The Grandmother Who Faints Before Breakfast - Endocrinology clinical simulation case. An 84-year-old woman with type 2 diabetes mellitus and stage 4...
An 84-year-old woman with type 2 diabetes mellitus and stage 4 chronic kidney disease is brought from her nursing home after being found unresponsive at dawn, diaphoretic, with a documented fingerstick glucose of 28 mg/dL (1.55 mmol/L). Her medication list includes glipizide 10 mg twice daily, metformin 500 mg twice daily (held three days ago due to low eGFR), and basal insulin glargine 14 units at bedtime.
Acute Resuscitation Milestones & Priorities
Clinical phases and key interventions encountered in this emergency module:
Sulfonylureas (glipizide, glyburide, glimepiride) are Beers Criteria potentially inappropriate medications in adults ≥65 years and are contraindicated when eGFR <30 mL/min/1.73 m² per KDIGO 2024.
Octreotide is the specific antidote for sulfonylurea-induced hypoglycemia because it suppresses pancreatic beta-cell insulin secretion; dextrose alone is insufficient.
Renal impairment prolongs sulfonylurea half-life from 3-7 hours to >36 hours through accumulation of active hydroxy metabolites, creating recurrent pre-dawn hypoglycemia.
Deprescribing is the definitive intervention; dose reduction does not eliminate the sulfonylurea-driven insulin secretion mechanism in CKD stage 4-5.
Metformin is contraindicated at eGFR <30 mL/min/1.73 m² due to lactic acidosis risk; appropriate to hold indefinitely in this patient.
Caregiver education and a written hypoglycemia action plan are essential to prevent nocturnal recurrence in frail elderly patients.
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