Hypomagnesemia in hospitalized horses

Area of Science:

• Veterinary Medicine
• Equine Health
• Clinical Pathology

Background:

• Hypomagnesemia (low serum magnesium) is a recognized clinical finding in horses.
• Identifying associated risk factors is crucial for understanding its prevalence and impact on equine health.

Purpose of the Study:

• To investigate signalment and clinical variables linked to hypomagnesemia in horses.
• To analyze the relationship between hypomagnesemia and diagnoses, hospitalization duration, and outcomes.

Main Methods:

• A nested case-control study was performed using data from horses at a veterinary teaching hospital (1999-2001).
• Logistic regression models assessed associations between hypomagnesemia and various clinical factors.
• Serum total magnesium concentrations were analyzed for 823 horses.

Main Results:

• 48.7% of horses exhibited hypomagnesemia, more prevalent in those over one month old.
• Adult horses with colic, diarrhea, gastrointestinal disease, infectious respiratory disease, or multiorgan system disease showed increased odds of hypomagnesemia.
• Foals with diarrhea (excluding septic) had decreased odds of hypomagnesemia.
• Hypomagnesemia was not associated with overall mortality but was linked to longer hospitalization in survivors.
• Horses with colic and hypomagnesemia had a lower mortality risk compared to those with colic and normal/high magnesium.

Conclusions:

• Hypomagnesemia is common in horses presenting with specific diseases, particularly gastrointestinal and respiratory conditions.
• While not a direct cause of death, hypomagnesemia may indicate a more severe clinical state, potentially increasing hospitalization duration.
• Further research into the specific mechanisms and management of hypomagnesemia in horses is warranted.