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Venous filling time using air-plethysmography correlates highly with great saphenous vein reflux time using duplex.
Phlebology. 2014 Mar; 29(2):90-7.P

Abstract

OBJECTIVES

Venous filling time (VFT90) is the time taken to reach 90% of the venous volume in the calf. It is recorded by air-plethysmography (APG(®)) and is assumed to measure global venous reflux duration. However, this has never been confirmed by duplex. The aim of the study was to compare VFT on APG to venous reflux time/duration (RT) measured simultaneously with duplex on the same patients.

METHOD

Twenty-six consecutive patients, M:F = 16:10, age (25-78), C1 = 1, C2 = 4, C3 = 8, C4a = 6, C4b = 4, C5 = 2, C6 = 1, underwent simultaneous APG with duplex. The venous filling index (VFI, mL/second), VFT90 (seconds), great saphenous vein (GSV) RT on duplex, averaged thigh GSV diameter and thigh length (length) between the APG sensor air-cuff and duplex transducer were recorded. The VFT100 was calculated by VFT90/0.9. The additional time taken to fill the thigh was achieved using the VFI, length and deep vein diameter (d), to determine the corrected reflux duration: CRD = VFT100 + (length × πd(2)/4 (1/VFI)).

RESULTS

Twenty-five patients are presented. One patient with very mild reflux (VFT90 = 55.9 seconds) had an indeterminate endpoint on duplex and was excluded. The median (range) VFI and GSV diameter was 4.9(1.3-15.5) mL/second and 7(4-17) mm, respectively. The VFT90 and VFT100 both correlated with RT on duplex (Spearman, P < 0.0005) at: r = 0.933, r(2) linear = 0.72 and r = 0.933, r(2) linear = 0.68, respectively. The median (interquartile range) filling time with VFT90 was less than the duplex RT at 24 (16.9) versus 28 (20) seconds respectively, P < 0.0005 (Wilcoxon). The median percentage underestimation improved from 24% to 16% and then 4% using the VFT90, VFT100 and CRD, respectively.

CONCLUSIONS

This is the first study to compare APG parameters with duplex by performing simultaneous measurements. There was an excellent correlation between the VFT90 versus duplex RT, thereby comparing reverse flow in a single superficial vein against the legs overall venous haemodynamic status. These tests can both be used in the quantification of reflux.

Authors+Show Affiliations

Ealing Hospital & Imperial College, London SW7 2AZ, UK.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23035010

Citation

Lattimer, C R., et al. "Venous Filling Time Using Air-plethysmography Correlates Highly With Great Saphenous Vein Reflux Time Using Duplex." Phlebology, vol. 29, no. 2, 2014, pp. 90-7.
Lattimer CR, Azzam M, Kalodiki E, et al. Venous filling time using air-plethysmography correlates highly with great saphenous vein reflux time using duplex. Phlebology. 2014;29(2):90-7.
Lattimer, C. R., Azzam, M., Kalodiki, E., & Geroulakos, G. (2014). Venous filling time using air-plethysmography correlates highly with great saphenous vein reflux time using duplex. Phlebology, 29(2), 90-7. https://doi.org/10.1258/phleb.2012.012042
Lattimer CR, et al. Venous Filling Time Using Air-plethysmography Correlates Highly With Great Saphenous Vein Reflux Time Using Duplex. Phlebology. 2014;29(2):90-7. PubMed PMID: 23035010.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Venous filling time using air-plethysmography correlates highly with great saphenous vein reflux time using duplex. AU - Lattimer,C R, AU - Azzam,M, AU - Kalodiki,E, AU - Geroulakos,G, Y1 - 2013/05/06/ PY - 2012/10/5/entrez PY - 2012/10/5/pubmed PY - 2014/11/15/medline KW - air-plethysmography KW - chronic venous insufficiency KW - duplex ultrasound KW - varicose veins KW - venous filling time KW - venous reflux time SP - 90 EP - 7 JF - Phlebology JO - Phlebology VL - 29 IS - 2 N2 - OBJECTIVES: Venous filling time (VFT90) is the time taken to reach 90% of the venous volume in the calf. It is recorded by air-plethysmography (APG(®)) and is assumed to measure global venous reflux duration. However, this has never been confirmed by duplex. The aim of the study was to compare VFT on APG to venous reflux time/duration (RT) measured simultaneously with duplex on the same patients. METHOD: Twenty-six consecutive patients, M:F = 16:10, age (25-78), C1 = 1, C2 = 4, C3 = 8, C4a = 6, C4b = 4, C5 = 2, C6 = 1, underwent simultaneous APG with duplex. The venous filling index (VFI, mL/second), VFT90 (seconds), great saphenous vein (GSV) RT on duplex, averaged thigh GSV diameter and thigh length (length) between the APG sensor air-cuff and duplex transducer were recorded. The VFT100 was calculated by VFT90/0.9. The additional time taken to fill the thigh was achieved using the VFI, length and deep vein diameter (d), to determine the corrected reflux duration: CRD = VFT100 + (length × πd(2)/4 (1/VFI)). RESULTS: Twenty-five patients are presented. One patient with very mild reflux (VFT90 = 55.9 seconds) had an indeterminate endpoint on duplex and was excluded. The median (range) VFI and GSV diameter was 4.9(1.3-15.5) mL/second and 7(4-17) mm, respectively. The VFT90 and VFT100 both correlated with RT on duplex (Spearman, P < 0.0005) at: r = 0.933, r(2) linear = 0.72 and r = 0.933, r(2) linear = 0.68, respectively. The median (interquartile range) filling time with VFT90 was less than the duplex RT at 24 (16.9) versus 28 (20) seconds respectively, P < 0.0005 (Wilcoxon). The median percentage underestimation improved from 24% to 16% and then 4% using the VFT90, VFT100 and CRD, respectively. CONCLUSIONS: This is the first study to compare APG parameters with duplex by performing simultaneous measurements. There was an excellent correlation between the VFT90 versus duplex RT, thereby comparing reverse flow in a single superficial vein against the legs overall venous haemodynamic status. These tests can both be used in the quantification of reflux. SN - 1758-1125 UR - https://www.unboundmedicine.com/medline/citation/23035010/Venous_filling_time_using_air_plethysmography_correlates_highly_with_great_saphenous_vein_reflux_time_using_duplex_ L2 - https://journals.sagepub.com/doi/10.1258/phleb.2012.012042?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -