NDT Advance Access originally published online on February 5, 2009
Nephrology Dialysis Transplantation 2009 24(5):1378-1383; doi:10.1093/ndt/gfp018
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
© The Author [2009]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Comparison of methodologies to characterize haemoglobin variability in the US Medicare haemodialysis population
Chronic Disease Research Group, Minneapolis Medical Research Foundation, Minneapolis, MN, USA
Correspondence and offprint requests to: Thomas J. Arneson, Chronic Disease Research Group, Minneapolis Medical Research Foundation, 914 South 8th Street, Suite S-406, Minneapolis, MN 55404, USA. Tel: +1-612-347-5355; Fax: +1-612-347-5980; E-mail: tarneson@cdrg.org
Keywords: dialysis; haemoglobin levels; haemoglobin variability
| The first 150 words of the full text of this article appear below. |
| Introduction |
|---|
Anaemia is a common complication of renal failure [1]; its appropriate management is an important aspect of dialysis patient care [2]. Due to developments in anaemia management over the past 20 years, average haemoglobin levels have risen steadily and transfusion needs declined [1]. The concern about what constitutes appropriate anaemia management has increased due to results from clinical trials [3–5] and increasing costs of treatment [1]. Considerable month-to-month haemoglobin level change has been demonstrated [1,6–8] and two recent studies, using different methods to characterize haemoglobin variability, came to different conclusions regarding the association between haemoglobin variability and mortality [9,10].
Though many studies have analysed haemoglobin level distributions within dialysis patient populations (inter-patient variability) [8,11–13], and some have used a measure of individual-level haemoglobin variability over time (intra-patient variability) as an
| Methods |
|---|
Data sources and study population
| Definition and application of the four methodologies |
|---|
Standard deviation
Residual standard deviation
Fluctuations across thresholds
Haemoglobin cycling
| Discussion |
|---|
Study strengths and limitations
| Conclusion |
|---|