EKG Test Questions With Correct Answers

1 small box = __ seconds - Answer .04 s 1 large box = __ seconds - Answer .20 s __ small boxes = 1 large box - Answer 5 small boxes What is the amplitude of each small box? - Answer 1 mm or .1 mV The normal height of EKG standardization is __ mV or __ mm. - Answer 1 mV 10 mm What formula can be used to calculate heart rate given the R-R interval? (assume regular rhythm) - Answer 300 / # large boxes in R-R interval 1500 / # small boxes in R-R interval If there are 3 large boxes in the R-R interval, the heart rate = __ . (assume regular rhythm) - Answer 100 bpm How do you determine HR given an irregular rhythm? - Answer Measure out 6 seconds (6 second rule). Count the # of complexes in 6 sec and multiply by 10. List 3 criteria for normal sinus rhythm. - Answer 1) Rate between 60-100 2) Every normal P wave followed by QRS 3) P wave upright in leads I and II, inverted in aVR. Length of normal PR interval = - Answer .12 - .20 s (3 to 5 small boxes) Define PR interval - Answer from ONSET of P wave to ONSET of QRS Length of normal QRS = - Answer <0.10 s Define QRS interval - Answer from ONSET of QRS to END of QRS Define QT interval - Answer from ONSET of QRS to END of T wave = systole List the FRONTAL leads - Answer I, II, III, aVR, aVL, aVF List the HORIZONTAL leads - Answer V1-6 Lead I runs from the __ to the __. - Answer Right arm to left arm.