Conduction sytem
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each of the black spaces below before clicking
on it to display the answer.
Help!
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| List the 4 pacemaker sites | SA
AV Junction
Ventricular
Atrial
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| PR interval that identifies conduction delay thru the AV Junction | > 0.20
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| How do you calculate heart rate with an irregular rhythm | count the number of P waves and multiply by 10
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| How do you calculate heart rate with an regular rhythm | count the number of small blocks in P-P interval and divide by 1500
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| Lead Placement/Color RA LA Chest RL LL |
white
black
brown
green
red
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| Represents depolarization of atrial electrical cells | P wave
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| Represents time the impulse is passing thru the AV junction to the ventricles | PR segment
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| Time required for electrical impulse to depolarize atria, travel thru AV node & Bundle of His to ventricles | PR interval
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| Normal PR interval | 0.12 - 0.20
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| Measures how long it takes the ventricles to depolarize and repolarize | QT interval
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| Normal QT interval | 0.35 - 0.43
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| Measures time for electrical impulse to transverse both ventricles | QRS width
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| Normal QRS width | 0.10 or less
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| The first positive deflection from the baseline | R wave
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| negative deflection from baseline following the R wave | S wave
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| represents beginning of ventricular repolarization | ST segment
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| represents last 2 phases of ventricular repolarization | T wave
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| represents depolarization of the ventricle | QRS complex
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| the first downward or negative deflection from baseline | Q wave
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| Normal QRS width | 0.10 or less
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| Pacemaker Site: no P wave with normal QRS | Pacemaker Site:
AV Junction
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| Pacemaker Site: no P waves with wide QRS | Pacemaker Site:
Ventricles
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| Pacemaker Site: PR interval < 0.12 | Pacemaker Site:
AV Junction
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| Pacemaker Site: PR interval 0.12 or greater | Pacemaker Site:
SA node or Atria
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| "pacemaker of the heart" 60-100 bpm | SA node
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| Not a back up of the SA node | Atrial pacemaker site
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| Monitor displays only this rate | ventricular
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| Signs and symptoms of low cardiac output | -decreased level of consiousness
-weak, thready pulses
-loss of peripheral pulses
-decreased urine output
-cool, clammy skin
-delayed capillary refill
-chest pain
-decreased blood pressure
-CHF
-AMI
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Created by:
blondie1630
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