EKG Interpretation

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Last updated 3:09 AM on 6/5/26
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41 Terms

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Positive impulses are

upward deflections

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Negative impulses are

downward deflections

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No electrical impulse creates

isoelectric line

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Each small box is equal to

1 mm/0.04 seconds

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Each large box is equal to

5 mm/0.20 seconds

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Bipolar leads include

lead I, II, III

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Lead I axis

0 degrees

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Lead II axis

60 degrees

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Lead III axis

120 degrees

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Augmented leads include

aVR, aVL, aVF

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AVR view comes from

RA lead

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AVL view comes from

LA lead

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AVF view comes from

LF lead

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Precordial leads include

V1-V6

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P wave represents

depolarizing atria

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Part of ECG that represents atrial contraction and systole

P wave

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PR interval represents

time it takes electrical impulse to travel from SA to ventricles

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PR interval is measured from the beginning of the

P-wave to the beginning of the QRS

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PR interval normal duration

0.12-0.20 seconds

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QRS represents

depolarizing ventricles

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Part of ECG that represents ventricular contraction and systole

QRS

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QRS normal duration

0.04-0.12 seconds

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T wave represents

repolarizing ventricles

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Part of ECT that represents ventricular filling and diastole

T wave

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QT interval represents

time it takes ventricles to depolarize then repolarize

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QT interval normal duration

0.33-0.42 seconds

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Absolute refractory period

a 2nd stimulus, no matter how strong, will not cause depolarization during this time

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Relative refractory period

the earliest time the heart can depolarize with a stronger than normal stimulus

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Relative refractory period starts in the

middle of T wave

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5 step interpretation process

rate, regularity, P-waves, PRI, QRS

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6-second rate calc method

count number of R-waves and multiply by 10

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Large block rate calc method

count number of large blocks between R-waves

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6 large blocks =

50 bpm

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5 large blocks =

60 bpm

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4 large blocks =

75 bpm

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3 large blocks =

100 bpm

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2 large blocks =

150 bpm

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1 large block =

300 bpm

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Regularly irregular is

predictable irregularity

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Irregularly irregular is

unpredictable irregularity

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Ectopic beat significance to rate count

include them unless they aren’t producing a pulse