Difference between revisions of "Bundle Branch Block"

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(Created page with '*Abnormal ventricular excitation as the result of blockage to the right bundle branch, the left bundle branch, or left anterior fascicular block. ====Right Bundle Branch Block=…')
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*Abnormal ventricular excitation as the result of blockage to the right bundle branch, the left bundle branch, or left anterior fascicular block.
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== Introduction ==
 
  
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This condition is an '''abnormal ventricular excitation''' as the result of blockage to the right bundle branch, the left bundle branch, or left anterior fascicular block.
 
  
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'''Right bundle branch block''' is characterised by the failure or delay of conduction through the right bundle branch. The left ventricle is unaffected. Some causes of this condition include pulmonary [[embolism]], [[Dirofilaria immitis|heart worm]], [[:Category:Electrolytes|electrolyte]] disturbances, congenital diseases etc.
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====Right Bundle Branch Block====
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Characterised by the failure or delay of conduction through the right bundle branch. Left ventricle is unaffected.
  
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In '''left bundle branch block''', there is failure of conduction through the left bundle branch and the right ventricle is unaffected. Causes of this include congenital abnormalities and [[:Category:Myocardial Pathology|myocardial diseases]].
 
  
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There can also be a '''left anterior fasicular block''', which is characterised by the failure of conduction through the anterior fascicle of the left bundle branch. Causes of this include electrolyte abnormalities and [[:Category:Cardiomyopathy|cardiomyopathies]] e.g. in the cat.
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=====Causes=====
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Pulmonary embolism, heart worm, electrolyte disturbances, congenital diseases etc.
  
  
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== Signalment ==
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'''ECG Appearance:''' Wide QRS complex, Wide S wave
  
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The disease is described in both cats and dogs.
 
  
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=====Treatment=====
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Treat the underlying cause
  
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== Clinical Signs ==
 
  
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Many cases of bundle branch block are asymptomatic and are only detected on ECG. However, more severe cases will cause ventricular muscle damage and therefore signs of heart disease will occur. Some animals may present due to syncope, weakness or exercise intolerance.
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====Left Bundle Branch Block====
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Characterised by the failure of conduction through the left bundle branch. Right ventricle is unaffected.
  
  
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== Diagnosis ==
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=====Causes=====
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Congenital abnormalities, myocardial diseases etc.
  
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An '''Electrocardiograph''' (ECG) is the diagnostic method of choice.
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=====Treatment=====
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:In a right bundle branch block, one may see a '''wide QRS complex and a wide S wave'''.
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Treat the underlying cause
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:In left anterior fasicular block there will be a '''normal QRS wave, a tall R waves and deep S waves'''.
 
  
  
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== Treatment ==
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'''Left Anterior Fascicular Block'''=characterised by the failure of conduction through the anterior fascicle of the left bundle branch.
  
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Unless the condition is congenital, treatment is by treating the underlying cause.
 
  
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'''Causes:''' Electrolyte abnormalities, hypertrophic cardiomyopathy (cat), etc.
  
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== References ==
 
  
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Ettinger, S.J. and Feldman, E. C. (2000) Textbook of Veterinary Internal Medicine Diseases of the Dog and Cat Volume 2 (Fifth Edition), W.B. Saunders Company
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'''ECG Appearance:''' Normal QRS, tall R waves, deep S waves
  
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Ettinger, S.J, Feldman, E.C. (2005) Textbook of Veterinary Internal Medicine (6th edition, volume 2), W.B. Saunders Company
 
  
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Fossum, T. W. et. al. (2007) Small Animal Surgery (Third Edition), Mosby Elsevier
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'''Treatment:''' Treat the underlying cause[[Category:Impulse_Conduction_Abnormalities]][[Category:To_Do_-_Cardiovascular]]
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Merck & Co (2008) The Merck Veterinary Manual (Eighth Edition), Merial
 
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Nelson, R.W. and Couto, C.G. (2009) Small Animal Internal Medicine (Fourth Edition), Mosby Elsevier.
 
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{{review}}
 
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{{OpenPages}}
 
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[[Category:Impulse_Conduction_Abnormalities]] [[Category:Expert_Review]]
 
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[[Category:Cardiology Section]]
 

Revision as of 09:53, 2 July 2010

  • Abnormal ventricular excitation as the result of blockage to the right bundle branch, the left bundle branch, or left anterior fascicular block.


Right Bundle Branch Block

Characterised by the failure or delay of conduction through the right bundle branch. Left ventricle is unaffected.


Causes

Pulmonary embolism, heart worm, electrolyte disturbances, congenital diseases etc.


ECG Appearance: Wide QRS complex, Wide S wave


Treatment

Treat the underlying cause


Left Bundle Branch Block

Characterised by the failure of conduction through the left bundle branch. Right ventricle is unaffected.


Causes

Congenital abnormalities, myocardial diseases etc.

Treatment

Treat the underlying cause


Left Anterior Fascicular Block=characterised by the failure of conduction through the anterior fascicle of the left bundle branch.


Causes: Electrolyte abnormalities, hypertrophic cardiomyopathy (cat), etc.


ECG Appearance: Normal QRS, tall R waves, deep S waves


Treatment: Treat the underlying cause

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