[Multisegmental dynamic plethysmography for noninvasive study of venous function with special reference to exercise hyperemia].
Multilevel dynamic strain gauge plethysmography was evaluated in 22 healthy subjects. Venous volume changes were measured at the foot and calf level during tip-toeing exercise and at the thigh level during kneebends. These normal data were compared to those in 26 patients with chronic venous incompetence (CVI). Two types of curve resulted in the healthy subjects: if sensing site and exercised musculature do not correspond (foot sensing and calf-muscle exercise), venous volume decreases during exercise and stays on a constant level. However, if sensing site and exercised muscles are identical (calf--tip-toeings; thigh--kneebendings), venous volume increases again during exercise after a maximum volume decrease. This could be quantified by the volume increase angle beta. These mechanisms can be explained by exercise hyperemia. In patients suffering from CVI with only partially recanalized thrombotic occlusions, venous drainage is not sufficient and results in a significantly reduced (p less than 0.001) decrease in venous volume during exercise at the calf, or even in a volume increase. In the foot segment examined, however, no significant differences were found. Additional measurements at the thigh level are recommended for patients with a history of iliac vein thrombosis, especially for objective evaluation of intermittent venous claudication.
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D005082:Physical Exertion; D010991:Plethysmography / Q000379:methods*; D012016:Reference Values; D014648:Varicose Veins / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014680:Veins / Q000502:physiology; D014689:Venous Insufficiency / Q000000981:diagnostic imaging / Q000503:physiopathology*
Multisegmentale dynamische Plethysmographie zur nicht-invasiven Untersuchung der Venenfunktion unter besonderer Berücksichtigung der Arbeitshyperämie.