An interventricular septal defect, pulmonary stenosis and bicuspid pulmonary valve in a Welsh pony foal.

The study presents a case of a Welsh pony foal who was suffering from heart issues including an interventricular septal defect, pulmonary stenosis and a bicuspid pulmonary valve. The diagnosis was confirmed by autopsy after the foal presented with symptoms such as poor exercise tolerance, a loud pansystolic murmur, and a precordial thrill.

Signs and Symptoms

• The research mentions the poor exercise tolerance of the pony, depicting its difficulty in exerting physical effort due to the cardio-pulmonary issues.
• The animal also presented a symptom called a ‘precordial thrill’, a tactile sensation analogous to a cat’s purring, felt on the chest wall over the heart, typically caused by severe heart disease.
• Characteristic signs of the pony’s condition were a loud pansystolic murmur – a sign of turbulent blood flow in the heart, mostly heard during the whole of the systole (contraction phase of the heart cycle).

Diagnostic Measures

• Blood pressure and oxygen tension values were taken during a procedure called cardiac catheterization. These values often help to diagnose the cardiac functioning of the patient.
• Cardiac catheterization involves threading a thin tube called a catheter through an artery or vein in the groin, arm, or neck until it reaches the heart. In this case, it would have helped to ascertain the functioning and structure of the pony’s heart.

Confirming the Diagnosis

• The diagnosis was ultimately confirmed after an autopsy or post-mortem examination. This indicates that the animal died, and then an examination of its body was conducted to establish the precise cause of death, providing a definitive confirmation of the earlier suspicion.
• The autopsy evidently revealed the existence of several interrelated cardiac problems: an interventricular septal defect (a hole in the wall separating the two ventricles of the heart), pulmonary stenosis (a condition where the flow of blood from the right ventricle of the heart to the pulmonary artery is obstructed), and a bicuspid pulmonary valve (a condition where the pulmonary valve in the heart has only two leaflets instead of the usual three).