scholarly journals Comparative Analysis of Different Methods of Modeling the Thermal Effect of Circulating Blood Flow During RF Cardiac Ablation

2016 ◽  
Vol 63 (2) ◽  
pp. 250-259 ◽  
Author(s):  
A. Gonzalez-Suarez ◽  
E. Berjano
Keyword(s):  
Blood Flow ◽  
Comparative Analysis ◽  
Thermal Effect ◽  
Cardiac Ablation

scholarly journals Clinical Evaluation of Dental Metal Hazards and Therapeutic Effects of Shortwave Diathermy in Dental Medicine

2012 ◽  
Vol 2 (3) ◽  
pp. 88-95
Author(s):  
Chisato Mukai ◽  
Tetsuji Nakamoto ◽  
Yusuke Kondo ◽  
Chihiro Masaki ◽  
Atsumi Ohta ◽  
...  
Keyword(s):  
Blood Flow ◽  
Thermal Effect ◽  
Clinical Evaluation ◽  
The Body ◽  
Therapeutic Effects ◽  
Maxillofacial Region ◽  
Doppler Flowmetry ◽  
Whole Saliva ◽  
Dental Metal ◽  
Shortwave Diathermy

ABSTRACT Objective Shortwave diathermy causes increase in temperature from deep inside the body, results in upregulation of metabolism, and has analgesic effects. In this study, we explored the potential application of shortwave diathermy in the maxillofacial region by monitoring internal and external temperature changes, changes in blood flow, and resting saliva secretion under shortwave diathermy for subjects with and without dental metal restorations (MR) to confirm the safety and the limitation of shortwave diathermy for dental medicine. Materials and methods Twenty young healthy subjects were recruited (10 subjects with MR and 10 subjects without MR). Shortwave exposure was achieved with condenser-type probes placed on the bilateral mandibular angles, and the intraoral temperature was monitored. For functional analysis, unstimulated whole saliva before and after exposure was collected. The temperature and blood flow distributions of the exposed areas were then monitored by thermography and twodimensional (2D) laser Doppler flowmetry. Results Shortwave exposure for 20 minutes induced significant temperature increases in all groups (p ≤ 0.05). The subjects reported no discomfort. When subjects without MR held gold or titanium crowns in their mouths, the thermal effect by shortwave diathermy was reduced. Resting saliva upon exposure only increased significantly in metal-free subjects, and amylase concentration was also increased, but the level of the salivary stress biomarker chromogranin A was unchanged. Furthermore, thermography showed that shortwave diathermy significantly increased the surface temperature for cheek skin and the buccal mucosa; however, this increase failed to elevate surface blood flow. Conclusion Shortwave diathermy induces temperature increases in the maxillofacial region. MR did not cause excessive heating, on the contrary, reduce the thermal effect of shortwave radiation. The temperature rise maintains upregulation in salivary function, which could be utilized safely in dental medicine. How to cite this article Mukai C, Nakamoto T, Kondo Y, Masaki C, Ohta A, Hosokawa R. Clinical Evaluation of Dental Metal Hazards and Therapeutic Effects of Shortwave Diathermy in Dental Medicine. Int J Prosthodont Restor Dent 2012;2(3): 88-95.

A comparative analysis of cerebral asymmetry according to data from perfusion computed tomography in infarctions of the cerebral hemispheres and dyscirculatory encephalopathy

2015 ◽  
Vol 9 (4) ◽  
pp. 0-0
Author(s):  
Сеинова ◽  
L. Seinova
Keyword(s):  
Computed Tomography ◽  
Blood Flow ◽  
Comparative Analysis ◽  
Brain Ischemia ◽  
Hemispheric Asymmetry ◽  
Cerebral Hemispheres ◽  
Perfusion Computed Tomography ◽  
Dyscirculatory Encephalopathy ◽  
Chronic Brain Ischemia ◽  
The Brain

Currently a problem of timely diagnostics and treatment of disorders of cerebral circulation is one of the most important for medicine, as strokes and chronic brain ischemia occupy a significant place among the diseases leading to mortality and disability of population. Computed tomography is one of the leading diagnostics of cerebro-vascular disorders. Today, the diagnostic capabilities of perfusion computed tomography, especially in the field of subtle changes in perfusion in infected and in the contralateral hemispheres of the brain are poorly understood and aren’t used in full. The relevance and scientific novelty of this research is not in doubt. Based on the data of 87 patients with ischemic infarction of the cerebral hemispheres of the brain and vascular encephalopathy, a comparative analysis of blood flow in the affected and contralateral hemispheres, was carried out. The degree of asymmetry of blood flow depending on the phase of development of ischemic stroke and chronic brain ischemia was evaluated. The studies have shown that the relative indicator of inter-hemispheric asymmetry is reduced in the course of development of cerebral infarction, reaching minimum values of dyscirculatory encephalopathy. The author substantiates the practical use of the proposed indicator of inter-hemispheric asymmetry in the evaluation of the degree of chronic ischemic disturbances of cerebral blood flow.

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