Q wave abnormalities are usually suggestive of myocardial infarction and are explored further in the appropriate parts of ECG. Q wave length of ≥0.03 second was seen in 20% of normal male individuals in the posterior leads V7-V9. Teenagers may experience amplitudes of 0.4 mV or more. Young adults get deeper Q waves more often. The amplitude is typically less than 0.2 mV, although it may reach 0.3 mV or even 0.4 mV. The Q waves last no more than 0.03 seconds. When the transitional zone lies on the right side of the precordium, Q waves are more likely to be present. ![]() Q waves in these leads are more common in younger participants than in older people. They are most common in lead V6, less often in leads V5 and V4, and seldom in V3. More than 75% of normal people have small Q waves in their left precordial leads. In many, but not all, ECG leads, a typical person will have a modest Q wave. There is no Q wave when the initial deflection of the QRS complex is vertical. The QRS complex begins with the Q wave, the first downward deflection following the P wave. ![]() Q waves, on the other hand, may be linked to one or more of the elements: (i) Effects of physiology and place, (ii) Myocardial damage or replacement, and (iii) Ventricular hypertrophy. Q waves on ECG are the deflection of the QRS complex that is initially negative.Ī Q wave technically signifies that the net direction of early ventricular depolarization (QRS) electrical forces projects toward the negative pole of the lead axis under consideration.Īlthough strong Q waves are a hallmark of myocardial infarction, they may also be seen in various non-infarct conditions.įailure to recognize the different origins of Q waves might result in significant diagnostic mistakes.Ī Q wave does not suggest any particular electrophysiological process.
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