Long-Term Prognostic Value of Less Stringent Electrocardiographic Q Waves and Fourth Universal Definition of Myocardial Infarction Q Waves

The Fourth Universal Definition of Myocardial Infarction defines electrocardiographic (ECG) Q waves as duration ≥30ms and amplitude ≥1mm or QS complex in two contiguous leads. However, current taskforce criteria may be overly restrictive. Therefore, we investigated the association of isolated, lenient, or strict Q waves with long-term outcome.

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