Abstract
The prevention and treatment of preterm birth remains one of the biggest challenges
in obstetrics. Worldwide, 11% of all children are born prematurely with far-reaching
consequences for the children concerned, their families and the health system. Experimental
studies suggest that progesterone inhibits uterine contractions, stabilises the cervix
and has immunomodulatory effects. Recent years have seen the publication of numerous
clinical trials using progestogens for the prevention of preterm birth. As a result
of different inclusion criteria and the use of different progestogens and their methods
of administration, it is difficult to draw comparisons between these studies. A critical
evaluation of the available studies was therefore carried out on the basis of a search
of the literature (1956 to 09/2018). Taking into account the most recent randomised,
controlled studies, the following evidence-based recommendations emerge: In asymptomatic
women with singleton pregnancies and a short cervical length on ultrasound of ≤ 25 mm
before 24 weeks of gestation (WG), daily administration of vaginal progesterone (200 mg
capsule or 90 mg gel) up until 36 + 6 WG leads to a significant reduction in the preterm
birth rate and an improvement in neonatal outcome. The latest data also suggest positive
effects of treatment with progesterone in cases of twin pregnancies with a short cervical
length on ultrasound of ≤ 25 mm before 24 WG. The study data for the administration
of progesterone in women with singleton pregnancies with a previous preterm birth
have become much more heterogeneous, however. It is not possible to make a general
recommendation for this indication at present, and decisions must therefore be made
on a case-by-case basis. Even if progesterone use is considered to be safe in terms
of possible long-term consequences, exposure should be avoided where it is not indicated.
Careful patient selection is crucial for the success of treatment.
Key words
preterm birth - progesterone - 17α-hydroxyprogesterone caproate - cervical length