A 63-year-old man is brought to the emergency department because of abrupt-onset severe chest pain that began 40 minutes ago while he was lifting a heavy box. He describes the pain as tearing and states that it radiates between his shoulder blades. He has also developed numbness and weakness of his left leg. His medical history includes poorly controlled hypertension, hyperlipidemia, and tobacco use disorder. He takes amlodipine inconsistently. He does not use cocaine or other stimulants. Temperature is 36.7°C (98.1°F), blood pressure is 208/116 mm Hg in the right arm and 172/94 mm Hg in the left arm, pulse is 112/min, and respiratory rate is 22/min. Oxygen saturation is 97% on room air. On physical examination, he appears pale, diaphoretic, and distressed. The right radial pulse is diminished compared with the left. Cardiac examination reveals a new high-pitched early diastolic murmur along the left sternal border. The left foot is cool, and the left dorsalis pedis pulse is absent. ECG shows sinus tachycardia without ischemic ST-segment changes. High-sensitivity troponin is normal. Intravenous esmolol is initiated, reducing the pulse to 62/min and the systolic blood pressure to 118 mm Hg. CT angiography demonstrates an intimal flap beginning in the ascending aorta and extending through the aortic arch into the descending thoracic and abdominal aorta. The dissection involves the origin of the left renal artery and extends into the left common iliac artery.
Which of the following is the most appropriate next step in management?
The correct answer is:
A) Emergent open surgical repair
This patient has an acute Stanford type A aortic dissection because the ascending aorta is involved. His abrupt tearing chest pain, interarm blood pressure difference, pulse deficits, new aortic regurgitation murmur, and evidence of lower-extremity malperfusion are classic manifestations. Extension into the descending aorta does not change the classification; any dissection involving the ascending aorta is type A.
Initial treatment of any acute aortic syndrome includes rapid anti-impulse therapy. An intravenous beta blocker such as esmolol reduces heart rate, blood pressure, and the force of left ventricular ejection against the injured aortic wall. This patient has already received appropriate initial stabilization. Because the dissection involves the ascending aorta, the next step is emergent open surgical repair.
Type A dissections can rapidly cause fatal complications, including rupture into the pericardial space with cardiac tamponade, acute severe aortic regurgitation, coronary artery obstruction, stroke, and branch-vessel malperfusion. Medical therapy alone cannot reliably prevent these complications. Surgical treatment generally involves replacement of the affected ascending aorta, with repair or replacement of the aortic valve and root when necessary.
The absent left pedal pulse and renal artery involvement indicate malperfusion but do not justify delaying central aortic repair. Definitive treatment of the proximal dissection is required to restore true-lumen flow and prevent rupture.
Answer choice B: Intravenous nitroprusside before beta blockade, is incorrect.
Nitroprusside may be added when blood pressure remains elevated after adequate beta blockade. Administering a vasodilator before controlling heart rate can cause reflex sympathetic activation, increasing contractility and aortic wall shear stress and potentially extending the dissection. In this patient, esmolol has already achieved appropriate anti-impulse control, and definitive surgery should not be delayed.
Answer choice C: Medical therapy with an oral beta blocker alone, is incorrect.
Long-term beta-blocker therapy is important after aortic dissection repair and is the initial definitive strategy for many uncomplicated Stanford type B dissections. However, ascending aortic involvement requires emergency surgery because of the high risk of rupture, tamponade, acute aortic regurgitation, and coronary or cerebral malperfusion. Medical treatment alone is inadequate.
Answer choice D: Thoracic endovascular aortic repair, is incorrect.
Endovascular stent-grafting is commonly used for complicated type B dissections involving the descending aorta, especially when there is rupture, refractory pain, uncontrolled hypertension, aneurysmal expansion, or organ malperfusion. Standard management of an acute type A dissection remains open surgical repair because the ascending aorta and aortic root are anatomically difficult to treat with routine endovascular techniques.
Answer choice E: Thrombolytic therapy, is incorrect.
Aortic dissection can mimic acute myocardial infarction or ischemic stroke, but thrombolysis can cause catastrophic bleeding, including aortic rupture, hemopericardium, and tamponade. The normal troponin and absence of ischemic ECG changes further argue against coronary thrombosis. Thrombolytic therapy is contraindicated.
Key Learning Point
Any acute aortic dissection involving the ascending aorta is classified as Stanford type A and requires emergent open surgical repair after rapid intravenous beta-blocker–based anti-impulse therapy. Uncomplicated type B dissection is generally managed medically, whereas complicated type B disease may require endovascular repair.
