Plasma Fresco Congelado: Uso y Administración

Consideraciones Generales

• La dosis recomendada de plasma fresco congelado (PFC) es de 10-15 ml/kg de peso corporal, según la Critical Care y Anaesthesia 1, 2, 3, 4
• El PFC contiene todos los factores de coagulación solubles, incluyendo los factores lábiles V y VIII, y su uso está indicado principalmente en situaciones específicas de coagulopatía y hemorragia 2, 3

Características del PFC

• El volumen aproximado por unidad de PFC es de 250-300 ml 2, 3
• El contenido de fibrinógeno de cuatro unidades de PFC es aproximadamente 2 g 3
• El PFC debe ser del mismo grupo sanguíneo que el paciente (grupo AB si se desconoce el grupo) 3

Indicaciones para el Uso de PFC

• El PFC está indicado en hemorragia masiva o significativa complicada por coagulopatía (TP o TTPa más de 1,5 veces el control) 1, 4
• El PFC está indicado para reemplazo de factores de coagulación durante hemorragia mayor, particularmente en trauma y obstetricia 3
• El PFC está indicado para coagulación intravascular diseminada (CID) aguda con sangrado 3
• El PFC está indicado para pacientes con sangrado activo y un INR > 1,5 3

Consideraciones Especiales y Precauciones

• No se recomienda el uso de PFC para corregir cualquier deficiencia de factor de coagulación en pacientes con cirrosis, ya que puede aumentar significativamente la presión portal 5
• No se recomienda el uso de PFC para el manejo de anomalías leves-moderadas de coagulación en pacientes críticos no sangrantes antes de procedimientos invasivos 3
• El PFC puede descongelarse usando un horno seco (10 min), microondas (2-3 min) o en baño de agua (20 min) 3
• Una vez descongelado, el PFC puede usarse hasta por 24 horas si se almacena a 4°C 3

Riesgos Asociados

• El uso de PFC puede asociarse con sobrecarga circulatoria 1
• El uso de PFC puede asociarse con incompatibilidad ABO 1
• El uso de PFC puede asociarse con transmisión de enfermedades infecciosas 1
• El uso de PFC puede asociarse con reacciones alérgicas leves 2
• El uso de PFC puede asociarse con lesión pulmonar aguda relacionada con la transfusión (TRALI) 4

Alternativas al PFC

• Para la hipofibrinogenemia, el crioprecipitado puede ser más efectivo 3, 5
• Para la reversión de anticoagulantes orales en situaciones de emergencia, el concentrado de complejo protrombínico (CCP) debe preferirse al PFC 3

Fresh Frozen Plasma Dosing Guidelines

Standard Dosing Guidelines

• The American Society of Anesthesiologists recommends administering 10-15 ml/kg FFP as the initial dose for correction of coagulopathy with bleeding, which typically translates to 2-4 units (500-1000 ml) for an average 70 kg adult 6, 7
• For urgent warfarin reversal, lower doses of 5-8 ml/kg FFP are usually sufficient, representing approximately 1-2 units for most adults 6

Dose-Response Relationship

• Studies have shown that higher doses of FFP are more effective at correcting coagulopathy, with a median dose of 8 ml/kg showing better response than 4 ml/kg in some patient populations 8, 9

Clinical Context for Dosing

• FFP is indicated when PT > 1.5 times normal or INR > 2.0, or aPTT > 2 times normal with microvascular bleeding, and in cases of massive transfusion (>1 blood volume or ~70 ml/kg) with ongoing bleeding when coagulation tests are unavailable 6
• FFP is also indicated for specific coagulation factor deficiencies without available concentrates 6

Critical Dosing Considerations

• Doses below 10 ml/kg are unlikely to achieve the 30% factor concentration threshold needed for hemostasis, and prophylactic FFP in non-bleeding patients with coagulopathy does not prevent bleeding and increases transfusion-related complications 6
• Coagulation parameters should be rechecked after transfusion to determine the need for additional doses 6, 7

Special Population: Hereditary Angioedema

• For acute HAE attacks when specific therapies are unavailable, doses of 10-15 ml/kg FFP have shown effectiveness, with response times slower than specific therapies (median 4 hours vs. minutes) 8, 9

Important Safety Warnings

• FFP carries significant risks, including transfusion-related acute lung injury (TRALI), circulatory overload, ABO incompatibility, and infectious disease transmission 7
• FFP is not indicated for volume expansion or albumin replacement, prophylaxis in non-bleeding patients with mild coagulopathy, or correction of coagulopathy in cirrhotic patients without bleeding 6

Fresh Frozen Plasma Administration Guidelines

Practical Administration

• Fresh frozen plasma should be infused as rapidly as clinically tolerated in acute bleeding situations, with the primary goal being rapid correction of coagulopathy rather than adhering to a specific infusion rate, as recommended by the American Society of Anesthesiologists 10
• FFP can be thawed using three methods with varying times: dry oven (10 minutes), microwave (2-3 minutes), and the standard therapeutic dose is 15 ml/kg body weight 10
• Once thawed, FFP must be used within 30 minutes if removed from refrigeration, and thawed FFP stored at 4°C can be used for up to 24 hours 10
• The infusion rate must account for the therapeutic dose required, with a standard therapeutic dose of 15 ml/kg body weight, equivalent to approximately 1,050 ml (3-4 units of 250-300 ml each) for a 70 kg patient 10, 11

Critical Considerations

• The blood bank should be alerted immediately to facilitate timely preparation, and FFP should be administered in conjunction with packed RBCs (8-10 units) in massive hemorrhage to avoid further clotting factor loss, as suggested by the International Society on Thrombosis and Haemostasis 12
• Minimizing delays in FFP administration is crucial, and monitoring for circulatory overload (TACO), transfusion-related acute lung injury (TRALI), and citrate toxicity with massive transfusion (hypocalcemia/hypomagnesemia) is necessary 10, 11

FFP Dosing for Prolonged APTT

Clinical Context Determines FFP Administration

• The American Society of Anesthesiologists recommends an initial dose of 4 units of FFP (approximately 10-15 ml/kg) for a prolonged APTT with active bleeding, which provides roughly 1000 ml for an average 70 kg adult 13
• The American College of Surgeons suggests maintaining a 1:1 ratio of RBC:FFP if massive transfusion is ongoing until coagulation results are available 13, 14

Specific Clinical Scenarios

• In obstetric hemorrhage, the Royal College of Obstetricians and Gynaecologists recommends withholding FFP until 4 units of RBC have been transfused, unless early coagulopathy is diagnosed on coagulation testing 13, 14
• The American College of Obstetricians and Gynecologists advises that after 4 units RBC with ongoing bleeding, 4 units FFP should be given and a 1:1 ratio maintained until coagulation results are available 13, 14

Critical Dosing Thresholds

• The British Society for Haematology states that APTT must be >1.5 times normal (or >2 times normal per some guidelines) with active bleeding to justify FFP transfusion 15, 16
• The International Society on Thrombosis and Haemostasis indicates that PT >1.5 times mean normal value correlates with increased risk of clinical coagulopathy 15

Important Caveats

• The American Society of Anesthesiologists prioritizes fibrinogen replacement, as hypofibrinogenaemia is the most common factor deficiency, occurring before APTT prolongation 13, 14
• The Society of Critical Care Medicine recommends prioritizing cryoprecipitate over FFP if fibrinogen <1.5 g/L (or <2 g/L in obstetrics) 17, 16

Fresh Frozen Plasma Transfusion Indications

Definitive Indications for FFP Transfusion

• The American Society of Anesthesiologists recommends administering FFP in massive bleeding (>10 units RBC in 24 hours or >6 units in 6 hours) using high-ratio transfusion strategies of at least 1:2 FFP:RBC, ideally approaching 1:1 in trauma patients 18
• FFP is indicated primarily for major hemorrhage with documented or presumed coagulopathy, with an initial dose of 10-15 ml/kg, and should be administered early in massive bleeding rather than waiting for laboratory confirmation 19

Absolute Contraindications and Inappropriate Uses

• The American College of Critical Care Medicine advises against using FFP for prophylactic correction of abnormal coagulation tests (PT, APTT) prior to low-risk invasive procedures in critically ill, hemodynamically stable patients 19
• FFP should not be used for volume replacement or hypovolemia—use crystalloids or colloids instead 19

Important Limitations and Alternatives

• The American Society of Anesthesiologists notes that FFP has relatively low fibrinogen content (four units contain only approximately 2 g fibrinogen), making it inefficient for isolated fibrinogen replacement 19
• For hypofibrinogenemia (<1.0-1.5 g/L): The American College of Critical Care Medicine recommends using cryoprecipitate or fibrinogen concentrate instead of FFP, as these are more effective and efficient 19

Serious Risks and Monitoring

• The Society of Critical Care Medicine warns that transfusion-related acute lung injury (TRALI) is the most serious complication, with FFP and platelets being the most frequently implicated products 19, 20
• The American College of Critical Care Medicine advises monitoring for signs of circulatory overload, TRALI, and metabolic derangements during massive transfusion, and measuring hemoglobin and coagulation parameters before and after FFP transfusion to determine need for additional doses 19, 20

Fresh Frozen Plasma Dosing Guidelines

Special Populations

• For factor X deficiency, the American Society of Hematology recommends FFP dosing to target trough factor X levels above 10-20 IU/dL, using 20 ml/kg followed by 3-6 ml/kg twice daily, although plasma-derived factor X concentrate or prothrombin complex concentrates are preferred over FFP when available 21

Management of Critical Coagulopathy

Understanding the Clinical Error

• FFP is indicated for active bleeding or planned invasive procedures when INR >2.0, and this patient has an INR of 20, which is 10 times the threshold for FFP transfusion, according to the American Society of Anesthesiologists 22
• PRBC transfusion is indicated for anemia or blood loss, not for coagulopathy correction, as stated by the Society of Critical Care Medicine 23, 24
• With a hemoglobin level of "low red blood cell count", there was no indication whatsoever for PRBC, as per the guidelines from the American College of Critical Care Medicine 23

Immediate Action Required

• The American Society of Anesthesiologists recommends administering FFP immediately using a dose of 10-15 ml/kg body weight, approximately 700-1050 ml or 3-4 units for a 70 kg patient 22
• Ensure ABO compatibility by using the same blood group as the patient, or AB if unknown, as advised by the American Association of Blood Banks 22

Critical Considerations for This Case

• INR of 20 represents severe coagulation factor deficiency requiring immediate correction, according to the American College of Gastroenterology 22
• Even though the patient is currently hemodynamically stable, spontaneous life-threatening bleeding can occur at any moment with such severe coagulopathy, as warned by the European Association for the Study of the Liver 25
• FFP contains all coagulation factors needed to reverse this critical state, as stated by the American Society of Anesthesiologists 22

Additional Management Steps

• The American College of Gastroenterology recommends administering vitamin K 10 mg IV if warfarin-induced coagulopathy is suspected, though the effect takes hours 25
• Consider prothrombin complex concentrate (PCC) if available, as it may be more effective than FFP alone for rapid reversal, as suggested by the American Society of Anesthesiologists 22
• Hold all anticoagulant medications immediately, as advised by the American Heart Association 22

Monitoring Requirements

• Monitor for signs of bleeding, such as neurological changes, abdominal pain, or muscle pain, as recommended by the European Association for the Study of the Liver 25
• Watch for transfusion complications, such as TRALI, circulatory overload, or allergic reactions, as warned by the American Association of Blood Banks 26, 22

Special Considerations

• If the patient has cirrhosis, FFP may still be indicated despite balanced hemostasis, given the extreme INR elevation, as stated by the European Association for the Study of the Liver 26, 25
• Consider fibrinogen concentrate or cryoprecipitate as alternatives if fibrinogen is low, as suggested by the American Society of Anesthesiologists 26, 22