Myocardial infarction without Q waves or equivalent acute and chronic phase

Myocardial infarction without Q waves or equivalent acute and chronic phase 

In probably more than 50% of cases, an MI with normal intraventricular conduction and narrow QRS does not show a Q wave of necrosis or equivalent (R in V1-V2). However, it may show anomalies in the mid-late part of QRS (as low r in lateral leads, rsr , slurrings, etc. (fractionedQRS)). Also repolarisation changes may be recorded especially in the acute phase. The incidence of MI without Q wave is variable depending on whether it is detected. In the emergency department it is higher and in the CCU lower. 

All the types of MI without Q waves or equivalent are summarised in Table 10.1. This also includes the cases of MI without Q wave that present abnormal ventricular activation as BBB, WPW and pacemaker. These different types of MI without Q wave will be now discussed in detail. 

Non-Q-wave myocardial infarction ST-segment depression and/or negative T wave (Table 10.1) 

Large infarctions exist within the non-Q-wave group of infarctions, including cases secondary to involvement of LMT that have not generated an 

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