Methylene blue and peritoneal dialysis

To the Editor: I have read with interest the case presented by Wu et al.1 regarding urinary bladder perforation after implantation of a peritoneal dialysis (PD) catheter. The colored picture showing methylene blue in the effluent dialysate in the PD bag is quite impressive for the general practitioner, but nephrologists involved in the field of PD may express several objections regarding this approach.