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Modeling Blood Flow in veins of Uniform Properties (Giraffe jugular vein)

Open Journal of Biophysics 2024年第2期14卷 132-153页

作者： Rogers Omboga Amenya Johanna Kibet Sigey Geoffrey Moriaso Ole Maloiy David Mwangi Theuri Department of Mathematics and Physical Sciences Dedan Kimathi University of Technology Nyeri Kenya Department of Pure and Applied Mathematics School of Mathematical Sciences Jomo Kenyatta Unversity of Agriculture and Technology Kisii Kenya Institute of Animal Physiology and Biotechnology Research University of Nairobi Nairobi Kenya

This paper models the giraffe’s jugular veins as a uniform collapsible tube from a rigid skull. The equations governing one-dimensional steady flow through such a tube for various conditions have been developed. The effects of inertial and inclination angles that have not been discussed previously have been included. It has been shown that different flows for a uniform tube (vein) are possible. However, this flow matches that of a jugular vein which is supercritical, and the steady solution has been given by the balance between the driving forces of gravity and the viscous resistance to the flow at the right atrium of the heart must be sub-critical for a fixed right-atrium pressure which means that an elastic jump is required to return the flow to sub-critical from the supercritical flow upstream this type of relationship gives rise to flow limitation at the same time given any right atrium fixed pressure there exists a maximum flow rate which when exceeded the boundary conditions of the flow do not hold boundary conditions at the right atrium are not satisfied hence making the steady flow impossible this mechanism of flow limitation is slightly different from the other one in that causes airways through forced expiration from the observation made it is clearly shown that there is an intravascular pressure difference with a change in height.

关键词： Blood Flow jugular vein Cross-Sectional Area Supercritical Subcritical Jump

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Malignant meningioma with jugular vein invasion and carotid artery extension:A case report and review of the literature

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World Journal of Clinical Cases 2020年第23期8卷 6110-6121页

作者： Hui-Ying Chen Feng Zhao Jiang-Yuan Qin Hai-Mei Lin Ji-Ping Su Department of Otolaryngology-Head and Neck Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Grade II and III meningiomas[World Health Organization(WHO)classification]rarely have extracranial metastases via the blood circulation;however,we experienced a case with a metaplastic atypical meningioma and local dedifferentiation that metastasized to the jugular vein,carotid artery and subclavian artery at the cervicothoracic *** cases have seldom been reported *** SUMMARY The patient was a 30-year-old man who developed right neck masses with dysphagia,labored breathing,dizziness,and occasional *** months earlier the patient was diagnosed with a right parietal lobe neoplasm and hemorrhage at a local hospital due to the sudden onset of headaches and left limb weakness,and the post-operative pathology was a metaplastic atypical meningioma(WHO grade II)with local de-differentiation(WHO III).Magnetic resonance imaging revealed a calcified mass at the root of the neck on the right and a large cystic mass in the right parapharyngeal *** and neck angiography showed that the right common carotid artery was compressed and completely occluded,and the jugular vein was enveloped by the tumor and occluded.A balloon occlusion test showed no perfusion in the right common carotid *** resection,carotid artery ligation,and subclavian artery reconstruction were *** tumor was a malignant ***,the patient had Horner's syndrome and *** This case highlights the importance of the link between a large cervical mass and a primary intracranial *** meningioma should not be considered merely as an intracranial metastasis spread through cerebrospinal fluid,it can also be transferred through the circulation to the parapharyngeal space and the cervical great vessels.

关键词： Malignant meningioma Metastasis Carotid artery jugular vein Resection and reconstruction Case report

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Effect of Head Position Angles on the Blood Flow in the jugular vein of Giraffes

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World Journal of Mechanics 2021年第8期11卷 165-175页

作者： Rogers Omboga Amenya Johanna Kibet Sigey Geoffrey Moriaso Ole Maloiy David Mwangi Theuri Department of Mathematics and Physical Sciences Dedan Kimathi University of Technology Nyeri Kenya Department of Pure and Applied Mathematics Jomo Kenyatta University of Agriculture and Technology Juja Kenya Department of Animal Physiology and Biotechnology University of Nairobi Nairobi Kenya

The study investigated the effect of the angular position of the head on the blood flow in the jugular vein of giraffes. The vein considered is elastic and collapsible such that its cross-sectional area is not uniform. Transmural pressure causes the blood to move along the vein. Mathematical equations describing the flow were developed, and the vein was considered to be inclined at an angle φ to the horizontal. A finite-difference scheme was used to solve the equations of motion for the flow. The results are presented via relevant tables and plots. Our findings show that a change in the position of the head causes variation in the external pressure, which in turn causes variation in the cross-sectional area of the vein. Moreover, a drop (or increase) in the inertial pressure of the blood may cause the vein to collapse (or distend), which again triggers a change in the pressure.

关键词： Venous Flow Hemodynamics Collapsible vein Blood Pressure jugular vein

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