{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,5,10]],"date-time":"2024-05-10T00:02:56Z","timestamp":1715299376599},"reference-count":27,"publisher":"Akademiai Kiado Zrt.","issue":"18","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Orvosi Hetilap"],"published-print":{"date-parts":[[2013,5]]},"abstract":"<jats:p>If New York Heart Association Class II\u2013IV heart failure is present, and ejection fraction \u226435%, electrocardiographic QRS width \u2265 120 ms in the presence of left bundle branch block, cardiac resynchronization therapy is indicated. Reevaluation of the data of cardiac resynchronization trials and electrophysiologic findings in left bundle branch block provided evidence that \u201ctrue\u201d left bundle branch block requires a QRS width of \u2265130 ms (in woman) and \u2265140 ms (in man). In \u201ctrue\u201d left bundle branch block, after the 40th ms of the QRS notched\/slurred R waves are characteristic in minimum two of I, aVL, V<jats:sub>1,<\/jats:sub>V<jats:sub>2<\/jats:sub>, V<jats:sub>5<\/jats:sub>and V<jats:sub>6<\/jats:sub>leads, in addition to a \u226540 ms increase of the QRS complex, as compared to the original QRS complex. In contrast, slowly and continuously widened \u201cleft bundle branch block like\u201d QRS patterns are mostly occur in left ventricular hypertrophy or in a metabolic\/infiltrative disease. Orv. 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