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Why are ointments contraindicated with chronic dialysis/plasma pheresis tunneled catheters?

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Why are ointments contraindicated with chronic dialysis/plasma pheresis tunneled catheters?

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Ointments containing polyethylene glycol (PEG) should not be placed on the chronic polyurethane dialysis/plasma pheresis catheters. The ointment may cause the polyurethane material to become opaque, swell and crack. PEG is a common constituent of most antimicrobial ointments (e.g. Beta dine, Bactroban, Celandine, POI, and Acu-Dyne). Swelling and cracking of catheter can potentially result in significant blood loss or air embolism.

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