ECG
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Normal pacemaker of the heart | SA node
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| · Located where the superior vena cava enters the right atrium | SA node
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| SA node Fires at a rate of | 60-100 bpm
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| Internodal tracts and Bachmann’s bundle | Existence of 3 internodal tracts is debatable
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| Impulse travels to left atrium via Bachmann’s bundle | Internodal tracts and Bachmann’s bundle
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| AV node is located | in the inferior right atrium
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| AV node Delays impulse by _______seconds to give | by 0.04 seconds to give ventricles a chance to fill while atria contract
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| AV node cannot generate an________ but ______ can | AV node cannot generate an impulse but junctional tissue can
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| Beginning of the ventricular conduction system | Bundle of His
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| _______Divides into right and left bundle branches | Bundle of His
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| Bundle of His is where a Peacemaker fires at a rate of | 40-60 bpm when SA node doesn’t fire or impulse doesn’t reach AV note
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| Extend down right and left side of interventricular septum | Bundle branches
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| · Covers endocardial surfaces of both ventricles, spreads to myocardium and epicardium | Purkinje fibers
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| Purkinje fibers is where a Peacemaker fires at a rate of | 20-40 bpm when impulse is blocked at/above bundle branches
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| P wave represents | the electrical conduction through both atria.
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| P wave Precedes_______, is ______ and ________. | QRS complex; is Rounded and smooth
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| PR interval represents | _the impulse travel time through the AV node, through the bundle of His, and to the Purkinje fibers
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| PR interval Measured | from the start of the P to the end of the Q/r where it starts to go down.
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| Normal duration is - normal length for the PR interval is | 0.12 to 0.20 second. Should not be longer than 0.2 seconds and this is what you need to know.
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| QRS complex Represents | QRS complex indicates that the electrical impulse has traveled through the ventricles
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| QRS complex follows | the PR interval
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| QRS complex consists of | 3 waves: Q (1st – deflection), R (1st + deflection), and S (2nd – deflection)
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| QRS complex normal duration is | 0.06 to 0.10 second
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| Represents the end of ventricular depolarization and the beginning of ventricular repolarization | ST segment
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| ST segment follows | QRS, from end of S wave to beginning of T wave
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| T wave Represents | Ventricular repolarization recovery
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| T wave flows what? | Follows the ST segment
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| What wave is slightly rounded and smooth? | T wave
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| QT interval represents ___? | Represent ventricular depolarization - repolarization of ventricle cycle
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| QT interval is measured from _________. | Start of Q to end of T
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| QT interval duration is | normal QT interval is 0.12 to 0.42 seconds
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| How do you figure the rate? | 1500/# ob boxes between two R points
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| Sinus Bradycardia | is less than 60
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| Sinus Tachycardia | is over 100
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| Normal Sinus | 60-100
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