| Type |
Description |
| Silent PDA |
Less than 1.5 mm and no murmur |
| Very small PDA |
≤ 1.5 mm with audible murmur |
| Small PDA |
1.5-3 mm and murmur |
| Moderate PDA |
3-5 mm and murmur |
| Large PDA |
>5 mm and murmur |
Size is determined by minimal ductal diameter on lateral cineangiographic view; PDA, Patent ductus arteriosus |