kangaSue
Senior Member
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- Brisbane, Australia
Prolonged ischemia of any sort results in significant changes in the microvasculature that interferes with normal blood flow. When arteries are occluded, detrimental changes occur in the capillaries and arterioles. After relief of the occlusion, blood flow to the ischemic tissue may still be impeded in a phenomenon known as no reflow, something that has been demonstrated in studies into heart, brain, skin, skeletal muscle, intestinal tract and the kidney.The only way that HBOT would fail to deliver oxygen to narrow capillaries is if red blood cells or some other factor were somehow blocking the blood flow completely in the narrowest blood vessels.
The exact mechanism is uncertain but it is known to start during the ischemic period and then increases during reperfusion. Lactic acidosis would be a sign of this microvascular ischemia but the the liver is exceptionally efficient at clearing this from circulation.
Ischemic pre-conditioning or post-conditioning has been shown to be a beneficial conditioning tool whereby a blood pressure cuff is inflated (I think it was to no more than 50 mm Hg above your normal systolic) and deflated for 3 repetitions of five minute duration intervals. Or you could try nitrate vasodilators which aid in opening up peripheral arteries.