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Blood transfusion Physiology
Learning Objectives
Blood transfusions - basis of blood typing, Cross matching
Blood Storage in blood bank
Who can be a blood donor
Complications of Blood transfusions (transfusion reactions)
Blood components
What is blood transfusion
The transfer of blood or blood components from one person (the donor)
into the bloodstream of another person (the recipient)
Blood Typing
Cross Matching
Cross Matching is a procedure performed prior to a blood transfusion to detect
incompatibilities between the donor and recipient.
Cross Matching
Indication of blood transfusion
Many times, blood transfusion might not be without hazards, so the risk should be
weighed out against benefit.
The dictum is - TO USE BLOOD PRODUCTS ONLY WHEN NO OTHER ALTERNATIVE IS LEFT
Blood Donation : Who Can Give Blood?
Basic Eligibility Guidelines
Age:
Weight:
Hb:
Serum Transmitted Disease patient :
Vaccintion:
High Blood Pressure:
Diabetes:
Cold and Flu:
Diet:
Tattoos and Piercing:
Blood Transfusion Therapy
Storage of blood
Blood should be tested for Blood/Serum
Transmitted Diseases (STDs) before storage
Storage of blood
CPDA-1
Tri sodium citrate
26.35
(g)
Citric acid (g)
3.27
Dextrose (g)
31.90
Monobasic sodium
2.22
phosphate (g)
Adenine (g)
0.27
Distilled water (ml)
1000
Preservative (ml) /
14
100ml blood
Storage at 2-6 ?C
Hazards of blood transfusion
Transfusion reaction
Due to mismatching/hemolytic
Other than mismatching
(Agglutination/Immunologic reaction)
Hemolytic Transfusion Reactions (HTR)
Hemolytic Transfusion Reactions (HTR)
Non-Hemolytic Transfusion Reactions (NHTR)
Mild Allergic Reactions
Anaphylactic Shock
& Non hemolytic
Spread of Serum Transmitted Disease
Transfusion of Blood Components
Transfusion of `Blood Components' is ?
When, specific portion or fraction of blood that is lacking in a patient is
transfused.
Advantages of blood component therapy
Avoids the risk of sensitizing the patients to other blood components.
Provides optimal therapeutic benefit while reducing risk of volume overload.
Increases availability of needed blood products to larger population.
Thus it is a safe and low risk procedure
Self Assessment
Critical Thinking Questions
1. Following a motor vehicle accident, a patient is rushed to the emergency department with multiple traumatic injuries,
causing severe bleeding. The patient's condition is critical, and there is no time for determining his blood type. What
type of blood is transfused, and why?
2. In preparation for a scheduled surgery, a patient visits the hospital lab for a blood draw. The technician collects a blood
sample and performs a test to determine its type. She places a sample of the patient's blood in two wel s. To the first wel
she adds anti-A antibody. To the second she adds anti-B antibody. Both samples visibly agglutinate. Has the technician
made an error, or is this a normal response? If normal, what blood type does this indicate?
Self Assessment
1. The process in which antibodies attach to antigens, causing the formation of masses of linked cells, is cal ed-
A. sensitization
B. coagulation
C. agglutination
D. hemolysis
2. People with type O blood group -
A. have both antigens A and B on their erythrocytes
B. lack both antigens A and B on their erythrocytes
C. have neither anti-A nor anti-B antibodies circulating in their blood plasma
D. are considered universal recipients
3. Hemolytic disease of the newborn is a risk during a subsequent pregnancy in which:
A. a type AB mother is carrying a type O fetus
B. a type O mother is carrying a type AB fetus
C. a Rh+ mother is carrying an Rh- fetus
D. a Rh- mother is carrying a second Rh+ fetus
Thank you
This post was last modified on 08 April 2022