The medical error is defined as a professional misconduct -most often it comes down to: -errors in diagnosis; treatment errors; errors in subsequent medical care, i.e. improper behavior implementation; errors, which exceed the limits of the free medical choice -i.e. freedom of action. One of the most common mistakes is a discrepancy between the initial and the final diagnosis of sick children with a cardiovascular system disease, especially whenheart murmur is observed.-patients whoseheart murmur is assessed innocent and the final diagnosis is cardiomyopathy -initial diagnosis is cardiomyopathy, and the final diagnosis is normal hearth We present three clinical cases with a potential risk of evaluation error in the clinical condition, related to diseases of the cardiovascular system. The presented patients with the aforementioned nosological entities are indicative of the difficulties in determining a correct clinical diagnosis, respectively conductingan effective treatment and risk prevention from fatal ending of the described severe diseases. The medical error, there is only one single importance -it gives a lesson to everyone else!
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