Dilated cardiomyopathy is the most common type of cardiomyopathy and is characterized by left ventricular dilation and systolic dysfunction. Causes include genetic factors in 20-50% of cases as well as myocarditis, alcohol toxicity, and peripartum cardiomyopathy. Hypertrophic cardiomyopathy is caused by mutations in sarcomeric genes and is characterized by asymmetric hypertrophy of the ventricular septum. Restrictive cardiomyopathy results in stiff ventricles with impaired diastolic filling and is associated with conditions causing fibrosis like radiation, amyloidosis, and sarcoidosis. The main types of cardiomyopathy are dilated, hypertrophic, restrictive, and arrhythmogenic right ventricular cardiomyopathy.

1. PRESENTED BY-DR. BISWAJEETA SAHA, DEPT OF PATHOLOGY
KIMS,BBSR

2. Introduction
 2006 AHA defined cardiomyopathies as “a heterogeneous group of
diseases of the myocardium associated with mechanical &/or electrical
dysfunction that usually (but not invariably) exhibit inappropriate
ventricular hypertrophy or dilatation and are due to a variety of causes
that frequently are genetic.”
 Cardiomyopathies either are confined to the heart or are a part of
generalized systemic disorders

3. Functional classification
 Dilated cardiomyopathy
 Hypertrophic cardiomyopathy
 Restrictive cardiomyopathy
 Arrhthymogenic Right Ventricular disease(ARVD)

4. DILATED
CARDIOMYOPATHY

5. Definition
 Primary (idiopathic) is a disease of unknown etiology that principally
affects the myocardium leading to LV dilation and systolic dysfunction
 Most common of the cardiomyopathies

6. Causes
 Genetic influences-
 20-50% are familial
 Autosomal dominant –predominant pattern
 Mutations in genes encoding dystrophin,δ sarcoglycan,troponin T,β
MHC etc
 Myocarditis
 Alcohol and other toxins
 Childbirth (peripartum cardiomyopathy)

9. Morphology
 Heart enlarged,heavy,flabby
 Mural thrombi common
 Dilatation of all chambers,both ventricular hypertrophy
 Microscopically-atrophic and hypertrophic myocardial fibres,cardiac
myocytes show degenerative changes
 Interstitial and endocardial fibrosis

10. Clinical features-
 Highest incidence in middle age
 Symptoms may be gradual in onset
 Acute presentation
 Misdiagnosed as viral URI in young adults
 Symptoms/Signs of heart failure
 Pulmonary congestion (left heart failure)
dyspnea (rest, exertional, nocturnal), orthopnea
 Systemic congestion (right heart failure)
edema, nausea, abdominal pain, nocturia
 Low cardiac output
 Hypotension, tachycardia, tachypnea
 Fatigue and weakness
 Arrhythmia
 Atrial fibrillation, conduction delays,,sudden death

12. DCM - Incidence and Prognosis
 Prevalence is 36 per 100,000 population
 Third most common cause of heart failure
 Most frequent cause of heart transplantation
 Complete recovery is rare
 50% die within 2yrs and 25% survive longer than 5yrs

13. HYPERTOPHIC
CARDIOMYOPATHY

14. Hypertrophic cardiomyopathy
 Characterised by myocardial hypertrophy,abnormal diastolic
filling,intermittent ventricular outflow obstruction
 Related to defects in force generation owing to altered sarcomeric
function
 Leading cause of LVH,unexplained by other clinical/pathologic cause
 Caused by mutation of genes encoding sarcomeric proteins

15. Pathogenesis
 Autosomal dominant with variable penetrance
 Remaining are sporadic
 Mutations are mostly missense
 Mutations causing HCM found in genes encoding β MHC,cardiac
TnT,α tropomyosin,myosin binding protein C

16.  The major abnormality of the heart
in HCM -- excessive thickening of
the muscle. Thickening usually
begins during early adolescence and
stops when growth has finished.
uncommon for thickening to
progress after this age
 left ventricle almost always affected
 Hypertrophy is usually greatest in
the septum, associated with
obstruction to the flow of blood into
the aorta

17.  Asymmetric septal
hypertrophy with obstruction
to the outflow of blood from
the heart may occur. The mitral
valve touches the septum,
blocking the outflow tract.
Some blood is leaking back
through the mitral valve
causing mitral regurgitation

18. Histologic features
 Extensive myocyte
hypertrophy
 Myofiber disarray
 Interstitial and
replacement
fibrosis

19. Pathophysiology
 Impaired diastolic filling-----reduced stroke volume
 Reduced CO and increase in pulm venous pressure---exertional
dyspneoa
 Diastolic dysfunction
 Impaired diastolic filling, filling pressure
 Myocardial ischemia
 Mitral regurgitation
 Arrhythmias

20. Clinical features
 Asymptomatic
 Echocardiographic finding only
 Symptomatic
 Dyspnea in 90%
 Harsh systolic ejection murmur
 Angina pectoris in 75%
 Fatigue, pre-syncope, syncope, risk of SCD
 Palpitation, PND, CHF, dizziness
 Atrial fibrillation, thromboembolism

21. RESTRICTIVE
CARDIOMYOPATHY

22. Restrictive cardiomyopathy
 Hallmark: abnormal diastolic function
 Rigid ventricular wall with impaired ventricular filling ,contractile
functions are normal
 Much less common then DCM or HCM
 Characterised by primary disease in ventricular compliance resulting in
impaired ventricular filing during diastole

23. CAUSES
 Primary---idiopathic
 Associated with –
 Radiation fibrosis
 Amyloidosis
 Sarcoidosis
 Metastatic tumors
 Metabolic deposition diseases

24. Morphology
 Ventricles are of normal size
 Cavities are not dilated
 Myocardium is firm and non compliant
 Biatrial dilatation is common
 Patchy/diffuse interstitial fibrosis

25. Clinical manifestations
• Symptoms of right and left heart failure
• Echo-Doppler
– Abnormal mitral inflow pattern
-Prominent E wave (rapid diastolic filling)
 Almost invariably progresses to congestive heart failure,10% survive
for 10 yrs

26. Amyloidosis
 Cardiac enlargement without
ventricular dilatation
 Ventricular walls are thickened
and rubbery
 Amyloid deposition is most
prominent in
interstitial,perivascular and
endocardial regions

27. Endomyocardial diseases
 Endomyocardial fibrosis  Loefflers endomyocarditis

28. hemochromatosis
sarcoidosis

29. Fabrys disease
Pompes disease

30. Arrythmogenic right ventricular
cardiomyopathy
 Inherited disease of cardiac muscle
 RVF,rhytm disturbances,ventricular tachycardia,fibrillation
 Rt ventricular wall is thinned,extensive fatty infiltration and fibrosis
 Autosomal dominant inheritence

31. THANK YOU