A patient presents with tearing chest pain radiating to the back. BP is 198/110 mm Hg, HR 108/min; CXR shows mediastinal widening; CTA confirms Stanford type A dissection. Immediate medical target before surgery?ALower SBP to <160 mm Hg using IV nitroprusside aloneBLower HR to <60/min with IV beta-blocker and then lower SBP to 100-120 mm HgCStart IV heparin to prevent thrombosis while awaiting surgeryDUse IV hydralazine to rapidly reduce BP below 90/60 mm HgEAdminister high-dose nitroglycerin to reduce afterload onlyCheck my answer