Idiopathic effusive pericarditis with tamponade in the horse.

The research article discusses a rare heart condition in horses known as idiopathic pericarditis with effusion, where the space around the heart fills with excess fluid leading to tamponade, or pressure on the heart. This was studied in 10 horses over a period of seven years.

Introduction and Context

• Pericarditis and pericardial effusion, conditions involving inflammation and excess fluid around the heart, occur rarely in horses.
• The authors of this study investigated these conditions over a seven-year period in an attempt to understand their symptoms, diagnosis techniques, and effective treatments, given the mystery surrounding the cause of these conditions (idiopathic).

Clinical Observations and Laboratory Analysis

• Physical symptoms in the affected horses included rapid heart rate (tachycardia), swelling in the lower part of body (ventral oedema), distention or engorgement of the jugular vein, and decreased heart sounds observable by a veterinarian.
• Electrocardiograms (EKG) of affected horses showed diminished voltages and electrical alternans, a pattern indicating heart instability.
• Echocardiography, a type of ultrasound for the heart, was performed in six of the horses, and all of them confirmed the presence of effusion or excess fluid.
• Analysis of pericardial fluid samples revealed different classifications, including six cases of aseptic serofibrinous, three cases of eosinophilic, and one case of histiocytic.

Treatment and Outcome

• Nine of the ten horses saw relief of clinical signs following pericardiocentesis, a procedure to remove excess fluid around the heart.
• Out of ten horses, one died, and three were euthanized. The remaining six horses recovered after one or two pericardiocentesis procedures, with or without additional corticosteroid treatment.
• The treated horses were observed to be alive for a period ranging from one month to seven years post-diagnosis, signifying the effectiveness of the treatment.