| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Premature uterine contractions premature labor
 |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| patients suffering from preterm labor or shortening of the cervix |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Female diseases of the urinary and reproductive systems and pregancy complications [C13] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 16.1 |  
| E.1.2 | Level | LLT |  
| E.1.2 | Classification code | 10068718 |  
| E.1.2 | Term | Premature uterine contractions |  
| E.1.2 | System Organ Class | 100000004868 |  | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 16.1 |  
| E.1.2 | Level | LLT |  
| E.1.2 | Classification code | 10036599 |  
| E.1.2 | Term | Premature labor |  
| E.1.2 | System Organ Class | 100000004868 |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| To evaluate the efficacy of long term tocolysis with atosiban on the pregency outcome. (Gestational age at delivery) |  | 
| E.2.2 | Secondary objectives of the trial | 
| Prolongation of pregnancy, time intervall til recurrant preterm labor, cervical length/shortening of the cervix, drop out rate 
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| intact singleton  pregnancy between 23+0 and 28+0 weeks gestation 
 intact membranes
 
 cervical length ≤ 15mm
 
 immediate previous completion of standard tocolysis with atosiban for 48 hours
 
 Able to communicate well with the investigator, to understand and comply with the requirements of the study
 
 Signed the written informed consent
 
 women over 18 years
 |  | 
| E.4 | Principal exclusion criteria | 
| rupture of membranes Amnion infection syndrome, fever (>38°C)
 vaginal bleeding with intensity of menstruation or above
 placenta praevia
 polyhydramnion
 congenital malformations, deformations and chromosomal abnormalities
 preexistant Diabetes Typ I or II
 multiple pregnancies
 Prolaps of membranes till the external cervical os.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Does a long term tocolysis with atosiban lead to a prolongation of pregancy?
 
 1.)Time ( in days) until  recurrence of preterm labor with effect on the cervical length during the study period.
 
 
 If 1 is significant:
 2.) Time untill delivery during study period.
 
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| recurrence of labor delivery
 |  | 
| E.5.2 | Secondary end point(s) | 
| gestational age at birth 
 Time period (days) after long term tocolysis ( after the end of the study period) until birth
 
 time period (days) after routine tocolysis (48hrs) until birth.
 
 Time period (days) after the study period until recurrence of preterm labor with effect on the cervical length.
 
 need for another tocolysis cycle after the study period until SSW 33+6.
 
 Delivery before gestational age  28+0, 30+0, 33+6
 
 Perinatal Mortality
 
 Perinatal Morbidity- Perinatal Morbidity composite index
 
 Side effects of the therapy (study period)
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| recurrence of preterm labor and delivery |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | Yes | 
| E.6.4 | Safety | No | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | Yes | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | No | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | Yes | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | Yes | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| End of the trial is reached as soon as the last subject had delivered the baby/ babies. |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years |  | 
| E.8.9.1 | In the Member State concerned months | 12 | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial months | 12 |