We thank you for your question. We are not quite sure what you mean by window dressing. If you mean keyhole dressing such as is used for around a tracheostomy tube, then it is not the usual practice to use a keyhole dressing around the PD catheter exit site.
 
The usual practice is to use standard 2×2 inch (5×5 cm) or 4×4 inch (10.2 x 10.2 cm) gauze squares for the PD catheter exit-site dressing.
 
A keyhole dressing is not recommended, since it will not immobilize the PD catheter well, can cause loose fibers from the dressing to adhere to the exit site, and the pre-cut ones are more expensive that a regular gauze dressing.