Table 3.
Differential Characteristics of Q waves of LVH by HCM of Q waves of Infarction
| Differential elements of Q waves of LVH by HCM from Q waves of infarction | ||
|---|---|---|
| Q Waves of HCM | Q Waves of Myocardial Infarction | |
| Duration | ≤35 ms | ≥40 ms (except aVR and V1). In infants and children with anomalous origin of coronary arteries, q waves have a duration >30 ms or depth > than 25% of the next R. |
| Aspect | “Clean,” narrow and deep (“dagger‐like”) | With notches and accompanied by lesion current with superior convexity and ischemia. |
| Location | In lateral wall (V5–6, I, aVL) and/or inferior wall (II, III, aVF). q waves in lateral wall. Q waves are more common than Q waves in inferior leads | Variable and segmentary |
| Cause | Abnormal distribution of the myocardial mass | Result from absence of electrical activity; transmission of potentials of cavity of the heart surface with a new electrical balance of forces that get away from the affected region. |
| Symptoms | There may be chest pain. | Characteristic prolonged pain. |
| Serum enzymes and troponin | Not increased | In the acute phase, increase of CKMB, AST, LDH, and troponin |
| Age group | Young people and even children | More common in elderly people, except for anomalous origin of coronary arteries. |