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Ahmed A, UlHaq MU, Mustansar Z, Shaukat A, Margetts L. How growing tumour impacts intracranial pressure and deformation mechanics of brain. ROYAL SOCIETY OPEN SCIENCE 2021; 8:210165. [PMID: 34631118 PMCID: PMC8479368 DOI: 10.1098/rsos.210165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 09/02/2021] [Indexed: 06/13/2023]
Abstract
Brain is an actuator for control and coordination. When a pathology arises in cranium, it may leave a degenerative, disfiguring and destabilizing impact on brain physiology. However, the leading consequences of the same may vary from case to case. Tumour, in this context, is a special type of pathology which deforms brain parenchyma permanently. From translational perspective, deformation mechanics and pressures, specifically the intracranial cerebral pressure (ICP) in a tumour-housed brain, have not been addressed holistically in literature. This is an important area to investigate in neuropathy prognosis. To address this, we aim to solve the pressure mystery in a tumour-based brain in this study and present a fairly workable methodology. Using image-based finite-element modelling, we reconstruct a tumour-based brain and probe resulting deformations and pressures (ICP). Tumour is grown by dilating the voxel region by 16 and 30 mm uniformly. Cumulatively three cases are studied including an existing stage of the tumour. Pressures of cerebrospinal fluid due to its flow inside the ventricle region are also provided to make the model anatomically realistic. Comparison of obtained results unequivocally shows that as the tumour region increases its area and size, deformation pattern changes extensively and spreads throughout the brain volume with a greater concentration in tumour vicinity. Second, we conclude that ICP pressures inside the cranium do increase substantially; however, they still remain under the normal values (15 mmHg). In the end, a correlation relationship of ICP mechanics and tumour is addressed. From a diagnostic purpose, this result also explains why generally a tumour in its initial stage does not show symptoms because the required ICP threshold has not been crossed. We finally conclude that even at low ICP values, substantial deformation progression inside the cranium is possible. This may result in plastic deformation, midline shift etc. in the brain.
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Affiliation(s)
- Ali Ahmed
- Department of Biomedical Engineering and Sciences, School of Mechanical and Manufacturing Engineering (SMME), National university of Sciences and Technology (NUST), Islamabad 44000, Pakistan
| | - Muhammad Uzair UlHaq
- Department of Biomedical Engineering and Sciences, School of Mechanical and Manufacturing Engineering (SMME), National university of Sciences and Technology (NUST), Islamabad 44000, Pakistan
| | - Zartasha Mustansar
- Department of Computational Engineering, Research Center of Modeling and Simulation (RCMS), National university of Sciences and Technology (NUST), Islamabad 44000, Pakistan
| | - Arslan Shaukat
- Department of Computer and Software Engineering, College of Electrical and Mechanical Engineering, National university of Sciences and Technology (NUST), Islamabad 44000, Pakistan
| | - Lee Margetts
- Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, UK
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Ejikeme T, de Castro GC, Ripple K, Chen Y, Giamberardino C, Bartuska A, Smilnak G, Marius C, Boua JV, Chongsathidkiet P, Hodges S, Pagadala P, Verbick LZ, McCabe AR, Lad SP. Evaluation of neurapheresis therapy in vitro: a novel approach for the treatment of leptomeningeal metastases. Neurooncol Adv 2020; 2:vdaa052. [PMID: 32642705 PMCID: PMC7236387 DOI: 10.1093/noajnl/vdaa052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Background Leptomeningeal metastases (LM), late-stage cancer when malignant cells migrate to the subarachnoid space (SAS), have an extremely poor prognosis. Current treatment regimens fall short in effectively reducing SAS tumor burden. Neurapheresis therapy is a novel approach employing filtration and enhanced circulation of the cerebrospinal fluid (CSF). Here, we examine the in vitro use of neurapheresis therapy as a novel, adjunctive treatment option for LM by filtering cells and augmenting the distribution of drugs that may have the potential to enhance the current clinical approach. Methods Clinically relevant concentrations of VX2 carcinoma cells were suspended in artificial CSF. The neurapheresis system’s ability to clear VX2 carcinoma cells was tested with and without the chemotherapeutic presence (methotrexate [MTX]). The VX2 cell concentration following each filtration cycle and the number of cycles required to reach the limit of detection were calculated. The ability of neurapheresis therapy to circulate, distribute, and maintain therapeutic levels of MTX was assessed using a cranial–spinal model of the SAS. The distribution of a 6 mg dose was monitored for 48 h. An MTX-specific ELISA measured drug concentration at ventricular, cervical, and lumbar sites in the model over time. Results In vitro filtration of VX2 cancer cells with neurapheresis therapy alone resulted in a 2.3-log reduction in cancer cell concentration in 7.5 h and a 2.4-log reduction in live-cancer cell concentration in 7.5 h when used with MTX. Cranial–spinal model experiments demonstrated the ability of neurapheresis therapy to enhance the circulation of MTX in CSF along the neuraxis. Conclusion Neurapheresis has the potential to act as an adjunct therapy for LM patients and significantly improve the standard of care.
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Affiliation(s)
- Tiffany Ejikeme
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - George C de Castro
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Katelyn Ripple
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Yutong Chen
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Charles Giamberardino
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Andrew Bartuska
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Gordon Smilnak
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Choiselle Marius
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Jane-Valeriane Boua
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | | | - Sarah Hodges
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Promila Pagadala
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | | | | | - Shivanand P Lad
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
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Böhm M, Faltermeier R, Brawanski A, Lang EW. Mathematical modeling of human brain physiological data. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:062711. [PMID: 24483490 DOI: 10.1103/physreve.88.062711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Indexed: 06/03/2023]
Abstract
Recently, a mathematical model of the basic physiological processes regulating the cerebral perfusion and oxygen supply was introduced [Jung et al., J. Math. Biol. 51, 491 (2005)]. Although this model correctly describes the interdependence of arterial blood pressure (ABP) and intracranial pressure (ICP), it fails badly when it comes to explaining certain abnormal correlations seen in about 80% of the recordings of ABP together with ICP and the partial oxygen pressure (TiPO(2)) of the neuronal tissue, taken at an intensive care unit during neuromonitoring of patients with a severe brain trauma. Such recordings occasionally show segments, where the mean arterial blood pressure is correlated with the partial oxygen pressure in tissue but anticorrelated with the intracranial pressure. The origin of such abnormal correlations has not been fully understood yet. Here, two extensions to the previous approach are proposed which can reproduce such abnormal correlations in simulations quantitatively. Furthermore, as the simulations are based on a mathematical model, additional insight into the physiological mechanisms from which such abnormal correlations originate can be gained.
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Affiliation(s)
- Matthias Böhm
- CIML Group, Department of Biophysics, University of Regensburg, 93040 Regensburg, Germany and Department of Neurosurgery, University Hospital Regensburg, 93042 Regensburg, Germany
| | - Rupert Faltermeier
- Department of Neurosurgery, University Hospital Regensburg, 93042 Regensburg, Germany
| | - Alexander Brawanski
- Department of Neurosurgery, University Hospital Regensburg, 93042 Regensburg, Germany
| | - Elmar W Lang
- CIML Group, Department of Biophysics, University of Regensburg, 93040 Regensburg, Germany
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Bardan G, Plouraboue F, Zagzoule M, Baledent O. Simple Patient-Based Transmantle Pressure and Shear Estimate From Cine Phase-Contrast MRI in Cerebral Aqueduct. IEEE Trans Biomed Eng 2012; 59:2874-83. [DOI: 10.1109/tbme.2012.2210716] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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