Key result
Pulmonary valve restenosis after balloon valvuloplasty is linked to extracellular matrix accumulation and myofibroblast proliferation.
Why the study?
Histopathological and immunohistochemical findings of restenotic pulmonary valve after balloon valvuloplasty in dogs with pulmonary stenosis have not been documented.
Case Report (n=1)
No
This case report provides the first documented histopathological evidence that restenosis after balloon valvuloplasty in a dog with pulmonary stenosis may be driven by myofibroblast proliferation and extracellular matrix increase.
Answers are grounded in this paper and cite their sources.
Restenosis after BV for canine PS may warrant closer long-term monitoring; single case leaves open α-SMA cell role in valve thickening.
A two-month-old female Chihuahua was diagnosed as severe pulmonary valvular stenosis (PS). Although balloon valvuloplasty (BV) was successfully performed, restenosis was observed 19 months after the procedure. Euthanasia was chosen due to low output syndrome during the surgical repair attempted when the dog was 5 years old. Postmortem examination revealed markedly thickened pulmonary valve due to the increase of extracellular matrix which might be produced by increased α smooth muscle actin-positive myofibroblasts. The thickening of the valve was associated with restriction of the valve's motion, resulting in restenosis in the present case. This is the first case report documented histopathological and immunohistochemical findings of the restenotic pulmonary valve in dogs with PS after BV.
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Sunahara et al. (2014) conducted a case report in Pulmonary valvular stenosis (n=1). Balloon valvuloplasty was evaluated on Histopathological and immunohistochemical findings of the restenotic pulmonary valve. Restenosis after balloon valvuloplasty in a dog with pulmonary stenosis was associated with marked thickening of the pulmonary valve due to increased extracellular matrix and alpha smooth muscle actin-positive myofibroblasts.
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