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AttributesValues
rdf:type
rdfs:label
  • Left Bundle Branch Block
rdfs:subClassOf
Concept_In_Subset
Semantic_Type
  • Finding
Preferred_Name
  • Left Bundle Branch Block
UMLS_CUI
  • C0023211
Contributing_Source
  • CDISC
ALT_DEFINITION
  • An impairment of transmission of the cardiac electrical impulse along the fibers of the left main bundle branch, or both the left anterior fascicle and left posterior fascicle. This conduction disturbance is characterized by wide (greater than 0.11s) QRS complexes. The diagnostic criteria consist of prolongation of the QRS complexes (over 0.11s) with neither a Q wave nor an S wave in lead V1 and in the properly placed V6. A wide R wave with a notch on its top (plateau) is seen in these leads. In hearts with an electrical (and anatomic) vertical position a small Q wave may be seen in AVL in the absence of MI. Right chest lead V1 may or may not show an initial R wave, but the latter should be present in lead V2. (NCI)CDISC
Legacy_Concept_Name
  • Left_Bundle_Branch_Block
FULL_SYN
  • Left Bundle Branch BlockPTNCI
  • LEFT BUNDLE BRANCH BLOCKPTCDISC
  • Left bundle branch blockSYCDISC
  • LBBBSYNCI
DEFINITION
  • An electrocardiographic finding of a QRS duration of 120 ms or longer, delayed onset of intrinsicoid deflection in 1, V5, and V6 that is greater than 60 ms, broad and notched or slurred R waves in I, aVL, V5, and V6, rS or QS complexes in right precordial leads, ST-segment and T waves in opposite polarity to the major QRS deflection.NCI
code
  • C62269
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