Document Detail

A novel method of measuring human lymphatic pumping using indocyanine green fluorescence lymphography.
MedLine Citation:
PMID:  20619581     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: Lymph transportation through the body is partly controlled by the intrinsic pumping of lymphatic vessels. Although an understanding of this process is important for medical application, little is currently known because it is difficult to measure. Here, we introduce an easy, safe, and cost-effective technique for measuring lymphatic pumping in leg superficial lymphatic vessels. Readings obtained with this technique were compared with values obtained with dynamic lymphoscintigraphy. Differences in lymphatic pumping between healthy volunteers and patients with lymphedema were also investigated.
METHODS: Indocyanine green (ICG) fluorescence lymphography was performed by subcutaneously injecting 0.3 mL of ICG (0.5%) into the dorsum of the foot. Real-time fluorescence images of lymph propulsion were obtained with an infrared-light camera system with the individual supine or sitting. A custom-made transparent sphygmomanometer cuff was wrapped around the lower leg and connected to a standard mercury sphygmomanometer. The cuff was inflated to 60 mm Hg and then gradually deflated at 5-minute intervals to lower the pressure by 10-mm Hg steps until the fluorescence contrast agent exceeded the upper border of the cuff, indicating that the lymphatic contraction had overcome the cuff pressure. Lymph pumping pressure (P(pump)) was defined as the value of the cuff pressure when the contrast agent exceeded the upper border of the cuff. We measured P(pump) among healthy volunteers who maintained a supine position and compared these values with measurements obtained from lymphoscintigraphy. P(pump) values while sitting were also compared between 30 legs from healthy volunteers and 30 legs from lymphedematous patients.
RESULTS: Among healthy, supine participants, P(pump) was 25.2 ± 16.7 mm Hg (mean ± standard deviation [SD]) when measured by ICG fluorescence lymphography. These values were significantly correlated with values taken using dynamic lymphoscintigraphy (r(2) = 0.54, p < .01), while 2 SDs of the mean were approximately 20 mm Hg, suggesting a substantial disagreement between the two methods (Bland-Altman plots). In the comparison of seated measurements, readings for healthy participants (P(pump) = 29.3 ± 16.0) were higher than those for lymphedematous participants (13.2 ± 14.9).
CONCLUSION: ICG fluorescence is an accurate-as well as a safe, easy, and economical-method of measuring lymphatic pumping. Therefore, it may develop as a vital tool for diagnosing lymphatic malfunctions even when they are only in their formative stages. Studies that use this technique may increase our knowledge of the lymphatic system as a whole, allowing us to develop better treatments for lymphatic disorders.
Naoki Unno; Motohiro Nishiyama; Minoru Suzuki; Hiroki Tanaka; Naoto Yamamoto; Daisuke Sagara; Yuuki Mano; Hiroyuki Konno
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of vascular surgery     Volume:  52     ISSN:  1097-6809     ISO Abbreviation:  J. Vasc. Surg.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-04     Completed Date:  2010-10-28     Revised Date:  2012-10-03    
Medline Journal Info:
Nlm Unique ID:  8407742     Medline TA:  J Vasc Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  946-52     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Society for Vascular Surgery. Published by Mosby, Inc. All rights reserved.
Division of Vascular Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan.
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MeSH Terms
Aged, 80 and over
Case-Control Studies
Fluorescent Dyes / administration & dosage,  diagnostic use*
Indocyanine Green / administration & dosage,  diagnostic use*
Injections, Subcutaneous
Lower Extremity
Lymphatic Vessels / physiopathology*,  radionuclide imaging
Lymphedema / diagnosis*,  physiopathology,  radionuclide imaging
Lymphography / methods*
Middle Aged
Patient Positioning
Predictive Value of Tests
Radionuclide Imaging
Supine Position
Reg. No./Substance:
0/Fluorescent Dyes; 3599-32-4/Indocyanine Green

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