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Between 1981 and 2010, we have treated 40 patients requiring chronic transfusion with periodic manual erythrocyte exchange and autologous plasma rescue (MEEX). Here, we present retrospective, long-term (median 22, range 14–29 years) follow-up data for a subset of seven patients with sickle cell syndromes who did not respond to hydroxyurea (HU). Patient characteristics are listed in Supporting Information, Tables I and II. MEEX was accomplished by using a single venous access and infusing 500 ml of isotonic solution (for adults) and removing 500 ml blood (range 400–600 ml according to the patient's weight and the physician's discretion). The rescue process involves centrifugation of the collected blood product and reinfusion of autologous plasma. This is followed by another 500 ml phlebotomy and the infusion of 2–3 units of packed Rh-matched, leuko-filtered, plasma-depleted red cells, with the aim of lowering HbS levels to around 40%. For pediatric patients, the bleeding volume is smaller (5–10 cc/Kg) and the volumes of infused saline and packed Rh-matched, leuko-filtered, plasma-depleted red cells are equal to the phlebotomy volumes, without plasma rescue.

The interval between each MEEX procedure for these seven patients ranged from 45 to 90 days to maintain at all times HbS concentrations below 60–70% and the median number of procedures was 133 (range 85–204). None of the seven patients experienced acute complications of sickle cell disease (SCD), such as acute chest syndrome, splenic sequestration, stroke, bone necrosis, or priapism, or long-term complications such as renal failure, cerebrovascular or retinal damage, or pseudoxanthoma-like manifestations. None of the seven patients experienced alloimmunization and all but one patient had normal liver iron concentrations [assessed by superconducting quantum interference device, magnetic iron detector, magnetic resonance imaging (MRI), or biopsy]. This patient, who started the program at the age of 26 years with iron overload due to previous transfusions, required regular iron chelation therapy. Cardiac function tests indicated that all subjects had a left ventricular ejection fraction of >60% and cardiac Tmath image > 20 mms (measured by MRI). There was no evidence of pulmonary arterial hypertension on echocardiography.

During the observation period, five patients required hospitalization (four with acute cholecystitis and one due to venous occlusive crisis). Only one patient requires chronic analgesia (to relieve pain caused by pre-existing femur head necrosis).

Automated EEX (AEEX) ensures lower postprocedural HbS levels (30% HbS vs. 40% with our MEEX protocol) because it makes use of two distal ports to increase the volume of red cells removed. However, the larger number of transfused units in AEEX exposes the patient to a higher transfusional risk. In addition, the automated procedure is significantly more expensive than the manual one, as indicated in Table I.

Table I. Estimated Annual Treatment Costsa for Chronic Transfusion Therapy: Comparison of Simple Transfusion Versus Manual, or Automated Erythroexchange
 STT €/yearMEEX €/yearAEEX €/year
  • Costs quantified according to prices applied by local health authorities and tax free.

  • STT, simple transfusion therapy; MEEX, manual erythroexchange; AEEX, automated erythroexchange.

  • a

    Costs estimates for a 55-Kg patient based on:

  • STT = 2: filtered, washed, without buffy coat red blood cell units (250 ml Ht 80%)/4 week [RIGHTWARDS ARROW] 249/RBC U € × 2 = 498 €.

  • Desferoxamine f. 2g [RIGHTWARDS ARROW] 11.05 € (40 mg/kg × 5 days/week = 11 g/week [RIGHTWARDS ARROW] 5 f/week × 52 weeks/year).

  • MEEX = 2: filtered, washed, without buffy coat red blood cell units per procedure (498 €) × 6 procedures/year.

  • Consumables total 509.12 €/procedure, based on: saline solution 500 ml/procedure = 0.9 €; needle/procedure = 0.52 €; quadruple transfusion bag = 6.4 €; single transfusion bag = 3.3 €.

  • EEX = 6 filtered, washed, without buffy coat red blood cell units per procedure [RIGHTWARDS ARROW] 249/RBC U € × 6 = 1494 €.

  • Consumables total 2119.12 €/procedure, based on: kit for flow cell separator/procedure (625 €) × 4 procedures/year; calcium gluconate per procedure = 0.12 €.

RBC U/year5976 € (24 U/year)2988 € (24 U/year)5976 € (24 U/year)
Desferoxamine2873 €  
Consumables 66.72 €/year2500.48 €/year
Total cost8849 €3054.72 €8476.48 €

Previous studies have indicated that EEX is a safe and efficacious alternative to both HU and simple transfusions for preventing complications of SCD and improving patients' quality of life [1, 2]. Our results with MEEX confirm previous findings including that if MEEX is started before significant iron overload occurs, the need for chelation therapy may be obviated [3]. Given the relative simplicity and the lower cost, MEEX should be considered for chronic transfusion therapy in developing countries [4].

Acknowledgements

  1. Top of page
  2. Acknowledgements
  3. References
  4. Supporting Information

The authors thank Jane Tricker and Dr. Silvia Caviglia for editorial assistance in the preparation of this article.

References

  1. Top of page
  2. Acknowledgements
  3. References
  4. Supporting Information

Supporting Information

  1. Top of page
  2. Acknowledgements
  3. References
  4. Supporting Information

Additional Supporting Information may be found in the online version of this article.

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AJH_21895_sm_suppinfo.doc48KSupporting Information

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