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6 Cards in this Set
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PR interval
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time for impulse to pass from atria (SA node) to the ventricles
0.12-0.2 sec (3-5 boxes) |
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QRS complex
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width of QRS complex is time required for impulse to fully pass through the ventricles
0.06-0.12 sec (1.5-3 boxes) |
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ST segment
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both ventricles are fully depolarized (no dipole)
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QT interval
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time with action potential of ventricular muscle cells
*varies inversely with HR 0.3-0.4 sec |
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Sinus arrhythmia
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cyclic variation in the frequency of SA node discharges linked to the respiratory cycle
inspiration--> increase HR expiration--> decrease HR |
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AV block
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primary: PR interval constant and prolonged ( >0.2 sec)
Wenckenbach/Type I/secondary: PR interval prolonged with occasionally dropped QRS (series is consistent P:QRS ratio) tertiary: no temporal relationship b/w P & QRS |
