nobog
Well-known member
Here's the problem with valve mismatch -
Mechanical valves open the same every time and one valve is the same as the next, so all anybody needs to do is to look up the pressure drop (or EOA) in a technical paper and have at it.
Tissue valves are a different story. Each one is different. There will be a difference in pressure drop from one to another. In some cases it could be a 100% difference (i.e. 10mmHg vs 20mmHg). Tissue properties and assembly can make a significant difference.
Pericardial valves will typically have a lower variation than porcine valves. One cannot tell how "good" a valve opening will be by looking at the valve, this must be measured in a pulse duplicator or similar.
Mechanical valves open the same every time and one valve is the same as the next, so all anybody needs to do is to look up the pressure drop (or EOA) in a technical paper and have at it.
Tissue valves are a different story. Each one is different. There will be a difference in pressure drop from one to another. In some cases it could be a 100% difference (i.e. 10mmHg vs 20mmHg). Tissue properties and assembly can make a significant difference.
Pericardial valves will typically have a lower variation than porcine valves. One cannot tell how "good" a valve opening will be by looking at the valve, this must be measured in a pulse duplicator or similar.