A primigravida at term has been fully dilated for 2 hours with no descent. The vertex is at 0 station in left occipito-transverse position with deep transverse arrest confirmed at the ischial spines. Contractions are adequate and the pelvis is judged adequate. Which instrument is specifically designed for rotational delivery in this situation?
- A Simpson forceps
- B Kielland forceps ✓
- C Wrigley forceps
- D Piper forceps
Correct answer: B. Kielland forceps
Explanation
Kielland forceps have minimal pelvic curvature, sliding locks and directional markers designed specifically for rotating the vertex from occipito-transverse or occipito-posterior position to occiput anterior before delivery, classically in deep transverse arrest. Simpson forceps have a marked pelvic curve suited to traction in the OA position, Wrigley forceps are short outlet instruments, and Piper forceps are specialised for the aftercoming head in breech delivery.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.