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A study of the use of radiological pelvimetry in a Chinese population
1Department of Obstetrics and Gynaecology, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin.
Background:
To audit the use of radiological pelvimetry in a teaching obstetric unit in a Chinese population.
Methods:
A prospective observational study included all radiological pelvimetries performed in one obstetric unit over 8 months. All pelvimetries were assessed by one of the authors, and the outcome of pregnancy was reviewed.
Results:
Among 5576 women delivered in that period, 298 (5.3%) had a pelvimetry. The anteroposterior diameter of the outlet (APO) was on average 9.3 mm smaller than the obstetric conjugate (OC), and was below the definition of pelvic contraction in more than 70% of cases. Previous Cesarean sections accounted for 90.9% of the antenatal radiological pelvimetries. The result of this investigation affected the clinical management in more than 80% of these patients. The chance of successful vaginal delivery was directly related to the pelvic dimensions.
Conclusions:
Radiological pelvimetry may provide additional information which could facilitate the counseling of patients with a history of previous Cesarean section.