40 year female Known Diabetic presented with 5 days H/O Fever, Breathlessness (NYHA Class 4) Orthopnea , Abdominal distension, Swelling of feet. On examination patient had Tachypnea, tachycardia, with Bilateral Pitting Pedal edema and raised JVP. CVS Examination– S3+, Abdomen–free fluid and Tender Hepatomegaly. ECG showed Ischemic Changes (ST depression in V3–V6 with T wave inversion), and cardiac Biomarkers were normal, Suggestive of myocarditis. On Investigation it was found that Dengue NS1AG And IGM was Positive. 2DEcho–showed Global Hypokinesia(EF 40%). All of the changes in ECG and ECHO were returned to normal with control of failure. Clinical manifestations of cardiac complications varied considerably, from self–limiting tachy–brady arrhythmia to severe myocardial damage, leading to hypotension and pulmonary edema. To avoid otherwise preventable morbidity and mortality, physicians should have a high index of suspicion for cardiac complications in patients with dengue illness and should manage this accordingly