A 40 years old female presented with acute onset shoness of breath. She has a history of nephrotic syndrome 1 year back and recent prolonged air travel. She has a BP of 90/60 mm Hg, hea rate of 115 per minute and sinus tachycardia on ECG. A 2-D echocardiogram revealed dilation of right ventricle with bulging of the interventricular septum to the left. What will be the primary treatment modality?