Replacement Solution for Intraoperative Plasmapheresis in Lung Transplantation
Fresh frozen plasma (FFP) is the standard replacement solution used for intraoperative plasmapheresis during lung transplantation, typically administered to a volume of 1.5 times the patient's systemic circulation. 1
Rationale and Evidence
The use of FFP as the replacement fluid during intraoperative therapeutic plasma exchange (iTPE) in lung transplantation is well-established, particularly for desensitization protocols in sensitized patients with donor-specific antibodies. The primary goal is to remove circulating antibodies while maintaining adequate coagulation factor levels.
Standard Protocol
- Volume: FFP is administered to achieve 1.5 times the patient's systemic circulation volume 1
- Purpose: Removes donor-specific antibodies while providing coagulation factors
- Efficacy: Can reduce mean fluorescence intensity of donor-specific antibodies from levels >5000 to undetectable on single antigen bead assay 1
Important Clinical Considerations
Coagulopathy Risk: Even when using FFP as the replacement solution, intraoperative plasmapheresis significantly disrupts the coagulation cascade and increases perioperative bleeding risk 2. Studies demonstrate:
- Increased odds of requiring large-volume perioperative transfusion (≥5 packed red blood cell units) with odds ratio of 1.9 3
- Mean perioperative pRBC transfusions of 4.2 units in patients receiving iTPE versus 2.9 units in those who did not 3
- Critical point: Despite increased bleeding, this does NOT translate to increased hemothorax requiring reoperation (5% in both groups) or 30-day mortality 3
Monitoring and Management
Point-of-care testing with rotational thromboelastometry (ROTEM) is valuable for real-time assessment of coagulopathy during the procedure 4. This allows for:
- Immediate identification of coagulation deficits
- Targeted correction with additional blood products
- Optimization of hemostasis
Alternative Considerations
While FFP is standard, the cardiac transplant literature mentions that albumin and/or crystalloid can be used for plasma exchange in other contexts 5. However, these alternatives would not provide coagulation factors and are not appropriate for the intraoperative lung transplant setting where maintaining hemostasis is critical.
Pathogen-inactivated FFP is preferred when available for plasmapheresis procedures 6, though this may not always be feasible in the urgent intraoperative setting.
Practical Algorithm
- Pre-procedure: Ensure adequate FFP availability (calculate 1.5× patient's blood volume)
- During exchange: Use FFP as sole replacement fluid
- Monitor: Employ ROTEM or standard coagulation testing
- Anticipate: Prepare for increased transfusion requirements (average 4-5 units pRBC)
- Supplement: Have platelets and cryoprecipitate available for targeted correction
The increased bleeding risk with iTPE is manageable and should not deter its use in appropriately selected sensitized patients, as it significantly expands access to transplantation without compromising survival outcomes 3.