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Bronchoalveolar lavage cell composition in allogeneic bone marrow transplant patients without symptomatic lung
R de la Cámara1, R Girón, C Marrón
1Servicio de Hematología, Hospital de la Princesa, Madrid, Spain.
Insights
Bronchoalveolar lavage (BAL) fluid in bone marrow transplant (BMT) patients shows increased neutrophils and lymphocytes compared to healthy individuals. Caution is advised when interpreting BAL data in BMT patients due to these differences.
Area of Science:
- Immunology
- Hematology
- Pulmonology
Background:
- Allogeneic bone marrow transplantation (BMT) can lead to pulmonary complications.
- Understanding bronchoalveolar lavage (BAL) fluid cytology is crucial for monitoring BMT patients.
- Baseline cytological data in BMT patients without lung issues is needed for comparison.
Purpose of the Study:
- To analyze the cellular composition of BAL fluid in allogeneic BMT patients without lung complications.
- To compare BAL fluid cytology between BMT patients and healthy volunteers.
- To establish a reference range for BAL cytology in BMT recipients.
Main Methods:
- Collected and analyzed BAL fluid samples from 56 allogeneic BMT patients within 6 months post-transplant.
- Performed differential and total cell counts on 98 BAL samples.
- Compared patient data with samples from healthy volunteers.
Main Results:
- BAL fluid in BMT patients showed significantly higher neutrophils and lymphocytes compared to healthy controls.
- Macrophages were decreased, while eosinophils remained similar between groups.
- Increased neutrophils (neutrophilic alveolitis) were noted in patients with asymptomatic cytomegalovirus (CMV) detected via BAL.
- Significant variability in cellular composition was observed in BMT patients.
Conclusions:
- BAL fluid cytology differs significantly between BMT patients and healthy individuals.
- Interpreting BAL findings in BMT patients with lung complications requires comparison with BMT controls, not healthy volunteers.
- The distinct cellular profile in BMT patients necessitates careful consideration when diagnosing pulmonary issues post-transplant.
Abstract:
The purpose of this study was to assess the cytological composition of bronchoalveolar lavage (BAL) fluid in allogeneic BMT patients without lung complications and compare it with that obtained from healthy volunteers. During the first 6 months post-BMT we studied the differential cell counts of 98 BALs from 56 patients as well as the total cell count of 44 BALs from 27 patients. The BAL cellular composition in BMT patients was clearly different from that of healthy subjects: there was a marked increase in alveolar neutrophils (in 82% of the patients when sequential BALs were performed) and an increase in lymphocytes, with a lower percentage of macrophages and similar numbers of eosinophils. A greater variation in cellular populations was found without an evident cause. The total number of cells per ml of fluid recovered appeared similar to that of healthy volunteers. A high frequency of neutrophilic alveolitis was found in patients with asymptomatic CMV on BAL. Owing to the variability of BAL cellular composition in asymptomatic BMT patients and its difference from that in healthy volunteers, great caution should be taken when interpreting the BAL composition data from patients with lung complications. In order to avoid drawing wrong conclusions these data should be compared with those obtained from a control group of BMT patients without lung complications and not from healthy volunteers.