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Titolo:
Venous outflow and inflow resistance in health and venous disease
Autore:
Fronek, A; Minn, C; Kim, R;
Indirizzi:
Univ Calif San Diego, Dept Surg & Bioengn, San Diego, CA 92103 USA Univ Calif San Diego San Diego CA USA 92103 engn, San Diego, CA 92103 USA
Titolo Testata:
JOURNAL OF VASCULAR SURGERY
fascicolo: 3, volume: 31, anno: 2000,
pagine: 472 - 476
SICI:
0741-5214(200003)31:3<472:VOAIRI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT-REFLECTION RHEOGRAPHY; PHOTOPLETHYSMOGRAPHY; INSUFFICIENCY; DIAGNOSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Fronek, A Univ Calif San Diego, Mail Code 0643, La Jolla, CA 92093 USA Univ Calif San Diego Mail Code 0643 La Jolla CA USA 92093 93 USA
Citazione:
A. Fronek et al., "Venous outflow and inflow resistance in health and venous disease", J VASC SURG, 31(3), 2000, pp. 472-476

Abstract

Purpose: The purpose of this study was to develop a physiologic method to measure out-flow and inflow from the lower extremities and thus to quantifythe degree of venous valvular insufficiency and venous obstructive disease. Methods: Calibrated photoplethysmography was used in combination with passive changes in hydrostatic pressure, by leg elevation followed by repositioning of the leg to the original sitting position, With the principle of venous occlusion plethysmography, timed volume changes were then used to calculate the outflow and inflow. The inflow and outflow units were the percentage of optical reflectance (%OR) per minute. The respective resistances werecalculated by identifying the hydrostatic pressure distance from the thirdintercostal space to the probe site that is inducing these site changes. The resistance units were millimeters of Mercury x minutes per %ORResults: I;our groups of subjects were examined: normal individuals, patients with venous valvular insufficiency, deep venous thrombosis, and a combination of both, The most significant differences in outflow values were found between the control group (81.77% OR/min) and the deep venous thrombosisgroup (28.47% OR/min). In contrast, the most significant differences in inflow values were found between the control group (9.67% OR/min) and the venous valvular insufficiency group (108.61% OR/min). The resistances changed correspondinglyConclusion: The application of calibrated photoplethysmography in conjunction with induced changes in leg hydrostatic pressure proved to be an effective physiologic method to noninvasively quantity venous hemodynamics in normal control subjects, patients with venous valvular insufficiency venous obstructive disease, or both.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 09:44:16