Arthritis Clinical Trial
Official title:
A Prospective Study to Evaluate the Effectiveness of a Haemostatic Agent in Primary Unilateral Total Hip Arthroplasty
This is a prospective, randomized, controlled, single-center study to assess the effectiveness of Vitagel, a surgical hemostat, in primary unilateral total hip arthroplasty (THA). This will be an inter-patient controlled study involving one-hundred-ten subjects. Vitagel will be used in a randomly selected cohort of fifty-five patients undergoing primary unilateral THA procedures; a control group of fifty-five patients will not receive Vitagel or any other hemostatic agent except those that are standard during a primary THA. The study will evaluate the effectiveness of Vitagel in reducing intra- and post-operative bleeding.
Vitagel Surgical Hemostat is composed of microfibrillar collagen and thrombin in combination
with autologous plasma. It is applied to the surgical site as a sprayable liquid which then
forms a collagen/fibrin gel matrix (containing the patients activated platelets) which
adheres to the bleeding site. This matrix provides hemostasis and facilitates healing.
Vitagel is resorbed in approximately 30 days. It is easily prepared by the OR staff in
minutes and only requires ~10mL's of the patient's blood per Vitagel 4.5ml kit. Compared to
other hemostatic agents on the market today, Vitagel has the advantages of not containing
pooled human donor blood proteins, aprotinin, or tranexamic acid.
Vitagel has been studied in multiple surgical specialties to demonstrate safety and
efficacy. Vitagel was studied in orthopedic procedures, both on iliac crest donor sites and
sternal edges, during its IDE studies for FDA approval. Vitagel was granted broad
indications for use by the FDA in 2000 as an adjunct to hemostasis. It was formerly marketed
under the name CoStasis® Surgical Hemostat, by Cohesion Technologies, Palo Alto, CA.
The use of a surgical hemostat in joint arthroplasty may substantially decrease
post-operative blood loss, which may reduce patient morbidity, length of hospital stay, and
costs by potentially eliminating the need for transfusions and drains.
Total Hip Arthroplasty (THA) is associated with post-operative blood loss and frequently
requires the transfusion of blood products. Increased concern over the risks of blood
transfusion, which include transmission of viral diseases, such as HIV, Hepatitis, and CMV
as well as transfusion reactions, has perpetuated the search for new methods of blood
conservation in orthopedic surgery. There exists considerable variation in the protocols
that are used to optimize hemostasis and minimize post-operative blood loss in patients
undergoing THA. Some methods used include pre-operative hemodilution and hypotensive
anesthesia; however, these methods have associated risks, require careful monitoring, and
can prolong the operative time. Another method used is intra-operative and post-operative
salvage of blood with re-infusion which requires continuous monitoring and is limited to
patients who bled heavily during the initial period following surgery, because the blood
should be collected over a period of not more than six hours. The transfusion of autologous
pre-donated blood is also commonly used in THA surgery. While autologous pre-donated blood
is not associated with the risk of viral disease transmission, the rates of administrative
error and bacterial overgrowth (the factors most frequently associated with immediate
post-transfusion deaths) are comparable with those associated with the use of homologous
blood. The collection of pre-donated blood requires special programs and scheduling. Studies
have indicated that the use of autologous blood transfusions may have little health benefit
at considerable costs.
During surgery, meticulous electrocautery, helps minimize both acute blood loss and
post-operative drainage. No uniform guidelines exist regarding the use of post-operative
drains in THA. Some surgeons use drain systems that allow re-infusion of the erythrocytes,
others prefer simple vacuum drains. Still others do not use drains at all. There are
conflicting data regarding the efficacy of closed suction drains. Some studies have shown
that bleeding may be potentiated by suction drainage. Other studies have shown that drains
can lead to complications such as infection, increased blood loss, need for blood
transfusions, breakage in the drain tube, and pain during drain tube removal. Thus, the need
for adequate hemostasis in THA remains apparent.
To date there have been limited published studies on the use of hemostatic agents during THA
procedures. However, even in a relatively low number of patients these studies have shown
that the use of hemostatic agents is a safe and effective means to reduce blood loss and the
need for and rate of blood transfusions.
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Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Treatment
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