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26 Cards in this Set
- Front
- Back
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Active (exploring) electrode |
an electrode which senses the electrical field |
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Passive (indifferent) electrode |
a reference electrode (not sensing the field), considered to be at 0 mV |
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Unipolar lead |
combination of an active plus a passive electrode. Measure the voltage only at the active electrode |
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Bipolar lead |
combination of 2 active electrodes. Measure the voltage difference between the 2 electrodes |
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Limb leads |
provide information in the frontal plane of the body |
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Chest leads |
provide information in the transverse plane of the body
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Lead I |
RA (-) and LA (+) |
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Lead II |
RA (-) and LL (+) |
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Lead III |
LA (-) and LL (+) |
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P wave |
first wave in cardiac cycle depolarization of both atria .08-.10 seconds in duration |
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QRS complex |
depolarization of both ventricles .05-.10 seconds |
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Q wave |
first negative deflection following the P wave |
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R wave |
first positive deflection following the P wave |
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S wave |
a negative wave following the R wave |
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T wave |
Repolarization of the ventricles |
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T wave inversion |
may indicate coronary ischemia or left ventricular hypertrophy |
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Tall and narrow symmetrical T waves |
hyperkalemia |
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Flat T waves |
coronary ischemia or hypokalemia |
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U waves |
repolarization of papillary muscles |
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If prominent U waves seen |
hypokalemia hypercalcemia thyrotoxicosis |
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PR segment |
period between atrial and ventricular depolarization |
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ST segment |
corresponds to period between completion of ventricular depolarization and beginning of ventricular repolarization (plateau of ventricular AP) |
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PR interval |
represents time for atrial depolarization and the delay through the AV node .12-.20 sec |
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QT interval |
time for ventricular depolarization and repolarization |
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PP interval |
time between consecutive atrial depolarizations can be used to determine atrial rate |
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RR interval |
Time between consecutive ventricular depolarizations can be used to determine ventricular rate |
