A 18 y.o. female student complains of dyspnea during the intensive exertion. The condition became worse half a year ago. On examination: pulse rate is 88 bpm, accelerated, AP-180/20 mm Hg, pale skin, heart borders are dilated to the left and up. There is systolic-diastolic murmur in the 2hd intercostal space, S2 at pulmonary artery is accentuated. ECG has revealed both ventricles hypertrophy. Thoracic X-ray has revealed pulsation and protrusion of the left ventricle, lung trunk. What doctor's tactics should be?