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Correct!! Basic Dysrhythmia-Relias
1. Normal Sinus Rhythm
ANSWER: Heart rhythm originating in the sinoatrial node with a rate in patients at rest of 60 to 100
beats per minute
2. Sinus Arrhythmia
ANSWER: Appearance is ALMOST NORMAL: Respiratory - Circulatory interaction. Rate INCREASES with
INSPIRATION (IN=IN)
3. Sinus Bradycardia
ANSWER: <60 (normal sinus rhythm)
4. Sinus Tachycardia
ANSWER: >100 (100-150) (normal sinus rhythm)
5. Premature Atrial Contraction (PAC)
ANSWER: Heart Rate: Depends on underlying rhythm. Regularity: Interrupts the regularity of underlying
rhythm. P-Wave: can be flattened, notched, or unusual. May be hidden within the T wave. PRI:
measures between .12-.20 seconds and can be prolonged; can be different from other complexes. QRS:
<.12 seconds
6. Sinus Arrest/Pause
, ANSWER: - SA node doesn't fire. - notice absence of P-wave for a complete cycle (a missed cycle). length
of pause ≠ multiple of normal rate (block)
7. Atrial Fibrillation (A-Fib)
ANSWER: An irregular and often very fast heart rate originating from abnormal conduction in the atria
8. Atrial Flutter
ANSWER: Irregular beating of the atria; often described as "a-flutter with 2 to 1 block or 3 to 1 block"
9. Junctional Rhythm
ANSWER: 40-60 Regular! - impulse from AV node w/ retro/antegrade transmission. - P wave often
inverted/buried/follow QRS. - slow rate. - narrow QRS (not wide like ventricular)
10. Junctional Tachycardia
ANSWER: >60 bpm (ms. K; 150-250). - KEY: will be regular (consistent). - AV junction produces a rapid
sequence of QRS-T cycles. - p-wave often inverted/buried/follow QRS
11. Premature Junctional Contraction
ANSWER: Inverted P wave or hidden P wave. PRI <0.12 or none. Normal QRS
12. Supraventricular Tachycardia (SVT)
ANSWER: An abnormal heart rhythm arising from aberrant electrical activity in the heart; originates at
or above the AV node
13. First Degree Heart Block
ANSWER: Atrioventricular (AV) block in which the atrial electrical impulses are delayed by a fraction of a
second before being conducted to the ventricles
14. 2nd Degree Heart Block Type 1 (Wenkebach)
ANSWER: Progressively longer PR interval until the P wave is not followed by a QRS