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.

	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	↓	↓