Atrial septal defect (sinus venosus type) in a dog

Area of Science:

• Veterinary Cardiology
• Congenital Heart Disease in Canines

Background:

• Congestive heart failure in dogs can stem from congenital defects like atrial septal defects.
• Pulmonary hypertension often complicates the management and surgical consideration of atrial septal defects.

Observation:

• A 2-year-old Old English Sheepdog presented with right-side congestive heart failure, including pericardial and pleural effusions, ascites, and elevated pulmonary wedge pressure.
• Cardiac catheterization and angiography confirmed an atrial septal defect, but surgery was initially deferred due to pulmonary hypertension.

Findings:

• Surgical correction of the atrial septal defect was performed due to inadequate medical management of heart failure.
• Postoperative complications included thrombocytopenia, leading to bleeding, oliguria, and pulmonary edema.
• Despite interventions, the dog succumbed to complications 24 hours after surgery.

Implications:

• This case highlights the risks associated with surgical intervention for atrial septal defects in the presence of pulmonary hypertension.
• Management of postoperative coagulopathy and organ dysfunction remains critical in complex cardiac surgeries.
• Further research into optimal timing and surgical strategies for canine atrial septal defects is warranted.