Abstract：In recent years, due to the widespread application of early therapies such as thrombolysis and percutaneous coronary intervention, the incidence of Q-wave myocardial infarction significantly decreases. Meanwhile, the duration and amplitude of Q waves will gradually decrease or even disappear over time, which significantly increases the incidences of non-Q-wave myocardial infarction(NQMI) and non-ST-segment elevation myocardial infarction(NSTEMI). However, neither NQMI nor NSTEMI has characteristic changes on 12-lead electrocardiogram. For this reason, both of them are prone to be missed clinically and thus other new specific indexes are needed. Fragmented QRS complex (fQRS) is a new indicator which shows high sensitivity and specificity in identifying and predicting myocardial infarction. In this paper, we will elaborate the mechanism of fQRS and the role it plays in the diagnosis of myocardial infarction.
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