VETINUITY
Calcium gluconate is administered intravenously at 14 to 42 mg/kg in dogs and cats to treat acute ionized hypocalcemia and severe hyperkalemia.
Per the Vetinuity calcium gluconate dose calculator below, intravenous calcium gluconate is administered at 14 to 42 mg/kg as a slow injection to treat symptomatic ionized hypocalcemia and severe hyperkalemia in dogs and cats.
| Indication | Species | Dose | Route and frequency |
|---|---|---|---|
| Acute ionized hypocalcemia and anesthetic support | Dog | 14-42 mg/kg | IV Slow IV over 10 to 20 minutes |
| Citrate-induced hypocalcemia during apheresis | Dog | 14-28 mg/kg | IV Constant rate infusion titrated to ionized calcium |
| Hyperkalemia secondary to urethral obstruction | Cat | 50-100 mg/kg | IV Slow IV over 5 to 10 minutes with ECG monitoring |
| Sodium fluoroacetate toxicosis and hypocalcemia | Cat | 50-100 mg/kg | IV Slow IV over 10 to 15 minutes |
In dogs, 10 percent calcium gluconate provides 9.3 mg elemental calcium per mL (100 mg/mL salt); intravenous administration of 14 to 42 mg/kg rapidly raises ionized calcium levels, but effects on plasma concentration are short-lived, lasting only minutes.
In cats presenting with male urethral obstruction and potassium exceeding 7.5 mEq/L, intravenous calcium gluconate rapidly stabilizes cardiac myocyte membranes alongside fluid boluses and relief of obstruction.
Ionized hypocalcemia (ionized calcium below 1.25 mmol/L) occurs in critically ill canine and feline patients, particularly those presenting with acute kidney injury, pancreatitis, severe trauma, sepsis, or parathyroid disease. In dogs following blunt or penetrating trauma, ionized hypocalcemia is associated with increased requirement for vasopressors, blood products, and intensive care, as well as reduced survival rates. Emergency parenteral therapy with 10 percent calcium gluconate is indicated when clinical signs of neuromuscular hyperexcitability or cardiovascular dysfunction develop, or when ionized hypocalcemia is moderate to severe.
In male cats presenting with urethral obstruction and severe hyperkalemia (potassium exceeding 7.5 mEq/L), calcium gluconate provides immediate cardioprotection by restoring normal cardiac cell membrane excitability. Intravenous fluid boluses, calcium gluconate administration, and prompt unobstruction result in a rapid median potassium reduction of 29 percent within 4 hours. Additional pharmacological interventions such as insulin with dextrose, terbutaline, or sodium bicarbonate offer no statistically significant additional benefit over fluid therapy and calcium gluconate alone.
A 10 percent calcium gluconate solution contains 100 mg/mL of calcium gluconate salt, which corresponds to approximately one-third the elemental calcium concentration of a 10 percent calcium chloride solution (3:1 ratio). Intravenous doses of 14, 28, and 42 mg/kg produce equivalent increases in ionized calcium and cardiovascular performance compared to equimolar calcium chloride doses in dogs under anesthesia. Rapidity of dissociation excludes hepatic metabolism as a rate-limiting step, making calcium gluconate effective even during acute metabolic crises.
During therapeutic plasma exchange or plateletpheresis in dogs, citrate anticoagulation causes progressive citrate accumulation, driving ionized calcium concentrations below 1.0 mmol/L and producing hypomagnesemia. Prophylactic constant rate infusions of 10 percent calcium gluconate (titrated to serial ionized calcium measurements) effectively prevent life-threatening cardiac arrhythmias, muscle tremors, and lip licking during apheresis procedures in small and large dogs.
In toxicological emergencies such as sodium fluoroacetate intoxication in cats, severe metabolic derangements include metabolic acidosis, hyperkalemia, hypocalcemia, bilateral mydriasis, seizures, and ventricular arrhythmias. Administration of parenteral calcium gluconate combined with sodium succinate significantly improves survival rates from 37.5 percent to 75 percent. Similarly, dogs developing acute hypocalcemia and severe tremors following accidental hypertonic sodium phosphate absorption normalize within 12 hours after slow intravenous calcium gluconate and fluid administration.
Calcium gluconate must be administered via slow intravenous injection with continuous electrocardiographic monitoring. Parenteral administration is strongly preferred over high osmolality oral calcium preparations, which can cause severe mucosal inflammation and gastrointestinal damage. In cardiopulmonary arrest, advanced life support interventions including calcium gluconate should be reserved strictly for patients with documented hyperkalemia or hypocalcemia, as empirical calcium boluses in normocalcemic non-hypovolemic arrest offer no benefit and may impair tissue perfusion.
Vetinuity is a clinical assistant built by Brian Toncray, an emergency veterinarian, to provide evidence-based treatment options with citations, perform rapid dose calculations, and generate concise patient record summaries for acute canine and feline emergencies.
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A 10 percent calcium gluconate solution contains one-third the elemental calcium of a 10 percent calcium chloride solution (3:1 dose ratio). When administered at equivalent elemental calcium doses (14 to 42 mg/kg calcium gluconate), both salts produce identical rises in ionized calcium and equivalent cardiovascular responses without requiring hepatic metabolism.
Calcium gluconate antagonizes hyperkalemia-induced membrane hyperexcitability, protecting against fatal cardiac arrhythmias. Prompt administration alongside intravenous fluids and unobstruction reduces serum potassium by a median of 29 percent within 4 hours, rendering additional hypokalemic agents like insulin or bicarbonate unnecessary.
Citrate anticoagulants bind ionized calcium, causing serum concentrations to drop below 1.0 mmol/L and producing tremors or arrhythmia. Continuous calcium gluconate infusions titrated to serial ionized calcium testing prevent clinical signs of citrate toxicity during therapeutic plasma exchange and plateletpheresis.
Sodium fluoroacetate toxicity in cats causes seizures, arrhythmias, and marked hypocalcemia, where calcium gluconate combined with sodium succinate increases survival to 75 percent. Accidental oral sodium phosphate ingestion in dogs also causes severe hypocalcemia and tremors, which normalize over 12 hours with intravenous calcium gluconate.
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