A 62-year-old man presents to the emergency department complaining of severe, sudden-onset tearing chest pain that radiates to his back. His blood pressure is 196/112 mm Hg in the right arm and 188/108 mm Hg in the left arm. His heart rate is 114/min. On physical examination, a decrescendo diastolic murmur is heard at the right upper sternal border. An electrocardiogram shows sinus tachycardia with no ischemic changes. A chest radiograph reveals a widened mediastinum. Arrange the following management steps in the most appropriate sequential order for this patient, from initial stabilization to definitive treatment.
- 1Initiate an intravenous beta-blocker infusion (e.g., esmolol).
- 2Initiate an intravenous vasodilator (e.g., sodium nitroprusside).
- 3Obtain a definitive cross-sectional imaging study of the aorta.
- 4Transfer the patient to the operating room for emergency surgical repair.
Cevap
The correct sequence is: 1) Initiate an intravenous beta-blocker infusion, 2) Initiate an intravenous vasodilator, 3) Obtain a definitive cross-sectional imaging study of the aorta, 4) Transfer the patient to the operating room for emergency surgical repair.
The initial management of suspected acute aortic dissection focuses on strict anti-impulse therapy to halt the progression of the intimal tear. The absolute first step is heart rate control using a short-acting intravenous beta-blocker (e.g., esmolol or labetalol) to decrease left ventricular contractility and lower aortic wall shear stress (). Only after the heart rate is controlled (target /min) should an intravenous vasodilator (e.g., sodium nitroprusside) be added to achieve a target systolic blood pressure of mm Hg. Initiating a vasodilator before beta-blockade is strictly contraindicated as it causes reflex tachycardia, which worsens aortic sheer stress. Once the patient's hemodynamics are stabilized, urgent definitive imaging (CT of the aorta or transesophageal echocardiography) must be obtained to classify the dissection into Stanford Type A (involving the ascending aorta) or Type B (descending aorta only). Because this patient's clinical presentation (new decrescendo diastolic murmur of aortic regurgitation) strongly indicates a Type A dissection, the final step in the sequence is emergency open surgical repair.
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Anahtar Kavram
Management of acute aortic dissection: Anti-impulse therapy (beta-blocker before vasodilator) followed by definitive imaging and surgical repair.