La maladie cardiaque la plus fréquente chez le chien (75 à 80 % des cas) est de loin la « Maladie Valvulaire Dégénérative Mitrale » (MVD).
Il s’agit d’une maladie affectant la valvule mitrale, le « clapet » qui se trouve au niveau du cœur gauche, entre l’oreillette et le ventricule. Cette valvule, dont le tissu a tendance à dégénérer avec l’âge, s’épaissit progressivement et, perdant de son élasticité, ne peut plus se fermer de façon étanche. Ce défaut de fermeture conduit à des flux sanguins anormaux à l’intérieur du cœur, que l’on nomme des « fuites » ou « régurgitations » mitrales.
Quand la maladie s’aggrave, les petits cordages reliant la valvule au ventricule gauche peuvent se rompre ; cette complication peut conduire à des œdèmes pulmonaires et d’autres complications préjudiciables pour la vie du chien.
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