[The influence of ritodrine-hcl (prepar), bunitrolol (stresson) and oxytocin (syntocinon) on Uteroplacental perfusion (author's transl)]

The administration of betamimetics has proved to be useful for symptom-oriented treatment in patients with reduced utero-placental flow. In order to quantify the betamimetic effect flow measurements were carried out in a total of 12 sheep, yielding the following experimental results: 1) Betamimetics, up to a certain point which correlates with maternal heart rate, raise the uteroplacental flow-rate. 2) The use of cardio-selective betablocker prevents undesired betamimetic side-effects but there is also a loss of the rise in utero-placental flow rate. 3) In sheep pretreated with Oxytoxin the application of betamimetics not only offsets oxytoxin-action but also greatly improves utero-placental blood flow.