Monday, March 12, 2012

Temporary impairment of reticulocyte haemoglobin content in subjects with community-acquired pneumonia

Summary

Introduction:  In the case of inflammation, imbalance of iron homoeostasis is caused by increased retention of iron within cells of the reticuloendothelial system. Iron-restricted erythropoiesis occurs because of decreased availability of iron for haemoglobin (Hb) synthesis in erythroid progenitor cells.

Deviations in reticulocyte haemoglobin (Ret-He) content are investigated together with inflammation markers in subjects with community-acquired pneumonia (CAP). Short-term alterations with regard to Ret-He during and after completing antibiotic treatment are investigated.

Methods:  A total of 75 patients, classified into three subgroups with CURB-65 scores of ≤1, 2 and ≥3, participated in the study.

Results:  Within the three subgroups, Hb results demonstrate a decline from the day of admission until day 4. From day 4, an increase towards higher values is observed at day 14. Within 24 h after admission, Ret-He results are situated within the lower quartile region of the reference range interval. Until day 4 of hospital admission, a steady trend towards a decline of 3–8% is established. During antibiotic treatment, an increase in reticulocyte count occurs from 0.039 ± 0.014 × 1012/L at day 4 to 0.057 ± 0.020 × 1012/L at day 14 (mean ± SD). Recovery of Hb and Ret-He occurs towards values within the reference range.

Conclusion:  In subjects with CAP, acute inflammation results in impairment of Ret-He at an early stage. After onset of pneumonia, decreased results of Ret-He and Ret-He/RBC-He ratio are demonstrated, reflecting acute erythropoietic dysfunction, which are amongst others caused by functional iron depletion.

1 comment:

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