La maladie cardiaque la plus frรฉquente chez le chien (75 ร 80 % des cas) est de loin la ยซ Maladie Valvulaire Dรฉgรฉnรฉrative Mitrale ยป (MVD).
Il sโagit dโune maladie affectant la valvule mitrale, le ยซ clapet ยป qui se trouve au niveau du cลur gauche, entre lโoreillette et le ventricule. Cette valvule, dont le tissu a tendance ร dรฉgรฉnรฉrer avec lโรขge, sโรฉpaissit progressivement et, perdant de son รฉlasticitรฉ, ne peut plus se fermer de faรงon รฉtanche. Ce dรฉfaut de fermeture conduit ร des flux sanguins anormaux ร lโintรฉrieur du cลur, que lโon nomme des ยซ fuites ยป ou ยซ rรฉgurgitations ยป mitrales.
Quand la maladie sโaggrave, les petits cordages reliant la valvule au ventricule gauche peuvent se rompre ; cette complication peut conduire ร des ลdรจmes pulmonaires et dโautres complications prรฉjudiciables pour la vie du chien.
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