Category:Impulse Conduction Abnormalities - Revision history

Bara at 18:53, 15 February 2011

2011-02-15T18:53:45Z

Bara at 09:55, 2 July 2010

2010-07-02T09:55:43Z

Bara at 09:55, 2 July 2010

2010-07-02T09:55:12Z

Bara at 09:53, 2 July 2010

2010-07-02T09:53:59Z

Bara at 09:53, 2 July 2010

2010-07-02T09:53:03Z

Bara at 09:52, 2 July 2010

2010-07-02T09:52:16Z

Bara at 09:51, 2 July 2010

2010-07-02T09:51:28Z

Bara at 09:50, 2 July 2010

2010-07-02T09:50:25Z

Bara: Created page with '===1. SA Block=== The delay (sinus block) or failure (sinus arrest) of the sinoatrial node to conduct impulses. SA Block=when an impulse does not leave the SA node *SA Arres…'

2010-07-02T09:38:12Z

Created page with '===1. SA Block=== *The delay (sinus block) or failure (sinus arrest) of the sinoatrial node to conduct impulses. *SA Block=when an impulse does not leave the SA node *SA Arres…'

New page

===1. SA Block===

*The delay (sinus block) or failure (sinus arrest) of the sinoatrial node to conduct impulses.

*SA Block=when an impulse does not leave the SA node

*SA Arrest=momentary failure in the SA node to start an impulse causes a pause in the normal cardiac cycle

====Causes====
Sick sinus syndrome, electrolyte imbalances, atrial diseases, hypothyroidism etc.

'''ECG Appearance:''' Absence of P-QRS-T complexes for a brief period of time

-Sinus block=no P-QRS-T complexes for twice the R-R interval

-Sinus arrest=no P-QRS-T complexes for greater than two R-R intervals

====Treatment====
Treat the underlying causes; atropine etc., surgical implantation of a pacemaker

===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

===Atrial Standstill===

*Temporary or permanent lack of atrial activity resulting from a failure of atrial depolarisation. Ventricles still function normally.

====Causes====
Electrolyte abnormalities, cardiomyopathies, muscular dystrophy, hypoadrenocorticism

'''ECG Appearance:''' Absence of P waves

====Treatment====
Treat the underlying cause

===Bundle Branch Block===

*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

===Wolff-Parkinson-White Syndrome (Ventricular Preexcitation Syndrome===

*This syndrome occurs when the conduction travels from the SA node and then completely bypasses the AV
node and travels to the bundle of His or the ventricles.

====Causes====
Hypertrophic cardiomyopathy (cats); congenital heart disorders

'''ECG Appearance:''' Short PR interval; Prolonged QRS complex; Notch in the R wave

====Treatment====
Treatment for tachycardia if necessary: digoxin, quinidine etc.

===Sick Sinus Syndrome===

*This is a blanket term used to describe multiple abnormalities of the SA node involving impulse formation and conduction disturbances.

====Causes====
Myocardial diseases, idiopathic, breed predispositions (e.g. miniature schnauzer)

'''ECG:''' Variable depending on the specific SA abnormality

====Treatment====
Surgical implantation of a pacemaker; +/- antiarrhythmic treatments[[Category:Altered_Impulse_Formations]]

@@ Line 7: / Line 7: @@
 </b></big>
-|logo =
+|logo =Heart logo.jpg
 }}

← Older revision		Revision as of 09:55, 2 July 2010
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−	~~[[Sino-Atrial Block]]~~
−
−	~~[[Atrio-Ventricular Block]]~~
−
−
−
−
−	~~===[[Atrial Standstill]]===~~
−
−
−
−	~~===[[Bundle Branch Block]]===~~
−
−	~~[[Ventricular Preexcitation Syndrome]]~~
−
−
−	~~===[[Sick Sinus Syndrome]]===~~

	[[Category:Altered_Impulse_Formations]]		[[Category:Altered_Impulse_Formations]]

← Older revision		Revision as of 09:55, 2 July 2010
Line 28:		Line 28:


−	===Sick Sinus Syndrome===	+	===[[Sick Sinus Syndrome]]===

−	*This is a blanket term used to describe multiple abnormalities of the SA node involving impulse formation and conduction disturbances.	+	[[Category:Altered_Impulse_Formations]]
−
−
−	~~====Causes====~~
−	~~Myocardial diseases, idiopathic, breed predispositions (e.g. miniature schnauzer)~~
−
−
−	~~'''ECG:''' Variable depending on the specific SA abnormality~~
−
−
−	~~====Treatment====~~
−	~~Surgical implantation of a pacemaker; +/- antiarrhythmic treatments~~[[Category:Altered_Impulse_Formations]]

← Older revision		Revision as of 09:53, 2 July 2010
Line 25:		Line 25:
	===[[Bundle Branch Block]]===		===[[Bundle Branch Block]]===

		+	[[Ventricular Preexcitation Syndrome]]

−
−	~~===Wolff-Parkinson-White Syndrome (Ventricular Preexcitation Syndrome===~~
−
−	*This syndrome occurs when the conduction travels from the SA node and then completely bypasses the AV
−	~~node and travels to the bundle of His or the ventricles.~~
−
−
−	~~====Causes====~~
−	~~Hypertrophic cardiomyopathy (cats); congenital heart disorders~~
−
−
−	~~'''ECG Appearance:''' Short PR interval; Prolonged QRS complex; Notch in the R wave~~
−
−
−	~~====Treatment====~~
−	~~Treatment for tachycardia if necessary: digoxin, quinidine etc.~~

	===Sick Sinus Syndrome===		===Sick Sinus Syndrome===

← Older revision		Revision as of 09:53, 2 July 2010
Line 23:		Line 23:


−	===Bundle Branch Block===	+	===[[Bundle Branch Block]]===

−	*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~~

	===Wolff-Parkinson-White Syndrome (Ventricular Preexcitation Syndrome===		===Wolff-Parkinson-White Syndrome (Ventricular Preexcitation Syndrome===

← Older revision		Revision as of 09:52, 2 July 2010
Line 19:		Line 19:


−	===Atrial Standstill===	+	===[[Atrial Standstill]]===

−	*Temporary or permanent lack of atrial activity resulting from a failure of atrial depolarisation. Ventricles still function normally.

−
−	~~====Causes====~~
−	~~Electrolyte abnormalities, cardiomyopathies, muscular dystrophy, hypoadrenocorticism~~
−
−
−	~~'''ECG Appearance:''' Absence of P waves~~
−
−
−	~~====Treatment====~~
−	~~Treat the underlying cause~~

	===Bundle Branch Block===		===Bundle Branch Block===

← Older revision		Revision as of 09:51, 2 July 2010
Line 14:		Line 14:
	[[Sino-Atrial Block]]		[[Sino-Atrial Block]]

		+	[[Atrio-Ventricular Block]]


−	~~===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~~

	===Atrial Standstill===		===Atrial Standstill===

@@ Line 1: / Line 1: @@
-===1. SA Block===
+{{frontpage
-*The delay (sinus block) or failure (sinus arrest) of the sinoatrial node to conduct impulses.
+</b></big>
 ===2. AV Block===

Category:Impulse Conduction Abnormalities - Revision history

Bara at 18:53, 15 February 2011

Bara at 09:55, 2 July 2010

Bara at 09:55, 2 July 2010

Bara at 09:53, 2 July 2010

Bara at 09:53, 2 July 2010

Bara at 09:52, 2 July 2010

Bara at 09:51, 2 July 2010

Bara at 09:50, 2 July 2010

Bara: Created page with '===1. SA Block=== *The delay (sinus block) or failure (sinus arrest) of the sinoatrial node to conduct impulses. *SA Block=when an impulse does not leave the SA node *SA Arres…'

Bara: Created page with '===1. SA Block=== The delay (sinus block) or failure (sinus arrest) of the sinoatrial node to conduct impulses. SA Block=when an impulse does not leave the SA node *SA Arres…'