1. A method of analyzing ECG signals of a subject comprising the computer implemented steps of: receiving a subject electrocardiogram signal to be analyzed; using a library of example predefined signals indicative of known cardiac syndromes, producing distance measures indicating similarity of the subject signal to the example predefined signals; forming a sequence of vectors from the produced distance measures; and using the sequence of vectors as input into a classifier which determines therefrom existence of any cardiac syndromes in the subject.