Belzer UW® Cold Storage Solution

(UW Solution)



Belzer UW® Cold Storage Solution (UW Solution) composition is:

Pentafraction50 g/L
Lactobionic Acid (as Lactone)35.83 g/L
Potassium Phosphate monobasic3.4 g/L
Magnesium Sulfate heptahydrate1.23 g/L
Raffinose pentahydrate17.83 g/L
Adenosine1.34 g/L
Allopurinol0.136 g/L
Total Glutathione0.922 g/L
Potassiuim Hydroxide5.61 g/L
Sodium Hydroxide/Hydrochloric AcidAdjust to
pH 7.4
Water for Injectionq.s.

Belzer UW® Cold Storage Solution is a clear to light yellow, sterile, non-pyrogenic solution for hypothermic flushing and storage of organs. The solution has an approximate calculated osmolarity of 320 mOsm, a sodium concentration of 29 mEq/L, a potassium concentration of 125 mEq/L, and a pH of approximately 7.4 at 20°C.


Belzer UW® Cold Storage Solution must be cooled to 2° to 6°C (36° to 43°F) prior to use. The cold solution is used to flush the isolated organ immediately before removal from the donor and/or immediately after removal from the donor. The solution is then left in the organ vasculature during hypothermic storage and transportation. Belzer UW® Cold Storage Solution is to be used for cold storage of the organ and is not acceptable for continuous machine perfusion. Administration of Belzer UW® Cold Storage Solution, at the recommended temperature, will effectively cool the organ and lower its metabolic requirements.


Belzer UW® Cold Storage Solution is intended for the flushing and cold storage of kidney, liver and pancreas organs at the time of organ removal from the donor in preparation for storage, transportation and eventual transplantation into a recipient.


There are no known contraindications when used as directed.




The donor organ must be flushed free of the Belzer UW® Cold Storage Solution prior to the reperfusion. The organ must be flushed with physiological solution to prevent occurrence (in the recipient) of potentially serious cardiovascular complications such as hyperkalemic cardiac arrest or bradyarrhythmia. This is necessary because of the high concentration of potassium in the solution. These precautions must be taken during donor organ retrieval to avoid cardiac arrest.

Belzer UW® Cold Storage Solution includes components (allopurinol and pentafraction) which individually have caused hypersensitivity reaction in patients. Additionally, the additives recommended for use with Belzer UW® Cold Storage Solution (penicillin, insulin, and dexamethasone) have individually been associated with hypersensitivity reactions in patients. Physicians should consult individual drug labeling and be alert to treat possible reactions.


Cardiovascular complications such as bradyarrhythmia have been reported in cases where the organ has been reflushed with fresh solution within a short period (1 to 3 hours) prior to release of vascular anastomosis clamps in the recipient, or when inadequate flush-out of the solution has occurred.

A few anecdotal reports when this solution was used in liver graft preservation described clinical problems including hepatic functional changes, poor outcomes including death, and biopsies showing ischemic damage in the liver with or without signs of mild rejection.


Cool the solution to 2° to 6°C (36° to 43°F). Remove overwrap prior to use. Check each bag for leaks by squeezing the container firmly. If a leak is found, discard solution container. With the overwrap removed, perform a visual inspection of the solution for particulate matter. Do not use the solution if
obvious particulate matter, precipitates, or contamination are evident in the solution.

The following can be added aseptically to each liter of Belzer UW® Cold Storage Solution immediately before use:

  1. Penicillin G, 200,000 units per liter
  2. Regular Insulin, 40 units per liter
  3. Dexamethasone, 16 mg per liter

The use of these additives is not required but rather is at the discretion of the Organ Procurement or Transplant professional.

Glutathione, one of the components of Belzer UW® Cold Storage Solution, oxidizes during storage. If desired, an additional 0.922 g/L (3 mmole/L) of glutathione may be added if Transplant Center policy or Surgical Personnel requirements call for its use. (Boudjema et al, Transpl. Proc. 23[5]1991; Merion et al, Transpl. Proc. 23[4]1991).

Remove protective cap from the bag outlet port, designated as delivery set port. Insert the spike from the administration set into the bag port with a twisting motion. Open clamp on administration set. Hold the administration set vertically above the solution bag, then squeeze solution bag to fill
administration set. Close the clamp.

Prior to connection to the organ, the solution container should be suspended from a sufficient height to allow for a steady stream of solution and to produce flow rates of at least 30 mL/min during flushing. Open the clamp to begin flushing. Flushing should be continued until the organ is uniformly pale and
the effluent is relatively clear.


In situ aortic flush:Adults, 2 – 4 L
Infants, 50 mL/kg
Ex vivo infusion:liver (via portal vein and biliary tree)
Adults, 1200 mL
Infants, 50 mL/kg
Pancreas or Kidney:Adults, 300 – 500 mL
Infants, 150 – 250 mL


Additional solution should be dispensed into the container holding the organ. Seal the container aseptically. The organ storage container should be maintained within a well-insulated transport container. Ice should be used to surround the organ storage container, but should not be used within the container, where the ice could come into direct contact with the organ. Donor organs must be flushed free of Belzer UW® Cold Storage Solution prior to anastomosis (Refer to PRECAUTIONS Section.). In order to minimize residues of the solution in the liver, just prior to anastomosis, flush one liter of Lactated Ringer’s solution through the hepatic portal vein.


The recommended following times for each organ are:

Cold Ischemia Times

Livernot longer than 17 hours
Kidneynot longer than 23 hours
Pancreasnot longer than 21 hours

Warm Ischemia Times

Livernot longer than 2.5 hours
Kidneynot longer than 2.5 hours
Pancreasnot longer than 2.5 hours


500 mL in 500 mL bags, shelf carton of 6; 1000 mL in 1-liter bags, shelf carton of 10; 2000 mL in 2-liter bags, shelf carton of 5. Store Belzer UW® Cold Storage Solution indoors at temperatures controlled between 2° and 25°C (36° and 77°F) until use. Avoid excessive heat. Do not freeze the solution, and do
not use if frozen. Do not use if discolored or if obvious particulate matter, precipitates, or contamination are evident in the solution.

CAUTION: Federal (USA) law restricts this device to sale by or on the order of a physician.

Manufactured by:
Preservation Solutions, Inc.
1099 Proctor Drive
Elkhorn, WI 53121
(262) 723-6715
Manufactured for:
Bridge to Life Ltd.
128 Suber Road
Columbia, SC 29210-3851
(803) 545-0080

Belzer UW® is a trademark of the Wisconsin Alumni Research Foundation (WARF) used under an exclusive license granted to Bridge to Life Ltd.

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Belzer UW® Cold Storage Solution
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