Heart Rhythms (EKG)
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1. normal sinus rhythm (NSR)
regular rhythm of the heart cycle stimulated by the SA
node (average rate of 60-100 beats/minute)
2. Sinus Bradycardia, less than 60 bpm
3. Sinus Tachycardia, Greater than 100 bpm
4. Premature Atrial Contraction (PAC) - irregular heart
rhythm characterized by atrial contractions occurring
before the expected time
5. Sinus Arrhythmia - in which the rate varies with respi-
ration, causing an irregular rhythm.
6. atrial fibrillation
occurs when the normal rhythmic contractions of the
atria are replaced by rapid irregular twitching of the
muscular heart wall
7. Preventricular Contraction (PVC)
Abnormal beat generated from the ventricles. Charac-
terized by a wide and bizarrely shaped QRS. Can be
unifocal (if deflections look the same) or multi focal (if
deflections look different)
8. ventricular tachycardia
A rapid heart rhythm in which the electrical impulse
begins in the ventricle (instead of the atrium), which
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