EKG Strips Review Study Practice Exam Questions.

EKG Strips Review Study Practice Exam Questions. 60-Hz interference - artifact caused by ungrounded equipment or overhead fluorescent lighting - CORRECT ANSWER 60 - CORRECT ANSWER What is the rate? 75 - CORRECT ANSWER What is the rate? 80-ish - CORRECT ANSWER What is the rate? 120-ish - CORRECT ANSWER What is the rate? Absolute Refractory Period - once the heart beats, there is a period of time that the heart will not/cannot beat again, as the cells are depolarization - CORRECT ANSWER What does the highlighted area represent? Relative Refractory Period - just as the T-wave is peaking- if you stimulate the myocardium, some cells have repolarized, some have partially repolarized, and some have not yet repolarized: Some cells will fire (repolarized), some cells will partially fire (partially repolarized), some will not fire yet (not yet repolarized)- cells are firing out of sync of each other - CORRECT ANSWER What does the highlighted area represent? "R on T" Phenomenon - When the ectopic beat (such as a PVC) falls on the T-wave from the previous contraction during the relative refractory period - this can send the myocardium into fibrillation, and can lead to ventricular fibrillation and death - CORRECT ANSWER 60 Hz Interference - artifact caused by ungrounded equipment or overhead fluorescent lighting - CORRECT ANSWER Normal sinus rhythm - CORRECT ANSWER Sinus bradycardia - CORRECT ANSWER Sinus tachycardia (there is a P-wave prior to every QRS) - CORRECT ANSWER Atrial tachycardia (unable to see P-waves, not in sinus rhythm) - CORRECT ANSWER SVT - CORRECT ANSWER Sinus arrhythmia = cyclic changes in the heart rate during breathing - CORRECT ANSWER PAC - has a different P-wave that comes before expected - CORRECT ANSWER