left bundle branch block

List the diagnostic criteria for left bandle branch block:

  1. The specifically broadened R in 1, aVL, V5, and V6, which shows an M configuration, or the famous " broken-off sugar loaf";
  2. The upper transition point in v6 is located more than 55 ms away from the beginning of the R wave;
  3. In the chest wall leads, the latest negative motion of the R wave will be found in V5 or V6.

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