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Emergency And Acute Medicine-Hypercalcemia
Basics
Description Hypercalcemia severity depends on the absolute calcium level and the rate of rise. It is detected in approximately 0.1–1% of routine screenings. Most cases are mild (<12 mg/dL) and asymptomatic. Hypercalcemic crisis, typically >14 mg/dL, causes severe and potentially life-threatening manifestations. Circulating calcium exists as ionized (45%, the only physiologically active form), protein-bound (40%, mainly albumin), and complexed to anions (15%).
Etiology The most common causes are primary hyperparathyroidism and malignancy, followed by miscellaneous conditions.
Diagnosis
Signs and symptoms Neurologic features include headache, fatigue, lethargy, weakness, impaired concentration, confusion, depression, paranoia, stupor, or coma. Renal manifestations include polyuria, polydipsia, dehydration, oliguria in renal failure, nephrolithiasis, nephrocalcinosis, and interstitial nephritis. Gastrointestinal symptoms include anorexia, nausea, vomiting, abdominal pain, constipation, peptic ulcer disease, and pancreatitis. Dermatologic findings include pruritus. Classic mnemonic: “stones, bones, groans, thrones, and psychiatric overtones,” where “thrones” refers to polyuria.
Pediatric considerations Failure to thrive, delayed development, and potential intellectual impairment.
Physical exam Neurologic findings include irritability, lethargy, hyporeflexia, and coma. Cardiovascular findings include hypotension from volume depletion or hypertension, sinus bradycardia, and rarely cardiac arrest. Renal signs reflect dehydration. Dermatologic findings include band keratopathy and ectopic calcifications. Pediatric findings may include characteristic facies (pug nose, broad nasal bridge, cupid’s-bow upper lip) and hypotonia.
Essential workup Measure total and ionized calcium and albumin. Normal total calcium is <10.5 mg/dL. Corrected calcium (mg/dL) = measured calcium + 0.8 × (4.0 − albumin [g/dL]). Obtain electrolytes, BUN/creatinine, and glucose. ECG may show shortened QT interval, PR prolongation, QRS widening, sinus bradycardia, conduction blocks, digoxin sensitivity, and rarely Osborn J-waves.
Diagnosis tests and interpretation
Laboratory Assess phosphate, protein, urinalysis, and parathyroid hormone (PTH). Elevated or high-normal PTH suggests primary hyperparathyroidism; PTH <20 pg/mL warrants evaluation for PTH-related peptide and vitamin D metabolites. Elevated 25-hydroxyvitamin D suggests exogenous intake; elevated 1,25-dihydroxyvitamin D suggests lymphoma or sarcoidosis. Check digoxin levels if applicable and thyroid studies if indicated.
Imaging CT head for altered mental status and chest imaging with malignancy workup if no clear cause.
Diagnostic procedures Parathyroidectomy is indicated for symptomatic or severe primary hyperparathyroidism and may be urgent.
Differential diagnosis Primary hyperparathyroidism (most common outpatient cause; adenoma most frequent) typically causes mild chronic elevations. Malignancy is the most common inpatient cause, often with rapid onset, higher calcium levels, and greater symptom burden, commonly due to PTH-related peptide or osteolytic disease (e.g., breast, lung, kidney, head and neck, multiple myeloma, lymphoma). Miscellaneous causes include granulomatous disease, excess calcium or vitamin D intake, thiazides, familial hypocalciuric hypercalcemia, vitamin A toxicity, milk-alkali syndrome, lithium therapy, renal transplantation, hyperthyroidism, and acute tubular necrosis.
Pediatric considerations Primary hyperparathyroidism is less common; consider infantile hypercalcemia, immobilization hypercalcemia in adolescents, and vitamin D sensitivity.
Treatment
Prehospital Routine stabilization.
Initial stabilization/therapy ABCs, IV access, oxygen, cardiac monitoring. Administer 0.9% saline (1 L bolus or 20 mL/kg) for hypotension or severe dehydration. Address altered mental status with glucose assessment and supportive measures.
Emergency department management Treat immediately if corrected calcium >14 mg/dL or if symptomatic. Mild, asymptomatic cases do not require emergency therapy. Volume repletion with isotonic saline at 200–300 mL/hr targeting urine output 100–150 mL/hr; total 2–5 L/day may be required with close monitoring for overload. Correct electrolyte abnormalities. Renal elimination with loop diuretics (furosemide) only after adequate volume expansion; avoid thiazides. Dialysis may be required in renal failure. Inhibit bone resorption with bisphosphonates (first-line) and calcitonin for rapid but modest effect. Consider hydrocortisone for vitamin D–mediated or granulomatous causes. Encourage ambulation when appropriate. Treat the underlying cause and discontinue offending agents.
Medication First line Calcitonin 4 IU/kg IM/SC q12h; pamidronate 60–90 mg IV over 2–24 hr; etidronate 7.5 mg/kg IV daily for 3–7 days; furosemide 10–40 mg IV q6–8h (pediatrics 1–2 mg/kg). Second line Gallium nitrate 200 mg/m²/day IV ×5 days; hydrocortisone 200–400 mg/day IV for 3–5 days; plicamycin 25 μg/kg/day IV.
Pediatric considerations Loop diuretics are rarely needed and may worsen renal function; bisphosphonates appear safe but data are limited.
Follow-up and disposition
Admission criteria Corrected calcium >13 mg/dL, symptoms attributable to hypercalcemia, ECG changes, or need for monitored care; ICU for levels >14 mg/dL or severe manifestations.
Discharge criteria Corrected calcium <13 mg/dL with no symptoms.
Issues for referral Arrange prompt evaluation to determine etiology and long-term management; consider endocrinology consultation.
Follow-up recommendations Maintain hydration and monitor for mental status changes.
Key points Base treatment decisions on symptoms and corrected calcium levels. All patients with calcium >14 mg/dL require treatment regardless of symptoms. Monitor ECG closely and balance aggressive hydration against the risk of fluid overload.
Basics
Description Hypercalcemia severity depends on the absolute calcium level and the rate of rise. It is detected in approximately 0.1–1% of routine screenings. Most cases are mild (<12 mg/dL) and asymptomatic. Hypercalcemic crisis, typically >14 mg/dL, causes severe and potentially life-threatening manifestations. Circulating calcium exists as ionized (45%, the only physiologically active form), protein-bound (40%, mainly albumin), and complexed to anions (15%).
Etiology The most common causes are primary hyperparathyroidism and malignancy, followed by miscellaneous conditions.
Diagnosis
Signs and symptoms Neurologic features include headache, fatigue, lethargy, weakness, impaired concentration, confusion, depression, paranoia, stupor, or coma. Renal manifestations include polyuria, polydipsia, dehydration, oliguria in renal failure, nephrolithiasis, nephrocalcinosis, and interstitial nephritis. Gastrointestinal symptoms include anorexia, nausea, vomiting, abdominal pain, constipation, peptic ulcer disease, and pancreatitis. Dermatologic findings include pruritus. Classic mnemonic: “stones, bones, groans, thrones, and psychiatric overtones,” where “thrones” refers to polyuria.
Pediatric considerations Failure to thrive, delayed development, and potential intellectual impairment.
Physical exam Neurologic findings include irritability, lethargy, hyporeflexia, and coma. Cardiovascular findings include hypotension from volume depletion or hypertension, sinus bradycardia, and rarely cardiac arrest. Renal signs reflect dehydration. Dermatologic findings include band keratopathy and ectopic calcifications. Pediatric findings may include characteristic facies (pug nose, broad nasal bridge, cupid’s-bow upper lip) and hypotonia.
Essential workup Measure total and ionized calcium and albumin. Normal total calcium is <10.5 mg/dL. Corrected calcium (mg/dL) = measured calcium + 0.8 × (4.0 − albumin [g/dL]). Obtain electrolytes, BUN/creatinine, and glucose. ECG may show shortened QT interval, PR prolongation, QRS widening, sinus bradycardia, conduction blocks, digoxin sensitivity, and rarely Osborn J-waves.
Diagnosis tests and interpretation
Laboratory Assess phosphate, protein, urinalysis, and parathyroid hormone (PTH). Elevated or high-normal PTH suggests primary hyperparathyroidism; PTH <20 pg/mL warrants evaluation for PTH-related peptide and vitamin D metabolites. Elevated 25-hydroxyvitamin D suggests exogenous intake; elevated 1,25-dihydroxyvitamin D suggests lymphoma or sarcoidosis. Check digoxin levels if applicable and thyroid studies if indicated.
Imaging CT head for altered mental status and chest imaging with malignancy workup if no clear cause.
Diagnostic procedures Parathyroidectomy is indicated for symptomatic or severe primary hyperparathyroidism and may be urgent.
Differential diagnosis Primary hyperparathyroidism (most common outpatient cause; adenoma most frequent) typically causes mild chronic elevations. Malignancy is the most common inpatient cause, often with rapid onset, higher calcium levels, and greater symptom burden, commonly due to PTH-related peptide or osteolytic disease (e.g., breast, lung, kidney, head and neck, multiple myeloma, lymphoma). Miscellaneous causes include granulomatous disease, excess calcium or vitamin D intake, thiazides, familial hypocalciuric hypercalcemia, vitamin A toxicity, milk-alkali syndrome, lithium therapy, renal transplantation, hyperthyroidism, and acute tubular necrosis.
Pediatric considerations Primary hyperparathyroidism is less common; consider infantile hypercalcemia, immobilization hypercalcemia in adolescents, and vitamin D sensitivity.
Treatment
Prehospital Routine stabilization.
Initial stabilization/therapy ABCs, IV access, oxygen, cardiac monitoring. Administer 0.9% saline (1 L bolus or 20 mL/kg) for hypotension or severe dehydration. Address altered mental status with glucose assessment and supportive measures.
Emergency department management Treat immediately if corrected calcium >14 mg/dL or if symptomatic. Mild, asymptomatic cases do not require emergency therapy. Volume repletion with isotonic saline at 200–300 mL/hr targeting urine output 100–150 mL/hr; total 2–5 L/day may be required with close monitoring for overload. Correct electrolyte abnormalities. Renal elimination with loop diuretics (furosemide) only after adequate volume expansion; avoid thiazides. Dialysis may be required in renal failure. Inhibit bone resorption with bisphosphonates (first-line) and calcitonin for rapid but modest effect. Consider hydrocortisone for vitamin D–mediated or granulomatous causes. Encourage ambulation when appropriate. Treat the underlying cause and discontinue offending agents.
Medication First line Calcitonin 4 IU/kg IM/SC q12h; pamidronate 60–90 mg IV over 2–24 hr; etidronate 7.5 mg/kg IV daily for 3–7 days; furosemide 10–40 mg IV q6–8h (pediatrics 1–2 mg/kg). Second line Gallium nitrate 200 mg/m²/day IV ×5 days; hydrocortisone 200–400 mg/day IV for 3–5 days; plicamycin 25 μg/kg/day IV.
Pediatric considerations Loop diuretics are rarely needed and may worsen renal function; bisphosphonates appear safe but data are limited.
Follow-up and disposition
Admission criteria Corrected calcium >13 mg/dL, symptoms attributable to hypercalcemia, ECG changes, or need for monitored care; ICU for levels >14 mg/dL or severe manifestations.
Discharge criteria Corrected calcium <13 mg/dL with no symptoms.
Issues for referral Arrange prompt evaluation to determine etiology and long-term management; consider endocrinology consultation.
Follow-up recommendations Maintain hydration and monitor for mental status changes.
Key points Base treatment decisions on symptoms and corrected calcium levels. All patients with calcium >14 mg/dL require treatment regardless of symptoms. Monitor ECG closely and balance aggressive hydration against the risk of fluid overload.
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