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First-degree atrioventricular block

disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds

Pronunciation
/fəːst - dɪˈɡriː ˌeɪtrɪəʊvɛnˈtrɪkjʊlə blɒk/
/fərst - dəˈɡri ˌeɪtrioʊvɛnˈtrɪkjələr blɑk/