A Comparative Study of Radiofrequency Ablation in Unipolar and Bipolar Fashion

In this study we compared the effects of radiofrequency (RF) energy applied to the swine endocardium in a unipolar fashion and in a bipolar one with two different interelectrode distances (5mm, 10mm). RF energy (500 kHz) delivered to the swine endocardium was divided into eight categories : 100J, 101-200 J, 201-300 J, 301-400 J, 401-500 J, 501-600 J, 601-1000 J, and>1000J. The results showed that when RF energy was applied in a bipolar fashion, the lesions involved the catheter/tissue interface and partly the interelectrode spacing, while in a unipolar fashion. They were found in the catheter/tissue interface only. At any energy level, there were no statistically significant differences in lesion depths among all the three fashions, and the lesion surface areas produced by the bipolar fashion (with 5 mm or 10 mm interelectrode spacing) were all greater than those by the unipolar fashion (P< 0. 05). When the delivered energy was under 500 joules, a greater lesion surface area was found in 5 mm bipolar fashion than in 10mm bipolar fashion (P<0. 05), while energy exceeded 500 joules, the differences in the lesion surface areas were no longer significant between these two bipolar fashions.

The Association between Cellular Phone Usage and Brain Neoplasms

Background: The association between cellular phones and brain tumors is a question that is frequently asked of the medical and scientific community. The prevalence of cell phone use and the significant morbidity and mortality of brain tumors contribute to this pairing. Cell phones are known to emit radio frequency energy in the form of both ionizing and non-ionizing radiation. Ionizing radiation is known to be within X-rays, which do have an association with cancer. Objective: To assess if the use of the cell phone has an association with brain tumors. Methods: The searches performed through PubMed were conducted to find studies that sought to provide evidence as to whether or not increased cell phone exposure contributed to the development of brain tumors. Also searched for was increased regional metabolism of the brain with the use of the cell phone switched in the on position. Studies were restricted to being published during or after the year 2000 and presented in the English language. Results: The studies largely support the conclusion that cell phone usage does not lead to the development of brain cancer. Studies employed different strategies, such as the prospective cohort and case-control studies to reach this conclusion. Both studies failed to show statistically significant evidence that cell phones were associated with brain tumors of the central nervous system. Conclusions: Questions raised by crossover studies demonstrating increased regional brain glucose metabolism continue to remain largely unanswered by current research and remain a starting point for future research. The prevalence of the issue strengthens its position among others as a matter that the medical community must continue to address to meet the needs of an increasingly exposed patient population. The overall hypothesis that cell phone usage does not lead to the development of brain tumors was supported.

Mobile Phone Use and Risk of Thyroid Gland Lesions Detected by Ultrasonography

In recent years, widespread use of mobile phones has led to a public debate about possible harmful effects on human health. A lot of researchers studied the possible effect of radiofrequency energy (RFE) emitted from cell phones on the human body. Up to our knowledge no one studied the effect of these waves on the thyroid gland by Ultrasonography (US). Our aim was to investigate the possible effects of EMR arising from cell phones on the thyroid gland using US. A prospective study was done on 180 participants, 110 females and 70 males, ranging in age from 15 to 65. A constructed questionnaire was distributed among them before performing US of the neck. Demographic data along with US findings were collected and statistically analyzed. A total of 46.7% of our participants had abnormal findings of the thyroid gland more in non smart phone users and more in females. The commonest abnormality was multinodular goiter (54%). Expanded researches are still needed to answer the question about the hazards of RFE on human health. All efforts should be made to encourage users of cellular phone to follow mobile device recommendations of manufacturers and avoid its possible hazards as possible.

Radiofrequency treatment on respiratory symptoms due to gastroesophageal reflux disease

Background Diagnosis and treatment for respiratory symptoms （RSs） of gastroesophageal reflux disease （GERD） is more difficult than that for common esophageal symptoms. The goal of this study was to evaluate the efficacy and safety of radiofrequency （RF） treatment on RSs of GERD in a preliminary 12-month follow-up observation.