Therapeutic plasma exchange in heart transplantation: role of coagulation assessment with thromboelastometry
© The Author(s) 2016
Received: 8 June 2016
Accepted: 11 October 2016
Published: 19 October 2016
Therapeutic plasma exchange (TPE) is a potentially life-saving procedure which effectively removes donor-specific human leukocyte antigen (HLA) antibodies from the bloodstream, allowing critically ill heart transplant recipients to receive a donor organ with less wait time, and reducing the risk of acute organ rejection. The bulk of coagulation factors is initially removed from the blood during TPE using albumin and is later replaced with allogeneic plasma. Coagulopathy may develop during TPE and then can persist due to intraoperative blood loss and hemodilution during surgery and cardiopulmonary bypass. We hereby describe the utility of rotational thromboelastometry to assess rapid coagulation changes during TPE and subsequent heart transplant (HT) surgery.
KeywordsCoagulation Plasma exchange Fresh frozen plasma Coagulation factor deficiency Heart transplantation
Therapeutic plasma exchange (TPE) is a procedure that is used to remove potentially harmful antibodies and toxins from a patient. It is indicated for many disease conditions including autoimmune anemia, autoimmune vasculitis, hemolytic uremic syndrome, and multiple sclerosis . TPE has been used in perioperative cardiac surgical patients with antibodies relating to heparin-induced thrombocytopenia , ABO incompatibility , and donor-specific human leukocyte antigen (HLA) . The latter antibodies (ABO and HLA) are pertinent to organ donor matching, and transplant recipients may suffer from long waits for organs due to incompatible antibodies. Perioperative removal of these antibodies via TPE is feasible and often life-saving for critically ill organ recipients.
Albumin (5 %) is useful as an exchange fluid for serial TPEs because of potential risks associated with a large amount of fresh frozen plasma (hereinafter referred to as plasma) . In particular, allergic reactions can occur in up to 40–65 % of patients undergoing multiple TPEs, although the severity of symptoms may vary [5–7]. It is thus routine at our institution to perform two plasma volume exchanges using 5 % albumin, followed by another TPE with plasma. The loss of coagulation factors during TPE is expected , but there is no strong evidence to support the superiority of plasma-only TPE over albumin/plasma combination for non-surgical TPE indications [5, 9]. Perioperative TPEs using albumin/plasma raise concerns about coagulation status because a single TPE with plasma may be insufficient to fully restore hemostatic factor levels before the use of cardiopulmonary bypass (CPB). Rotational thromboelastometry (TEM Innovations, Munich) was thus used to assess rapid coagulation changes during repeat TPEs in this case of a patient with donor-specific HLA antibodies who underwent a heart transplantation. The aim of this report is to address the clinical implications of TPE on coagulation and hemodynamic management in the transplant recipient.
A 43-year-old female, 66 kg, with non-ischemic cardiomyopathy (NICM) presented for HT. She was diagnosed with NICM 15 years ago, presumably related to pregnancy and/or systemic lupus erythematous (SLE). Her past medical history included SLE with associated nephritis and vasculitis, insulin-dependent diabetes mellitus, previous pulmonary embolism, and previous stroke with residual visual field defects.
The patient had been stable on a biventricular assist device (BiVAD; HeartWare, Framingham, MA, USA) for 2 years while no HLA-matched donor was found despite a 1b (moderate urgency) status. She was recently hospitalized for worsening right heart function and was requiring increased inotropic support. Given the decline in her clinical condition, the transplant team decided to use therapeutic plasma exchange (TPE), anti-lymphocyte antibody treatment, and intravenous immunoglobulin treatment in the perioperative period in order to accept a cross-match positive donor heart [4, 10].
The donor heart was implanted over 192 min of CPB with a cross-clamp time of 93 min and a donor ischemic time of 256 min. After transplant and reperfusion, the patient was initially weaned from CPB with inotropic support (epinephrine 0.06 μg/kg/min and norepinephrine 0.03 μg/kg/min). Diffuse microvascular bleeding was attributed to thrombocytopenia (EXTEM-A10, 31 mm) and low fibrinogen (FIBTEM-A10, 7 mm) (Fig. 1c). One pool of five single donor platelets and 20 units (four pools) of cryoprecipitate were transfused, and improved hemostasis was observed in the surgical field in conjunction with normalized EXTEM and FIBTEM A10 values (Fig. 1d).
In the post-CPB period, systolic dysfunction persisted on increasing doses of epinephrine and norepinephrine (up to 0.1 μg/kg/min) despite adding vasopressin (0.06 units/min) and milrinone (0.375 μg/kg/min). Levothyroxine (T4; 20 μg/kg bolus, followed by 5 μg/kg/h infusion) was added to treat “stunned” myocardium due to the long ischemic time as well as the potential for “euthyroid sick syndrome” exacerbated by TPE [11, 12].
The transplant heart’s systolic function improved with the T4 infusion, and further mechanical support (e.g., veno-arterial extracorporeal membrane oxygenation) was avoided. The patient remained stable in the intensive care unit (ICU), and the T4 infusion was weaned off along with other inotropes on postoperative day (POD) 2. In the ICU, four more sessions of TPE were performed to sustain the eradication of donor-specific antibodies; one plasma volume exchange with FFP on POD 1 and 2, and one plasma volume exchanged with 5 % albumin on POD 3 and 5 (plasma fibrinogen levels were above 150 mg/dL after TPEs). The patient was extubated on POD 5 and discharged from the hospital on POD 14.
Types of assays on rotational thromboelastometry
Extrinsic pathway, PLT count, fibrinolysis
Plasma, PCC, or PLTs
Cryo or fibrinogen conc.
Intrinsic pathway, PLT count, fibrinolysis
Plasma, protamine, or PLTs
Same as INTEM
In the USA, clinical use of fibrinogen concentrate is limited to hereditary afibrinogenemia and hypofibrinogenemia , and thus cryoprecipitate remains the mainstay therapy for perioperative fibrinogen replacement. The required amount (units) of cryoprecipitate can be estimated by multiplying the fibrinogen dose by five ; 3.77 × 5 = 18.9 units.
After transfusing 20 units of cryoprecipitate, FIBTEM-A10 and fibrinogen were 16 mm and 276 mg/dL, respectively.
Our case demonstrates the practical use of EXTEM and FIBTEM in monitoring perioperative changes in fibrinogen levels and the therapeutic effects of cryoprecipitate (Fig. 1c, d) during TPE. It is also important to note that antibiotics (ceftazidime, tobramycin, etc.) and immunosuppressants (basiliximab) can also be eliminated by TPE [26, 27].
In addition, TPE is known to affect biologically active hormones, including free thyroxine (T4) and triiodothyronine (T3) . Critically ill patients have limited reserves of thyroid hormones , and there is some evidence to suggest that there is better preservation and function of the donor heart using T3 or T4 infusion . Therefore, T4 infusion may be potentially useful for the management of stunned donor heart.
In conclusion, the use of TPE expands the donor organ pool to patients who otherwise would have an either a low probability of or a long wait before receiving a donor organ. In these patients, thromboelastometry throughout the perioperative period can allow for a fast detection of coagulopathy and targeted component therapy [25, 29].
AC: This author managed the patient, collected the data, and wrote the manuscript. JM, SD, ZK, SP: These authors contributed to the patient care, and helped write the manuscript.KT: This author managed the patient, and helped write the manuscript. All authors read and approved the final manuscript.
Kenichi A. Tanaka is currently participating in a clinical study sponsored by TEM Innovations (Munich, Germany). All other authors declare that they have no competing interests.
Consent for publication
Written informed consent was obtained from the patient for the publication of this report.
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