Transfusion Management

Initial Response and Assessment

• If a transfusion reaction is suspected, stop the transfusion immediately, maintain IV access, and preserve the blood bag and tubing for investigation, as recommended by the American Society of Anesthesiologists 1
• Assess for signs and symptoms of transfusion reaction, including urticaria, rash, respiratory distress, increased peak airway pressure, decreased urine output, hemoglobinuria, microvascular bleeding, and fever or hyperthermia, as advised by the American Society of Anesthesiologists 1
• When a blood transfusion reaction is suspected, immediately stop the transfusion, maintain IV access, and assess the patient's ABCs (Airway, Breathing, Circulation) while initiating appropriate management based on reaction severity, as recommended by the American Society of Clinical Oncology 2

Diagnostic Testing and Monitoring

• Order diagnostic testing, such as complete blood count, coagulation studies, urinalysis, and blood cultures, to determine the cause of the transfusion reaction, as recommended by the American Society of Anesthesiologists 1
• Monitor vital signs, including heart rate, blood pressure, temperature, and respiratory rate, before, during, and after transfusion 3
• Watch for signs of transfusion reactions, such as tachycardia, rash, breathlessness, hypotension, or fever 3
• The following table summarizes the key points for monitoring and documentation:

Supportive Care and Transfusion Precautions

• Maintain adequate hydration with IV fluids and monitor urine output closely to prevent further complications, as recommended by the American Society of Anesthesiologists 1
• Do not continue transfusion until the cause of symptoms is determined, as advised by the American Society of Anesthesiologists 1
• Careful assessment of the need for transfusion, consideration of body weight dosing of blood components, and use of slow transfusion rates (1-2 mL/kg/hr) can help prevent Transfusion-Associated Circulatory Overload (TACO), especially in patients with risk factors such as age >70 years, pre-existing cardiac dysfunction, renal failure, hypoalbuminemia, low body weight, and positive fluid balance, as recommended by the American Society of Anesthesiologists 4
• Prophylactic diuretics before transfusion and splitting units of blood components with rest periods between units may also help prevent TACO, as recommended by the American Society of Anesthesiologists 4

Management of Transfusion Reactions

• Epinephrine 0.01 mg/kg (1 mg/mL dilution, max 0.5 mL) IM into lateral thigh; repeat every 5-15 minutes as needed, and fluid resuscitation with normal saline 1-2 L IV at 5-10 mL/kg in first 5 minutes; crystalloids or colloids in 20 mL/kg boluses are recommended by the American Society of Clinical Oncology for the management of blood transfusion reactions 2
• Antihistamines, such as diphenhydramine 50 mg IV plus ranitidine 50 mg IV, are recommended by the American Society of Clinical Oncology for the management of blood transfusion reactions 2
• The following management strategies are recommended for specific reaction symptoms:

Massive Bleeding and Transfusion Thresholds

• Follow the hospital's major hemorrhage protocol, as recommended by the Anaesthesia society 5
• Begin with aggressive volume resuscitation using intravenous isotonic crystalloids (0.9% NaCl or Ringer's lactate) as suggested by the American College of Cardiology 3
• Monitor for signs of ongoing bleeding and hemodynamic instability (systolic BP <90 mmHg or heart rate >110 beats/min) 6
• Obtain immediate hemoglobin, coagulation studies, and consider point-of-care testing for rapid assessment 7, 6
• Define massive bleeding as blood loss >1500 mL, >50% total blood volume lost in <3 hours, or bleeding >150 mL/min 6
• Consider a balanced ratio of blood components (RBC:FFP:platelets) 6
• A restrictive red blood cell transfusion threshold of 7-8 g/dL is recommended for most patients 7
• The American College of Cardiology recommends transfusing when Hb <7 g/dL for general patients 7, 6
• For cardiac patients or surgery, consider a higher threshold of 7.5-8 g/dL 7
• For postpartum hemorrhage, use a restrictive strategy guided by symptoms or Hb <6 g/dL 7
• For critically ill children, consider a transfusion threshold of 7 g/dL 6
• For children with congenital heart disease, consider higher thresholds based on cardiac abnormality (7-9 g/dL) 6

Alternatives to Transfusion and Informed Consent

• Artificial blood substitutes would be most beneficial in scenarios such as major hemorrhage situations, emergency trauma settings, military or disaster medicine, patients who refuse blood transfusions for religious reasons, surgical procedures with anticipated significant blood loss, remote locations without access to blood banking facilities, and situations with blood supply shortages or compatibility issues, as recommended by the British Journal of Anaesthesia 8
• Cell salvage techniques are a current alternative for certain patients, with indications including clean surgical wounds in procedures like open heart surgery, vascular surgery, joint replacements, spinal surgery, liver transplantation, and ruptured ectopic pregnancy, as indicated by the British Journal of Anaesthesia 8
• Contraindications for cell salvage techniques include bacterial contamination of operative field, blood containing fat or amniotic fluid, and caution in sickle cell disease, according to the British Journal of Anaesthesia 8
• Alternatives to transfusion include cell salvage techniques, acute normovolaemic hemodilution, pharmacological alternatives (e.g., erythropoietin), and non-intervention (and its consequences), as recommended by the British Journal of Anaesthesia 8
• The American Society of Anesthesiologists recommends that informed consent for blood transfusion must include documentation of the patient's agreement to the intervention and the discussions that led to that agreement, including specific risks, benefits, and alternatives to transfusion 9
• The American College of Surgeons suggests that the consent documentation should clearly record the purpose and benefits of transfusion, potential risks of transfusion, available alternatives to transfusion, and the patient's questions and the responses given 9