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6 Cards in this Set
- Front
- Back
PR interval
|
time for impulse to pass from atria (SA node) to the ventricles
0.12-0.2 sec (3-5 boxes) |
|
QRS complex
|
width of QRS complex is time required for impulse to fully pass through the ventricles
0.06-0.12 sec (1.5-3 boxes) |
|
ST segment
|
both ventricles are fully depolarized (no dipole)
|
|
QT interval
|
time with action potential of ventricular muscle cells
*varies inversely with HR 0.3-0.4 sec |
|
Sinus arrhythmia
|
cyclic variation in the frequency of SA node discharges linked to the respiratory cycle
inspiration--> increase HR expiration--> decrease HR |
|
AV block
|
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 |