MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is considered pathological and positive for necrosis when its width is less than 30 msec and its voltage is greater than 0.1 mV.
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It is never seen in patients with a structurally healthy heart.
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It always represents the scar of a myocardial infarction
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It can be produced by the septal depolarization vector or by a myocardial infarction.
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Detailed explanation-1: -Q wave represents the depolarization of the interventricular septum. It is represented as a small downward deflection.
Detailed explanation-2: -The three waves of the QRS complex represent ventricular depolarization.
Detailed explanation-3: -Electrocardiogram Interpretation Q waves that are pathologically deep but not wide are often indicators of ventricular hypertrophy. Q waves that are both abnormally deep and wide imply myocardial infarction.
Detailed explanation-4: -Pathologic Q waves are a sign of previous myocardial infarction. They are the result of absence of electrical activity. A myocardial infarction can be thought of as an elecrical ‘hole’ as scar tissue is electrically dead and therefore results in pathologic Q waves.