A 58-year-old man with a 10-year history of poorly controlled hypertension presents to the emergency department with acute onset chest pain radiating to the back. On examination, blood pressure is 180/110 mmHg (right arm) and 140/90 mmHg (left arm), heart rate 110/min, respiratory rate 24/min. Cardiac auscultation reveals an early diastolic murmur. Chest X-ray shows a widened mediastinum. Despite aggressive fluid resuscitation and vasopressor support, the patient develops hypotension (BP 85/55 mmHg), cool extremities, oliguria, and altered mental status. Which type of shock is this patient most likely experiencing?