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Conversely, in people under the age of 14, the heart is physically immature.  Therefore there are certain abnormalities which include T-wave inversions, V1, V2 and V3 are common in young people.  Unfortunately this ECG pattern overlaps with that seen in arrhythmogenic right ventricular cardiomyopathy so there is a risk of generating false positives in that situation.  In summary, if we screened people under the age of 14, we may have false negatives in relation to hypertrophic cardiomyopathy and we may have false positives in relation to arrhythmogenic right ventricular cardiomyopathy.