Protective environment for marrow transplant recipients: a prospective study.

Area of Science:

• Hematology
• Infectious Disease
• Transplantation Immunology

Background:

• Hematopoietic stem cell transplantation (HSCT) is a critical treatment for severe aplastic anemia and acute leukemia.
• Infection remains a major cause of morbidity and mortality post-HSCT.
• Strict isolation and decontamination protocols are employed to minimize infection risk.

Purpose of the Study:

• To evaluate the efficacy of laminar air flow (LAF) isolation and decontamination procedures.
• To assess the impact of these protocols on infection rates and survival in HSCT patients.
• To compare outcomes between patients undergoing HSCT with and without LAF isolation.

Main Methods:

• Prospective randomized study design.
• Inclusion of patients with aplastic anemia or acute leukemia undergoing HSCT from HLA-matched siblings.
• Randomization into two groups: LAF isolation and decontamination versus a control group.

Main Results:

• Patients in the LAF group experienced significantly lower rates of septicemia and major local infections.
• Overall survival at present was 19/46 in the LAF group versus 6/44 in the control group.
• Survival for aplastic anemia patients was 13/17 (LAF) vs. 4/17 (control); for acute leukemia, 6/29 (LAF) vs. 2/27 (control).

Conclusions:

• Laminar air flow isolation and decontamination significantly reduce infectious complications in HSCT recipients.
• While survival trends favored the LAF group, particularly in aplastic anemia, these differences did not reach statistical significance.
• Interstitial pneumonitis and recurrent leukemia were identified as major causes of mortality, unaffected by the isolation protocols.