Management of Hypocalcemia
Assessment and Classification
- Severe hypocalcemia is characterized by ionized calcium levels below 0.8 mmol/L and is associated with cardiac dysrhythmias requiring prompt correction 1
Acute Management of Severe/Symptomatic Hypocalcemia
- For severe hypocalcemia (ionized calcium <0.8 mmol/L) or symptomatic patients, administer intravenous calcium immediately 1
- Calcium chloride is preferred over calcium gluconate in emergency situations and in patients with liver dysfunction 1
- 10 mL of 10% calcium chloride contains 270 mg of elemental calcium 2
- 10 mL of 10% calcium gluconate contains only 90 mg of elemental calcium 1
- In trauma patients with hypocalcemia, prompt correction is essential as low calcium levels are associated with platelet dysfunction, decreased clot strength, increased blood transfusion requirements, and higher mortality 1, 2
Special Considerations for Massive Transfusion
- During massive transfusion, continuous IV calcium is required due to citrate-mediated chelation of serum calcium 1, 2
- Each unit of packed red blood cells or fresh frozen plasma contains approximately 3g of citrate that chelates calcium 2
- Monitor ionized calcium levels frequently during massive transfusion 2
Management of Chronic Hypocalcemia
- In CKD patients, an individualized approach is recommended 3
- Significant or symptomatic hypocalcemia should be corrected, but routine correction of mild asymptomatic hypocalcemia is not universally recommended 1, 3
- For patients on dialysis, maintain dialysate calcium concentration between 1.25 and 1.50 mmol/L (2.5 and 3.0 mEq/L) 3
Hypocalcemia in Cancer Patients
- For hypercalcemia of malignancy, bisphosphonates (IV pamidronate or zoledronic acid) are effective 4
- Parenteral hydration with normal saline not only corrects hypercalcemia-associated hypovolemia but also promotes calciuresis 4
- For refractory cases, denosumab may be considered (approved by FDA but not EMA for this indication) 4