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→Removal of previous catheter: What is enough
===Removal of previous catheter===
*Check the position of the previous catheter tip with a few ml of iodinated contrast(enough to delineate the renal pelvis but yet not obscuring the catheter tip), preferably in two projections such as a lateral and a more frontal one.* <br>''[[#Troubleshooting|Troubleshooting: Catheter in calyx]]''
*Loosen any pigtail
*Insert a guidewire (such as Amplatz) into the renal pelvis or proximal ureter.* <br>''[[#Troubleshooting|Troubleshooting: Cannot advance guidewire]]''
