Question
In which condition,the pecularity in the ECG marked by an arrow is seen?
A. Pericarditis.
B. Myocardial Infarction.
C. Normal.
D. Complete Heart Block.
Show Answer
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Correct Answer » B
Explanation
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Ans: B. Myocardial Infarction.
ECG in the image shows:
Deep Q waves (II, III, aVF) with T-wave inversion due to previous MI.
Q wave:
- A Q wave is any negative deflection that precedes an R wave.
Q waves in different leads
- Small Q waves are normal in most leads
- Deeper Q waves (>2 mm) may be seen in leads III and aVR as a normal variant
- Under normal circumstances, Q waves are not seen in the right-sided leads (V1-3)
Pathological Q Waves
Q waves are considered pathological if:
- > 40 ms (1 mm) wide
- > 2 mm deep
- > 25% of depth of QRS complex
- Seen in leads V1-3
Pathological Q waves usually indicate current or prior myocardial infarction.
Absent Q waves
- in V5-6 is most commonly due to LBBB.
