A 42-year-old male patient with essential hypertension presents with headache, palpitations, unexplained fear. Objectively: Ps-100/min, AP- 200/100 mm Hg, the left border of cardiac dullness is displaced by 1,5 cm to the left, vesicular breathing is present. ECG shows sinus tachycardia, signs of left ventricular hypertrophy. What drug should be administered as an emergency?