Ante-mortem diagnosis of unilateral pulmonary vein stenosis in a cat: a case report
Abstract
Background: Pulmonary hypertension (PH) detection in cats may be challenging. Pulmonary venous stenosis (PVS) is rare in cats and can lead to PH. The only reported PVS case received a post-mortem diagnosis. Imaging during the cat's lifetime established the diagnosis in this case.
Case presentation: A 2 year-old Norwegian Forest cat was diagnosed with pulmonary oedema and PH secondary to cor triatriatum sinister (CTS) and showed improved breathing following two subcutaneous furosemide treatments, 1 and 2 mg/kg, during an overnight stay at the referral veterinary hospital. Sildenafil alone (0.69 mg/kg, PO, BID) was prescribed post-discharge to address PH without diuretics. Post-discharge from the referral veterinary hospital, collapse and pre-syncope were suspected to be due to PH. Consequently, sildenafil was titrated weekly, starting at 1.09 mg/kg BID and increasing to 1.63 mg/kg BID. Pre-syncope and collapse resolved, and pulmonary opacities reduced considerably, although concerns remained that increased pulmonary blood flow to suspected CTS from sildenafil might worsen cardiogenic pulmonary oedema. The patient was also treated with rivaroxaban (2.5 mg/head, SID), considering the increased risk of thrombus formation due to blood flow stasis and endothelial damage. Thirty-eight days later, the cat presented for the first time to our hosipital (Azabu University Veterinary Teaching Hospital) for examination. On echocardiography, a continuous mosaic blood flow (maximum and…
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