A 58-year-old man with a history of stable angina, well-controlled hypertension, and mild chronic kidney disease (eGFR 45 mL/min/1.73m²) is scheduled for elective hernia repair. Regarding his ASA Physical Status classification, all of the following are correct EXCEPT:

Explanation

## Clinical Case Analysis: ASA PS Classification in Multimorbid Patient ### Patient Summary - 58-year-old male - Stable angina (controlled, not acute) - Well-controlled hypertension - Mild CKD (eGFR 45 = Stage 3b) - Elective hernia repair (non-emergency) ### ASA PS Classification Decision **Key Point:** ASA PS classification is based on the **severity and functional impact** of systemic disease, NOT the number of conditions. This patient has **multiple comorbidities but they are stable and controlled**. The presence of multiple diseases does not automatically elevate the ASA PS grade if they are not functionally limiting or severe. ### Correct ASA PS Assignment | Feature | Assessment | |---------|------------| | Stable angina | Managed, not acute — does not limit activity | | Hypertension | Well-controlled — no functional limitation | | CKD Stage 3b | Mild renal impairment, eGFR 45 — asymptomatic | | Overall functional status | No incapacity or significant limitation | | **Correct ASA PS Grade** | **PS II** (mild systemic disease, no functional limitation) | **High-Yield:** This patient is **ASA PS II, not PS III**. The key is that all conditions are stable and controlled, with no functional limitation. ASA PS III requires **severe** systemic disease that **limits activity**. ### Analysis of Each Option **Option 0 (INCORRECT — THE ANSWER):** - States the patient is ASA PS III due to "multiple severe systemic diseases" - This is wrong because: 1. The diseases are **controlled**, not uncontrolled 2. There is **no functional limitation** documented 3. Stable angina does not limit activity in this patient 4. The patient should be classified as **ASA PS II**, not PS III **Option 1 (CORRECT):** - ASA PS II has perioperative mortality risk of ~0.4–1.8% - This statement is accurate for PS II classification **Option 2 (CORRECT):** - Stable angina and CKD Stage 3b both warrant preoperative assessment - Cardiac risk stratification and renal function monitoring are appropriate - This is a clinically sound statement **Option 3 (CORRECT):** - If angina became unstable (limiting activity, rest symptoms), PS would upgrade to PS III - If AKI developed (acute decompensation), PS could upgrade to PS III or IV - This represents appropriate risk stratification logic ### Clinical Pearl **Warning:** A common mistake is equating "multiple comorbidities" with higher ASA PS grade. The ASA PS system grades **severity and functional impact**, not disease count. A patient with 5 well-controlled conditions may be PS I or II; a patient with 1 severe, uncontrolled condition may be PS III or IV. ### Mnemonic **ASA PS Grading Logic:** **Control + Limitation = Grade** - Controlled + No limitation → Lower grade - Uncontrolled + Functional limitation → Higher grade - Multiple diseases ≠ automatically higher grade (if all controlled) [cite:Miller's Anesthesia 8e Ch 27]