Bundle branch block

Japanese: 脚ブロック - きゃくぶろっく

…The left and right bundle branches of the His bundle enter the ventricle as Purkinje fibers, but the left bundle branch is often thicker than the right bundle branch. Abnormalities in such conduction pathways are called blocks, and include atrioventricular block and bundle branch block. These occur due to degeneration of the conduction system cells (inflammation, impaired blood supply) or partial death of the cells. …

From [Electrocardiogram]

…The QRS complex indicates the ventricular excitation process and has a width of 0.06 to 0.10 seconds, but the waveform differs depending on the derivation method. If this width is extended (0.12 seconds or more), there may be an abnormality in the transmission of excitation within the ventricles (bundle branch block). The QRS wave height increases when the ventricular muscle is enlarged or the chest wall is thin. …

*Some of the terms that refer to "bundle branch block" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ヒス束の分岐した左右の脚はそれぞれプルキンエ繊維として心室に入るが，左脚は右脚より太いことが多い。　このような伝導路での異常はブロックblock(刺激伝導障害)と名づけられ，房室ブロック，脚ブロックなどがある。これらは刺激伝導系細胞の変性(炎症，血液供給障害)，あるいは細胞群の部分的死滅により発生する。…