A 72-year-old woman with a history of acute myocardial infarction 3 months ago, currently on dual antiplatelet therapy and a beta-blocker, presents for emergency repair of a ruptured abdominal aortic aneurysm. She is hemodynamically unstable (BP 95/60 mmHg, HR 110 bpm), in severe pain, and has signs of hypovolemic shock. Recent echocardiography showed an ejection fraction of 40% with apical akinesis. What is her ASA Physical Status classification?

## ASA Classification in Emergency Settings **Key Point:** The suffix **E** (Emergency) is added to the base ASA class when surgery is performed on an emergent or urgent basis. It is NOT a separate class but a modifier. ### Understanding the "E" Suffix **High-Yield:** - The **E suffix indicates urgency**, not severity of disease. - A patient who is ASA IV and requires emergency surgery is classified as **ASA IVE**, not ASA V. - ASA V is reserved for moribund patients expected to die within 24 hours regardless of surgery. ### Analysis of This Patient #### Base ASA Class (Without Emergency Modifier) 1. **Recent MI (3 months ago):** Significantly increased perioperative cardiac risk. 2. **Reduced Ejection Fraction (40%):** Indicates moderate left ventricular dysfunction. 3. **Hemodynamic Instability:** BP 95/60 mmHg, HR 110 bpm—signs of shock. 4. **Severe Systemic Disease:** Post-MI state with LV dysfunction is a **constant threat to life**. **→ Base classification: ASA IV** (severe systemic disease that is a constant threat to life) #### Adding the Emergency Modifier - **Ruptured AAA:** Life-threatening emergency requiring immediate surgical intervention. - **Hemodynamic Shock:** Patient is unstable and deteriorating. - **→ Final classification: ASA IVE** ### ASA Classification Hierarchy with Emergency Modifier | Class | Definition | Emergency Modifier | |-------|-----------|--------------------| | **I** | Healthy | ASA IE (rare) | | **II** | Mild systemic disease | ASA IIE | | **III** | Severe systemic disease, no functional threat | ASA IIIE | | **IV** | Severe systemic disease, constant threat to life | **ASA IVE** ← This patient | | **V** | Moribund, expected to die within 24 hrs | ASA VE (rarely used) | **Clinical Pearl:** The presence of hemodynamic instability, shock, or life-threatening pathology (ruptured AAA) does NOT automatically make a patient ASA V. ASA V is reserved for patients who are **expected to die within 24 hours regardless of whether surgery is performed**. This patient may survive with emergency repair, so she is not ASA V. **Mnemonic:** **E = Emergency/Urgent**. Always add E to the base class when surgery is unplanned or emergent. The base class reflects the patient's medical status; the E reflects the timing of surgery.