EKG Heart Rhythms Study Exam Questions.

EKG Heart Rhythms Study Exam Questions. normal sinus rhythm (NSR) - CORRECT ANSWER regular rhythm of the heart cycle stimulated by the SA node (average rate of 60-100 beats/minute) Sinus Bradycardia - CORRECT ANSWER 60 bpm Sinus Tachycardia - CORRECT ANSWER 100 bpm Premature Atrial Contraction (PAC) - CORRECT ANSWER irregular heart rhythm characterized by atrial contractions occurring before the expected time Supraventricular Tachycardia (SVT) - CORRECT ANSWER an abnormal heart rhythm arising from abnormal electrical activity in the heart; originates at or above the AV node Sinus Arrest - CORRECT ANSWER - SA node doesn't fire - notice absence of P-wave for a complete cycle (a missed cycle) Sinus Arrhythmia - CORRECT ANSWER A sinus rhythm in which the rate varies with respiration, causing an irregular rhythm. atrial fibrillation - CORRECT ANSWER occurs when the normal rhythmic contractions of the atria are replaced by rapid irregular twitching of the muscular heart wall Preventricular Contraction (PVC) - CORRECT ANSWER Abnormal beat generated from the ventricles. Characterized by a wide and bizarrely shaped QRS.