Calcium Chloride Administration Post-CABG

Rationale for Calcium Administration

Calcium chloride should be promptly administered intravenously to treat hypocalcemia after CABG, as hypocalcemia commonly occurs due to hemodilution and citrated blood product transfusion, and calcium plays critical physiological roles in coagulation, cardiac rhythm, inotropy, and vascular tone, according to the British Journal of Anaesthesia 1
The European Association for Cardio-Thoracic Surgery, European Association of Cardiothoracic Anesthesiologists, and European Board of Cardiothoracic Surgery guidelines recommend prompt treatment of hypocalcemia due to its impact on cardiac surgery-relevant parameters 1
Hypocalcemia is a frequent complication during and after cardiopulmonary bypass for several reasons, including hemodilution from CPB, citrated blood product transfusion, and physiological importance of calcium in maintaining cardiac contractility, normal cardiac rhythm, coagulation function, and vascular tone 1

Optimize magnesium levels, as hypomagnesemia can impair calcium homeostasis, and minimize further citrated blood product transfusion when possible, to address underlying causes of hypocalcemia 1
Maintain normal pH to optimize ionized calcium availability, as part of the clinical management of hypocalcemia 1
Clinical indicators of hypocalcemia include hemodynamic instability, arrhythmias, and coagulopathy in the setting of recent blood product transfusion, according to the British Journal of Anaesthesia 1

The administration of calcium chloride after CABG increases blood pressure through peripheral vasoconstriction and increased systemic vascular resistance, but this effect is transient and does not improve cardiac output in hemodynamically stable patients, according to the British Journal of Anaesthesia 2, 3
Calcium chloride should be promptly administered to treat documented hypocalcemia (ionized calcium <1.8 mEq/L or <3.6 mg/dL) after CABG, as hypocalcemia commonly occurs from hemodilution and citrated blood product transfusion, as recommended by the British Journal of Anaesthesia 2, 3

The primary rationale for calcium chloride administration is correcting calcium's critical roles in coagulation, cardiac rhythm, and myocardial contractility—not for routine blood pressure support, as stated in the British Journal of Anaesthesia 2, 3
In hypertensive patients, monitor for excessive blood pressure elevation (>140/90 mmHg) and consider reducing dose or using alternative strategies, according to the European Heart Journal 4