Disorder - Conotruncal Heart MalformationsOrgan Systems Involved
Conotruncal Heart Defects
Conotruncal defect refers to a group of malformations of the heart, all of which are related to the heart's central dividing wall and/or the major blood vessels that carry blood out of the heart to either the lungs or the general circulation.
Conotruncal heart malformations are the most common form of heart defect in dogs. The location of the abnormality in the dividing wall, and the heart structures involved, will create different syndromes that have similar presenting signs. Pulmonic stenosis (for more detail see MIA 000842, 001038) causes a pot-bellied appearance due to fluid retention in the abdomen and an enlarged liver. Fluid accumulation in the hindlegs may also be seen. Affected dogs may show signs of reduced ability to exercise, difficulty breathing and stunted growth. Ventricular septal defect (for more detail see MIA 001041) also causes a pot-bellied appearance, with fluid retention and an enlarged liver. Affected dogs will pant a lot and will have trouble breathing. Other signs are weakness and weight loss, and these dogs may have difficulty exercising. If the condition progresses the blood may bypass the lungs so oxygen cannot be absorbed sufficiently. The gums may be bluish due to the resulting low blood oxygen levels. Tetralogy of Fallot is the third defect (for more detail see MIA 000994). Affected animals have severely stunted growth. Their blood cannot carry sufficient oxygen, and this is seen as bluish gums. There will be difficulty breathing, and this worsens with exercise.
Velocardial Facial Syndrome
Conotruncal Anomaly Face Syndrome
Subclinical Defects of the Conus Septum
Conal Ventricular Septal Defect
Persistent Truncus Arteriosus
Conotruncal Heart Malformations
Further Reference Material [OMIA Number]