Document Detail

Respiration-induced changes in ear photoplethysmography relates to relative blood volume during hemodialysis.
MedLine Citation:
PMID:  21097195     Owner:  NLM     Status:  MEDLINE    
Renal failure patients provide a good model of fluid overload with the process of hemodialysis leading to central hypovolemia. This study aims to assess if hemodialysis induces identifiable changes in ear photoplethysmographic waveform variability (PPGV). The results are based on data collected from 10 kidney failure patients undergoing regular hemodialysis; classified as either fluid removal or non-fluid removal patients. Six minutes of continuous photoplethysmography (PPG) signals were recorded at pre-dialysis, end of dialysis and at regular intervals of 20 minutes during hemodialysis. Baseline and amplitude variabilities were derived from the PPG waveform. Frequency spectrum analysis was applied to these variability signals and spectral powers were then calculated from low frequency (LF), mid frequency (MF) and high frequency (HF) bands. The results indicate that in fluid removal patients, LF (p = 0.04), MF (p = 0.03) and HF (p = 0.0003) powers of amplitude ear PPGV (expressed in mean-scaled units) showed a significant increase at the end of dialysis compared to pre-dialysis. No significant change was observed in non-fluid removal patients. A moderate correlation was found between relative blood volume (RBV) and HF power (median R = 0.64, p 〈 0.05). This study suggests that ear PPG may be a suitable monitor of the systemic circulation and can provide a non-invasive tool to detect blood volume loss.
Faizan Javed; Gregory S H Chan; Andrey V Savkin; Paul M Middleton; James D Mackie; Nigel H Lovell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference     Volume:  2010     ISSN:  1557-170X     ISO Abbreviation:  Conf Proc IEEE Eng Med Biol Soc     Publication Date:  2010  
Date Detail:
Created Date:  2010-11-24     Completed Date:  2011-03-29     Revised Date:  2014-08-21    
Medline Journal Info:
Nlm Unique ID:  101243413     Medline TA:  Conf Proc IEEE Eng Med Biol Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  859-62     Citation Subset:  IM    
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MeSH Terms
Blood Volume*
Ear / blood supply,  physiopathology*
Kidney Failure, Chronic / diagnosis,  physiopathology*,  rehabilitation*
Photoplethysmography / methods*
Renal Dialysis*
Reproducibility of Results
Respiratory Mechanics*
Sensitivity and Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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