Percutaneous balloon angioplasty as a treatment for cor triatriatum sinister in a cat
Insights
Percutaneous transseptal balloon dilatation successfully treated feline cor triatriatum sinister, relieving congestive heart failure. However, restenosis occurred nine weeks post-procedure, indicating a need for further research.
Area of Science:
- Veterinary Cardiology
- Interventional Cardiology in Small Animals
Background:
- Congestive heart failure in cats can be caused by congenital heart defects like cor triatriatum sinister.
- Medical management of this condition often proves insufficient, necessitating advanced interventions.
Observation:
- A 17-week-old cat with symptomatic congestive heart failure due to cor triatriatum sinister underwent percutaneous transseptal balloon dilatation.
- The procedure involved transseptal puncture and balloon angioplasty of the obstructive membrane.
- A minor, self-limiting complication of pulmonary venous puncture occurred.
Findings:
- The intervention initially resolved the pressure gradient across the cor triatriatum sinister membrane, leading to clinical improvement and discontinuation of diuretics.
- Echocardiography nine weeks post-procedure revealed restenosis of the membrane, with recurrence of congestive heart failure signs.
- The cat required reinstitution of diuretic therapy due to the restenosis.
Implications:
- Percutaneous correction of cor triatriatum sinister is a technically challenging yet feasible option for small animals.
- The potential for restenosis highlights the need for long-term monitoring and further investigation into preventative strategies.
Abstract:
A 17-week-old, 2.7-kg cat was presented for management of congestive heart failure due to cor triatriatum sinister. Despite aggressive management for congestive heart failure with escalating diuretic doses, the cat remained symptomatic with exercise intolerance and dyspnea. Percutaneous transseptal balloon dilatation was scheduled. Computed tomography was performed prior to the procedure to aid in planning, which confirmed echocardiographic findings and excluded concurrent congenital defects. A transseptal puncture was performed under general anesthesia, and the cor triatriatum sinister membrane was crossed with a guidewire, allowing subsequent inflation with a 4-mm cutting balloon, followed by inflation of a 10-mm low-pressure balloon across the membrane. This resulted in marked improvement in pressure gradient across the membrane. Pulmonary venous puncture resulting in a mediastinal thrombus was the only complication encountered but was self-limiting and did not require any intervention. Diuretics were discontinued at a two-week recheck, and echocardiography confirmed resolution of the transmembrane gradient. A recheck echocardiogram nine weeks postoperatively, however, revealed restenosis of the membrane. Clinical signs of congestive heart failure were recurrent, requiring reinstitution of diuretic therapy. Percutaneous correction of cor triatriatum sinister is a technically challenging but feasible treatment option in small animals, though further investigation is needed to determine if restenosis is a common and/or preventable outcome.
