Module 3: Indications for blood/ blood components
Transfusion Training WorkshopKKM 2012
Case 1 – PRBC
Cik SL, 18 year-old lady
Had reconstruction of L mandible
Blood loss 2 L
Hb dropped from 11 to 8.5 g/dL
PR 100 BP 120/70
1 unit packed red blood cell (PRBC) transfused
Case 2 – PRBC
Cik SB, 25 year-old lady
Delivered SVD 1st child
Blood loss 80 mL
Hb 7.5 g/dL MCV 65fL MCH 19 pg
Transfused 2 units PRBC
Case 3 – PRBC
En SM, 35 year-old man
Admitted to ICU for multiple trauma
Hb 8.9 g/dL
Transfused 2 units PRBC
Case 4 – PRBC
En AF, 56 year-old man
Admitted for hernia repair
Known DM with CKD type II
Hb 10.0 g/dL
2 units PRBC requested
Adaptive mechanisms to avoid tissue hypoxia
When Hb falls, cardiac output increases blood viscosity decreases peripheral vasoconstriction occurs
To maintain O2 delivery to tissues
Clinicians underestimate the effectiveness of adaptive mechanisms
Over-reliance on Hb measurements
Using a Hb trigger of 10 g/dL
>> Leading to excessive and inappropriate use of red cell transfusions
Indications for packed red cells Factors to be considered:
Acute vs. chronic anaemia
On-going blood loss
Age of patient
Underlying medical illness
Acute anaemia (due to blood loss)
Acute blood loss(no on-going loss)
% blood volume loss
Blood volume mL
Need for PRBC transfusion
15 750 No*
15 – 30 800 – 1500 No*
30 – 40 1500 – 2000 Probably
>40 > 2000 Yes
* Except for patients who tolerate anaemia poorly eg. pre-existing anaemia, severe cardiac or respiratory disease, age >65 years
BJH guidelines 2001
Acute blood loss(no on-going loss)
% blood volume loss
Blood volume mL
Need for PRBC transfusion
15 750 No*
15 – 30 800 – 1500 No*
30 – 40 1500 – 2000 Probably
>40 > 2000 Yes
* Except for patients who tolerate anaemia poorly eg. pre-existing anaemia, severe cardiac or respiratory disease, age >65 years
BJH guidelines 2001
Acute blood loss(no on-going loss)
% blood volume loss
Blood volume mL
Need for PRBC transfusion
15 750 No*
15 – 30 800 – 1500 No*
30 – 40 1500 – 2000 Probably
>40 > 2000 Yes
BJH guidelines 2001
Acute blood loss(no on-going loss)
% blood volume loss
Blood volume mL
Need for PRBC transfusion
15 750 No*
15 – 30 800 – 1500 No*
30 – 40 1500 – 2000 Probably
>40 > 2000 Yes
BJH guidelines 2001
Acute blood loss(no on-going loss)
% blood volume loss
Blood volume mL
Need for PRBC transfusion
15 750 No*
15 – 30 800 – 1500 No*
30 – 40 1500 – 2000 Probably
>40 > 2000 Yes
BJH guidelines 2001
* Except for patients who tolerate anaemia poorly eg. pre-existing anaemia, severe cardiac or respiratory disease, age >65 years
Acute blood loss(no on-going loss)
Hb level g/dL Need for PRBC transfusion
< 7 Yes
7 – 10 No*
> 10 No •Except for patients who tolerate anaemia poorly eg. severe cardiac or respiratory disease, age >65 years
BJH guidelines 2001
Case 1 – PRBC
Acute blood loss of 2L = 40% loss of blood volume
Need for transfusion: probably
But in view of young age and Hb >8.0 with no ongoing blood loss
Decision: not to transfuse
Chronic anaemia
Chronic anaemia
Chronic anaemia is better tolerated
Better O2 delivery due to the increase in 2,3 DPG and a shift in the O2 dissociation curve
Cardiac output at rest does not usually increase until Hb falls <7 g/dL
Chronic anaemia
The cause of anaemia should be established
Correct the anaemia eg. iron deficiency anaemia with iron Rx
Usually asymptomatic with Hb >7 g/dL
Transfuse only if life-threatening
BJH guidelines 2001
Case 2 – PRBC
1st pregnancy Minimal blood loss post-partum Hb 7.5 g/dL Hypochromic microcytic indices Most likely iron deficiency anaemia Treat with iron supplements while
investigating No indication for transfusion
Anaemia in Critical Care
Anaemia in critical care
Same target apply as for acute blood loss
Over-transfusion may increase mortality in this group
Herbert et al, NEJM 1999
0 5 10 15 20 25 30
Days
Surv
ival %
Restrictive-transfusionstrategy (trigger Hb <7)
Liberal-transfusion strategy (trigger Hb <10)
P= 0.10
50
60
70
80
90
100
Herbert et al, NEJM 1999
30-day mortality no worse: all patients
0 5 10 15 20 25 30
Days
Surv
ival %
Restrictive-transfusionstrategy (trigger Hb <7)
Liberal-transfusion strategy (trigger Hb <10)
P= 0.02
50
60
70
80
90
100
Herbert et al, NEJM 1999
30-day mortality lower in patients with APACHE II score <20
Anaemia in critical care
Hb level g/dL Need for PRBC transfusion
< 7 Yes
7- 10 No*
> 10 No •Except for patients who tolerate anaemia poorly eg. severe cardiac or respiratory disease, age >65 years
BJH guidelines 2001
Case 3 – PRBC
Multiple trauma
Hb 8.9
Age 35 years
No case for transfusion
Pre-operative Assessment
Peri-operative transfusion
Objective is to manage the patient so that transfusion is not needed
Investigate and treat anaemia prior to op
Discontinue anti-platelet drugs or anticoagulants if possible
Consider erythropoeitin or autologous transfusion
Management of acute haemorrhage during surgery is the same approach as for acute blood loss
BJH guidelines 2001
Case 4 – PRBC
Hernia repair
Hb 10 g/dL
No indication for transfusion
Case 1 – Whole blood
51 year-old lady
c/o: fever x 5 days Myalgia Haematemesis x 1
cupful
Hb 10.7 Hct 31 Plt 42
Dengue IgM pos (D7)
O/E: Pink
BP 115/66 PR 110
T 37.5
Case 1 – WB
Chest: dull both bases
Abd: tender RHC and ascites
Diagnosis: DHF or severe dengue
2 pints whole blood (WB) requested
Whole blood
Made into components
Contain 1 unit red cell, 1 unit plasma and 1 unit platelet
Kept at 4oC
Labile clotting factors are lost
Platelets are non-functional
Case 1 – WB
Plasma in WB will leak in DHF
Higher risk of TRALI with WB
PRBC stays in vessels, less leak (indicated only if signs of occult bleeding)
Monitor clinically
Indications for WB
Most indications for WB transfusion are now well managed exclusively with blood component therapy
Storage of WB precludes the production of components and is highly inefficient
WB is thus unavailable in most blood banks in the United States
AABB circular 2009
Case 1 – FFP
Pn SA, 60 year-old lady
h/o Hypertension and IHD
Atrial fibrillation on warfarin
Case 1 – FFP
c/o severe headache
O/E: R hemiparesis GCS 12/15
CT scan: L parietal haemorrhage
INR 9.0
Case 1 – FFP
Urgent 4 units FFP requested
IV vitamin K 10 mg bolus
FFP transfused 1½ hour later (6h after admission)
Case 1 – FFP
GCS deteriorated
Intubated and ventilated
Referred neurosurgical
Conservative Mx
Indications for FFP
1. For warfarin reversal in a bleeding patient ONLY if prothrombin complex concentrate (PCC) is not available
BJH guidelines 2001
Warfarin reversal
INR and discontinuation of Warfarin
White 1995
Reversing Warfarin Effect
Stop warfarin
Give Vitamin K
PCC or FFP
Prothrombin Complex Concentrate (PCC) Lyophilised powder
Reconstituted within 1 minute
Kept at pharmacy (like albumin and ivIg)
INR reversal by PCC
Yasaka 20037-27u/kg
Pre Post
100
90
30
60
80
40
50
20
70
10
0Pre Post
100
90
30
60
80
40
50
20
70
10
0
Reversal of Warfarin800 mL FFP 25-30 U/kg PCC
FII
Makris 1997Median 3 17 15 65
Warfarin and ICH
6x risk of hematoma expansion after admission
Expansion is associated with poor outcome
3x mortality risk than non-warfarin ICH
Flibotte 2004
PCC vs FFP
PCC gives more rapid and complete correction of warfarin-induced coagulation defect than FFP
Rapid correction of INR prevents ICH enlargement
Must combine with Vitamin K for sustained reversal
Yasaka 2003
Fredriksson 1992
FFPTime to thaw
15 mL/kg: large volume
Slow to administer
Effect on levels is small
Multiple donors, ±
untreated
Blood group required
Generally available
PCCRapid reconstitutionMinimal volume Rapid
administrationReliable correction Prothrombotic riskPooledViral inactivation Limited availability
Rapid reversal of warfarin
PCC
Prothrombinex
Octaplex
Beriplex
PCC for warfarin reversal
4- factor PCC contains factors II, IX and X + factor VII
Beriplex Octaplex
3- factor PCC contains factors II, IX and X (little factor
VII) Prothrombinex
Warfarin reversal: guidelines
BJH guidelines 2011
Non-emergency
INR 5 – 8, no bleeding Stop warfarin
INR >8, or <8 + bleeding IV Vit K 2 – 5 mg
BJH guidelines 2011
Management of emergency or life-threatening bleeding
Stop warfarin Give IV Vitamin K 5 mg Give 4-factor PCC:
INR Dose< 5.0 15 IU/kg
≥ 5.0 30 IU/kg pending 30 IU/kg
Makris 2005
Safe INR for surgery
INR <1.5
Corresponds to factor levels >50%
Safe for most surgeries
INR <1.2
Corresponds to factor levels >80%
Surgeries in critical sites eg. neurosurgery
Ansell J, Chest 2001White RH, Ann Intern Med 1999
Case 2 – FFP
DI, 64 year-old man
h/o Forest 2a ulcer and UGIB
Elective OGDS planned
2 units FFP requested
Hb 14 g/dL
PT 14s APTT 28s
Case 2 – FFP
Not sure the reason for requesting FFP
Why was PT and APTT testing done?
If you took a good history, the UGIB must be due to the ulcer (and not due to a
bleeding disorder)
This practice of simply requesting FFP before a procedure MUST STOP
PT and APTT
Puetz J, JTH 2013
FFP use
Puetz J, JTH 2013
Pre-operative coagulation screening tests BCSH guideline 2008
PPV of abnormal tests 0.03 – 0.23 No significant increase in bleeding
associated with abnormal tests
Routine pre-op screening is NOT RECOMMENDED
Chee, BCSH guidelines 2008
Case 3 – FFP
En SY, 48 year-old man
Alcoholic liver disease
Elective OGDS planned
PT 15s APTT 30s
2 units FFP transfused
Indications of FFP
2. Liver disease in the PRESENCE of coagulopathy AND life-threatening bleeding
BCSH guidelines 2001
FFP and liver disease
The response to FFP in liver disease is unpredictable
Other factors like dysfibrinogenaemia, thrombocytopenia and hyperfibrinolysis need to be considered
There is no evidence to substantiate the use of FFP to prevent bleeding in patients with liver disease and prolong PT
BCSH guidelines 2001
Case 3 – FFP
Yes, patient has liver disease but definitely no coagulopathy
So why transfuse FFP?
This is an INAPPROPRIATE & UNNECESSARY TRANSFUSION – a practice which has to STOP
Other indications for FFP
3. Massive transfusion with excessive bleeding, guided by timely tests of coagulation
4. Plasma exchange for Thrombotic Thrombocytopenic Purpura (TTP)
5. Multiple coagulation factor deficiencies or DIC with bleeding
6. FV deficiency where no clotting factor concentrate is available
BCSH guidelines 2001
ICU patients
Many patients in ICU have a prolong PT due to inadequate vitamin K intake
ICU patients should routinely receive vitamin K; 10 mg thrice weekly for adults and 0.3 mg/kg for children
FFP is not the treatment of choice for correcting inadequate vitamin K intake, even if clotting times are prolonged and an invasive procedure such as liver biopsy is being contemplated
BCSH guidelines 2001
In other words
Please don’t use FFP to correct clotting times (or to shrink haematomas!)
Treat the patient as a whole; NOT as a number
Requesting FFP
2 units?
4 units?
Dose calculation is 15 mL/kg per dose
1 unit FFP ≅ 200 mL
Eg. for a 50 kg patient = 750 mL = 4 units
What’s in FFP?
All the coagulation factors
1 unit FFP increases most factors by about 5% (in a 50-kg patient)
4 units FFP will increase to 20%
But will also depend on the size of the patient
Case 4 – FFP
45 year-old man
Chronic hepatitis B with hepatocellular carcinoma
Portal vein thrombosis
c/o abdominal pain and vomiting
Referred to H. Selayang
Case 4 – FFP
Hb 10.7 TW 10.5 Plt 134
ALT 668 T. Bil 14.5
APTT 36.6 s PT 18.5 s
Was informed by liver team to transfuse 4 FFP before transferring patient and
Another 4 FFP to be transported together with patient to hospital
Case 4 – FFP
No indication for FFP (no bleeding, instead has thrombosis!)
Once thawed, coagulation factors in FFP decay with transport time and are destroyed by heat
Once thawed, FFP must be transfused immediately
Puetz J, JTH 2013
Case 6 – (accompanying) PRBC
49 year-old man, alcoholic
Subdural haematoma
Hb 13.5 PT 12s APTT 36s
Referred to neurosurgery
Neurosurgeon requests patient to be transferred along with 2 PRBC
The practice of transporting blood and blood components with patients is strongly discouraged
This will result in wastage or unnecessary transfusion
Case 1 – platelet
MC, 60 year-old lady
Admitted with acute myocardial infarction
Platelet count 38 x 109/L
Streptokinase and LMWH not given
Request platelet transfusion prior to antiplatelet therapy
Patient succumbed from CCF 1 week later
Platelet clumping
Pseudo-thrombocytopenia
Case 1 – platelet
Again, trying to correct a number
Patient was not bleeding BUT clotting!
Case 2 – platelet
Madam LNY, 60 year-old lady
Known chronic renal failure
Admitted for UGIB
Platelet count 90 x 109/L Urea 48
Approx 30 cc of hematemesis documented
Request platelet transfusion prior to HD therapy
Indications for platelet transfusion- treatment Thrombocytopenia* and life-threatening
bleeding (cause of thrombocytopenia needs to be established)
DIC or massive transfusion with excessive bleeding
Platelet dysfunction Uraemia with life-threatening bleeding not controlled
with DDAVP or cryoprecipitate Post-cardiac bypass with bleeding not due to surgical
causes or heparin effect Inherited platelet dysfunction with life-threatening
bleeding
Indications for platelet transfusion- prophylaxis
Platelet count <10 x 109/L in patients with BM failure
To keep platelet count >50 x 109/L prior to lumbar puncture or surgery
Requesting platelets
Paediatric dose: 1 unit/ 10kg or 15mL/kg
A rise of 50 x 109/L is expected
Adult dose: 4 – 6 units or 1 apheresis
A rise of 45 x 109/L is expected for a 70kg patient
Case 1 – cryoprecipitate
ER, 33 yr old man Brought in by passer-by in a hit & run
accident Suspected pelvic fracture Alert GCS – full BP 100/60 PR 106 Hb 12.8 PT/APTT – normal Request for cryoppt in view of possible
massive internal bleed
No role for prophylactic cryoprecipitate
What’s in cryoprecipitate?
Fibrinogen
Factor VIII
von Willebrand factor
Factor XIII
Indications for cryoprecipitate
Hypofibrinogenemic states with bleeding DIC – disseminated intravascular coagulation APML – acute promyelocytic leukaemia
No longer used for haemophilia A, von Willebrand disease or factor XIII deficiency where concentrates are now available
Dosing for cryoprecipitate
1 unit contains 350 mg fibrinogen
Paediatric dose: 1 unit/10 kg or 5ml/kg will increase fibrinogen by 60 – 100 mg/dL
Adult dose: 1 pool = 6 units 1 pool cryoprecipitate increases fibrinogen
by 45 mg/dL in a 70kg patient
The next time you decide to transfuse
Stop, think and ask yourself …
Is it really necessary?
The end