[en] [en] First-degree atrioventricular block First-degree atrioventricular block [en] [en] [en] [en] first degree heart block [en] [en] [en] [en] [en] [en] [en] first degree heart block [en] First-degree atrioventricular block [en] [en] [en] [en] [en] [en] [en] First-degree atrioventricular block [en] [en] [en] [en] [en] First-degree atrioventricular block [en] [en] First-degree atrioventricular block I First-degree atrioventricular block [en]