Ambulatory strain‐gauge plethysmography and blood volume scintimetry for quantitative assessment of venous insufficiency

Abstract

In the present study, a strain-guage plethysmographic method (ASGP) is compared to an isotope plethysmographic method (ABVS), in order to evaluate how an externally recorded volume change corresponds to blood displacement within the leg during exercise. The coefficient of correlation for RT (venous return time) was 0.67 (P less than 0.001) and for EV (expelled volume) it was 0.61 (P less than 0.001). The RT values were similar by the two methods both in healthy controls and in patients with Chronic Venous Insufficiency (CVI). The corresponding EV values showed the same pattern in controls and patients but the values differed substantially. By ASGP the value was approximately 2 ml per 100 ml tissue compared to 33 ml per 100 ml blood by the ABVS method. Both methods could clearly distinguish normal controls from patients with chronic deep venous insufficiency, but ABVS could only make this distinction when the ankle area of measurement was applied.

Systemic circulation and cerebral oxygenation during head-up tilt in spinal cord injured individuals

“…Since calf volume changes are considered to re¯ect changes in venous volume, 17 our plethysmography results point out that cu induced venous volume change in supine position is greater in AB than in SCI, which is possibly caused by a smaller vascular bed 17 or less compliant veins in SCI. More importantly, the similar increase in calf volume in AB both during headup tilt and a 40 mmHg cu in¯ation suggests a sympathetic nervous system-induced change in venous tone, which is accordingly not found in SCI.…”

“…16 Relative changes in calf volume during cu in¯ation and head-up tilt were expressed as percentages of those during supine rest, which method is supposed to re¯ect changes in venous volume. 17 Analysis Averaged values of circulatory variables during headup tilt and supine rest periods and the corresponding cerebral oxygenation changes were calculated from data gathered during the last 5 min of each period, Cerebral oxygenation during head-up tilt S Houtman et al provided a steady state existed. Dierences between head-up tilt and supine rest were calculated for each individual.…”

Air plethysmography characteristic of the pathological segmental hypervolemia of the calf in patients with CVD clinical classes (CEAP)

“…Несмотря на то что исследования по возможности использования ППГ в диагностике гемодинамических нарушений у пациентов с ХЗВ начали проводиться с начала 90-х гг., вопрос о возможности использования ППГ в объективизации симптоматики ХВН у пациентов с ХЗВ и варикозной болезнью в частности на протяжемногих лет оставался открытым [13,14]. Большинство работ было посвящено использованию данного неинвазивного метода обследования исключительно в диагностике тромботических поражений периферического венозного русла [15][16][17].…”

Restoration of sinus rhythm does not improve peripheral blood flow in hemodynamically stable patients with atrial fibrillation

“…This method is widely used in examining various pathological conditions including both the arterial and venous parts of the vascular system. Strain-gauge plethysmography has been applied in diagnosing deep venous thrombosis [10,11], chronic venous insufficiency [12,13], assessment of hemodynamic changes and effects of angioplasty, also in the assessment of the impact of certain medications on peripheral blood flow [14,15].…”