著者

Takashi KUMAMOTO

出版者

The Association of Japanese Geographers

雑誌

Geographical review of Japan, Series B (ISSN:02896001)

巻号頁・発行日

vol.72, no.2, pp.135-161, 1999-12-01 (Released:2008-12-25)

参考文献数

62

被引用文献数

2 3

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To construct a seismic hazard map for intraplate earthquakes in Japan, historical records, paleoseismology data and a time-dependent conditional earthquake recurrence model were combined to create two types of contour maps: a probability map of peak ground acceleration (PGA) of 0.2 g or higher between 2001 AD and 2050 AD, and a PGA map of 10% probability during the same period. The resulting maps demonstrate the effectiveness of conditional seismic hazard analysis, although there are several uncertainties in the estimation of the slip rate, the elapsed time, and the segmentation of seismogenic fault systems. To create these maps, the historical seismicity rate for the last 400 years, and synthetic earthquake frequency from active fault data are first compared to examine the effect of uncertainties in fault segmentation and slip rate estimation. Then hazard maps based on time-dependent and time-independent models are derived. The results suggest that the conditional hazard map shows better agreement with current understanding of the recurrence behavior of active faults. For example, (1) low probabilities are obtained for faults that are considered to have ruptured within the historical period, and (2) higher probabilities are calculated for faults with long elapsed times or high slip rates. In addition, some seismogenic active fault systems are indicated as precautious faults based on the time-dependent earthquake recurrence model.

著者

Jun Yasuhara Toshiki Kuno Moe Taki Koichi Toda Takashi Kumamoto Takuro Kojima Hiroyuki Shimizu Shigeki Yoshiba Toshiki Kobayashi Naokata Sumitomo

出版者

International Heart Journal Association

雑誌

International Heart Journal (ISSN:13492365)

巻号頁・発行日

pp.19-099, (Released:2019-11-15)

参考文献数

25

被引用文献数

1

---

Postoperative arrhythmias are a frequent and fatal complication after the Fontan operation. However, clinical evidence demonstrating early postoperative arrhythmias in children undergoing the Fontan operation is limited. This study aimed to evaluate the prevalence of arrhythmias and identify the predictors of early postoperative supraventricular tachyarrhythmias (SVTs) after the Fontan procedure.Data were analyzed from 80 pediatric patients who underwent Fontan procedures between April 2000 and December 2017 in a single-center retrospective study. Early postoperative SVTs were defined as arrhythmias within 30 days after the Fontan procedure. We divided the patients into two groups, with or without early postoperative arrhythmias, and the predictors of early postoperative arrhythmias were analyzed. A multivariate logistic regression analysis was performed to determine independent predictors of early postoperative SVTs after the Fontan procedure.Early postoperative SVTs were observed in 21 patients (26.3%). The most common arrhythmia was junctional ectopic tachycardia. After an adjustment, an atrioventricular valve regurgitation (AVVR) grade of ≥2 (odds ratio 10.54, 95% confidence interval 2.52 to 44.17, P = 0.001) and preoperative arrhythmias (odds ratio 26.49, 95% confidence interval 1.64 to 428.62, P = 0.021) were significant predictors of early postoperative SVTs after the Fontan operation.An AVVR grade ≥2 and preoperative arrhythmia were significant predictors associated with early postoperative SVTs. Intervention for AVVR may provide clinical benefit for preventing early postoperative arrhythmias after the Fontan operation.

著者

Tokihiko MATSUDA Yasuhiro SUZUKI Takashi NAKATA Takashi KUMAMOTO Hiroshi UNE Kiyomine TERUMOTO Yoshiyuki MURAYAMA Takayuki NISHIYAMA Masaru YAMAGUCHI

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.77, no.12, pp.883-886, 2004-10-01 (Released:2008-12-25)

被引用文献数

1 1

著者

Jun Yasuhara Toshiki Kuno Moe Taki Koichi Toda Takashi Kumamoto Takuro Kojima Hiroyuki Shimizu Shigeki Yoshiba Toshiki Kobayashi Naokata Sumitomo

出版者

International Heart Journal Association

雑誌

International Heart Journal (ISSN:13492365)

巻号頁・発行日

vol.60, no.6, pp.1358-1365, 2019-11-30 (Released:2019-11-30)

参考文献数

25

被引用文献数

1

---

Postoperative arrhythmias are a frequent and fatal complication after the Fontan operation. However, clinical evidence demonstrating early postoperative arrhythmias in children undergoing the Fontan operation is limited. This study aimed to evaluate the prevalence of arrhythmias and identify the predictors of early postoperative supraventricular tachyarrhythmias (SVTs) after the Fontan procedure.Data were analyzed from 80 pediatric patients who underwent Fontan procedures between April 2000 and December 2017 in a single-center retrospective study. Early postoperative SVTs were defined as arrhythmias within 30 days after the Fontan procedure. We divided the patients into two groups, with or without early postoperative arrhythmias, and the predictors of early postoperative arrhythmias were analyzed. A multivariate logistic regression analysis was performed to determine independent predictors of early postoperative SVTs after the Fontan procedure.Early postoperative SVTs were observed in 21 patients (26.3%). The most common arrhythmia was junctional ectopic tachycardia. After an adjustment, an atrioventricular valve regurgitation (AVVR) grade of ≥2 (odds ratio 10.54, 95% confidence interval 2.52 to 44.17, P = 0.001) and preoperative arrhythmias (odds ratio 26.49, 95% confidence interval 1.64 to 428.62, P = 0.021) were significant predictors of early postoperative SVTs after the Fontan operation.An AVVR grade ≥2 and preoperative arrhythmia were significant predictors associated with early postoperative SVTs. Intervention for AVVR may provide clinical benefit for preventing early postoperative arrhythmias after the Fontan operation.