The relationship between the activities of the blood angiotensin-converting enzyme (ACE) and the site of the blood collection (radial artery, peripheral vein, left atrium) was examined in 15 patients with congenital heart diseases operated on with artificial circulation. No statistically significant differences in ACE activities in the blood from the vein, artery, or left atrium was detectable (p greater than 0.05). It is recommended that the blood for measuring ACE activity be collected from the peripheral vein.
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