Abstract
A stop solution containing EDTA, EGTA, dipyridamole, erythro-9-(2-hydroxy-3-nonyl)adenine (EHNA) and d, l-α-glycerophosphate has been used to prevent adenosine formation and loss from rat femoral arterial blood samples prepared for measurement of plasma adenosine levels. The femoral anterial plasma adenosine concentration in normoxic rats was 79.2 ± 12.7 nM. During a 5 min period of hypoxia (8% oxygen) plasma adenosine increased to 190.2 ± 32.2 nM. A resting plasma adenosine level of circa 80 nM, which is 10X lower than most previous estimates, approximates the threshold levels of adenosine required for arterial dilation.
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