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Questions and Answers
What does the S-T segment on an ECG represent?
What does the S-T segment on an ECG represent?
- The interval between ventricular depolarization and repolarization (correct)
- The propagation of cardiac action potential from atria through AV node to ventricles
- Thick lines on ECG paper representing 5 mm intervals or 0.2 sec
- 1 thick-lined box (5 small boxes) representing 0.2 sec or 5mm
Which leads are used to observe the lateral wall of the heart?
Which leads are used to observe the lateral wall of the heart?
- V5, V6, lead I, and lead aVL (correct)
- V1, V2, V3, V4, and V5
- V1 and V2
- None of the above
How many thick-lined boxes on an ECG paper represent 1 second?
How many thick-lined boxes on an ECG paper represent 1 second?
- Tick marks on ECG paper rhythm strip
- Thin lines on ECG paper
- 1 thick-lined box (5 small boxes
- 5 thick-lined boxes (25 small boxes (correct)
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Study Notes
- Thin lines on ECG paper represent 1 mm intervals or 0.04 sec.
- Thick lines on ECG paper represent 5 mm intervals or 0.2 sec.
- 1 thick-lined box (5 small boxes) represents 0.2 sec or 5mm.
- 5 thick-lined boxes (25 small boxes) represent 1 second.
- Tick marks on ECG paper rhythm strip represent 3 secs.
- P-R interval represents the propagation of cardiac action potential from atria through AV node to ventricles.
- S-T segment represents the interval between ventricular depolarization and repolarization.
- V1, V2, V3, V4, and V5 are leads used to observe different areas of the heart.
- V1 and V2 primarily observe the ventricular septum.
- V5, V6, lead I, and lead aVL observe the lateral wall of the heart.
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