Intravenous lipid emulsion therapy in 2 dogs and 2 cats with vitamin D toxicosis.

Vitamin D toxicosis can lead to severe and prolonged hypercalcemia resulting in multi-organ damage and even death. Current treatment often involves prolonged hospitalization and may require medications with potential for adverse effects. The objective of this case series was to describe reductions in serum ionized calcium concentrations following intravenous lipid emulsion therapy in vitamin D toxicosis. Two dogs and 2 cats with vitamin D toxicosis were treated with intravenous lipid emulsion therapy in addition to standard treatment regimens. Ionized hypercalcemia was lower following intravenous lipid emulsion therapy despite a more than 24-hour delay in initiating treatment in 3 of the 4 patients, and no adverse reactions were observed. Additionally, 2 of the 4 animals in this case series had long-term monitoring of 25-hydroxyvitamin D concentrations that revealed persistent elevations at 6 d in a dog and 5 mo in a cat, despite earlier resolution of their ionized hypercalcemia. Key clinical message: This is the first documented serial report of reduction of serum ionized calcium concentrations after administration of intravenous lipid emulsion, in addition to other standard therapies, in 2 dogs and 2 cats with vitamin D toxicosis. Furthermore, a chronically elevated plasma 25-hydroxyvitamin D concentration was documented in 2 of the 4 patients, including the first report in a cat. In these 2 cases, ionized calcium concentrations normalized despite persistently elevated 25-hydroxyvitamin D concentrations.