Atrio-Ventricular Block - Revision history

Bara: /* References */

2013-10-15T14:33:18Z

References

Bara at 16:22, 5 July 2012

2012-07-05T16:22:33Z

Bara at 18:31, 20 March 2011

2011-03-20T18:31:56Z

Kthompson at 11:29, 14 March 2011

2011-03-14T11:29:48Z

Bara: Text replace - "[[Lyme disease" to "[[Lyme Disease"

2010-12-16T22:32:54Z

Text replace - "[[Lyme disease" to "[[Lyme Disease"

JamesSwann: /* 3rd Degree (Total AV Block) */

2010-07-23T16:23:15Z

3rd Degree (Total AV Block)

Bara: 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 '''…'

2010-07-02T09:51:51Z

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 '''…'

New page

===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]]

← Older revision		Revision as of 14:33, 15 October 2013
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	[[Category:Impulse_Conduction_Abnormalities]] [[Category:Expert_Review]]		[[Category:Impulse_Conduction_Abnormalities]] [[Category:Expert_Review]]
		+	[[Category:Cardiology Section]]

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-{{review}}
+{{OpenPagesTop}}
 == Introduction ==
@@ Line 50: / Line 50: @@
 [[Category:Impulse_Conduction_Abnormalities]] [[Category:Expert_Review]]

@@ Line 1: / Line 1: @@
-== Introduction<br> ==
+{{review}}
-Atrio-ventricular block is the delay or failure of the atrioventricular node to conduct impulses.&nbsp;
+Atrio-ventricular block is the delay or failure of the atrioventricular node to conduct impulses.
-There are three types of AV block:<br>
+There are three types of AV block:
-st Degree (Partial AV Block) - Delayed conduction through the AV node. Causes include electrolyte imbalance, drug reactions and degenerative changes in the AV node. It may be a permanent or temporary condition.<br>
+'''1st Degree''' (Partial AV Block) - Delayed conduction through the AV node. Causes include electrolyte imbalance, drug reactions and degenerative changes in the AV node. It may be a permanent or temporary condition.
-nd Degree (Partial AV Block) - Intermittent failure of conduction through the AV node. Mobitz Type I.= prolonged P-R interval and Mobitz Type II.= no prolongation of the P-R interval. There are also sub types with Type A: normal QRS length; block is above the bundle of His division (Most commonly seen with Mobitz Type I.) and Type B: longer QRS length; block is below the bundle of His division (Most commonly seen with Mobitz Type II.). Causes include electrolyte imbalance, drug reactions and degenerative changes in the AV node . The condition may be temporary or permanent. <br>
+'''2nd Degree''' (Partial AV Block) - Intermittent failure of conduction through the AV node.
-rd Degree (Total AV Block) - Total failure of AV conduction causing uncoordinated and independent atrial and ventricular depolarisations. Causes include electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, Lyme Disease etc. This is a permanent life threatening condition.<br>
+:There are also sub types with Type A: normal QRS length; block is above the bundle of His division (Most commonly seen with Mobitz Type I.)
-<br>
+:Causes include electrolyte imbalance, drug reactions and degenerative changes in the AV node. The condition may be temporary or permanent.
-== Clinical Signs<br> ==
+'''3rd Degree''' (Total AV Block) - Total failure of AV conduction causing uncoordinated and independent atrial and ventricular depolarisations. Causes include electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, [[:Category:Cardiomyopathy|cardiomyopathies]], [[hypothyroidism]], [[endocarditis]], [[Lyme Disease]] etc. This is a permanent life threatening condition.
-<br>
+== Clinical Signs ==
-== Diagnosis<br> ==
+Depending on which type of block and severity, clinical signs may vary. Signs may include weakness, syncope, exercise intolerance and pallor.
-An ECG will show characteristic results which will confirm the diagnosis. In 1st degree AV block there will be a longer P-R interval on ECG.On 2nd degree AV block some P waves are not followed by QRS complexes. In 3rd degree AV block there will be independent regular and fast P waves or independent regular and slow QRS waves. <br>
+== Diagnosis ==
-<br>
+Clinical signs plus auscultation of the heart will be indicative of the condition.
-== Treatment and Control<br> ==
+An '''ECG''' will show characteristic results which will confirm the diagnosis. In 1st degree AV block there will be a longer P-R interval on ECG. In 2nd degree AV block some P waves are not followed by QRS complexes. In 3rd degree AV block there will be independent regular and fast P waves or independent regular and slow QRS waves.
-nd degree Av block- Mobitz Type I.: Treat underlying cause if necessary,&nbsp;Mobitz Type II. Treat with atropine etc. or surgical implantation of a pacemaker.
+== Treatment and Control ==
-rd degree AV block needs surigical intervention and the implantation of a cardiac pacemaker. <br>
+st degree AV block - treat the underlying cause.
-<br>
+nd degree Av block - Mobitz Type I.: Treat underlying cause if necessary. Mobitz Type II. Treat with atropine etc. or surgical implantation of a pacemaker.
-== References<br> ==
+rd degree AV block needs surgical intervention and the implantation of a cardiac pacemaker.
-[[Category:Impulse_Conduction_Abnormalities]] [[Category:To_Do_-_Review]]
+Ettinger, S.J, Feldman, E.C. (2005) Textbook of Veterinary Internal Medicine (6th edition, volume 2)W.B. Saunders Company

← Older revision		Revision as of 22:32, 16 December 2010
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−	'''Causes''' Electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, [[Lyme ~~disease~~]] etc.	+	'''Causes''' Electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, [[Lyme Disease]] etc.

← Older revision		Revision as of 16:23, 23 July 2010
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−	'''Causes''' Electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, ~~lymes~~ disease etc.	+	'''Causes''' Electrolyte disturbances, drug toxicities (e.g. digitalis), acquired nodal diseases, cardiomyopathies, hypothyroidism, endocarditis, [[Lyme disease]] etc.

@@ Line 1: / Line 1: @@
-===2. AV Block===
+== Introduction<br> ==
-*The delay or failure of the atrioventricular node to conduct impulses.
+Atrio-ventricular block is the delay or failure of the atrioventricular node to conduct impulses.&nbsp;
-====1st Degree (Partial AV Block)====
+st Degree (Partial AV Block) - Delayed conduction through the AV node. Causes include electrolyte imbalance, drug reactions and degenerative changes in the AV node. It may be a permanent or temporary condition.<br>
-*Delayed conduction through the AV node
+nd Degree (Partial AV Block) - Intermittent failure of conduction through the AV node. Mobitz Type I.= prolonged P-R interval and Mobitz Type II.= no prolongation of the P-R interval. There are also sub types with Type A: normal QRS length; block is above the bundle of His division (Most commonly seen with Mobitz Type I.) and Type B: longer QRS length; block is below the bundle of His division (Most commonly seen with Mobitz Type II.). Causes include electrolyte imbalance, drug reactions and degenerative changes in the AV node . The condition may be temporary or permanent. <br>
-'''Causes'''
+<br>
-'''ECG Appearance:''' Longer P-R interval
+Depending on which type of block and severity, clinical signs may vary. Signs may include weakness, syncope, exercise intolerance and pallor.<br>
-'''Treatment''' Treat the underlying cause
+== Diagnosis<br> ==
-====2nd Degree (Partial AV Block)====
+Clinical signs plus auscultation of the heart will be indicative of the condition. <br>
-*Intermittent failure of conduction through the AV node
+An ECG will show characteristic results which will confirm the diagnosis. In 1st degree AV block there will be a longer P-R interval on ECG.On 2nd degree AV block some P waves are not followed by QRS complexes. In 3rd degree AV block there will be independent regular and fast P waves or independent regular and slow QRS waves. <br>
-'''Mobitz Type I.'''= prolonged P-R interval
+== Treatment and Control<br> ==
-'''Mobitz Type II.'''= no prolongation of the P-R interval
+nd degree Av block- Mobitz Type I.: Treat underlying cause if necessary,&nbsp;Mobitz Type II. Treat with atropine etc. or surgical implantation of a pacemaker.
-'''Type A:''' normal QRS length; block is above the bundle of His division (Most commonly seen with Mobitz Type I.)
+<br>
-'''Type B:''' longer QRS length; block is below the bundle of His division (Most commonly seen with Mobitz Type II.)
+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<br>Ettinger, S.J, Feldman, E.C. (2005) Textbook of Veterinary Internal Medicine (6th edition, volume 2)W.B. Saunders Company<br>Fossum, T. W. et. al. (2007) Small Animal Surgery (Third Edition) Mosby Elsevier <br>
+[[Category:Impulse_Conduction_Abnormalities]] [[Category:To_Do_-_Review]]