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Platelet angiotensin II receptor status during pregnancy in Chinese women at high-risk of developing pregnancy-induced hypertension.

OBJECTIVES
The aims of this prospective study were to explore the changes in platelet angiotensin II (A-II) binding in pregnancy amongst Chinese women at high risk of developing pregnancy-induced hypertension (PIH) and the effects of low-dose aspirin and calcium supplementation on A-II binding.


METHODS
Platelet A-II binding was assayed in 15 non-pregnant women and in 63 pregnant women determined to be at risk of PIH on the basis of 2nd-trimester mean arterial pressure (MAP). The pregnant patients were randomized into three groups: control, low-dose aspirin, and calcium supplementation. A-II binding was assayed again during the 3rd trimester in half the women and 8 weeks after delivery.


RESULTS
A-II binding was negatively correlated with MAP measured in the left lateral position (p < 0.05) but not with MAP measured in the supine position. There were no significant differences between A-II binding in non-pregnant and pregnant women. Neither low-dose aspirin nor calcium supplementation caused significant reductions in A-II binding.


CONCLUSION
The measurement of platelet A-II binding is unlikely to provide significant information regarding the risk of PIH over and above that obtained from measurement of 2nd-trimester MAP.