Source / episode info

• **Episode:**539
• **Title:**Divine Intervention Episode 539: 50 HY Corticosteroid Facts To Know For Step 1-3 (+ PDF worksheet)
• **Published:**2024-06-21
• Source:Episode page

One-liner

This episode provides a comprehensive review of corticosteroid physiology, covering adrenal cortex zonal function, the differential diagnosis and management of primary vs secondary adrenal insufficiency, common steroid-induced complications (e.g., osteoporosis, glaucoma), and high-yield associations in inflammatory and infectious diseases.

High-yield summary

• Adrenal Anatomy: The adrenal cortex has three zones: Zona glomerulosa (Mineralocorticoids/Aldosterone); Fasciculata (Glucocorticoids/Cortisol); Reticularis (Androgens/DHA).
• Primary Adrenal Insufficiency (AI): Caused by autoimmune destruction of the cortex. Leads to low cortisol, high ACTH, and characteristic electrolyte abnormalities: Hyperkalemia, Hyponatremia, and Metabolic Acidosis (due to aldosterone deficiency).
• Steroid Side Effects: Chronic use causes Cushingoid features (Moon facies, Buffalo hump), immunosuppression (risk of Pneumocystis jirovecii pneumonia [PCP]), osteopenia/osteoporosis, glaucoma, cataracts, and muscle atrophy.
• Exacerbations: IV corticosteroids are indicated for flares of asthma, COPD, Multiple Sclerosis (MS), Lupus, and Inflammatory Bowel Disease (IBD).
• Specific Associations: Steroids are used to treat conditions like Allergic Bronchopulmonary Aspergillosis (ABPA) and Sarcoidosis.

Learning objectives

• Differentiate the pathophysiology and clinical presentation of primary versus secondary adrenal insufficiency.
• Identify specific indications for corticosteroid use in inflammatory, pulmonary, and autoimmune conditions (e.g., ABPA, Sarcoidosis).
• Recognize common steroid side effects, including osteoporosis, glaucoma, myopathy, and immune suppression.
• Understand the hormonal feedback mechanisms governing ACTH release and cortisol metabolism (POMC -> ACTH/MSH).
• Apply knowledge of corticosteroid use in acute exacerbations (e.g., asthma, COPD) versus chronic management.

Board exam buzzwords