A 65-year-old man presents to the emergency department with sudden-onset, severe, tearing chest pain that radiates to his back. His blood pressure is 190/110 mmHg in the right arm and 140/80 mmHg in the left arm. His heart rate is 112/min. A bedside chest radiograph shows a widened mediastinum. Suspecting an acute aortic dissection, arrange the following management steps in the most appropriate chronological order.
- 1Administer an intravenous beta-blocker (e.g., esmolol)
- 2Administer an intravenous vasodilator (e.g., nitroprusside)
- 3Perform computed tomography (CT) angiography of the chest and abdomen
- 4Consult cardiothoracic surgery for emergent operative repair
Cevap
The correct chronological sequence is to first administer an intravenous beta-blocker, followed by an intravenous vasodilator, then perform CT angiography to confirm the diagnosis, and finally consult cardiothoracic surgery for emergent repair.
The established protocol for suspected acute aortic dissection prioritizes strict heart rate and blood pressure control to halt the progression of the intimal tear. A beta-blocker must be given first to reduce heart rate and contractility (dP/dt). Once the heart rate is controlled (target <60/min), a vasodilator can be added to safely lower systolic blood pressure (target 100-120 mmHg) without causing reflex tachycardia. Only after the patient is medically stabilized should they be sent for definitive imaging (CT angiography), which is necessary to confirm the diagnosis and anatomical involvement before consulting surgery for a Type A dissection.
Adım Adım Çözüm
Anahtar Kavram
In the acute management of aortic dissection, intravenous beta-blockers must be administered before vasodilators to prevent reflex tachycardia and increased ventricular contractility (dP/dt), which would worsen aortic shear stress. This medical stabilization must precede confirmatory imaging and subsequent surgical repair.