Bleeding after suction rectal biopsy with Rbi2: identification of the root cause through a multi-staged approach

Suction rectal biopsy (SRB) is a key diagnostic tool in Hirschsprung's disease. The original Noblett device has been superseded by modern alternatives including the Rbi2 rectal biopsy gun. We describe a comparison of biopsy results from the Noblett device and the Rbi2 gun and an investigation into significant post-biopsy bleeding episodes with the latter.

A retrospective review of SRB episodes between 2006 and 2014 was undertaken to audit biopsy success rates. Significant post-procedure bleeding after SRB with the Rbi2 gun prompted further investigations.

Biopsies taken with the Noblett gun were more likely to be inadequate (Noblett 82/197 (40%) vs Rbi2 77/438 (18%)). After biopsy with the Rbi2 gun, 2 infants suffered from significant bleeding requiring resuscitation, blood product support and multiple theater episodes. As there were no reported cases of bleeding with the Rbi2 gun, a report was made to the Medicines & Healthcare products Regulatory Agency who identified incorrect biopsy technique as a potential contributing factor. A questionnaire of trainees and consultants found unexpected individual variation in SRB technique, with some users applying excessive suction.

Significant bleeding occurred after SRB with the Rbi2 gun, excessive suction was thought to be the cause.