BASIC ECG INTERPRETATION Questions with Correct Solutions

BASIC ECG INTERPRETATION Questions with Correct Solutions


Question:
1. cardiac conduction is based on

Answer:
Automaticity (ability of heart cells to spontaneously generate an action potential)


Question:
2. Conductivity

Answer:
(ability for cardiac cells to transmit action potential from one cell to another)


Question:
3. Rhythmicity

Answer:
(ability for cardiac cells to spontaneously generate an action potential at a regular rate)


Question:
4. SA node rate

Answer:
60-100 beats/min


Question:
5. AV node rate

Answer:
40-60 beats/min


Question:
6. purkinje fibers rate

Answer:
15-40 beats/min


Question:
7. ECG complex

, Answer:
-Bottom line = "isoelectric line" -Waves should leave isoelectric line and come back to it
-*Each box represents 0.04 seconds* -K+ inside cardiac cells and Na+ outside cardiac cells;
this switches when we have electrical movement (e.g., atrial depolarization)




Question:
8. P wave

Answer:
Atrial depolarization Atrial contraction




Question:
9. PR interval

Answer:
Time (in seconds) from onset of atrial depolarization to the onset of ventricular depolarization
(impulse travels from the SA node to the AV node with a brief delay to allow the atria to
empty)




Question:
10. QRS complex

Answer:
Ventricular depolarization Time it takes for the impulse to travel through the Bundle
Branches and purkinje fibers