Question 323 · LEK · Abnormal head presentation
Deep transverse arrest occurs when:
- A. at full cervical dilatation the foetal head has reached the pelvic floor, the internal rotation has not been completed, the sagittal suture is in the transverse diameter of the pelvic outlet and arrest of labour occurs.
- B. at full cervical dilatation the foetal head has reached the pelvic floor, the internal rotation has not been completed, the sagittal suture is in the transverse diameter of the pelvic outlet, the posterior fontanelle presents first and the labour is prolonged.
- C. at full cervical dilatation the foetal head has reached the pelvic floor, the internal rotation has not been completed, the sagittal suture is in the oblique diameter of the pelvic outlet and prolonged labour occurs.
- D. at nearly full cervical dilatation the foetal head has reached the pelvic floor, the internal rotation has been completed, the sagittal suture is in the transverse diameter of the pelvic outlet and prolonged labour occurs.
- E. at nearly full cervical dilatation the foetal head has reached the pelvic floor, the internal rotation has not been completed, the sagittal suture is in the transverse diameter of the pelvic outlet and prolonged labour occurs.
Hint
Check three features: the degree of cervical dilatation, the orientation of the sagittal suture at the pelvic floor and the effect on labour progress.
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