Effect of the thigh-cuffs on the carotid artery diameter jugular vein section and facial skin edema: HDT study
| Autor: | I.V. Alferova, S Herault, Galina Fomina, Philippe Arbeille, J Roumy, Stephane Diridillou |
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| Rok vydání: | 2001 |
| Předmět: |
Carotid arteries
Aerospace Engineering Thigh Plasma volume Skin thickness Head-Down Tilt Edema Jugular vein medicine Humans Head-down position Fluid Shifts Weightlessness Simulation Skin business.industry Hemodynamics Stroke Volume Anatomy Femoral Vein Constriction Facial skin Femoral Artery medicine.anatomical_structure Carotid Arteries Face cardiovascular system Vascular Resistance medicine.symptom Jugular Veins business Weightlessness Countermeasures Bed Rest |
| Zdroj: | Acta astronautica. 49(3-10) |
| ISSN: | 0094-5765 |
| Popis: | Objective: To evaluate the distal arterial, venous and skin changes in a group using thigh cuffs during daytime and in a control group. Method: Cardiac, arterial, venous parameters were measured by echography and Doppler. Skin thickness was measured by high frequency echography. Results & discussion: Head down position induced plasma volume reduction, increased cerebral resistance, reduced lower limb resistance. The jugular vein increased whereas the femoral and popliteal veins decreased. All these changes were already observed in previous HDT. Common carotid diameter decreased, Front head skin thickness increased and Tibial skin thickness decreased. Eight hours with thigh cuffs increased the cardiac and carotid sizes which is in agreement with the plasma volume increase. Conversely they reduced the cerebral vascular resistance, jugular section and front head edema which may explain the sensation of comfort reported by the subjects. At the lower limb level the thigh cuffs restored the skin thickness to pre-HDT level but enlarged markedly the femoral and popliteal veins. HR, BP, CO, TPR did not change. |
| Databáze: | OpenAIRE |
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