Haemorrhage
Post-operative haemorrhage was reported as a complication in 8 studies(12,16,18-19,21,25-27) with a total of 28 patients in the PNN arms giving an overall haemorrhage rate of 1.6%. The haemorrhage rates in these studies were 0.006%(12), 1.78%(19), 3.9%(25,27), 9%(21), and 28%(18) with return to theatre rates ranging from 0.006%(12) to 2.4%(25).