Surgical management of a double‐chambered right ventricle and chylothorax in a Labrador retriever

Abstract

A 22-month-old, male Labrador retriever was presented with anorexia, dyspnoea, and fainting. The dog was diagnosed with a double-chambered right ventricle and tricuspid valve dysplasia using echocardiography and cardiac catheterisation. A marked bilateral pleural effusion was also present and chemical analysis of the fluid confirmed the diagnosis of chylothorax. Using echocardiography, a pressure gradient of 87.1 mmHg was found between the proximal and distal chambers of the double-chambered right ventricle. Initiation of cardiopulmonary bypass allowed the anomalous muscle bundle that divided the right ventricle into two chambers to be resected via a right ventriculotomy. The fainting completely resolved postoperatively, and this treatment seemed quite effective in the reduction of pressure overload ascribable to ejection disturbance. Because the tricuspid dysplasia was not corrected in the first operation, the postoperative chyle effusion was reduced but did not cease. A combination of thoracic duct ligation and passive pleuroperitoneal shunting was effective in the resolution of the chyle effusion.

Balloon dilation of an imperforate cor triatriatum dexter in a Golden Retriever with concurrent double-chambered right ventricle and subsequent evaluation by cardiac magnetic resonance imaging

“…10,12 This case showed the typical features evident both on echocardiography and CMR with the fibromuscular diaphragm separating the proximal right ventricle from its infundibulum, resulting in a fixed right ventricular outflow tract obstruction. 12,13 Although DCRV may be associated with other congenital defects 12,14,15 to the authors' knowledge, it has not previously been described with CTD in any species.…”

Efficacy of open patch‐grafting under cardiopulmonary bypass for pulmonic stenosis in small dogs

“…CPB 16,18–22 enables the maintenance of cardiac arrest for more than 60 mins, with satisfactory recovery in healthy Beagle dogs. In Japan, PS is often diagnosed in toy dogs such as the Pomeranian and Shih Tzu, and we have developed an artificial heart–lung machine especially for dogs of this size.…”

Surgical correction of a double‐chambered right ventricle under cardiopulmonary bypass

“…The defect leads to hypertrophy of the inflow portion but not the outflow portion of the right ventricle (Orton 2012). Surgical correction under cardiac bypass has been performed in a patient that was complicated with chylothorax and tricuspid dysplasia (Tanaka and others 2006). The main presenting sign was syncope, which resolved post surgery.…”