著者
Long Peng Zexiong Li Yanting Luo Xixiang Tang Xing Shui Xujing Xie Zhenda Zheng Ruimin Dong Jinlai Liu Jieming Zhu Suhua Li
出版者
The Japanese Circulation Society
雑誌
Circulation Journal (ISSN:13469843)
巻号頁・発行日
pp.CJ-20-0402, (Released:2020-09-03)
参考文献数
28
被引用文献数
4

Background:Atrial fibrillation (AF) recurrence remains a tricky problem in patients undergoing ablation. This meta-analysis aimed to summarize the current literature to clarify whether renin-angiotensin system inhibitors (RASIs) prevent AF recurrence after ablation.Methods and Results:Relevant studies were searched on Pubmed and EMBASE through December 2019. Pooled relative risk (RR) of AF recurrence was calculated. Subgroup analyses according to study design, race, and follow-up duration were further performed. A total of 15 studies examining 4,300 patients were included, with 3 randomized controlled trials and 12 cohort studies. Overall analysis showed that RASIs significantly reduced AF recurrence after ablation (RR=0.83; 95% confidence interval (CI) 0.70–0.98, P=0.028; I2=68.9%). Subgroup analysis further indicated that positive results were found in randomized controlled trials (RR=0.51, 95% CI 0.37–0.70, P<0.001; I2=4%), studies conducted in Asia (RR=0.59, 95% CI 0.46–0.76, P<0.001; I2=30.7%), and studies with follow-up duration ≥1 year (RR=0.82, 95% CI 0.70–0.95, P=0.01; I2=59.1%); negative results were found in cohort studies, studies conducted in Europe or the USA, and studies with follow-up duration <1 year.Conclusions:RASIs can potentially prevent AF recurrence after ablation under selected conditions. However, more studies are required to confirm this finding due to the variation in current evidence.
著者
服部 禎男
出版者
放射線防護医療研究会
雑誌
放射線防護医療 (ISSN:18814999)
巻号頁・発行日
no.9, pp.17-21, 2013-11
著者
渡部 昇一 服部 禎男
出版者
ワック
雑誌
歴史通
巻号頁・発行日
no.28, pp.32-44, 2014-01
著者
植田 公雄 藤村 亮 中野 才治 平島 浩 久保田 雄 服部 禎男 伊藤 力生 平塚 法夫
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.29, no.5, pp.428-435, 1987

A slab-type, large-scale fluidized bed reactor has been proposed as a means to obtain an adequate heat transfer area satisfying the limit of critical safe size, for use in the denitration reaction of highly enriched U. More specifically, with respect to the reactor, 120-mm wide, 1, 900-mm long, 4, 000-mm high, capable of 4% U enrichment, 3 t-U/d, examinations were conducted of its fundamental fluidization characteristics and the characteristics thus obtained showed that the reactor can be used with no ploblem and in a more stable manner than the conventional cylindrical reactor. The results are as follows:<BR>(1) It was found possible to approximate the reactor's fluidization initiation gas rate to the values obtainable by Babu's and Leva's formulas.<BR>(2) It was shown that the bed expansion can be approximated to 0.65 as calculated by Babu's formula.<BR>(3) Kato's formula can be applied, with some modifications, to the calculation of the bubble size in the fluidized bed.<BR>(4) An empirical formula was established for measuring the height of "jumping" particles, which is necessary in designing the reactor.<BR>(5) It was also found that the slab-type fluidized bed reactor operates with much less slugging and in a more stable manner than the cylindrical reactor.
著者
服部 禎男 青木 英人 新村 亮
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.11, no.9, pp.532-538, 1969

As nuclear power generation comes to occupy an ever larger portion of electric energy sources, it should become desirable or rather necessary for the nuclear power plants to have prompt load response characteristics to accommodate the necessary spinning reserve of the power system, even if these plants are to be operated in principle as what is known as "base load plants".<BR>The problem treated here is to find the possibility of realizing prompt load response in narrow range of BWR plants, and not wide range automatic power control.<BR>We have analyzed the load response characteristics of BWR plants by means of extraction flow variation. A decrease of the extraction flow was found to cause the plant power to increase through the following three processes:<BR>(1) Steam flow increase in the turbine<BR>(2) Reactivity increase occasioned by reactor pressure rise<BR>(3) Reactivity increase occasioned by reactor feed water temperature drop
著者
服部 禎男
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.8, no.12, pp.656-659, 1966

The Committee on Fission Products Release is composed of two study groups.<br>Group A deals with fission products behavior in the fuel and release thereof from the fuel.<br>Group B directs its activities toward quantitative evaluation of the physical and chemical behavior of fission products released into the single or mixed phases of water, steam and air in the nuclear power plant.<br>The article presents a brief description of some informative data from a selection of papers taken up and considered in group B.