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21 Cards in this Set
- Front
- Back
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What two leads do you check to determine mean electrical axis?
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Lead I and aVF - if both upright then axis is normal
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If Lead I is downwards and aVF is upwards, where is the mean electrical axis?
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It's a right axis deviation
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If lead I is upwards and aVF is downwards, where is the mean electrical axis?
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It's a left axis deviation
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If both lead I and aVF are downward, where is the mean electrical axis?
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Extreme deviation - in the upper right quadrant
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Another method for finding mean electrical axis is to find the most ______ lead and draw a line ________ to it
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isoelectric
perpendicular |
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How long is a normal PR interval?
QRS complex? |
.12-.2 sec
.08-.12 sec |
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ST segment elevation indicates what?
ST segment depression indicates what? |
Myocardial infarction
Ischemia |
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QT interval should be less than half of what?
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the distance from QRS to QRS
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When the PR interval is prolonged (more than _ sec) and there is a P before every QRS and QRS after every P - what condition is it?
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.12-.2 sec
1st degree heart block |
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If you see ST elevation in leads I and aVL - which part of the heart is affected? which artery?
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Lateral part
Circumflex artery |
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If there is ST elevation in leads II, III, and aVF, which part of the heart is affected? Which artery?
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Inferior
Right coronary artery |
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What part of the heart is V1 and V2 covering? Which artery?
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Septal wall ischemia, infart or injury
Left anterior descending |
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Which part of the heart is V3 and V4 covering? which artery?
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Anterior wall ischemia, infarct, or injury
Left anterior descending |
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Which part of the heart is V5 and V6 covering? which artery?
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Lateral wall (along with lead I and aVL)
Could be circumflex or left anterior descending artery |
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If you see RSRprime (or bunny ears) in V1 and V2 - what are you looking at?
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Right bundle branch block
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If you had a widened QRS complex (.2 sec instead of below the normal __ sec) in leads I and aVL - what condition?
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Left bundle branch block
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Left ventricular hypertrophy is present if: _ wave in V1 + _ wave in V5>35
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S
R |
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What syndrome is it when there is a delta wave before the QRS compex and PR interval is less than .12 seconds
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Wolf Parkinson White syndrome - will go into arrhythmia
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ECG changes with ischemia:
Inverted T waves in which leads? ST ______ Nonspecific ST/T wave changes |
I, II, V2-V6
depression |
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ECG changes of infarction:
T waves peaked initially, then _____ ST segment _______ Recipricol __ depression |
inverted
elevation (acute injury) or depression (infarction or angina) ST |
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If you have large R with ST depressions in lead V1 and V2, which artery is affected? What area of the heart?
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posterior
right coronary artery |
