

Voltage
A strip that haves a consistent irregular pattern is called?
Regular Irregular.
A strip that haves a reading hard or can't measure is called?
Totally Irregular.
A strip that you can measure is called?
Basically Irregular.
What does Pulse mean?
The flow of blood thru an arterial wall.
If the rythm is regular what is the most accurate way to measure the BMP?
Count the No# of small squares between to R waves and divide total by 1500.
What is a second way to measure BMP w/ regular rhythm on a strip.
Count the No# of large boxes between two R waves and divide by 300.
What is third way to measure a BMP on a strip?
Count the of R waves in 6-second strip and multiply by 10.
What is a cardiac cycle on the EKG?
Electrical impulses associated with a single heart beat; P,Q,R,S and T.
What is the name of the normal cardiac rhythm with a healthy heart which means it will read:
1. Regular, bpm of 60 -100, QRS of less than .12sec.,a round and smooth p wave and a PRI of .12-.20.sec.
Normal Sinus Rhythm (NSR).
How can you tell whether or not an arrhythmia is regular?
Measure the R-R interval or the P-P interval.
What does a normal sinus P wave look like?
It has a smooth rounded shape and upright & uniform.
What is "supraventricular" arrhythmia?
An arrhythmia that originates above the ventricles.
If a QRS complex measures more the .12 seconds, what can this mean?
That the rhythm is supraventricular or a rhythm that started in the ventricles and/or delay in Ventricular conduction.
What does it mean when the P wave is said to be "lost" in the T wave?
It means that the P wave occured very close to the T wave and is covered or obcured and you can't idnetify it.