Effect of Ambient Temperature Changes on Blood Flow in Anterior Cerebral Artery of Patients with Skull Prosthesis

Taher, Mehran; Gholampour, Seifollah

doi:10.1016/j.wneu.2019.11.171

Cited by 13 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Equations governing the fluid were conservation of mass and conservation of momentum according to Eqs. (1) and 2, respectively [74][75][76][77][78] : www.nature.com/scientificreports/ where ρ, − → F , P, − → u , and v are the density, external force, pressure fields, periodic velocity, and kinematic viscosity of CSF, respectively.…”

Section: Methodsmentioning

confidence: 99%

Correlation of a new hydrodynamic index with other effective indexes in Chiari I malformation patients with different associations

Gholampour

2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

This study aimed to find a new CSF hydrodynamic index to assess Chiari type I malformation (CM-I) patients’ conditions and examine the relationship of this new index with morphometric and volumetric changes in these patients and their clinical symptoms. To this end, 58 CM-I patients in four groups and 20 healthy subjects underwent PC-MRI. Ten morphometric and three volumetric parameters were calculated. The CSF hydrodynamic parameters were also analyzed through computational fluid dynamic (CFD) simulation. The maximum CSF pressure was identified as a new hydrodynamic parameter to assess the CM-I patients’ conditions. This parameter was similar in patients with the same symptoms regardless of the group to which they belonged. The result showed a weak correlation between the maximum CSF pressure and the morphometric parameters in the patients. Among the volumetric parameters, PCF volume had the highest correlation with the maximum CSF pressure, which its value being higher in patients with CM-I/SM/scoliosis (R2 = 65.6%, P = 0.0022) than in the other patients. PCF volume was the more relevant volumetric parameter to assess the patients’ symptoms. The values of PCF volume were greater in patients that headache symptom was more obvious than other symptoms, as compared to the other patients.

show abstract

Section: Methodsmentioning

confidence: 99%

Correlation of a new hydrodynamic index with other effective indexes in Chiari I malformation patients with different associations

Gholampour

2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…As all the experiments in the present study were performed at a frequency of 50 Hz, the effects of frequency change both on increasing and reducing the growth rate of skin fibroblasts can be further studied. Furthermore, many simulation methods have been proposed to evaluate the biological conditions of cells, tissues, or organs, [39][40][41][42][43][44][45][46][47] and the results of present study could be developed using such simulation methods.…”

Section: Limitations and Future Workmentioning

confidence: 99%

The effect of electromagnetic field on decreasing and increasing of the growth and proliferation rate of dermal fibroblast cell

Naghibzadeh

Gholampour

Naghibzadeh

et al. 2020

Dermatologic Therapy

Self Cite

View full text Add to dashboard Cite

Maintaining the health of dermal fibroblast cells and controlling their growth and proliferation would directly affect the health of skin tissues. The present study encompassed three control and three experimental specimens, which were different in terms of the duration of exposure to electromagnetic field (EMF) and intensity. With a decrease in intensity from 2 to 1 mT during 24, 48, and 72 h after exposing the cells to EMF, the frequency of the sample fibroblast cells increased by 60.3%, 144.9%, and 90.1%, respectively. With an increase in intensity from 3 to 4 mT during 48 and 72 h of exposure to EMF, the frequencies of the sample fibroblast cells decreased by 6.8% and 86.7%, respectively. It seems to be possible to achieve the most desirable condition to help the restoration of wounds and skin lesions through decreasing the exposure intensity from 2 to 0.5 mT and increasing EMF exposure time from 24 to 72 h simultaneously and non‐invasively. The most desirable approach to improve the treatment of skin cancers non‐invasively is to increase the intensity from 3 to 5 mT and to enhance EMF exposure time from 48 to 72 h.

show abstract

“…Intracranial aneurysm (IA) is a risk for hemorrhagic stroke, and MCA has a high potential for developing an IA [ 68 ]. The relationship between changes in CBF and wall shear stress has been studied for the rupture risk using computer simulation [ 69 , 70 ]. Meanwhile, cerebral autoregulation has been shown to disrupt after aneurysmal subarachnoid hemorrhage [ 71 , 72 ].…”

Section: Discussionmentioning

confidence: 99%

Hemodynamics and Tissue Optical Properties in Bimodal Infarctions Induced by Middle Cerebral Artery Occlusion

Chen

Lin

et al. 2022

IJMS

View full text Add to dashboard Cite

Various infarct sizes induced by middle cerebral artery occlusion (MCAO) generate inconsistent outcomes for stroke preclinical study. Monitoring cerebral hemodynamics may help to verify the outcome of MCAO. The aim of this study was to investigate the changes in brain tissue optical properties by frequency-domain near-infrared spectroscopy (FD-NIRS), and establish the relationship between cerebral hemodynamics and infarct variation in MCAO model. The rats were undergone transient MCAO using intraluminal filament. The optical properties and hemodynamics were measured by placing the FD-NIRS probes on the scalp of the head before, during, and at various time-courses after MCAO. Bimodal infarction severities were observed after the same 90-min MCAO condition. Significant decreases in concentrations of oxygenated hemoglobin ([HbO]) and total hemoglobin ([HbT]), tissue oxygenation saturation (StO2), absorption coefficient (μa) at 830 nm, and reduced scattering coefficient (μs’) at both 690 and 830 nm were detected during the occlusion in the severe infarction but not the mild one. Of note, the significant increases in [HbO], [HbT], StO2, and μa at both 690 and 830 nm were found on day 3; and increases in μs’ at both 690 and 830 nm were found on day 2 and day 3 after MCAO, respectively. The interhemispheric correlation coefficient (IHCC) was computed from low-frequency hemodynamic oscillation of both hemispheres. Lower IHCCs standing for interhemispheric desynchronizations were found in both mild and severe infarction during occlusion, and only in severe infarction after reperfusion. Our finding supports that sequential FD-NIRS parameters may associated with the severity of the infarction in MCAO model, and the consequent pathologies such as vascular dysfunction and brain edema. Further study is required to validate the potential use of FD-NIRS as a monitor for MCAO verification.

show abstract

Effect of Ambient Temperature Changes on Blood Flow in Anterior Cerebral Artery of Patients with Skull Prosthesis

Cited by 13 publications

References 22 publications

Correlation of a new hydrodynamic index with other effective indexes in Chiari I malformation patients with different associations

Correlation of a new hydrodynamic index with other effective indexes in Chiari I malformation patients with different associations

The effect of electromagnetic field on decreasing and increasing of the growth and proliferation rate of dermal fibroblast cell

Hemodynamics and Tissue Optical Properties in Bimodal Infarctions Induced by Middle Cerebral Artery Occlusion

Contact Info

Product

Resources

About