Christian Camacho-Mondragon, MD: No financial relationships to disclose
Background: Acute aortic dissection presents as an acute myocardial infarction in up to 2.5% of cases In these scenarios, traditional STEMI protocols, which emphasize rapid antithrombotic administration, can be fatal. Early recognition of cardiogenic shock phenotypes and the immediate activation of a multidisciplinary Shock Team are essential to prevent misdiagnosis
Methods: A 46-year-old male with no prior history presented with sudden, tearing chest pain (9/10). The initial ECG showed ST-segment elevation in V1-V2 and posterior leads (V7-V9), triggering a "Code STEMI" protocol. However, the patient’s clinical status rapidly deteriorated into SCAI Stage D cardiogenic shock. Findings included profound hypotension, acute pulmonary edema, and biochemical evidence of end-organ hypoperfusion with a lactate level of 4.3 mmol/L. The hemodynamic profile was consistent with acute RV failure compounded by severe aortic insufficiency. Given the "tearing" nature of the pain and the severity of the shock, the Shock Team was activated at the bedside. Bedside imaging identified a 6.5 cm dilated aortic root and an intimal flap, leading to the immediate deferral of antithrombotics and coronary angiography. CT angiography confirmed a Stanford Type A dissection (76 mm root) extending to the iliac bifurcation, involving the right coronary ostium and causing valve prolapse. The patient underwent emergency aortic root replacement and a saphenous vein graft to the RCA.
Outcome: This case illustrates the critical importance of a "Shock-First" mentality over a "Door-to-Balloon" obsession in complex presentations. The patient presented with a dual hemodynamic hit: acute RV infarction (causing hypotension) and acute aortic regurgitation (causing pulmonary edema). The role of the Shock Team was pivotal. By integrating clinical "red flags", such as the nature of the pain and the severity of the lactate elevation, with rapid bedside assessment, the team bypassed the catheterization laboratory. In ATAAD-induced shock, the administration of loading doses of P2Y12 inhibitors or heparin, standard in STEMI, significantly increases the risk of perioperative hemorrhage and mortality. Early multidisciplinary consultation allows for a "diagnostic pause" that is crucial when the hemodynamic phenotype does not match a simple coronary occlusion.
Conclusion: In the setting of STEMI complicated by shock clinicians must maintain a high index of suspicion for mechanical catastrophes like aortic dissection. Standardized Shock Team activation facilitates the rapid differentiation of shock etiologies, ensuring proper and individualized treatment, ultimately improving survival in these high-acuity cases.
