A 42-year-old man with chronic obstructive pulmonary disease (COPD) exacerbation is prescribed methylprednisolone 40 mg IV daily for 5 days. On day 3, he develops severe hypokalemia (K⁺ 2.8 mmol/L), hypertension (160/100 mmHg), and hyperglycemia (fasting glucose 280 mg/dL). His baseline renal function is normal. What is the most appropriate next step in management?

Explanation

## Management of Glucocorticoid-Induced Adverse Effects During Acute Therapy ### Clinical Context This patient is experiencing expected **mineralocorticoid and hyperglycemic side effects** of high-dose IV methylprednisolone during acute COPD exacerbation. The question tests whether the clinician will inappropriately discontinue necessary therapy versus managing side effects while continuing indicated treatment. ### Glucocorticoid Side Effects: Mechanism & Timing | Side Effect | Mechanism | Onset | Reversibility | |---|---|---|---| | **Hypokalemia** | Mineralocorticoid activity (Na⁺ reabsorption, K⁺ wasting) | 24–72 hours | Reversible within days of cessation | | **Hypertension** | Sodium and fluid retention; increased catecholamine sensitivity | 24–72 hours | Reversible within 1–2 weeks | | **Hyperglycemia** | Increased hepatic gluconeogenesis; insulin resistance | 24–48 hours | Reversible within days of cessation | | **Immunosuppression** | T-cell and neutrophil suppression | Immediate | Reversible over weeks | ### Why Continuation with Symptom Management Is Correct **Key Point:** Short-term high-dose glucocorticoids (5–7 days) for acute COPD exacerbation are **life-saving**. The side effects are: 1. **Expected and dose-dependent** 2. **Reversible** after cessation 3. **Manageable** with supportive care Discontinuing therapy prematurely risks: - Inadequate bronchodilation and respiratory failure - Relapse of COPD exacerbation - Potential intubation and ICU admission ### Management of Identified Side Effects ```mermaid flowchart TD A[High-dose IV methylprednisolone for COPD exacerbation]:::outcome A --> B{Adverse effects develop?}:::decision B -->|Yes| C[Continue glucocorticoid; manage side effects]:::action C --> D[Hypokalemia: K+ supplementation 20-40 mEq/day]:::action C --> E[Hypertension: add antihypertensive if SBP > 160]:::action C --> F[Hyperglycemia: insulin if glucose > 250 mg/dL]:::action D --> G[Recheck electrolytes daily; adjust supplementation]:::action E --> H[Taper glucocorticoid as planned; reassess BP]:::action H --> I[All effects resolve within 1-2 weeks post-cessation]:::outcome ``` ### Potassium Supplementation Strategy **High-Yield:** - Target serum K⁺ > 3.5 mmol/L during acute therapy - Oral supplementation: KCl 20–40 mEq daily (divided doses) - IV supplementation: if K⁺ < 2.5 mmol/L or symptomatic (arrhythmias) - Recheck K⁺ every 24–48 hours; adjust dose accordingly ### Why Other Options Are Incorrect **Clinical Pearl:** Methylprednisolone has **minimal mineralocorticoid activity** compared to hydrocortisone or dexamethasone. The hypokalemia is still significant but is a **known, manageable side effect** of any glucocorticoid at high doses. [cite:Harrison 21e Ch 330; KD Tripathi 8e Ch 61]