Beevers D G, Morton J J, Tree M, Young J
Gut. 1975 Jan;16(1):36-41. doi: 10.1136/gut.16.1.36.
Rectal potential difference (pd) is directly related to the plasma aldosterone concentration, and rises when aldosterone is stimulated by sodium deprivation. However, when the measurement of rectal pd was tested at a screening test for hyperaldosteronism in 19 hypertensive subjects, four of the eight with primary hyperaldosteronism had a normal pd and four of the eight without aldosterone excess had an abnormally raised potential difference. The technique cannot therefore be recommended as a routine screening test for hyperaldosteronism. No relationship was found between rectal pd and hypertension associated with excess of deoxycorticosterone. Rectal pd rises in response to the mineralocorticoid-like agent carbenoxolone.
直肠电位差(pd)与血浆醛固酮浓度直接相关,当因缺钠刺激醛固酮时其会升高。然而,在对19名高血压患者进行的原发性醛固酮增多症筛查试验中检测直肠pd时,8名原发性醛固酮增多症患者中有4名的pd正常,而8名无醛固酮增多的患者中有4名的电位差异常升高。因此,该技术不能作为原发性醛固酮增多症的常规筛查试验。未发现直肠pd与脱氧皮质酮过多相关的高血压之间存在关联。直肠pd会因盐皮质激素样药物甘珀酸而升高。