ECG signs of myocardial infarction: pathological Q-waves & pathological R-waves

ECG signs of myocardial infarction: pathological Q-waves & pathological R-waves
Pathological Q-waves are evidence of myocardial infarction Myocardial infarction  – particularly if extensive in size – typically manifests with pathological Q-waves. These Q-waves are wider and deeper than normally occurring Q-waves, and they are referred to as pathological Q-waves. They typically emerge between 6 and 16 hours after symptom onset, but may occasionally develop earlier. Standard textbooks have traditionally taught that the pathological Q-wave is a permanent  ECG  manifestation and that it represents  transmural infarction (STEMI) . However, recent studies challenge these notions. Pathological Q-waves may resolve in up to 30% of patients with inferior infarction. The amplitude of Q-waves may also diminish over time. Moreover, magnetic resonance imaging has suggested that pathological Q-waves may also arise due to extensive  subendocardial infarction (NSTEMI) . If pathological Q-waves occur as a result of myocardial infarction, the infarction may be classified as  Q-wave infarctio…

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