5.8.2 Clinical signs
Affected foals may die in the immediate neonatal period or may survive for some months. They are usually stunted and severely exercise intolerant. They may show signs of CHF, tachypnoea and collapse. On examination, there will be a grade 4-6/6 pansystolic murmur with a PMI at the left base, also radiating to the right side. Tachycardia, weak pulses and cyanosis may be noted.