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Created page with '===2. AV Block=== *The delay or failure of the atrioventricular node to conduct impulses. ====1st Degree (Partial AV Block)==== *Delayed conduction through the AV node '''…'
===2. AV Block===
*The delay or failure of the atrioventricular node to conduct impulses.
====1st Degree (Partial AV Block)====
*Delayed conduction through the AV node
'''Causes'''
Electrolyte imbalance, drug reactions, degenerative changes in the AV node
'''ECG Appearance:''' Longer P-R interval
'''Treatment''' Treat the underlying cause
====2nd Degree (Partial AV Block)====
*Intermittent failure of conduction through the AV node
'''Mobitz Type I.'''= prolonged P-R interval
'''Mobitz Type II.'''= no prolongation of the P-R interval
'''Type A:''' normal QRS length; block is above the bundle of His division (Most commonly seen with Mobitz Type I.)
'''Type B:''' longer QRS length; block is below the bundle of His division (Most commonly seen with Mobitz Type II.)
'''Causes''' Electrolyte imbalance, drug reactions, degenerative changes in the AV node
'''ECG Appearance:''' Some P waves are not followed by QRS complexes
'''Treatment'''
Mobitz Type I.: Treat underlying cause if necessary
Mobitz Type II. Treat with atropine etc. or surgical implantation of a pacemaker
====3rd Degree (Total AV Block)====
*Total failure of AV conduction causing uncoordinated and independent atrial and ventricular depolarisations
'''Causes''' Electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, lymes disease etc.
'''ECG Appearance:''' Independent regular and fast P waves; independent regular and slow QRS waves
'''Treatment''' Treat underlying disease, atropine etc., implantation of a cardiac pacemaker[[Category:Impulse_Conduction_Abnormalities]][[Category:To_Do_-_Cardiovascular]]
*The delay or failure of the atrioventricular node to conduct impulses.
====1st Degree (Partial AV Block)====
*Delayed conduction through the AV node
'''Causes'''
Electrolyte imbalance, drug reactions, degenerative changes in the AV node
'''ECG Appearance:''' Longer P-R interval
'''Treatment''' Treat the underlying cause
====2nd Degree (Partial AV Block)====
*Intermittent failure of conduction through the AV node
'''Mobitz Type I.'''= prolonged P-R interval
'''Mobitz Type II.'''= no prolongation of the P-R interval
'''Type A:''' normal QRS length; block is above the bundle of His division (Most commonly seen with Mobitz Type I.)
'''Type B:''' longer QRS length; block is below the bundle of His division (Most commonly seen with Mobitz Type II.)
'''Causes''' Electrolyte imbalance, drug reactions, degenerative changes in the AV node
'''ECG Appearance:''' Some P waves are not followed by QRS complexes
'''Treatment'''
Mobitz Type I.: Treat underlying cause if necessary
Mobitz Type II. Treat with atropine etc. or surgical implantation of a pacemaker
====3rd Degree (Total AV Block)====
*Total failure of AV conduction causing uncoordinated and independent atrial and ventricular depolarisations
'''Causes''' Electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, lymes disease etc.
'''ECG Appearance:''' Independent regular and fast P waves; independent regular and slow QRS waves
'''Treatment''' Treat underlying disease, atropine etc., implantation of a cardiac pacemaker[[Category:Impulse_Conduction_Abnormalities]][[Category:To_Do_-_Cardiovascular]]