“…Retention is commonly treated with oxytocin injections [3][4][5]. However, this is based on the assumption that the main cause of retention is secondary atony of the uterus (myometrial fatigue after expelling the neonate) [6][7][8][9][10][11][12] and this treatment sometimes fails [2,4,7,9]. This may be because stimulation of myometrial contractions depends more on the number of oxytocin receptors than on oxytocin dose [13,14].…”