Difference between revisions of "Hypertrophic Cardiomyopathy"

Revision as of 10:58, 6 October 2008

CARDIOLOGY ()Map CARDIOVASCULAR CONDITIONS (Map)

Rare in dogs

Common in cats

Hypertrophic cardiomyopathy (cat). Courtesy of T. Scase

Signalment

Dogs: Rare

Cats: Pedigrees (e.g. Persians, Maine Coons) & mixed breeds; Occurs in young pedigrees and young to old mixed breeds; Male>Female

Description

Left ventricular concentric hypertrophy without an identifiable cause is known as hypertrophic cardiomyopathy. The ventricular myocardium becomes so thick that the lumen is reduced to a size that is not compatible with maintaining the heart's function as a pump. The left ventricle no longer has the capacity to hold normal volumes of blood during diastole. As a result, the left atrium dilates from the increased pressure and volume of blood backing up into the lungs.

Diagnosis

History & Clinical Signs

-Asymptomatic

-Hindlimb paresis or weakness (saddle thrombus see in cats)

-Signs of left-sided heart failure

Physical Exam:

-Systolic murmur

-Ventricular arrhythmias

Radiography=

-Left atrial enlargement

-Enlarged heart

-Pulmonary congestion & edema

Electrocardiography (ECG)=

-Tall R wave

-Wide QRS

-Ventricular arrhythmias

-Conduction disturbances

-Sinus tachycardia

Echocardiography

-Left ventricular concentric hypertrophy

-Left atrial enlargement

-Mitral valve insufficiency

Treatment

-Treat the individual symptoms

Contraindications: Arterial Vasodilators; Positive Inotrops

Prognosis

-Poor for symptomatic cats

@@ Line 1: / Line 1: @@
-{{OpenPagesTop}}
+{{review}}
-== Introduction  ==
+{{toplink
+|backcolour =
+|linkpage =Cardiology - WikiClinical
+|linktext =Cardiology
+|sublink1=Cardiovascular Conditions - WikiClinical
+|subtext1=CARDIOVASCULAR CONDITIONS
+|maplink1= Cardiovascular Conditions (Content Map) - WikiClinical
+|pagetype=Clinical
+}}
+<br>
+[[Image:cat-logo.png|right|40px]]
+[[Image:dog-logo.png|right|40px]]
+*Rare in dogs
-Left ventricular '''concentric hypertrophy''' without an identifiable cause is known as hypertrophic cardiomyopathy. The ventricular myocardium becomes so thick that the lumen is reduced to a size that is not compatible with maintaining the heart's function as a pump. The left ventricle no longer has the capacity to hold normal volumes of blood during diastole. As a result, the left atrium dilates from the increased pressure and volume of blood backing up into the lungs.
+*Common in cats
+[[Image:hypertrophic cardiomyopathy.jpg|right|thumb|125px|<small><center>'''Hypertrophic cardiomyopathy (cat)'''. Courtesy of T. Scase</center></small>]]
+[[Image:hypertrophic cardiomyopathy 2.jpg|right|thumb|125px|<small><center>'''Hypertrophic cardiomyopathy (cat)'''. Courtesy of T. Scase</center></small>]]
+===Signalment===
-==Signalment==
+Dogs: Rare
-This heart disease is rare in dogs but is the '''most common cardiac disease in cats'''. It more frequently occurs in Persians and Siamese breeds of cat. It is thought to be inherited in Maine Coon cats.
-<br>
+Cats: Pedigrees (e.g. Persians, Maine Coons) & mixed breeds; Occurs in young pedigrees and young to old mixed breeds; Male>Female
+===Description===
+*Left ventricular concentric hypertrophy without an identifiable cause is known as hypertrophic cardiomyopathy.  The ventricular myocardium becomes so thick that the lumen is reduced to a size that is not compatible with maintaining the heart's function as a pump.  The left ventricle no longer has the capacity to hold normal volumes of blood during diastole.  As a result, the left atrium dilates from the increased pressure and volume of blood backing up into the lungs.
+===Diagnosis===
+====History & Clinical Signs====
+-Asymptomatic
+-Hindlimb paresis or weakness (saddle thrombus see in cats)
+-Signs of left-sided heart failure
+====Physical Exam:====
-== Clinical Signs ==
+-Systolic murmur
-The disease can often be present without clinical signs (asymptomatic).
+-Ventricular arrhythmias
-There may be hindlimb paresis or weakness, if saddle [[Thrombosis|thrombus]] (cats) occurs due to this disease.
-There will usually be signs of [[Heart Failure, Left-Sided|left-sided heart failure]]. Tachycardia, [[:Category:Arrhythmia|arrhythmias]] and dyspnoea can also be seen.
+===Radiography====
-<br>
-== Diagnosis ==
+-Left atrial enlargement
-Physical examination and auscultation will reveal a systolic murmur and ventricular arrhythmias.
+-Enlarged heart
-Radiography of the thorax will show a degree of left atrial enlargement, a generally enlarged heart and pulmonary congestion & edema.
+-Pulmonary congestion & edema
-On Electrocardiography (ECG), there will often be presence of a '''tall R wave and a wide QRS complex'''. Ventricular arrhythmias, conduction disturbances and sinus tachycardia may also be seen.
-Upon Echocardiography, left ventricular concentric hypertrophy, left atrial enlargement and mitral valve insufficiency are commonly seen with this condition. The chamber size will appear dramatically reduced.
+===Electrocardiography (ECG)====
+-Tall R wave
-== Treatment ==
+-Wide QRS
-It is necessary to treat the individual symptoms, as there is no treatment for the condition.
+-Ventricular arrhythmias
-Drugs with contraindications include arterial vasodilators and positive inotropes.
+-Conduction disturbances
+-Sinus tachycardia
-== Prognosis ==
-Poor for symptomatic cats.
+====Echocardiography====
+-Left ventricular concentric hypertrophy
-{{Learning
+-Left atrial enlargement
-|Vetstream = [https://www.vetstream.com/canis/Content/Disease/dis00924.asp, Hypertrophic cardiomyopathy]
-|flashcards = [[Myocardial Pathology Flashcards]]
-}}
-== References ==
+-Mitral valve insufficiency
-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''
-Ettinger, S.J, Feldman, E.C. (2005) '''Textbook of Veterinary Internal Medicine''' (6th edition, volume 2) ''W.B. Saunders Company''
+===Treatment===
-Fossum, T. W. et. al. (2007) '''Small Animal Surgery '''(Third Edition) ''Mosby Elsevier ''
+-Treat the individual symptoms
+Contraindications: Arterial Vasodilators; Positive Inotrops
-{{review}}
-{{OpenPages}}
+===Prognosis===
-[[Category:Cardiomyopathy]] [[Category:Cardiac Diseases - Cat]][[Category:Cardiac Diseases - Dog]]
+-Poor for symptomatic cats
-[[Category:Expert_Review]]
-[[Category:Cardiology Section]]