McGill University (in conjunction with the online journal of cardiology) have developed this resource which contains a huge number of ECGs and clincial case scenarios divided by clinical area or shown in a quiz format. Test yourself and compare your interpretation of the ECGs with their answers. Not the slickest site to use, and not all cases have interpretations, but pretty good none-the-less.
Dr MD Rosengarten, McGill University
Less than 10 mins
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