Table 2 Relationship between stenosis severity and stress on capillary pressure, myocardial blood volume and red cell velocity. Arbitrary numbers given for illustrative purposes only.
| Â | Distal coronary artery pressure | Arteriolar resistance | Pre-capillary pressure | Trans-capillary pressure | RBC velocity | MBV |
|---|---|---|---|---|---|---|
No stenosis REST | 90 mm Hg | Normal 45 mmHg | 45 mmHg | 30 mmHg | Normal | Normal |
No stenosis STRESS | 90 mm Hg | ↓ Maximal 25 mmHg | 65 mmHg | 30 mmHg | ↑ | ↑ |
Stenosis REST | 75 mm Hg | ↓ Sub-maximal 30 mmHg | 45 mmHg | 30 mmHg | Normal | Normal |
Stenosis STRESS | 60 mm Hg | ↓ Maximal 25 mmHg | 35 mmHg | 30 mmHg | ↓ | ↓ |