Nomogram of cervical length at mid-trimester in normal thai pregnant women (2018)

Title           : Nomogram of cervical length at mid-trimester in normal thai pregnant women

Researcher       : Kovavisarach, E., Sukontaman, W.

Abstract            : Background:As cervical length decreases in the second trimester, the risk of spontaneous preterm birth increases, especially when effacement occurs early in the second trimester, and it is often detected on ultrasound examination before it can be identified by physical examination. To date, only two Thai nomograms of transvaginal cervical length have been reported.
Objective: To establish a new Thai nomogram as a reference for evaluation of transvaginal cervical length in a tertiary Thai hospital in Bangkok (Rajavithi Hospital: RH) during gestational age (GA) 16 to 24 weeks.
Material and Method: This research was approved by the ethics committee of RH (No. 055/2558). A total of 286 normal Thai pregnant women who attended the antenatal clinic (ANC) at RH between May 1, 2015 and November 30, 2015 were included. All were cases of singleton gestation with no medical or obstetric complications and no fetal congenital anomalies; and all had GA confirmed by Crown Rump Length (CRL) before GA of 14 weeks. Cervical length measurement was performed by a single operator using transvaginal ultrasonography (7.5 mHz Voluson E8) during GA of 16 to 24 weeks. The subjects attended follow-up sessions in the antenatal care clinic until delivery.
Results:One hundred and ninety-six cervical measurements were analysed (90 patients were excluded: 7 because of preterm labor, and 83 because they were lost to follow-up). The mean maternal age was 29.49+6.5 years, and the most common pregnancy status was nullipara (48.3%). The mean CL of nulliparous, multiparous and overall women were 37.87, 39.46 and 38.70 mm respectively. The CL values were constant during the examined GA.
Conclusion:The mean cervical length of normal Thai pregnant women between GA of 16 to 24 weeks examined transvaginally
was 38.70 mm.

Keywords: Cervical length (CL), Transvaginal ultrasonography

Link to Academic article: http://www.jmatonline.com/index.php/jmat/article/view/9091

Journal : Journal of the Medical Association of Thailand, 2018, 101(Suppl.2)

Bibliography     : Kovavisarach, E., & Sukontaman, W. (2018). Nomogram of cervical length at mid-trimester in normal thai pregnant women. Journal of the Medical Association of Thailand, 101(Suppl.2), S31–S37.