Urethrolithiasis and nephrolithiasis in a horse.

The research investigates a case of a 9-year-old horse suffering from urinary system obstructions due to stone formations (urethrolithiasis and nephrolithiasis), which lead to severe complications and eventually the horse’s euthanization.

Case Background

• The case concerns a 9-year-old quarter horse gelding which was diagnosed with obstructive urethrolithiasis, a condition where stones (calculi) form in the urinary tract and obstruct the passage of urine.
• As an initial treatment effort, a perineal urethrostomy was performed, a surgical procedure which provides an alternative route for urine voidance by creating an opening in the perineum.

Progression of Condition and Diagnosis

• Despite the treatment, the horse’s condition worsened, prompting the veterinary team to perform an abdominocentesis, a procedure to collect fluid from the abdominal cavity for examination.
• The results of the abdominocentesis confirmed the presence of septic uroperitonitis, an infection of the urinary tract that spreads to the peritoneal cavity and fills it with pus. This pointed to a complication beyond the initial diagnosis of urethrolithiasis.

Outcome and Post-mortem Findings

• Given the severe complications, the decision was made to euthanize the horse.
• The postmortem examination revealed multiple major issues: peritonitis, indicative of an infection that had spread to the peritoneal cavity; a tear in the lateral wall of the bladder, likely causing the infection spread and further complicating the animal’s condition; and a nephrolith within the left renal pelvis, a kidney stone that may have further exacerbated the urinary obstruction originally diagnosed.

Implications of the Research

• This case gives us insight into the severity and complications of urinary obstructions in horses, highlighting the importance of an accurate and comprehensive initial diagnosis.
• The rapid deterioration of the horse’s condition despite surgical intervention underlines the potential severity of urethrolithiasis and nephrolithiasis, stressing the need for early diagnosis, prompt treatment and thorough follow-up.
• The correlation between urinary obstruction and septic uroperitonitis, an infection of the urinary tract that had spread to the peritoneal cavity, highlights the potential seriousness of urinary tract infections if left untreated or not treated adequately.