Muscle is stiff from fibrosis or infiltrating process (e.g. amyloidosis, hemochromatosis)
Form of diastolic dysfunction (difficulty filling); ventricular endocardial thickening or myocardial infiltration-->high filling pressures, impaired diastolic filling-->mitral and/or tricuspid regurgitation--> venous pulmonary hypertension
Ventricular EF typically normal, though systolic function may deteriorate in absence of compensatory hypertrophy
If nodal/conduction tissues affected by infiltrative/fibrotic process, may cause SA or AV block
Must distinguish from constrictive pericarditis
Ventricular EF typically normal, though systolic function may deteriorate in absence of compensatory hypertrophy
Restrictive cardiomyopathy
Dilated cardiomyopathy
Hypertrophic cardiomyopathy
Acute rheumatic fever
Peripartum cardiomyopathy
Amyloidosis
Takotsubo cardiomyopathy
Constrictive pericarditis