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Fig. 1 | BMC Anesthesiology

Fig. 1

From: Reduction of leakage from insertion site during continuous femoral nerve block with catheter-through-needle versus catheter-over-needle technique for postoperative analgesia after total knee arthroplasty: a randomized controlled trial

Fig. 1

Catheter insertion site 48 h after the start of continuous femoral nerve block. A: No leakage. White filter paper was not dyed at all. B: The filter paper was completely dyed blue and the soaked paper was torn. The leakage could be identified easily by adding indigo carmine to local anesthetics

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