[Factors associated to the coiling of umbilical cord: case-control study conducted in three hospitals in Yaoundé]

The coiling of umbilical cord is the winding of the umbilical cord around a part of the fetal body once or several times. It is the most common abnormality of the cord, its prevalence varies according to the authors from 5.7% to 35.1%. In 2011, the rate of perinatal mortality due to the coiling of umbilical cord in Cameroun was 6.1%. However factors associated to it are little known in our context. Our purpose was to determine factors associated to the coiling of umbilical cord in three hospitals in Yaoundé.

We conducted an analytical case-control study in the Maternity Unit at the Central Hospital of Yaoundé, the University Teaching Hospital of Yaoundé and the Social and Health Nkoldongo Animation Center over a period of 4 months. The study-group composed of newborns with coiling of umbilical cord was compared with two control groups (newborns without coiling of umbilical cord). All the fetuses were cephalic at delivery (singleton pregnancies at term). Pre-established technical data sheets were filled with data collected and analyzed based on the Microsoft Excel 2017 and SPSS software Version 23. The parameters used for the analysis were the average age, standard deviation and frequency, the raw odds ratio (OR) and/or adjusted (aOR) with their 95% confidence interval. P was considered significant for any value less than 5.

Out of a total of 3,300 deliveries, 500 newborns (15.15%) had coiling of umbilical cord. All the coils were around the neck. We retained and studied 136 newborns with coiling of umbilical cord (study group) vs 272 newborns without coiling of umbilical cord (control group). Factors independently associated with coiling were non editable: length of the cord = 70cm (ORa = 32 CI = 17.5-35 p = 0.02), male sex (ORa = 67.09 CI = 22.31 - 97.46 P = 0.001), APGAR score 5th minute <7 (ORa =76.98 CI = 2.19 - 27.05 P=0.017) and modifiable factors were gestational age = 42WA (ORa = 15.15 CI = 6.14-18.2 P = 0.001).

The coiling of umbilical cord is a frequent cord abnormality. We suggest to the decision-makers to increase awareness among health workers and the population on the importance of ultrasound scan of the third trimester in order to detect coiling of umbilical cord and implement appropriate manage newborns. Clinicians should avoid as much as possible post-term pregnancy.