🩸 Blood Transfusion

by Didactic Med

🩸 Blood Product Overview

🔴 Packed Red Blood Cells (PRBCs)

Volume: ~300-350 mL per unit

Storage: 1-6°C for up to 42 days

Hematocrit: 55-65%

Expected Increase: 1 unit raises Hb by ~1 g/dL and Hct by ~3%

Transfusion Time: 1.5-4 hours per unit

Primary Indication: Symptomatic anemia or acute blood loss

Contains: Red blood cells, minimal plasma, anticoagulant-preservative solution

💛 Fresh Frozen Plasma (FFP)

Volume: ~250-300 mL per unit

Storage: Frozen at -18°C or colder for up to 1 year

Thawing Time: 30-40 minutes

Expected Increase: 1 unit increases coagulation factors by 2-3%

Transfusion Time: Within 24 hours of thawing

Primary Indication: Coagulopathy with active bleeding or before invasive procedures

Contains: All coagulation factors, albumin, immunoglobulins

🌸 Platelets

Volume: ~50-70 mL per unit (random donor) or ~200-400 mL (apheresis)

Storage: 20-24°C with continuous agitation for up to 5-7 days

Dose: 1 apheresis unit OR 4-6 random donor units

Expected Increase: 30,000-60,000/μL per apheresis unit

Transfusion Time: 30-60 minutes

Primary Indication: Thrombocytopenia with bleeding or bleeding risk

Contains: 3-6 × 10¹¹ platelets per apheresis unit

💙 Cryoprecipitate

Volume: ~10-15 mL per unit

Storage: Frozen at -18°C or colder for up to 1 year

Thawing Time: 15-30 minutes

Dose: 1-2 units per 10 kg body weight (usually 10 units)

Expected Increase: Raises fibrinogen by ~50-100 mg/dL per 10 units

Primary Indication: Hypofibrinogenemia (<100 mg/dL)

Contains: Fibrinogen, Factor VIII, Factor XIII, vWF, fibronectin

🔬 Blood Product Components

Product Key Components ABO Compatibility Rh Compatibility
PRBCs RBCs, minimal WBCs (if leukoreduced) Must be ABO compatible Rh(-) patients should receive Rh(-) blood
FFP All clotting factors, proteins Must be ABO compatible (reverse) Rh not critical
Platelets Platelets, minimal plasma ABO identical preferred, compatible acceptable Rh(-) females of childbearing age: Rh(-) preferred
Cryoprecipitate Fibrinogen, FVIII, FXIII, vWF ABO compatibility not required Rh not critical

📊 Transfusion Thresholds & Indications

🔴 Red Blood Cell Transfusion (AABB 2024 Guidelines)

Restrictive Strategy (Recommended for Most Patients)

  • Hemodynamically stable hospitalized patients: Hb <7 g/dL
  • Post-operative patients: Hb <8 g/dL
  • Cardiovascular disease (stable): Hb <8 g/dL
  • Acute coronary syndrome: Hb <8 g/dL (consider higher threshold 8-10 g/dL if symptomatic)

Higher Threshold Considerations

  • Active bleeding: Clinical judgment, not solely based on Hb
  • Symptomatic anemia: Dyspnea, tachycardia, chest pain, orthostatic hypotension
  • Acute stroke: Generally avoid transfusion unless Hb <7-8 g/dL
  • Bone marrow failure syndromes: Individualized approach

🌸 Platelet Transfusion Thresholds

Prophylactic Transfusion

  • Hematology/oncology patients: <10,000/μL (stable) or <20,000/μL (with fever, infection)
  • Before major surgery: <50,000/μL
  • Before neurosurgery or eye surgery: <100,000/μL
  • Central line placement: <20,000/μL
  • Lumbar puncture: <50,000/μL

Therapeutic Transfusion (Active Bleeding)

  • Major bleeding: Maintain >50,000/μL
  • CNS or ophthalmologic bleeding: Maintain >100,000/μL
  • Massive transfusion: Target >50,000/μL
⚠️ Avoid platelet transfusion in: TTP, HIT (unless life-threatening bleeding), spontaneous HUS

💛 Plasma (FFP) Transfusion

Indications for FFP

  • Active bleeding with coagulopathy: INR >1.5-2.0 OR PT/aPTT >1.5× normal
  • Before invasive procedure: INR >1.5-2.0 (depends on procedure risk)
  • Massive transfusion: 1:1:1 ratio with PRBCs in protocol
  • Urgent warfarin reversal: With vitamin K and/or PCC
  • TTP/HUS: For plasma exchange
  • Rare coagulation factor deficiencies: When specific concentrates unavailable

Dose: 10-20 mL/kg (usually 4-6 units for adults)

💙 Cryoprecipitate Transfusion

Primary Indications

  • Hypofibrinogenemia: Fibrinogen <100 mg/dL with bleeding
  • Massive transfusion: Target fibrinogen >150-200 mg/dL
  • DIC with bleeding: Fibrinogen <100 mg/dL
  • Cardiac surgery: Fibrinogen <200 mg/dL with microvascular bleeding
  • Von Willebrand disease: When DDAVP/specific concentrates unavailable

Dose: 10 units (1 pool) raises fibrinogen by 50-100 mg/dL

⚖️ Balancing Risks vs Benefits

Clinical Scenario Transfusion Strategy Target Hemoglobin
Critically ill (non-cardiac) Restrictive 7-9 g/dL
Acute coronary syndrome Restrictive-Moderate 8-10 g/dL
Cardiac surgery Restrictive 7.5-9 g/dL
Upper GI bleeding Restrictive 7-9 g/dL
Traumatic brain injury Moderate 9-10 g/dL
Sickle cell disease Individualized Varies (usually 9-10 g/dL)
Oncology/chemotherapy Restrictive 7-8 g/dL

🔬 Pre-Transfusion Testing

Essential Pre-Transfusion Laboratory Tests

Type and Screen (T&S)

  • ABO typing: Forward and reverse typing
  • Rh (D) typing: Determines Rh positive or negative status
  • Antibody screen: Detects unexpected red cell antibodies
  • Validity: 72 hours (3 days) for patients with transfusion/pregnancy in past 3 months
  • Turnaround time: 30-60 minutes

Type and Crossmatch (T&C)

  • Includes all T&S tests PLUS crossmatching
  • Crossmatch: Tests patient serum against donor RBCs
  • Major crossmatch: Patient serum + donor RBCs (required)
  • Minor crossmatch: Donor serum + patient RBCs (rarely performed)
  • Turnaround time: 45-90 minutes

Emergency/Urgent Situations

  • Immediate release (uncrossmatched): O negative blood (universal donor)
  • Type-specific (ABO/Rh matched): Available in 5-10 minutes
  • Computer crossmatch: If no unexpected antibodies, available in 5-10 minutes
  • Emergency indication: Document medical necessity for uncrossmatched blood

🩺 Pre-Transfusion Patient Assessment

1 Obtain Informed Consent
  • Explain risks and benefits of transfusion
  • Discuss alternatives if applicable
  • Document consent in medical record
  • Emergency exception when patient unable to consent
2 Verify Patient Identity
  • Two patient identifiers (name + DOB or medical record number)
  • Check patient wristband
  • Verbally confirm with conscious patient
3 Review Medical History
  • Previous transfusions and any reactions
  • Pregnancy history (women)
  • Current medications (especially anticoagulants)
  • Allergies (especially to plasma proteins)
4 Obtain Baseline Vital Signs
  • Temperature
  • Blood pressure
  • Heart rate
  • Respiratory rate
  • Oxygen saturation
5 Establish IV Access
  • 18-20 gauge catheter preferred for RBCs
  • Smaller gauge acceptable for platelets/plasma
  • Verify IV patency

📋 ABO Blood Group Compatibility

Patient Blood Type Can Receive RBCs From Can Receive Plasma From
A+ A+, A-, O+, O- A, AB
A- A-, O- A, AB
B+ B+, B-, O+, O- B, AB
B- B-, O- B, AB
AB+ Universal recipient (all types) AB only
AB- AB-, A-, B-, O- AB only
O+ O+, O- O, A, B, AB (universal plasma recipient)
O- O- only O, A, B, AB (universal plasma recipient)
⚠️ Remember: For RBCs, transfuse compatible cells (based on recipient antibodies). For plasma, transfuse compatible plasma (based on recipient antigens). Platelets follow similar rules but less critical due to low plasma volume.

💉 Transfusion Procedure

🔐 Product Verification (Critical Safety Step)

1 Two-Person Verification at Bedside
  • Check patient wristband with two identifiers
  • Verify blood product label matches patient information
  • Confirm ABO/Rh compatibility
  • Check unit number, expiration date, and time
  • Inspect bag for signs of contamination (clots, discoloration, hemolysis)
  • Document verification in transfusion record
⚠️ Critical Safety: Wrong blood in tube (WBIT) and clerical errors account for most fatal transfusion reactions. Never skip bedside verification!

🩸 Administration Procedure

For Packed Red Blood Cells

  1. Inspect unit: Gently mix; check for clots, unusual color, or leaks
  2. Use appropriate filter: Standard 170-260 micron filter (built into administration set)
  3. Prime tubing: Use 0.9% normal saline only (never dextrose solutions)
  4. Start slowly: 2 mL/min (or 50-100 mL/hr) for first 15 minutes
  5. Monitor closely: Stay at bedside for first 15 minutes
  6. Increase rate if tolerated: Complete transfusion within 4 hours
  7. Maximum time: Do not exceed 4 hours per unit (bacterial growth risk)

For Fresh Frozen Plasma

  1. Thaw completely: 30-40 minutes at 30-37°C
  2. Inspect after thawing: Should be clear/slightly cloudy yellow
  3. Administer rapidly: Usually over 30-60 minutes
  4. Use within 24 hours of thawing
  5. Use standard blood filter

For Platelets

  1. Store at room temperature: 20-24°C with gentle agitation
  2. Inspect unit: Should show gentle swirling when held to light
  3. Transfuse rapidly: Usually over 30-60 minutes
  4. Do NOT refrigerate platelets
  5. Complete within 4 hours of issue
  6. Use platelet administration set (with or without filter)

For Cryoprecipitate

  1. Thaw at 30-37°C: 15-30 minutes
  2. Pool multiple units if ordered
  3. Administer rapidly: Usually push or over 10-15 minutes
  4. Use within 4-6 hours of thawing
  5. Use standard blood filter

📊 Monitoring During Transfusion

Time Point Monitoring Required Action
Before starting Complete vital signs Document baseline
First 15 minutes Stay at bedside, continuous observation Most acute reactions occur in this period
15 minutes Vital signs Compare to baseline; document
Hourly Vital signs, patient assessment Watch for signs of reaction
Completion Final vital signs Document completion time and volume
Post-transfusion Monitor for delayed reactions Educate patient on signs to report

⚠️ When to Stop Transfusion Immediately

🚨 STOP Transfusion If Patient Develops:

  • Fever: Temperature increase ≥1°C (1.8°F) or ≥38°C (100.4°F)
  • Chills or rigors
  • Hypotension: Decrease >30 mmHg systolic or MAP <65 mmHg
  • Hypertension: Increase >30 mmHg systolic
  • Tachycardia: Increase >30 bpm from baseline
  • Dyspnea or respiratory distress
  • Chest pain or back pain
  • Skin reactions: Urticaria, flushing, angioedema
  • Nausea or vomiting
  • Change in mental status
  • Dark urine (hemoglobinuria)

📝 Documentation Requirements

Required Documentation Elements:
  • Date and time transfusion started and completed
  • Blood product type and unit number(s)
  • Patient identification verified by two healthcare providers
  • Pre-transfusion vital signs
  • Vital signs at 15 minutes and completion
  • Volume transfused
  • Any adverse reactions
  • Patient tolerance and response
  • Signature of transfusionist

⚠️ Transfusion Reactions

🔴 Acute Hemolytic Transfusion Reaction (AHTR)

Acute Hemolytic Transfusion Reaction

Incidence: 1 in 38,000 to 1 in 70,000 transfusions

Mortality: 1 in 1.8 million units (but can be fatal)

Timing: Usually within minutes to hours

Pathophysiology:

  • ABO incompatibility (most common and severe)
  • Recipient antibodies attack donor RBCs
  • Intravascular hemolysis
  • Activation of complement cascade

Clinical Presentation:

  • Classic triad: Fever, flank/back pain, hemoglobinuria (red/dark urine)
  • Anxiety, restlessness
  • Chest pain, dyspnea
  • Hypotension, tachycardia
  • DIC (in severe cases)
  • Acute kidney injury
  • In anesthetized patients: hypotension, bleeding, hemoglobinuria

Immediate Management:

  1. STOP transfusion immediately
  2. Maintain IV access (new line with normal saline)
  3. Notify physician and blood bank STAT
  4. Verify patient and unit identification
  5. Send to lab:
    • Blood bank: Return blood unit, obtain new sample for repeat type and crossmatch, direct antiglobulin test (DAT)
    • Labs: CBC, chemistry panel, coagulation studies, urinalysis
    • LDH, indirect bilirubin, haptoglobin (hemolysis markers)
  6. Aggressive fluid resuscitation (goal UOP >100 mL/hr)
  7. Consider diuretics (furosemide) to maintain urine output
  8. Monitor for DIC and renal failure
  9. Consider vasopressors if hypotensive despite fluids

💨 Transfusion-Related Acute Lung Injury (TRALI)

TRALI - Leading Cause of Transfusion-Related Death

Incidence: 1 in 5,000 to 1 in 12,000 transfusions

Mortality: 5-10%

Timing: Within 6 hours of transfusion (usually 1-2 hours)

Pathophysiology:

  • Donor antibodies (anti-HLA or anti-HNA) react with recipient leukocytes
  • Neutrophil activation in pulmonary capillaries
  • Increased pulmonary vascular permeability
  • Non-cardiogenic pulmonary edema

Clinical Presentation:

  • Acute respiratory distress: Dyspnea, tachypnea, hypoxemia
  • Bilateral pulmonary infiltrates on CXR
  • Fever, hypotension (in 50%)
  • Normal BNP/pro-BNP (helps distinguish from TACO)
  • Normal or low CVP
  • PaO2/FiO2 <300 mmHg or SpO2 <90% on room air

Management:

  1. STOP transfusion immediately
  2. Supportive respiratory care (oxygen, ventilation if needed)
  3. Fluid management: Often requires CONSERVATIVE fluids
  4. Diuretics generally NOT helpful (unless concurrent TACO)
  5. Most cases resolve within 48-96 hours with supportive care
  6. Report to blood bank (implicated donor deferred from future donations)
⚠️ TRALI vs TACO: Both cause respiratory distress, but TRALI has normal cardiac function and BNP, while TACO has elevated BNP and signs of volume overload

💧 Transfusion-Associated Circulatory Overload (TACO)

TACO - Most Common Transfusion Complication

Incidence: 1-8% of transfusions (likely underreported)

Timing: Within 6 hours (often during or shortly after transfusion)

Risk Factors:

  • Heart failure, renal failure
  • Elderly patients
  • Rapid transfusion rate
  • Large volume transfusion
  • Positive fluid balance

Clinical Presentation:

  • Respiratory distress: Dyspnea, orthopnea
  • Hypertension (distinguishes from TRALI)
  • Elevated BNP/pro-BNP
  • Elevated JVP, peripheral edema
  • S3 gallop on cardiac exam
  • Pulmonary edema on CXR
  • Positive fluid balance

Management:

  1. STOP or SLOW transfusion
  2. Sit patient upright
  3. Oxygen therapy
  4. IV diuretics (furosemide 20-40 mg IV)
  5. Consider nitroglycerin if hypertensive
  6. Respiratory support as needed (CPAP, BiPAP, intubation)

Prevention:

  • Transfuse slowly in high-risk patients (over 3-4 hours per unit)
  • Consider diuretics between units
  • Minimize unnecessary transfusions
  • Monitor fluid balance carefully

🌡️ Febrile Non-Hemolytic Transfusion Reaction (FNHTR)

FNHTR - Most Common Reaction

Incidence: 0.1-1% with leukoreduced products

Timing: During or within 4 hours of transfusion

Pathophysiology:

  • Cytokines released from donor leukocytes
  • Recipient antibodies to donor HLA antigens
  • Diagnosis of exclusion (rule out hemolytic reaction first)

Clinical Presentation:

  • Temperature rise ≥1°C (1.8°F) or ≥38°C (100.4°F)
  • Chills, rigors
  • No hemolysis
  • No other signs of acute reaction

Management:

  1. Stop transfusion temporarily
  2. Rule out hemolytic reaction (check for hemoglobinuria, hemolysis)
  3. Acetaminophen 650 mg PO/IV
  4. Meperidine 25-50 mg IV for rigors (if needed)
  5. Can resume transfusion if only fever/chills and hemolysis ruled out

Prevention:

  • Leukoreduction of blood products (now standard)
  • Premedication with acetaminophen (though evidence is limited)

🔆 Allergic Reactions

Allergic Transfusion Reactions

Incidence: 1-3% of transfusions

Mild Allergic Reaction:

  • Symptoms: Urticaria, pruritus, flushing
  • Management:
    • Stop transfusion temporarily
    • Diphenhydramine 25-50 mg IV/PO
    • Can resume transfusion after symptoms resolve

Severe Allergic/Anaphylactic Reaction:

  • Symptoms: Dyspnea, wheezing, angioedema, hypotension, shock
  • Risk factors: IgA deficiency with anti-IgA antibodies
  • Management:
    • STOP transfusion immediately
    • Epinephrine 0.3-0.5 mg IM (1:1000 solution)
    • Maintain airway, give oxygen
    • IV fluids for hypotension
    • Diphenhydramine 25-50 mg IV
    • Methylprednisolone 125 mg IV
    • Consider H2 blocker (ranitidine 50 mg IV)
  • Future transfusions: Washed RBCs/platelets or IgA-deficient products

🦠 Transfusion-Associated Sepsis

Bacterial Contamination

Incidence: Rare with current screening (1 in 100,000 platelet units, 1 in 5 million RBC units)

Highest risk: Platelets (stored at room temperature)

Clinical Presentation:

  • High fever (>39°C/102°F), rigors
  • Severe hypotension, shock
  • Rapid onset during or shortly after transfusion
  • May progress to DIC, multiorgan failure

Management:

  1. STOP transfusion immediately
  2. Blood cultures from patient (draw before antibiotics if possible)
  3. Culture blood product bag
  4. Broad-spectrum antibiotics STAT
  5. Aggressive resuscitation, vasopressor support

📅 Delayed Transfusion Reactions

Reaction Type Timing Key Features
Delayed Hemolytic 3-10 days Falling Hb, jaundice, positive DAT, low-grade fever
Alloimmunization Weeks-months New antibodies detected on antibody screen
Post-transfusion purpura 5-12 days Severe thrombocytopenia, treat with IVIG
TA-GVHD 1-6 weeks Fever, rash, liver dysfunction, pancytopenia; often fatal
Iron overload Months-years After multiple transfusions; manage with chelation

👶 Special Populations

Pediatric Transfusion

Dosing Calculations for Children

  • PRBCs: 10-15 mL/kg (raises Hb by 2-3 g/dL)
  • Platelets: 10-20 mL/kg or 1 unit per 10 kg
  • FFP: 10-15 mL/kg
  • Cryoprecipitate: 1 unit per 5-10 kg

Transfusion Thresholds - Pediatrics

  • Neonates (stable): Hb <7 g/dL
  • Neonates on O2 or ventilator: Hb <8-10 g/dL
  • Infants/children (stable): Hb <7 g/dL
  • Platelets (prophylactic): <10,000-20,000/μL
  • Platelets (before procedure): <50,000/μL
⚠️ Neonatal Considerations:
  • CMV-negative or leukoreduced products for CMV-negative neonates
  • Irradiated products to prevent TA-GVHD
  • Use satellite bags to minimize donor exposure
  • Slower transfusion rates (2-4 hours for RBCs)

Pregnancy and Obstetric Hemorrhage

Obstetric Hemorrhage Management

  • Definition: Blood loss >1000 mL or causing hemodynamic instability
  • Transfusion threshold: Generally more liberal (Hb <9-10 g/dL if ongoing bleeding)
  • O-negative blood: Immediately available for emergency
  • Massive transfusion protocol: Activate early for severe hemorrhage
  • Fibrinogen target: >200 mg/dL (critical in obstetric bleeding)
  • RhIG consideration: Rh-negative mothers receiving Rh-positive products need RhIG within 72 hours

Oncology/Hematology Patients

Special Considerations

  • Leukemia/lymphoma: Irradiated products to prevent TA-GVHD
  • BMT/stem cell transplant: CMV-negative or leukoreduced, irradiated products
  • HLA alloimmunization: Use HLA-matched or crossmatched platelets
  • Chronic transfusion: Extended RBC phenotype matching to reduce alloimmunization
  • Sickle cell disease: Extended phenotype matching; consider exchange transfusion

Sickle Cell Disease

Transfusion Strategy in SCD

  • Goal: Reduce HbS percentage, not just increase Hb
  • Simple transfusion: Target Hb 9-10 g/dL
  • Exchange transfusion: For acute chest syndrome, stroke, multiorgan failure
  • Phenotype matching: Match for C, E, and K antigens minimum (ABO, Rh, Kell)
  • Chronic transfusion: For stroke prevention (target HbS <30%)

Patients with Cardiac Disease

Cardiac Surgery

  • CABG patients: Restrictive strategy (Hb threshold 7.5-8 g/dL)
  • On-pump cardiac surgery: Higher bleeding risk; prepare crossmatched units
  • Anticoagulation: Reversal may be needed before transfusion procedures
  • Diuretics: Often given between units to prevent TACO

Immunocompromised Patients

Product Modifications

  • Irradiated products: For patients with:
    • Hodgkin disease
    • Congenital immunodeficiency
    • Bone marrow/stem cell transplant recipients
    • Intrauterine transfusions
    • Directed donations from blood relatives
    • HLA-matched products
  • CMV-negative or leukoreduced: For CMV-negative transplant candidates/recipients
⚠️ TA-GVHD Prevention: Gamma or X-ray irradiation (25-50 Gy) prevents donor lymphocyte engraftment. Always irradiate products for at-risk patients - TA-GVHD is almost always fatal (>90% mortality).

Jehovah's Witnesses

Management Strategies

  • Respect patient autonomy: Most refuse allogeneic blood products
  • Acceptable to many:
    • Cell salvage (intraoperative blood recovery)
    • Hemodilution
    • Erythropoietin
    • Some fractions (varies by individual belief)
  • Optimize:
    • Preoperative erythropoietin + iron
    • Minimize phlebotomy
    • Use pediatric tubes for lab draws
    • Restrictive threshold approach
  • Surgical techniques: Meticulous hemostasis, minimize blood loss

🚨 Massive Transfusion Protocol

Definition

Massive Transfusion: Transfusion of ≥10 units of PRBCs within 24 hours

OR transfusion of >4 units of PRBCs in 1 hour with anticipated ongoing need

🎯 Activation Criteria

Activate MTP When:

  • Penetrating torso trauma with hemodynamic instability
  • Blunt trauma with:
    • SBP <90 mmHg
    • Heart rate >120 bpm
    • FAST positive for free fluid
    • Pelvic fracture
  • Ruptured AAA
  • GI hemorrhage requiring ICU admission
  • Obstetric hemorrhage with ongoing bleeding
  • Any patient requiring ≥4 units PRBCs in 1 hour

📦 Massive Transfusion Pack Ratios

1:1:1 Ratio Protocol (Recommended)

Each MTP pack typically contains:

  • 6 units PRBCs
  • 6 units FFP
  • 1 apheresis platelet unit (or 6 random donor units)

Advantages: Reduces mortality, decreases coagulopathy, earlier hemostasis

1 Initial Resuscitation
  • Activate MTP immediately
  • Use O-negative (or O-positive in males/non-childbearing females) PRBCs
  • Start AB plasma (or compatible) immediately
  • Establish large-bore IV access (2 × 16-18 gauge)
  • Consider rapid infusion device
2 Blood Product Administration
  • Maintain 1:1:1 ratio (PRBCs:FFP:Platelets)
  • Give 10 units cryoprecipitate if fibrinogen <150 mg/dL
  • Tranexamic acid 1 g IV over 10 minutes, then 1 g over 8 hours (if <3 hours from injury)
  • Warm all blood products
  • Use rapid infuser or pressure bags
3 Laboratory Monitoring
  • Baseline: CBC, PT/INR, aPTT, fibrinogen, type and screen
  • Repeat labs every 30-60 minutes during active bleeding
  • ABG with lactate, calcium
  • Thromboelastography (TEG/ROTEM) if available
4 Target Parameters
  • Hemoglobin: 7-9 g/dL
  • Platelets: >50,000/μL (>100,000/μL for CNS injury)
  • INR: <1.5
  • Fibrinogen: >150-200 mg/dL
  • pH: >7.2
  • Temperature: >35°C (95°F)
  • Calcium (ionized): >1.1 mmol/L

⚠️ Complications of Massive Transfusion

Complication Mechanism Management
Hypothermia Cold blood products Warm all products, warming blankets, warm IV fluids
Hypocalcemia Citrate in blood products binds calcium Calcium chloride 1 g IV every 4-6 units; monitor ionized calcium
Hyperkalemia K+ leaks from stored RBCs Usually transient; monitor ECG; treat if severe
Dilutional coagulopathy Dilution of clotting factors/platelets Maintain 1:1:1 ratio; monitor labs; give cryoprecipitate
Metabolic acidosis Shock, lactate accumulation Address underlying cause; adequate resuscitation
Citrate toxicity Excess citrate anticoagulant Hypocalcemia correction; support liver function
TRALI/TACO Volume/antibodies Monitor respiratory status; supportive care

🔬 Tranexamic Acid in Massive Transfusion

CRASH-2 Trial Evidence

Indication: Trauma patients with significant bleeding or at risk of significant bleeding

Dosing:

  • Loading dose: 1 gram IV over 10 minutes
  • Maintenance: 1 gram IV over 8 hours

Timing critical: Must be given within 3 hours of injury for mortality benefit

Contraindication: >3 hours from injury (may increase mortality)

🎯 Damage Control Resuscitation Principles

  1. Permissive hypotension: Target SBP 80-90 mmHg until hemorrhage controlled (except TBI)
  2. Limit crystalloids: Minimize crystalloid use; avoid dilutional coagulopathy
  3. Hemostatic resuscitation: Early balanced blood product transfusion (1:1:1)
  4. Prevent/treat coagulopathy: Keep warm, correct acidosis, replace clotting factors
  5. Early definitive hemorrhage control: Surgical/interventional radiology
⚠️ Lethal Triad of Trauma: Hypothermia, acidosis, and coagulopathy. Aggressive prevention and treatment of all three is essential for survival.

🧮 Transfusion Calculators

Expected Hemoglobin Increase Calculator

Expected Changes:

Hemoglobin Increase:

Hematocrit Increase:

Blood Volume Calculator

Estimated Blood Volume:

30% Blood Loss:

40% Blood Loss:

Platelet Dose Calculator

Recommended Platelet Transfusion:

Fibrinogen Replacement Calculator

Recommended Cryoprecipitate:

Maximum Allowable Blood Loss (MABL) Calculator

Maximum Allowable Blood Loss:

🩸 Blood Products Quick Reference

🔴 PRBCs

💛 FFP

🌸 Platelets

💙 Cryoprecipitate

🚨 Emergency Transfusion

⚠️ Stop Transfusion If:

📞 When to Call Blood Bank: