Before revision:   In addition, all records have a complex diagnosis. With this database a new algorithm for delineation of the ECG signal was successfully tested, taking into account the set of ECG signal leads and automatically determining the morphologies of the complexes. Earlier this algorithm showed competitive accuracy on QTDB database, which has only 2 leads. All the advantages of the developed algorithm were completely revealed when analyzing the fully annotated 12-lead database presentedin this paper .
After revision:  In addition, all records have an attributed diagnosis. These features make LUDB a promising tool for validating ECG delineation algorithms across a broad range of ECG signal shapes and patient diagnoses. A case study for the recently proposed wavelet-based algorithm is presented .