Study: NCT06124664

Intervention type: DIAGNOSTIC_TEST
Intervention: Radionuclide venography
Description: With the patient in an upright position, 370 MBq of 99mTc pertechnetate is injected into one of the dorsal veins of the foot after applying a tourniquet in the area of the ankle joint. Then, with the help of a gamma camera detector, the movement of the radiopharmaceutical is monitored in the following segments: tibial (muscular-venous pump of the lower leg), popliteal, femoral and iliocaval. To study the evacuation function of the muscular-venous pump (MVP) of the leg, using an analytical computer program, areas of interest are identified in the tendon, muscle parts of the veins of the leg and the popliteal vein. The time of evacuation of the radiopharmaceutical from the MVP of the leg is estimated - the average transport time of the isotope.

Intervention type: DIAGNOSTIC_TEST
Intervention: Radionuclide venography
Description: With the patient in an upright position, 370 MBq of 99mTc pertechnetate is injected into one of the dorsal veins of the foot after applying a tourniquet in the area of the ankle joint. Then, with the help of a gamma camera detector, the movement of the radiopharmaceutical is monitored in the following segments: tibial (muscular-venous pump of the lower leg), popliteal, femoral and iliocaval. To study the evacuation function of the muscular-venous pump (MVP) of the leg, using an analytical computer program, areas of interest are identified in the tendon, muscle parts of the veins of the leg and the popliteal vein. The time of evacuation of the radiopharmaceutical from the MVP of the leg is estimated - the average transport time of the isotope.

Intervention type: DIAGNOSTIC_TEST
Intervention: Radionuclide venography
Description: With the patient in an upright position, 370 MBq of 99mTc pertechnetate is injected into one of the dorsal veins of the foot after applying a tourniquet in the area of the ankle joint. Then, with the help of a gamma camera detector, the movement of the radiopharmaceutical is monitored in the following segments: tibial (muscular-venous pump of the lower leg), popliteal, femoral and iliocaval. To study the evacuation function of the muscular-venous pump (MVP) of the leg, using an analytical computer program, areas of interest are identified in the tendon, muscle parts of the veins of the leg and the popliteal vein. The time of evacuation of the radiopharmaceutical from the MVP of the leg is estimated - the average transport time of the isotope.

Intervention type: DIAGNOSTIC_TEST
Intervention: single-photon emission computed tomography
Description: SPECT of the pelvic veins with in vivo-labelled red blood cells (RBCs). For radionuclide assessment of the state of the pelvic veins, 2 ml of Perfotech solution is injected into the cubital vein for subsequent labeling of red blood cells in vivo. In 20 minutes. 370 MBq of 99mTc-pertechnetate is injected into one of the veins of the dorsum of the foot and radionuclide venoscintigraphy is performed according to the method presented above. 20 minutes after the administration of the radiopharmaceutical and the venography, SPECT of the pelvic veins is performed. Tomography of the distribution of labeled erythrocytes in the pelvic veins is carried out in a circular orbit with the gamma camera detector rotated 360°. The analysis of the obtained information is carried out using the standard ECT Protocol software package, which allows obtaining sections in 3 projections (sagittal, transversal and coronal) with a slice step of 8 mm.

Intervention type: DIAGNOSTIC_TEST
Intervention: single-photon emission computed tomography
Description: SPECT of the pelvic veins with in vivo-labelled red blood cells (RBCs). For radionuclide assessment of the state of the pelvic veins, 2 ml of Perfotech solution is injected into the cubital vein for subsequent labeling of red blood cells in vivo. In 20 minutes. 370 MBq of 99mTc-pertechnetate is injected into one of the veins of the dorsum of the foot and radionuclide venoscintigraphy is performed according to the method presented above. 20 minutes after the administration of the radiopharmaceutical and the venography, SPECT of the pelvic veins is performed. Tomography of the distribution of labeled erythrocytes in the pelvic veins is carried out in a circular orbit with the gamma camera detector rotated 360°. The analysis of the obtained information is carried out using the standard ECT Protocol software package, which allows obtaining sections in 3 projections (sagittal, transversal and coronal) with a slice step of 8 mm.

Intervention type: DIAGNOSTIC_TEST
Intervention: single-photon emission computed tomography
Description: SPECT of the pelvic veins with in vivo-labelled red blood cells (RBCs). For radionuclide assessment of the state of the pelvic veins, 2 ml of Perfotech solution is injected into the cubital vein for subsequent labeling of red blood cells in vivo. In 20 minutes. 370 MBq of 99mTc-pertechnetate is injected into one of the veins of the dorsum of the foot and radionuclide venoscintigraphy is performed according to the method presented above. 20 minutes after the administration of the radiopharmaceutical and the venography, SPECT of the pelvic veins is performed. Tomography of the distribution of labeled erythrocytes in the pelvic veins is carried out in a circular orbit with the gamma camera detector rotated 360°. The analysis of the obtained information is carried out using the standard ECT Protocol software package, which allows obtaining sections in 3 projections (sagittal, transversal and coronal) with a slice step of 8 mm.