Pathological Q waves are more than 1mm wide (40 msec), 2mm tall, more than 1/4 of the QRS height. They are associated with myocardial infarction, old or current.See also: QRS complex
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This ECG is from a man in his 50s who presented with chest pain on a background of known coronary artery disease.
This ECG shows ST elevation with Q waves, high voltage QRS and atypical ST morphology for acute ischemia. On angiography he had three vessel disease but no obvious acute culprit. Serial troponins did not rise and serial ECGs showed no evolution.