BASIC ECG INTERPRETATION Questions with Correct Solutions
Question:
1. Basic ECG Interpretation
Answer:
-Normal conduction system = *electrical impulses* -Components of an ECG complex
-Determining rate & regularity -Measuring intervals (PR, QRS & QT) -*Identify*: Normal
Sinus Rhythm, Sinus Bradycardia, Sinus Tachycardia & Sinus Arrythmia & Treatment for
each
Question:
2. Conduction System of the Heart
Answer:
Question:
3. Cardiac Conduction System
Answer:
Question:
4. "*Primary Pacemaker*" of heart's conduction system?
Answer:
-SA node: 60-100
Question:
5. Inherent Rates
, Answer:
-*SA Node*: 60-100 -*AV node*: 40-60 (can take over when SA node fails) -*Purkinje Fibers*:
15-40
Question:
6. *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:
7. *P Wave* [Atrial depolarization]
Answer:
-The P wave indicates *atrial depolarization* or *atrial contraction* or *SA node activity* -So
if the question is "How long does it take the atria to depolarize?" - look at the P wave and
count the boxes!
Question:
8. *PR Interval* (PRI) - [Start of Atrial depolarization to start of Ventricular depolarization]
Answer:
-The PR Interval is the time (in seconds) *from the onset of atrial depolarization (start of P
Wave) to the onset of ventricular depolarization (start of small dip that begins QRS)* -The
impulse travels from the *SA node to the AV node* with a brief delay to allow the atria to
empty -Look closely and you can see in this example that the PR interval is approximately
0.16 seconds
Question:
1. Basic ECG Interpretation
Answer:
-Normal conduction system = *electrical impulses* -Components of an ECG complex
-Determining rate & regularity -Measuring intervals (PR, QRS & QT) -*Identify*: Normal
Sinus Rhythm, Sinus Bradycardia, Sinus Tachycardia & Sinus Arrythmia & Treatment for
each
Question:
2. Conduction System of the Heart
Answer:
Question:
3. Cardiac Conduction System
Answer:
Question:
4. "*Primary Pacemaker*" of heart's conduction system?
Answer:
-SA node: 60-100
Question:
5. Inherent Rates
, Answer:
-*SA Node*: 60-100 -*AV node*: 40-60 (can take over when SA node fails) -*Purkinje Fibers*:
15-40
Question:
6. *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:
7. *P Wave* [Atrial depolarization]
Answer:
-The P wave indicates *atrial depolarization* or *atrial contraction* or *SA node activity* -So
if the question is "How long does it take the atria to depolarize?" - look at the P wave and
count the boxes!
Question:
8. *PR Interval* (PRI) - [Start of Atrial depolarization to start of Ventricular depolarization]
Answer:
-The PR Interval is the time (in seconds) *from the onset of atrial depolarization (start of P
Wave) to the onset of ventricular depolarization (start of small dip that begins QRS)* -The
impulse travels from the *SA node to the AV node* with a brief delay to allow the atria to
empty -Look closely and you can see in this example that the PR interval is approximately
0.16 seconds
