Key Factors Dilated Cardiomyopathy
90% of all non-ischemic caridiomyopathies
non-ischemic: chronic alcoholism (most common cause)
Others Can be idiopathic or from viral myocarditis
(Coxsackie virus most common)
All four chambers dialated
Flabby, hypocontracting heart :(
Hypertrophic Cardiomyopathy
Key points
Myocardial hypertrophy; Thick walled, heavy, hyper-contracting:
Often only 1 ventricle
NO ventricular dilation: Thick Vent. septum
Abnormal diastole filling (1/3 cases)
intermittent ventricular outflow obstruction
Gentetic mutation of genes that encode sarcomere
proteins
Idiopathic hypertrophic sub-aortic stenosis
Restrictive Cardiomyopathy
Intfiltratrated myocardium with abnormal tissue:
impaired vent. wall motion/abnormal contraction
amyloidosis
hemochromatosis
Infectious endocarditis
Key points
Valve leaflets!!! (sometimes endocarial lining)
Atrial surface AV valves; Vent. surface semi lunar
Vegetations most common on left valves
Easy embolism
