VOLUVEN(r) 6% Hydroxyethyl Starch 130/0.4 Molar substitution 0.38 - 0.45 Average Molecular weight: 110,000 - 150,000 Dalton Mean molecular weight (Mw) 130,000 Chemical name: Poly (O-2 hydroxyethyl) starch Voluven contains 60g/L of Hydroxyethyl Starch 130/0.4 and 9g/L sodium chloride (Na+ 154mmol, Cl- 154 mmol) as active ingredients.
Structural formula
O
O
1 1
O
R R R
( RO
O
OR RO O
O
OR
RO
O
O
R
O
OR O RO
O
O
OR
RO
OR
O
O )n
O
R
R = -H, -CH2CH2OH
R1 = -H, -CH2CH2OH or glucose units Chemical Abstracts Service (CAS) registry name: [9005-27-0] Hydroxyethyl Starch 130/0.4 is a white to yellowish white, odourless and tasteless, amorphous powder, readily soluble in water at room temperature, soluble in DMSO, practically insoluble in most organic solvents. Hydroxyethyl starch (HES) is a derivative of amylopectin, which is a highly branched compound of starch. In humans and animals amylopectin is rapidly hydrolysed by amylase. In order to reduce the metabolic degradation, glucose residues of the amylopectin are reacted with ethylene oxide. The hydroxyethyl groups can be introduced at three positions (C2,C3,C6) of the glucose residues. The degree of substitution and the substitution pattern expressed by the C2/C6 ratio determines the enzymatic degradation of HES. Voluven is characterised by its molar substitution, by its molecular weight and the C2/C6 ratio. Molecular weight (Mw): The molecular weight indicates the weight average and it is between 110,000 and 150,000 Dalton, which corresponds approximately to 609 to 830 partially hydroxyethylated glucose units. Molar substitution (MS): The ratio of hydroxyethyl groups to glucose units is called the molar substitution (MS). The MS for this substance is 0.4 (range 0.38 - 0.45) and determines the molar ratio of hydroxyethyl ether groups to glucose units. C2/C6 ratio: This parameter gives information about the preferred position of hydroxyethylation and reflects the different intrinsic reactivity of the secondary and the primary alcohol functionality at the respective positions of the glucose ring. The value of
Filename:VolP050713-clean Page 1 of 10 Change: Company Name change
the C2/C6 ratio should be higher than 8.
Voluven 6% in isotonic sodium chloride solution is colourless and clear. Other excipients include sodium hydroxide, hydrochloric acid and water for injections. The solution is slightly acidic (pH 4.0-5.5).
Pharmacodynamics
Voluven is an artificial colloid for volume replacement whose effect in intravascular volume expansion and haemodilution depends on the molar substitution by hydroxyethyl groups (0.4), the mean molecular weight (130,000 Da), the concentration (6%), the degree of substitution (C2/C6 ratio) of approx. 9:1 as well as the dosage and infusion rate. Infusion of 500 mL Voluven in 30 minutes in volunteers results in a plateau-like non- expansive volume increase of approximately 100% of the infused volume which lasts for approximately 4 to 6 hours. Isovolaemic exchange of blood with Voluven maintains blood volume for at least 6 hours.
Pharmacokinetics
The pharmacokinetics of hydroxyethyl starch is complex and depends on the molecular weight and mainly on the molar substitution degree. When applied intravenously, molecules smaller than the renal threshold (60,000-70,000 Da) are readily excreted in the urine while larger ones are metabolised by plasma -amylase before the degradation products are renally excreted. The mean in vivo molecular weight of Voluven in the plasma is 70,000-80,000 Da immediately after infusion and remains above the renal threshold throughout the therapeutic period. The volume of distribution is about 5.9 litres. Within 30 minutes of infusion the plasma level of Voluven is still 75% of the maximum concentration. After 6 hours the plasma level has decreased to 14%. Following a single dose of 500 mL hydroxyethyl starch plasma levels almost return to baseline after 24 hours. Plasma clearance was 31.4 mL/min when 500 mL of Voluven was administered, with an AUC of 14.3 mg/mL/h, which shows non-linear pharmacokinetics. Plasma half- lives were t1/2=1.4h and t1/2=12.1h when 500 mL were administered on a single occasion. Using the same dose of 500 mL in subjects with stable mild to severe renal impairment, the AUC moderately increased by a factor of 1.7 (95% confidence limits 1.44 and 2.07) in subjects with ClCr < 50 ml/min compared to > 50 ml/min. Terminal half life and peak HES concentration were not affected by renal impairment. At ClCr >= 30 ml/min, 59% of the drug could be retrieved in the urine, vs 51 % at ClCr 15 to 30 ml/min. Plasma levels of Voluven returned to baseline levels 24 hours following infusion.
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No significant plasma accumulation occurred even after a daily administration of 500 mL of a 10% solution to volunteers containing HES 130/0.4 over a period of 10 days. In an experimental model in rats using repetitive doses of 0.7 g/kg BW per day of Voluven over 18 days, 52 days after the last administration tissue storage was 0.6% of the total administered dose. There are no data available for the use of Voluven in dialysis.
In 21 randomised controlled clinical trials a total of 1315 subjects have been studied; 768 receiving Voluven and 547 receiving another colloid or crystalloid solution. These trials have been conducted in order to evaluate the efficacy and safety of Voluven. Adult and paediatric surgical patients and ICU patients treated for volume replacement make up 705 subjects (355 receiving Voluven). The patient population of the primary efficacy clinical studies (clinical settings of volume replacement therapy) included various types of surgery (orthopaedic, urologic, cardiac, paediatric and aortic surgery), trauma, intensive care, situations in which hypovolaemia is treated (pre-, intra-, and postoperative) or prevented (autologous blood donation, acute normovolaemic haemodilution). The comparators for these controlled studies were HES 200/0.5, HES 450/0.7 (hetastarch), gelatin, human serum albumin and crystalloids. 197 patients received infusions from 30 to > 50 mL/kg of Voluven. This dose range is supported by experience in the published literature. Analysis of coagulation parameters revealed significant differences between Voluven and HES 200/0.5: significantly higher levels of von Willebrand factor, Factor VIII, and Ristocetin cofactor with Voluven compared to HES 200/0.5. Furthermore, there were reduced blood loss and transfusion requirements in the Voluven-treated patients compared to the HES 200/0.5 treated patients. Clinical trials demonstrated comparable efficacy of Voluven with the control colloids to maintain or restore haemodynamics as shown by comparable volume of colloid administration (primary efficacy endpoint) and similar stabilisation of haemodynamics (secondary endpoints). There was no difference in mortality between groups. Regarding safety, Voluven proved to be at least as safe as the comparators. Published clinical trials conducted in elderly populations have included two studies in which 90 elderly patients (age range 70 to 86 years) were studied. In both trials, the analysed kidney function did not differ between Voluven and gelatin or human albumin. No specific dosage adjustments were required in these elderly patients. Of the total number of patients in clinical trials of Voluven (n=471), 25% were 65 to 75 years old, while 7% were 75 and older. No overall differences in safety or effectiveness were observed between these subjects and younger subjects. Other reported experience has not identified specific risks for the application of Voluven in this patient group.
Therapy and prophylaxis of hypovolaemia.
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Voluven should not be used, if any one or more of the following clinical conditions apply:
Fluid overload (hyperhydration), especially in cases of pulmonary oedema and congestive cardiac failure
Renal failure with oliguria or anuria
Patients receiving dialysis treatment
Intracranial bleeding
Severe hypernatraemia or severe hyperchloraemia
Known hypersensitivity to hydroxyethyl starches
Patients with sepsis
Patients with severe liver disease
Fluid overload caused by overdose should be avoided in general particularly for patients with cardiac insufficiency or severe kidney dysfunctions. The increased risk of hyperhydration must be taken into consideration; posology must be adapted.
In cases of severe dehydration a crystalloid solution should first be given.
Particular care must be taken in patients with severe liver disease or severe bleeding disorders, e.g. von Willebrand's disease. With the administration of Voluven, disturbances of blood coagulation beyond dilution effects can occur depending on the dosage. Discontinue Voluven at the first signs coagulopathy. Be vigilant concerning coagulation status in patients undergoing open heart surgery in association with cardiopulmonary bypass.
In critically ill patients, crystalloids should be used primarily, and Voluven should only be used, if crystalloids are not sufficient to stabilize the patient, and if the anticipated benefit justifies the risks. In critically ill patients, dose reduction should be considered depending on the actual needs of the patient and the severity of the patient's conditions. The lowest possible effect dose should be given.
It is important to supply sufficient fluid and to regularly monitor kidney function and fluid balance. Discontinue use of HES at the first sign of renal injury. A need for renal replacement therapy has been reported up to 90 days after HES administration. Continue to monitor renal function for at least 90 days in any case of deterioration of renal function.
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Serum electrolytes should be monitored.
There is limited experience on the use of Voluven in children. In non-cardiac surgery of children below 2 years of age, the tolerability of Voluven administered perioperatively was comparable to 5% albumin. Voluven should only be given to premature infants and newborns only after careful risk/benefit evaluation. Regarding the occurrence of anaphylactoid reactions please refer to "ADVERSE REACTIONS".
Use in pregnancy (Category B3)
No clinical data are currently available on the use of Voluven during pregnancy. Studies in pregnant rats and rabbits showed that the type of hydroxyethyl starch present in Voluven was associated with embryofoetal toxicity following IV administration at 5g/kg/day. The embryofoetal toxicity included resorption, stillbirths, reduced foetal weight and delayed foetal development. Voluven should not be used during pregnancy, unless the expected therapeutic benefit clearly outweighs the potential risk to the foetus.
Use in lactation
There are currently no clinical data on the use of Voluven in breast-feeding women. A study in lactating rats showed that the type of hydroxyethyl starch present in Voluven was associated with decreased postnatal growth and development following IV administration at 5g/kg/day. It is not known whether the hydroxyethyl starch is excreted into human milk. As many drugs are excreted into human milk, Voluven should not be used in breast-feeding women.
Use in the elderly
Clinical experience (including published trials) has included elderly populations, some exclusively with patients of 70 years and above. Dose reduction was not required and safety has been comparable to control treatments (gelatin or albumin) in elderly patients.
Carcinogenicity, Mutagenicity and impairment of Fertility
The carcinogenic potential of Voluven has not been investigated in animals. In vitro genotoxicity studies revealed no evidence for mutagenicity or clastogenicity for the type of hydroxyethyl starch present in Voluven. An in vivo chromosomal aberration study in rats was also negative at the tested dose of 5g/kg/day IV. No study has been conducted in animals to examine the potential effects of Voluven on fertility.
Interaction with other drugs
No interactions with other drugs or nutritional products are known to date. Please refer to "ADVERSE REACTIONS" concerning the concentration of serum amylase which can rise during administration of hydroxyethyl starch and can interfere with the diagnosis of pancreatitis.
Effects on ability to drive and use machines
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Not applicable.
Medicinal products containing hydroxyethyl starch may rarely lead to anaphylactoid reactions (hypersensitivity, mild influenza-like symptoms, bradycardia, tachycardia, bronchospasm, non-cardiac pulmonary oedema). In the event of an intolerance reaction occurring, the infusion should be discontinued immediately and the appropriate emergency medical treatment initiated. Prolonged administration of high doses of hydroxyethyl starch commonly causes pruritus (itching) which is a known undesirable effect of hydroxyethyl starches. Commonly, the concentration of serum amylase can rise during administration of hydroxyethyl starch and can interfere with the diagnosis of pancreatitis. At high dosages the dilution effects may result commonly in a corresponding dilution of blood components such as coagulation factors and other plasma proteins and a decrease in haematocrit. With the administration of Voluven disturbances of blood coagulation beyond dilution effects can occur rarely depending on the dosage.
Table: Frequency of occurrence of Adverse Drug Reactions
| System Organ Class | Adverse Drug Reaction | Frequency of Occurrence |
| Blood and lymphatic system disorders | Coagulation disorders beyond dilution effects | Rare ( in high doses ) (>0.01% to <=0.1%) |
| Immune system disorders | Anaphylactoid reactions | Rare (>0.01% to <=0.1%) |
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|---|---|---|
| Skin and subcutaneous tissue disorders | Pruritus | Common ( dose dependent ) (>=1% to < 10%) |
| Investigations | Increase of serum amylase | Common ( dose dependent ) (>=1% to < 10%) |
| Decrease of haematocrit | Common ( dose dependent ) (>=1% to < 10%) | |
| Decrease of plasma proteins | Common ( dose dependent ) (>=1% to < 10%) | |
For intravenous infusion. The initial 10-20 mL are to be infused slowly, keeping the patient under close observation (due to possible anaphylactoid reactions). The daily dose and rate of infusion depend on the patient's blood loss, on the maintenance or restoration of haemodynamics and on the haemodilution (dilution effect). Up to 50mL of Voluven per kg of body weight per day (equivalent to 3g hydroxyethyl starch and 7.7 mmol sodium per kg of body weight). This dose is equivalent to 3500mL of Voluven for a 70kg patient. The majority of clinical trial data stem from a maximal dose of up to 33mL/kg/day. Hepatic and renal monitoring is necessary at higher doses. For dosage in critically ill patients please refer to PRECAUTIONS. Voluven can be administered repetitively over several days according to the patient's needs. The duration of treatment depends on the duration and extent of hypovolaemia, the haemodynamics and on the haemodilution.
Treatment of children
There is limited clinical data on the use of Voluven in children available. In 41 children including newborns to infants (< 2 years), a mean dose of 16 9 mL/kg was administered safely and well tolerated for stabilisation of haemodynamics. (See section: PRECAUTIONS). The dosage in children should be adapted to the individual patient colloid needs, taking into account basic disease, haemodynamics, and hydration status. Voluven should only be given to children after careful risk/benefit assessment of the individual patient.
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Instructions for use/handling
Use in one patient on one occasion only. Contains no antimicrobial preservatives. Discard any unused solution. To be used immediately after the bottle or bag is opened. Use only clear solution and undamaged containers.
Incompatibilities
The mixing with other drugs should be avoided.
SPECIAL HANDLING INSTRUCTIONS
Check the expiry date and the solution for visible particles or cloudiness, do not use unless the solution is clear. Inspect the container for damage or leakage, if damaged do not use.
Using the pre-cut corner tabs, peel open and remove the over-wrap.
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Identify the blue infusion (administration) port. Use the BLUE port only to administer solution. Never use the white port.
Break off the blue tamper-evident cover from the freeflex(r) blue infusion port.
Close roller clamp. Insert the spike until the clear plastic collar of the port meets the shoulder of the spike. Use a non-vented standard infusion set and close air inlet. Hang the bag on the infusion stand. Press drip chamber to get fluid level. Prime infusion set. Connect and adjust the flow rate.
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Do not remove the freeflex(r) IV container from its overwrap until immediately before use.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.
Do not administer unless the solution is clear, free from particles and the freeflex(r) IV container is undamaged.
Voluven should be used immediately after insertion of the administration set.
Use the BLUE port only to administer solution. Never use the white port.
Do not vent.
If administered by pressure infusion, air should be withdrawn or expelled from the bag through the medication/administration port prior to infusion.
Discontinue the infusion if an adverse reaction occurs.
It is recommended that administration sets are changed at least once every 24 hours.
For single use only. Discard unused portion.
As with all volume substitutes, overdose can lead to overloading of the circulatory system (e.g. pulmonary oedema). In this case the infusion should be discontinued to allow the blood volume to decrease, primarily by loss of fluid to the urine.
Store below 25degC. Do not freeze.
AUST
R 120276
Glass bottles 250 mL (Cartons of 10 bottles)
AUST R 120358 Glass bottles 500 mL (Cartons of 10 bottles) AUST R 120359 Freeflex(r) bags with overwrap 250 ml (Cartons of 20/30/35/40 bags) AUST R 120361 Freeflex(r) bags with overwrap 500 mL (Cartons of 15/20 bags)
Fresenius Kabi Australia Pty Limited 964 Pacific Highway Pymble NSW 2073 Australia Tel: (02) 9391 5555 Fresenius Kabi New Zealand Limited 60 Pavilion Drive Airport Oaks, Auckland 2022 New Zealand Freecall: 0800 144 892
Australia: Not Scheduled New Zealand: General Sale Medicine DATE OF TGA APPROVAL: 6th November, 2006 Date of most recent amendment: 12 July 2013
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