The Experts below are selected from a list of 81 Experts worldwide ranked by ideXlab platform
Sanet H Kotze - One of the best experts on this subject based on the ideXlab platform.
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the posterior Intercostal vein a thermoregulatory gateway to the internal vertebral venous plexus
Clinical Anatomy, 2013Co-Authors: P V J M Hoogland, Quenton Wessels, W Vorster, Rob J M Groen, R Wettstein, L M Greyling, Sanet H KotzeAbstract:The internal vertebral venous plexus (IVVP) plays a putative role in thermoregulation of the spinal cord. Cold cutaneous venous blood may cool, while warm venous blood from muscles and brown fat areas may warm the spinal cord. The regulating mechanisms for both cooling and warming are still unknown. Warm venous blood mainly enters the IVVP via the intervertebral Veins. In the thoracic area these Veins are connected to the posterior Intercostal Veins. In this study, anatomical structures were investigated that might support the mechanisms by which warmed venous blood from the Intercostal muscles and the recently described paravertebral patches of brown adipose tissue are able to drain into the vertebral venous plexus. Therefore, tissue samples from human cadavers (n = 21) containing the posterior Intercostal vein and its connections to the IVVP and the azygos Veins were removed and processed for histology. Serial sections revealed that the proximal parts of the posterior Intercostal Veins contained abundant smooth muscle fibers at their opening into the azygos vein. Furthermore, the walls of the proximal parts of the posterior Intercostal Veins contain plicae that allow the vessel to dilate, thereby allowing it to serve as a pressure chamber. It is suggested that a cold induced closure of the Intercostal/azygos opening can result in retrograde blood flow from the proximal posterior Intercostal vein towards the IVVP. This blood flow would be composed of warm blood from the paravertebral brown adipose tissue and blood containing metabolic heat from the muscles draining into the Intercostal Veins.
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the posterior Intercostal vein a thermoregulatory gateway to the internal vertebral venous plexus
Clinical Anatomy, 2013Co-Authors: P V J M Hoogland, Quenton Wessels, W Vorster, Rob J M Groen, R Wettstein, L M Greyling, Sanet H KotzeAbstract:The internal vertebral venous plexus (IVVP) plays a putative role in thermoregulation of the spinal cord. Cold cutaneous venous blood may cool, while warm venous blood from muscles and brown fat areas may warm the spinal cord. The regulating mechanisms for both cooling and warming are still unknown. Warm venous blood mainly enters the IVVP via the intervertebral Veins. In the thoracic area these Veins are connected to the posterior Intercostal Veins. In this study, anatomical structures were investigated that might support the mechanisms by which warmed venous blood from the Intercostal muscles and the recently described paravertebral patches of brown adipose tissue are able to drain into the vertebral venous plexus. Therefore, tissue samples from human cadavers (n=21) containing the posterior Intercostal vein and its connections to the IVVP and the azygos Veins were removed and processed for histology. Serial sections revealed that the proximal parts of the posterior Intercostal Veins contained abundant smooth muscle fibers at their opening into the azygos vein. Furthermore, the walls of the proximal parts of the posterior Intercostal Veins contain plicae that allow the vessel to dilate, thereby allowing it to serve as a pressure chamber. It is suggested that a cold induced closure of the Intercostal/azygos opening can result in retrograde blood flow from the proximal posterior Intercostal vein towards the IVVP. This blood flow would be composed of warm blood from the paravertebral brown adipose tissue and blood containing metabolic heat from the muscles draining into the Intercostal Veins. Clin. Anat. 26:735-740, 2013. (c) 2013 Wiley Periodicals, Inc.
Noriyuki Kaku - One of the best experts on this subject based on the ideXlab platform.
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ultrasound guided double central venous access for azygos vein via the ninth and tenth Intercostal Veins
Journal of Vascular Access, 2021Co-Authors: Koichiro Yoshimaru, Toshiharu Matsuura, Yasuyuki Uchida, Keisuke Kajihara, Yukihiro Toriigahara, Yuki Kawano, Takuya Kondo, Yoshiaki Takahashi, Wakato Matsuoka, Noriyuki KakuAbstract:Some patients with intestinal failure, who are dependent on total parenteral nutrition for long periods, suffer from a lack of suitable conventional venous access points, including axillary, external jugular, internal jugular, subclavian, saphenous, and the brachio-cephalic and femoral Veins, due to their occlusion. Furthermore, extensive central venous stenosis and/or thrombosis of the superior and inferior vena cava may preclude further catheterization, so uncommon routes must be used, which can be challenging. In such patients, the azygos vein via the Intercostal vein is a viable candidate. Thoracotomy-assisted, thoracoscopy-assisted, and cut-down procedures are currently suggested such access. We found that ultrasound-guided percutaneous puncture method was a safe and minimally invasive approach and successfully placed two central venous lines in preparation for small bowel transplantation via two different Intercostal Veins (ninth and tenth). Although the lung was actually located just below the target Veins, an ultrasound provided augmented and clear vision, which contributed to the safe performance of the procedure without the need for invasive surgical intervention, such as thoracotomy, thoracoscopy, or rib resection using the cut-down technique. Furthermore, constant positive-pressure ventilation during vein puncture under general anesthesia also helps avoid venous collapse. Despite carrying a slight risk of light injury to the lung, artery, and nerve along with the vein compared to other procedures, we believe that ultrasound-guided puncture under general anesthesia is feasible as a minimally invasive method.
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ultrasound guided double central venous access for azygos vein via the ninth and tenth Intercostal Veins
Journal of Vascular Access, 2020Co-Authors: Koichiro Yoshimaru, Toshiharu Matsuura, Yasuyuki Uchida, Keisuke Kajihara, Yukihiro Toriigahara, Yuki Kawano, Takuya Kondo, Yoshiaki Takahashi, Wakato Matsuoka, Noriyuki KakuAbstract:Some patients with intestinal failure, who are dependent on total parenteral nutrition for long periods, suffer from a lack of suitable conventional venous access points, including axillary, extern...
P V J M Hoogland - One of the best experts on this subject based on the ideXlab platform.
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the posterior Intercostal vein a thermoregulatory gateway to the internal vertebral venous plexus
Clinical Anatomy, 2013Co-Authors: P V J M Hoogland, Quenton Wessels, W Vorster, Rob J M Groen, R Wettstein, L M Greyling, Sanet H KotzeAbstract:The internal vertebral venous plexus (IVVP) plays a putative role in thermoregulation of the spinal cord. Cold cutaneous venous blood may cool, while warm venous blood from muscles and brown fat areas may warm the spinal cord. The regulating mechanisms for both cooling and warming are still unknown. Warm venous blood mainly enters the IVVP via the intervertebral Veins. In the thoracic area these Veins are connected to the posterior Intercostal Veins. In this study, anatomical structures were investigated that might support the mechanisms by which warmed venous blood from the Intercostal muscles and the recently described paravertebral patches of brown adipose tissue are able to drain into the vertebral venous plexus. Therefore, tissue samples from human cadavers (n = 21) containing the posterior Intercostal vein and its connections to the IVVP and the azygos Veins were removed and processed for histology. Serial sections revealed that the proximal parts of the posterior Intercostal Veins contained abundant smooth muscle fibers at their opening into the azygos vein. Furthermore, the walls of the proximal parts of the posterior Intercostal Veins contain plicae that allow the vessel to dilate, thereby allowing it to serve as a pressure chamber. It is suggested that a cold induced closure of the Intercostal/azygos opening can result in retrograde blood flow from the proximal posterior Intercostal vein towards the IVVP. This blood flow would be composed of warm blood from the paravertebral brown adipose tissue and blood containing metabolic heat from the muscles draining into the Intercostal Veins.
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the posterior Intercostal vein a thermoregulatory gateway to the internal vertebral venous plexus
Clinical Anatomy, 2013Co-Authors: P V J M Hoogland, Quenton Wessels, W Vorster, Rob J M Groen, R Wettstein, L M Greyling, Sanet H KotzeAbstract:The internal vertebral venous plexus (IVVP) plays a putative role in thermoregulation of the spinal cord. Cold cutaneous venous blood may cool, while warm venous blood from muscles and brown fat areas may warm the spinal cord. The regulating mechanisms for both cooling and warming are still unknown. Warm venous blood mainly enters the IVVP via the intervertebral Veins. In the thoracic area these Veins are connected to the posterior Intercostal Veins. In this study, anatomical structures were investigated that might support the mechanisms by which warmed venous blood from the Intercostal muscles and the recently described paravertebral patches of brown adipose tissue are able to drain into the vertebral venous plexus. Therefore, tissue samples from human cadavers (n=21) containing the posterior Intercostal vein and its connections to the IVVP and the azygos Veins were removed and processed for histology. Serial sections revealed that the proximal parts of the posterior Intercostal Veins contained abundant smooth muscle fibers at their opening into the azygos vein. Furthermore, the walls of the proximal parts of the posterior Intercostal Veins contain plicae that allow the vessel to dilate, thereby allowing it to serve as a pressure chamber. It is suggested that a cold induced closure of the Intercostal/azygos opening can result in retrograde blood flow from the proximal posterior Intercostal vein towards the IVVP. This blood flow would be composed of warm blood from the paravertebral brown adipose tissue and blood containing metabolic heat from the muscles draining into the Intercostal Veins. Clin. Anat. 26:735-740, 2013. (c) 2013 Wiley Periodicals, Inc.
Koichiro Yoshimaru - One of the best experts on this subject based on the ideXlab platform.
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ultrasound guided double central venous access for azygos vein via the ninth and tenth Intercostal Veins
Journal of Vascular Access, 2021Co-Authors: Koichiro Yoshimaru, Toshiharu Matsuura, Yasuyuki Uchida, Keisuke Kajihara, Yukihiro Toriigahara, Yuki Kawano, Takuya Kondo, Yoshiaki Takahashi, Wakato Matsuoka, Noriyuki KakuAbstract:Some patients with intestinal failure, who are dependent on total parenteral nutrition for long periods, suffer from a lack of suitable conventional venous access points, including axillary, external jugular, internal jugular, subclavian, saphenous, and the brachio-cephalic and femoral Veins, due to their occlusion. Furthermore, extensive central venous stenosis and/or thrombosis of the superior and inferior vena cava may preclude further catheterization, so uncommon routes must be used, which can be challenging. In such patients, the azygos vein via the Intercostal vein is a viable candidate. Thoracotomy-assisted, thoracoscopy-assisted, and cut-down procedures are currently suggested such access. We found that ultrasound-guided percutaneous puncture method was a safe and minimally invasive approach and successfully placed two central venous lines in preparation for small bowel transplantation via two different Intercostal Veins (ninth and tenth). Although the lung was actually located just below the target Veins, an ultrasound provided augmented and clear vision, which contributed to the safe performance of the procedure without the need for invasive surgical intervention, such as thoracotomy, thoracoscopy, or rib resection using the cut-down technique. Furthermore, constant positive-pressure ventilation during vein puncture under general anesthesia also helps avoid venous collapse. Despite carrying a slight risk of light injury to the lung, artery, and nerve along with the vein compared to other procedures, we believe that ultrasound-guided puncture under general anesthesia is feasible as a minimally invasive method.
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ultrasound guided double central venous access for azygos vein via the ninth and tenth Intercostal Veins
Journal of Vascular Access, 2020Co-Authors: Koichiro Yoshimaru, Toshiharu Matsuura, Yasuyuki Uchida, Keisuke Kajihara, Yukihiro Toriigahara, Yuki Kawano, Takuya Kondo, Yoshiaki Takahashi, Wakato Matsuoka, Noriyuki KakuAbstract:Some patients with intestinal failure, who are dependent on total parenteral nutrition for long periods, suffer from a lack of suitable conventional venous access points, including axillary, extern...
Adnan Okur - One of the best experts on this subject based on the ideXlab platform.
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the superior vena cava syndrome caused by malignant disease imaging with multi detector row ct
European Journal of Radiology, 2006Co-Authors: Suat Eren, Adem Karaman, Adnan OkurAbstract:Abstract Objective The superior vena cava (SVC) obstruction by malignant diseases is either by direct invasion and compression or by tumour thrombus of the SVC. Whatever is its cause, obstruction of the SVC causes elevated pressure in the Veins draining into the SVC and increased or reversed blood flow through collateral vessels. Severity of the syndrome depends on the collateral vascular system development. Therefore, imaging of the collateral Veins with variable location and connection is important in determining the extension and management of the disease. Our aims are to describe collateral vessels of the superior vena cava syndrome (SVCS) related with the malignant diseases and to assess the ability of multi-detector row CT with multiplanar and 3D volume rendering techniques in determining and describing collateral circulations. Materials and methods We present CT angiography findings of seven patients with small cell carcinoma of the lung ( n = 2), squamous cell carcinoma of the lung ( n = 3), Hodgkin disease of the thorax ( n = 1), and squamous cell carcinoma of the oesophagus ( n = 1). The patients received contrast-enhanced CT scans of the chest and abdomen on a multi-detector row CT during breath holding at suspended inspiration. Results CT images revealed the cause and level of the SVC obstruction in all patients with axial and multiplanar reconstructed images. The SVC showed total obstruction in five patients and partial obstruction in two patients. The most common experienced collateral vessels were azygos vein (6), Intercostal Veins (6), mediastinal Veins (6), paravertebral Veins (5), hemiazygos vein (5), thoracoepigastric vein (5), internal mammary vein (5), thoracoacromioclavicular venous plexus (5), and anterior chest wall Veins (5). While one case showed the portal-systemic shunt, V. cordis media and sinus coronarius with phrenic Veins were enlarged in two cases, and the left adrenal vein was enlarged in a patient. In one case, the azygos vein with reversed blood flow was drained into both inferior vena cava and hemiazygos vein with the left renal vein. Conclusion Multi-detector row CT with multiplanar and 3D imaging is an effective tool in evaluation of the SVCS and has a greater advantage than the other imaging techniques. 3D volume rendering is a useful technique in determining and describing collateral circulations in addition to the primary disease process.