30-50%). Both atria are enlarged, sometimes massively. Modest left ventricular dilation can be present, usually with an end-diastolic dimension 60%Often decreasedLeft ventricular wall thicknessDecreasedNormal or increasedMarkedly increasedAtrial sizeIncreasedIncreased; may be massiveIncreased; related to abnormalValvularregurgitationRelated to annular dilation; mitral appears earlier, during decompensation; tricuspid regurgitation in late stagesRelated to endocardial involvement; frequent mitral and tricuspid regurgitation, rarely severeRelated to valve-septum interaction; mitral regurgitationCommon first symptomsExertional intoleranceExertional Intolerance, fluid retention earlyExertional intolerance; may have chest painCongestivesymptoms"Left before right, except right prominent in young adultsRight often dominatesLeft-sided congestion may develop lateArrhythmiaVentricular tachyarrhythmia; conduction block in Chagas' disease, and some families, j Atrial fibrillation.Ventricular uncommon except in sarcoidosis conduction block in sarcoidosis and amyloidosis. Atrial fibrillation.Ventriculartachyarrhythmias; atrial fibrillation">