Calcium Administration During Therapeutic Plasma Exchange

Ionized Calcium Monitoring and Maintenance

The American College of Critical Care recommends maintaining ionized calcium levels between 1.1-1.3 mmol/L (normal range) to ensure adequate replacement during TPE, with a minimum level of 0.9 mmol/L to support cardiovascular function and coagulation 1, 2
Ionized calcium levels should be monitored at 20-30 minute intervals during TPE to prevent hypocalcemic reactions 1, 2

The Society of Critical Care Medicine states that ionized calcium is essential for coagulation cascade function and platelet adhesion, and low ionized calcium impairs cardiovascular function, reducing cardiac contractility and systemic vascular resistance 3, 4, 1
Citrate anticoagulant chelates ionized calcium, and its metabolism may be impaired in patients with hepatic dysfunction, hypothermia, or hypoperfusion, leading to hypocalcemia during TPE 1, 3

The American Society of Health-System Pharmacists recommends using calcium gluconate as the standard agent for TPE, as it can be safely added to albumin replacement fluid and administered peripherally, with central venous access preferred for sustained calcium infusions to avoid tissue injury 2, 3
Calcium chloride is not typically used during TPE due to tissue toxicity risk with peripheral administration, but may be preferred in massive transfusion/trauma settings due to faster ionized calcium release 2, 3

The American Heart Association advises exercising extreme caution in patients on cardiac glycosides, as synergistic arrhythmias may occur, and close ECG monitoring is mandatory 2
Magnesium deficiency should be checked and corrected before expecting full calcium normalization, as hypomagnesemia is present in 28% of hypocalcemic ICU patients and prevents adequate calcium correction 2
Ionized calcium levels are pH-dependent, and correction of acidosis may paradoxically worsen hypocalcemia 1, 2, 3