30-50%).-Seen in Amyloidosis, sarcoidosis, hemochromatosis etc.,-Ventricles become rigid & lack the flexibility to expand during diastole.-SOB, fatigue, palpitations & syncope.-Other Common Findings: Atrial fibrilation, conduction delays.-ECG shows Low voltage, non-specific ST-T wave abnormalities & various arrhythmias.[?]Brugada byndrome:-ECG shows >0.2mV of ST-segment elevation with coved ST segment & negative T wave in more than one anterior precordial lead (V1 -V3 ) and episodes of syncope or cardiac arrest due to polymorphic VT in the absence of structural heart disease.-Cardiac arrest may occur during sleep or be provoked by febrile illness.-Males are more commonly affected than females.-Quinidine used successfully to suppress frequent episodes of VT[?]Pericardial Effusion:oClassical triad of findings for pericardial effusionowith cardiac tamponade:-Sinus tachycardia,-Low QRS voltage,-Electrical alternans (Best seen in V3 & V4 )">