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Acute hypermagnesemia after laxative use
1Department of Medicine, Mercy Memorial Hospital, Monroe, Michigan, USA.
Annals of Emergency Medicine
|November 1, 1996
Summary
A patient survived severe hypermagnesemia after ingesting a cathartic agent, even with normal kidney function. This case highlights the importance of considering magnesium toxicity in patients with cardiac arrest and hypotension.
Area of Science:
- Nephrology
- Toxicology
- Emergency Medicine
Background:
- Hypermagnesemia, a condition of elevated serum magnesium levels, can lead to severe cardiovascular and neurological complications.
- While often associated with renal insufficiency, it can occur in individuals with normal kidney function following excessive intake of magnesium-containing substances.
Observation:
- A patient presented with hypotension, cardiopulmonary arrest, and coma after ingesting a large dose of a cathartic agent.
- Serum magnesium levels were critically high at 21.7 mg/dL (8.9 mmol/L) 9 hours post-admission.
- The patient experienced a prolonged magnesium elimination half-life of 27.7 hours.
Findings:
- The patient's condition significantly improved with intravenous calcium, saline infusion, and cardiorespiratory support.
- Survival was achieved despite serum magnesium levels exceeding 18 mg/dL (7.4 mmol/L), a range rarely reported with survival.
- This case demonstrates that hypermagnesemia can manifest and be life-threatening even in patients with preserved renal function.
Implications:
- Clinicians should consider hypermagnesemia in the differential diagnosis for patients presenting with unexplained hypotension, cardiac arrest, or neurological impairment.
- Prompt recognition and management, including calcium administration and supportive care, are crucial for favorable outcomes.
- This case underscores the potential toxicity of over-the-counter magnesium-containing agents and the importance of patient education regarding their use.