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8 Cards in this Set

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  • Back
define the P, QRS and T wave.
P= atrial depolarization
QRS= Ventricular depolarization
T= Ventricular repolarization
When does atrial repolarization occur?
During the QRS complex, but it is masked by the larger signal from ventricular depolarization.
When does conduction through the A-V node take place?
During the PR interval.
What happens during the QT interval?
Mechanical contraction of the ventricles.
When might you see a U wave on an ECG?
Hypokalemia
What are the normal time values for the PR and QRS complex?
PR= 0.12-0.2 sec
QRS= 0.12 sec
What are the ECG changes associated with these types of heart blocks?
1st degree
2nd degree(Mobitz 1)
2nd degree (Mobitz 11)
3rd degree
1st= PR interval> 0.20sec
2nd(M1)= Pr intervals progressively increase from beat to beat until they are long enough that a beat is dropped.
2nd(M11)= PR interval > 0.20 second at a fixed ratio of dropped beats.
3rd= No relationship between P wave and QRS complex
What are the ECG changes associated with:
Atrial fibrillation
Atrial flutter
Ventricular fibrillation
Atrial fibrillation= Irregularly spaced QRS complexes with intervening erratic spikes instead of P waves(irregularly irregular)
Atrial flutter= Sawtooth baseline
Ventricular fibrillation= Completely abnormal rhythm that has no recognizable waves or complexes.