## ASA Physical Status Classification **Key Point:** ASA III applies to patients with one or more moderate-to-severe systemic diseases. This patient has **two** systemic diseases (type 2 diabetes mellitus and hypertension), both requiring pharmacological management, which together constitute a moderate systemic disease burden — placing him in ASA III per current ASA 2020 guidelines. ### Classification Criteria | ASA Class | Definition | Examples | |-----------|-----------|----------| | **ASA I** | Healthy, no systemic disease | Fit 30-year-old for minor surgery | | **ASA II** | Mild systemic disease, no functional limitation | Single well-controlled condition: controlled HTN alone, or DM alone (HbA1c <8%), mild obesity, social smoker | | **ASA III** | Severe systemic disease with substantive functional limitation | Poorly controlled DM **or** HTN, DM + HTN together, morbid obesity (BMI ≥40), active hepatitis, alcohol dependence, ESRD on dialysis, history of MI/CVA >3 months ago | | **ASA IV** | Severe systemic disease that is a constant threat to life | Unstable angina, recent MI (<3 months), sepsis, DIC | | **ASA V** | Moribund patient not expected to survive 24 hrs without surgery | Ruptured AAA, massive trauma | | **ASA VI** | Brain-dead patient for organ donation | — | ### Why ASA III? 1. **Two concurrent systemic diseases:** The ASA 2020 updated examples explicitly list **"poorly controlled DM or HTN"** as ASA III, and more importantly, the **combination of DM + HTN** (even if individually "controlled") is cited as an ASA III example in the ASA's own illustrative list. 2. **HbA1c 7.8%:** While not severely uncontrolled, this reflects suboptimal glycemic control (target <7% for most patients). The ASA guidelines note HbA1c ≥8% as a clear ASA III marker, but the combination with hypertension tips this patient into ASA III regardless. 3. **BP 138/86 mmHg on medication:** Stage 1 hypertension on pharmacotherapy — not at goal (<130/80 mmHg per ACC/AHA 2017). This is not "well-controlled." 4. **No functional limitation:** The absence of symptoms does not preclude ASA III — the classification is based on disease burden and systemic impact, not solely on functional limitation. 5. **ASA II would apply** if the patient had only ONE of these conditions and it were well-controlled (e.g., HTN alone with BP at goal, or DM alone with HbA1c <7%). **Clinical Pearl (ASA 2020 Update):** The ASA Society revised its examples in 2020. A patient with **both DM and HTN** — even if individually managed — is classified as **ASA III**, not ASA II. ASA II is reserved for a single, truly well-controlled systemic disease. **High-Yield:** Do not confuse "no functional limitation" with ASA II. ASA III patients may be asymptomatic but carry a substantive systemic disease burden. The key discriminator between ASA II and ASA III is the **number and severity of comorbidities**, not symptoms alone. (Reference: ASA Physical Status Classification System, American Society of Anesthesiologists, 2020 update; Miller's Anesthesia, 9th ed., Chapter 38)
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