continous veno-venous hemodiafiltration

http://acronyms.thefreedictionary.com/Continuous Veno-Venous...

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Note added at 14 mins (2007-03-22 16:46:40 GMT)
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I believe CVVHD is continuous venovenous hemodialysis.
https://www.unchealthcare.org/site/Nursing/nurspractice/prot...

CRRT is defined as any extracorporeal blood purification therapy
intended to substitute for impaired renal function 24 hours/day over an extended
period of days. The most commonly cited clinical indications for CRRT are fluid
overload, metabolic acidosis, uremia, sepsis, unstable patients with renal impairment and certain drug overdoses. CRRT includes Slow Continuous Ultrafiltration (SCUF), Continuous Veno-Venous Hemofiltration (CVVH), Continuous Veno-Venous Hemodialysis (CVVHD) and Continuous Veno-Venous Hemodiafiltration (CVVHDF).

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Note added at 16 mins (2007-03-22 16:48:56 GMT)
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Hemofiltration
Main article: hemofiltration
Hemofiltration is a similar treatment to hemodialysis, but it makes use of a different principle. The blood is pumped through a dialyzer or "hemofilter" as in dialysis, but no dialysate is used. A pressure gradient is applied; as a result, water moves across the very permeable membrane rapidly, facilitating the transport of dissolved substances, importantly ones with large molecular weights, which are cleared less well by hemodialysis. Salts and water lost from the blood during this process are replaced with a "substitution fluid" that is infused into the extracorporeal circuit during the treatment. Hemodiafiltration is a term used to describe several methods of combining hemodialysis and hemofiltration in one process.

http://en.wikipedia.org/wiki/Dialysis

I'm pernickety :-)