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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.

From: Combination of contrast with stress echocardiography: A practical guide to methods and interpretation

  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