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The present study investigates the population of β 2 -receptors on lymphocytes in pregnant women with premature labor between the 29 th  and 34 th  week of pregnancy. The population of receptors on lymphocytes correlates with that on the myometrium, which is not accessible for study during pregnancy. Fourteen patients received a pulsatile tocolysis, while ten women received a continuous tocolysis with Fenoterol. Assuming an equal population of receptors in both groups before commencement of therapy, the numbers of receptors in the patients with continuous tocolysis fell to about 35% of the initial value after 72 hours. Under pulsatile tocolysis, the numbers of receptors remained unchanged for a period of three days and was still only just below 70% of the initial value by the seventh day.

Behaviour of β2-adrenoceptors on lymphocytes under continuous and pulsatile tocolysis with Fenoterol