DISPLASIA VALVAR TRICÚSPIDE EM MICROPIG (SUS SCROPHA DOMESTICA)

Tricuspid valve dysplasia consists of morphological changes in the valve cusps, chordae tendineae and papillary muscles, which may present greater amplitude between these structures. It stands out as a common congenital heart disease in felines and rarely found in dogs. In large pigs, few reports are found in the literature about this valve agenesis, and no reports are found in pigs classified as micropigs. A retrospective study carried out by F.S. Hsu and S.J. Du in Taiwan, identified among 1,906 necropsied pigs, 83 animals that had some congenital heart disease, with 42 (34%) of the animals affected by tricuspid dysplasia. In the fetal age of pigs, the atrioventricular valves complete their formation at 42 days of life, ceasing to be thick and becoming increasingly thinner. The characteristics of right atrioventricular valve malformation in pigs are similar to those in humans and small animals such as dogs and cats, with irregular thickening of the leaflets being observed; fixation of deformed leaflets to the ventricular wall; chordae tendineae absent or short, robust and fused. The objective of this work is to report the tricuspid anomaly in a micropig and its clinical repercussions on the species.