著者

小池 麻由 大津 史子 榊原 仁作 後藤 伸之

出版者

Japanese Society of Drug Informatics

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.14, no.4, pp.134-143, 2013-02-28 (Released:2013-03-06)

参考文献数

20

被引用文献数

12

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Objective: Recently, use of health foods and supplements, as well as the amount of information available about them, has been steadily increasing.  Therefore, a noticeable increase in adverse drug reactions caused by health foods and supplements has also been seen.  The purpose of this study was to clarify the current status and backgrounds of patients with health food- or supplement-related adverse health effects.Methods: We selected the cases of health food- or supplement-related adverse health effects from the Case Reports of Adverse Drug Reactions and Poisoning Information System (CARPIS) database, which contains over 57,000 case reports of adverse drug reactions.  We investigated the background, suspected products and adverse events in each case and conducted univariate logistic regression analysis to determine significance.Results: We obtained a total of 327 cases consisting of 103 causative products.  Women comprised 66% of study subjects and had a significant association with dietary supplements.  Patients with a history of liver disease had a significant association with liver damage caused by “Ukon,” a drink made from turmeric root and sold as an anti-hangover remedy in Japan.Conclusion: The causative products had several unique features.  This information should be utilized to prevent health food- and supplement-related adverse health effects in the future.

著者

豊田 紗和子 吉村 祐奈 矢野 玲子 青柳 裕 大津 史子 後藤 伸之

出版者

一般社団法人 日本医薬品情報学会

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.21, no.2, pp.70-78, 2019-08-31 (Released:2019-10-10)

参考文献数

31

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Objective: To clarify the background difference between drug-induced photosensitivity and ultraviolet-visible absorption spectrum or structure and to construct useful information for prevention and prediction of drug-induced photosensitivity. Methods: We investigated whether, for 457 drugs for which the ultraviolet-visible absorption spectrum is listed in the Japanese Pharmacopoeia, there were absorption maxima in the UVA (320 nm or more and less than 400 nm), UVB (280 nm or more and less than 320 nm), or UVA and UVB (280 nm or more and less than 400 nm). Structure was investigated for the existence of “conjugated”, carbonyl, sulfone, nitro and fluorine. The case drug group was taken to be those drugs for which photosensitivity was listed as a side effect on the medical drug package insert. Using statistical software, SPSS statistics ® 24 (IBM), we performed univariate logistic regression analysis, and multivariate logistic regression analysis with a stepwise increment method (likelihood ratio) combining items with p<0.2, and calculated the odds ratio (hereinafter: aOR). The significance level was taken as 0.05.Results: There were 85 drugs in the case drug group, and 372 drugs in the control drug group. As a result of multiple logistic regression analysis, in Model 1, we placed sulfone (aOR: 4.55, 95% C.I.: 2.22-9.35), fluorine (aOR: 3.66, 95% C.I.: 1.82-7.39) and nitro (aOR: 4.46, 95 % C.I.: 1.73-11.48) in this order. In Model 2, we placed sulfone (aOR: 4, 40, 95% C.I.: 2.12-9.15), fluorine (aOR: 3.81, 95% C.I.: 1.87-7.76), UVA (aOR: 2.40, 95% C.I.: 1.37-4.18) and nitro (aOR: 3.61, 95% C.I.: 1.39-9.40) in this order.Conclusion: When a drug is developed, its ultraviolet-visible absorption spectra and structure become clear, and from this information,measures can be taken which bear the potential risk of photosensitivity in mind.

著者

後藤 伸

出版者

神奈川大学経営学部

雑誌

国際経営論集 (ISSN:09157611)

巻号頁・発行日

no.3, pp.83-121, 1992-03-25

著者

丹羽 浩子 田辺 公一 矢野 玲子 後藤 伸之 大津 史子

出版者

一般社団法人 日本医薬品情報学会

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.20, no.3, pp.145-155, 2018-11-30 (Released:2018-12-08)

参考文献数

26

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Objective:In this study,we explored adverse reactions and patient background and performed a case/non-case study on a database of adverse reaction case reports in order aid the prevention of non-prescription drug abuse.Study Design:We conducted a case/non-case study on a database of adverse reaction case reports.Methods:We studied case reports of adverse reactions and addiction in Japan and extracted adverse reaction cases associated with taking antipyretic analgesics,antitussive drugs,antitussive expectorant drugs,hypnotic and sedative drugs,anti-anxiety drugs,and purgative drugs. We divided the extracted cases into an abuse case group (adverse reactions associated with non-prescription drug abuse,and divided its intended purpose or the purpose of abuse at the initial dose)and non-case group(other adverse reactions). We performed univariate logistic regression analysis on each item of investigation in the abuse case group and non-case group and calculated the odds ratio,p-value,and 95%confidence interval.Results:There were many abuse case reports of women 20-40 years old in the antipyretic analgesics abuse case group and many of them had liver/biliary lesions and chronic urological impairment. The most common reason reported for taking the initial dose of each drug was for its intended purpose.Discussion:It is important for pharmacists at community pharmacies and drugstores to be able to recognize the characteristics of patients who might be at risk of abuse and the adverse reactions and patient backgrounds elucidated in this study could be helpful in identifying them.

著者

酒井 隆全 和田 侑輝人 古閑 晃 田辺 公一 後藤 伸之 大津 史子

出版者

一般社団法人 日本医薬品情報学会

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.22, no.1, pp.7-16, 2020-05-29 (Released:2020-06-13)

参考文献数

16

被引用文献数

1

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Objective: The purpose of this study was to create a checklist that summarizes checkpoints that should be noted when using the Japanese Adverse Drug Event Report database (JADER). After we created the checklist, we then used it to survey published academic papers that used JADER.Method: First, we created a draft checklist for research that uses JADER by citing the report of CIOMS working group VIII “Practical Aspects of Signal Detection in Pharmacovigilance”. Then, we conducted a pilot test and revised the draft checklist. Finally, the checklist was completed after the review by a pharmacoepidemiology expert. The checklist was applied to published academic papers that used JADER, and the fulfill rate of each checkpoints was calculated.Results: A “checklist of important points to be noted during research that uses the data mining method in JADER (mainly signal detection by disproportionality analysis)” was created. We also revealed problems with published academic papers that used JADER. For example, some researchers were thought to be inappropriately using JADER as a source of their research while others used an inappropriate version of MedDRA.Conclusion: The checklist created in this study summarizes key points that could be noted in research that uses JADER and is thought to contribute to an improvement in quality of research that uses JADER. Additionally, in our investigation of published academic papers that used JADER, we found the possibility that both the role of signal detection and the impact on analysis of JADER using the updated MedDRA version are not well understood.

著者

掛谷 雅之 大津 史子 矢野 玲子 榊原 仁作 後藤 伸之

出版者

Japanese Society of Drug Informatics

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.16, no.2, pp.70-80, 2014 (Released:2014-09-06)

参考文献数

23

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Objective: The present study investigated risk factors and subjective symptoms associated with drug-induced thrombocytopenia.Methods: We selected 361 patients with drug-induced thrombocytopenia from the Case Reports of Adverse Drug Reactions and Poisoning Information System (CARPIS) database of over 65,000 case reports of adverse drug reactions and assigned these patients to a case group.  We also randomly selected 794 cases of adverse drug reactions not associated with thrombocytopenia as a control group.Results: Data were compared between the case and control groups, and results were analyzed using logistic regression analysis.  We identified type of infection (non-viral) and renal failure as risk factors for drug-induced thrombocytopenia.  In addition, administration of carbamazepine, methotrexate, interferon alpha, ticlopidine or valproic acid significantly increased the risk of drug-induced thrombocytopenia.  Significant associations were also found between drug-induced thrombocytopenia and purpura, fever, and mucosal bleeding.Conclusion: These findings provide helpful information for early detection and prevention of thrombocytopenia as a serious adverse drug reaction.

著者

飯久保 尚 青柳 吉博 浅田 和広 後藤 伸之 近澤 洋平 多田 公揚 柳瀬 秀明 若林 進

出版者

Japanese Society of Drug Informatics

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.19, no.4, pp.149-157, 2018 (Released:2018-03-21)

参考文献数

7

被引用文献数

1

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Objectives: Many pharmaceutical companies provide information on prescription drugs on their websites.  These websites are popular search tools for drug information for many reasons, including the availability of information at all times.  However, there are various sources of confusion for users, such as the website content differing between companies.  Therefore, to improve the usability of websites created by pharmaceutical companies, we investigated the expectations and perceptions of website users of current websites and presented our results to website users and developers.Design: A questionnaire survey.Methods: Website users were surveyed using a questionnaire developed based on data obtained from a preliminary survey of drug information pharmacists registered at the Japanese Society of Drug Informatics.  Then, using data from the user survey, we conducted a survey of website developers for pharmaceutical companies.Results: When asked what makes the websites of pharmaceutical companies excellent, 55.7% of users responded “a website filled with information.”  When asked how the website of pharmaceutical companies should be structured, the most common answer was “searchability and visibility” in responses in free-description format (25.3%) and was “inter-company consistency regarding types of drug information available as well as the process required for obtaining drug information” for responses in multiple-choice format (88.6%).  When asked whether users were unable to obtain drug information when needed because user registration was required, 87.3% of the users replied affirmatively, although 47.1% responded that some content should require user registration.  Of website developers, 46.9% collected and analyzed information about users’ website use.  They also hoped to identify the users’ needs.Discussion: The findings suggest that the usability of websites could be improved by providing opportunities for website users and developers to exchange opinions and by standardizing the content of pharmaceutical company websites, including what information should require user registration.

著者

永光 加奈 田辺 公一 後藤 伸之 大津 史子

出版者

一般社団法人日本医療薬学会

雑誌

医療薬学 (ISSN:1346342X)

巻号頁・発行日

vol.44, no.7, pp.370-379, 2018-07-10 (Released:2019-07-10)

参考文献数

7

被引用文献数

2

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We investigated the current situation of pharmacists' recognition of and countermeasures they take against adverse drug reactions (ADRs) in order to elucidate related factors. We administered a web-based questionnaire to pharmacists who work at community pharmacies. The factors included in the questionnaire were basic information, recognition of and countermeasures against ADRs (the frequency of ADR recognition, investigation medium, the recognition of and countermeasures against ADRs and reasons for those). There were 29 questions about ADR education in total. In this study, we focused on the frequency of ADR recognition and countermeasures taken against ADRs, and examined their current status and related factors. As a result, after performing multivariable logistic regression analysis, we found that the group of pharmacists who made prescription inquiries about patients had an association with the investigation medium they used and are likely to investigate actively. Our results suggest the possibility that many pharmacists differed in their knowledge about the onset and recognition of ADRs. Moreover, our results found situations where prescription inquiries were actively made, but ADRs were not adequately reported. In conclusion, pharmacists who make prescription inquiries are likely to investigate and actively use information media, and this suggests the necessity of selecting the appropriate information medium and critically examining information. However, since those who answered our survey were biased towards the young, it is necessary to consider the possibility that this influenced the results.

著者

杉木 竣介 田中 正二 山崎 俊明 後藤 伸介 東 利紀 黒田 一成

出版者

The Society of Physical Therapy Science

雑誌

理学療法科学 (ISSN:13411667)

巻号頁・発行日

vol.38, no.1, pp.50-55, 2023 (Released:2023-02-15)

参考文献数

18

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〔目的〕本研究は,人工膝関節全置換術(TKA)後の個別理学療法(個別療法)と個別集団併用型理学療法(併用型療法)を比較し,併用型療法の効果を明らかにすることを目的とした.〔対象と方法〕個別療法を行った者を個別療法群,併用型療法を行った者を併用型療法群とした.研究形式は後ろ向きコホート研究とした.〔結果〕膝関節屈曲可動域(ROM)は,術後3週と術後4週で個別療法群よりも併用型療法群で有意に大きかった.併用型療法群は,個別療法群よりも膝伸展筋力体重比が有意に高く,杖歩行獲得日数および在院日数が有意に短かった.〔結語〕TKA後の併用型療法は,個別療法よりも膝ROMや膝伸展筋力,杖歩行獲得日数や在院日数に正の効果を与える可能性が示唆された.

著者

五十嵐 敏明 今野 彩 塚本 仁 矢野 良一 渡辺 享平 中村 敏明 政田 幹夫 後藤 伸之

出版者

一般社団法人 日本医薬品情報学会

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.20, no.2, pp.66-71, 2018-08-31 (Released:2018-09-12)

参考文献数

10

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Objective: We have developed an automatic vigilance system (AVS) that automatically reports adverse drug reactions (ADR) based on laboratory finding abnormalities and symptom keywords in electronic medical records. In this study, we aimed to evaluate the impact of detecting ADR using AVS on medical treatment. Methods: In AVS, drugs and their ADR signals, which would be detected and reported by AVS to pharmacists, were defined. Pharmacists evaluated the severity of these signals to identify whether these signals should be discussed with the doctor, continued to be followed up, or ignored. We investigated detection of ADR at University of Fukui Hospital between April 2016 and March 2017 along with whether prescriptions were modified because of ADR and the contribution of AVS. Assuming that ADR had worsened without appropriate treatment, medical expenses needed for treating severe ADR were calculated. Results: In total, 325 signals were defined for 146 drugs. There were 9,103 ADR signals confirmed by pharmacists for 8,531 subjects. Of these, 12 and 164 signals were discussed with the doctor and continuously observed, respectively. The pharmacist's suggestions based on AVS led to prescription modifications in 10 cases, corresponding to a reduction of 2.56 million yen in medical expenses in the event that these cases become severe. Conclusion: AVS assisted prescription revisions because of ADR and is thought to contribute to the prevention of worsening of ADR and reduction of medical expenses.

著者

後藤 伸之 月岡 理絵 八田 壽夫 政田 幹夫 北澤 式文

出版者

日本臨床薬理学会

雑誌

臨床薬理 (ISSN:03881601)

巻号頁・発行日

vol.27, no.2, pp.465-468, 1996-06-30 (Released:2010-06-28)

参考文献数

9

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We performed a pharmacoepidemiological study on triazolam dependence with typical doses in out-patients of Fukui Medical School Hospital. We investigated the prescriptions (duration of treatment and total dose prescribed) for patients administered triazolam.The patients were classified according to the prescription pattern of this drug, Group 1: patients who had been prescribed triazolam daily, Group 2: those who had been allowed to take triazolam when they cannot sleep.Approximately 40% of all the patients had been prescribed triazolam for 8 months or longer, and were judged to be normal dose dependence. The prevalence of this dependence was apparently higher in group 1 than in group 2.

著者

後藤 伸之 白波瀬 正樹 八田 寿夫 政田 幹夫 李 鍾大 坪川 明義 清水 寛正 上田 孝典 中村 徹 北澤 式文

出版者

The Japanese Society of Clinical Pharmacology and Therapeutics

雑誌

臨床薬理 (ISSN:03881601)

巻号頁・発行日

vol.27, no.4, pp.725-730, 1996-12-31 (Released:2010-06-28)

参考文献数

7

被引用文献数

2 2

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We performed a pharmacoepidemiological study on the effect of different types of questionnaires on coughing and the prevalence of this symptom in out-patients taking angiotensin converting enzyme inhibitors (ACEI) in Fukui Medical School Hospital.The following three types of quentionnaires were prepared:Type 1 ; Questionnaire asking whether the patient has a cough or no after implying that ACEI might cause this symptom.Type 2 ; Questionnaire on the general adverse effects of ACEI, including coughing.Type 3 ; Questionnaire on the general adverse effects of ACEI other than coughing.All questionnaires included a blank space in which the patients were asked to write any adverse effects. The patients were randomly divided into three groups. Each group was given one of the three questionnaires. In the type 3 questionnaire, no patient com-plained of coughing. The prevalence of cough was higher in type 1 questionnaire than in type 2 quetionnaire patients. These results indicate that the prevalence of adverse effects varies greatly depending the type of questions in the questionnaire.

著者

後藤 伸之

出版者

公益社団法人 日本薬剤学会

雑誌

薬剤学 (ISSN:03727629)

巻号頁・発行日

vol.63, no.4, pp.197-200, 2003 (Released:2019-05-12)

参考文献数

11

著者

後藤 伸也

出版者

一般社団法人 表面技術協会

雑誌

表面技術 (ISSN:09151869)

巻号頁・発行日

vol.56, no.8, pp.447, 2005 (Released:2006-03-29)

参考文献数

6

被引用文献数

2

著者

鈴木 亮平 大津 史子 後藤 伸之

出版者

公益社団法人 日本薬学会

雑誌

YAKUGAKU ZASSHI (ISSN:00316903)

巻号頁・発行日

vol.135, no.7, pp.895-916, 2015 (Released:2015-07-01)

参考文献数

10

被引用文献数

1

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The purpose of this study was to develop and validate estimate equations for preventing adverse drug reactions (ADRs). We conducted five case-control studies to identify individual risk factors and subjective symptoms associated with the following five ADRs: drug-induced ischemic heart disease; renal damage; muscle disorder; interstitial pneumonia; and leucopenia. We performed logistic regression analysis and obtained eight regression equations for each ADR. We converted these to ADR estimate equations for predicting the likelihood of ADRs. We randomly selected 50 cases with non-individual ADRs from the Case Reports of Adverse Drug Reactions and Poisoning Information System (CARPIS) database of over 65000 case reports of ADRs, and assigned these cases to a validation case group. We then calculated the predictive probability for 50 cases using the eight estimate equations for each ADR. The highest probability for each ADR was set as the probability of each ADR. If the probability was over 50%, the case was interpreted as ADR-positive. We calculated and evaluated the sensitivity, specificity, and positive likelihood ratio of this system. Sensitivity of the estimate equations for muscle disorder and interstitial pneumonia were ≥90%. Specificity and positive likelihood ratios of estimate equations for renal damage, interstitial pneumonia and leucopenia were ≥80% and ≥5, respectively. Our estimate equations thus showed high validity, and are therefore helpful for the prevention or early detection of ADRs.

著者

森 千与 酒井 隆全 矢野 玲子 田辺 公一 後藤 伸之 大津 史子

出版者

一般社団法人日本医薬品情報学会

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.18, no.4, pp.261-269, 2017-02-28 (Released:2017-03-17)

参考文献数

24

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Purpose: The purpose of this study is to elucidate the characteristics of adverse events in pregnant women, the offending drugs, and patient backgrounds from reports of adverse events.  We performed a case series study.Methods: We used CARPIS, a database of adverse events and toxication reported in Japan spanning from 1987 to 2014 and created by the Drug Information Center, Meijo University.  We extracted cases of adverse events in pregnant women, their fetuses, and newborns and investigated the age, primary disease, and history of allergies of the women and the intended use of/offending drugs, therapeutic category, and names for adverse events.Result: We collected 434 cases of adverse events in pregnant women, and 251 pediatric cases with adverse events.  The most frequent offending drug in both groups was ritodrine hydrochloride.  The most frequent adverse event in pregnant women was pulmonary oedema due to the administration of ritodrine hydrochloride.  The most frequently reported adverse events in pediatric cases were transient hypothyroidism and withdrawal symptoms in newborns and birth abnormalities in fetuses and newborns, all of which were caused by drugs given for the underlying diseases of their mothers.Discussion: We elucidated serious adverse events in pregnant women caused by the administration of ritodrine hydrochloride.  Frequent factors for adverse events were the onset of physiological factors in pregnant women and complicated factors of the mechanism of action of ritodrine hydrochloride.  We need to monitor both mothers and fetuses during the drug administration.  It is suggested that adverse events in pediatric cases are associated with drugs given for underlying diseases in mothers.  Thus, it is necessary to give appropriate information and communicate the risks of taking these drugs before pregnancy.  We believe the results could be helpful in the early detection of adverse events in the future.

著者

松本 佳久 高山 義浩 後藤 伸 橋川 拓郎 長田 優衣 吉武 秀展 坂井 英生 中川 摂子 高橋 研二

出版者

日本国際保健医療学会

雑誌

国際保健医療 (ISSN:09176543)

巻号頁・発行日

vol.34, no.1, pp.13-18, 2019-03-20 (Released:2019-04-05)

参考文献数

18

被引用文献数

3

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目的  日本を訪れる外国人旅行者は、2018年度で3000万人超が予想されており、増加傾向にある。この訪日外国人旅行者の1.5%が訪日旅行中に怪我・病気になり、医療機関を受診する必要性を感じている。しかし、訪日外国人旅行者の27%が保険に未加入とされる。我々は、保険未加入の外国人旅行者が脳梗塞を発症し、経済的な問題が診療に影響を与えた事例を経験したので、報告を行う。症例  40代男性、東南アジアより、日本在住の親族を訪問中であった。突然の片麻痺を主体とする症状が発生し、病院受診となった。診察の結果、急性期脳梗塞と考えられ、対応を行った。その後、患者が保険未加入であること、親族も医療費支払は難しい状況であることが判明した。また、経済的な援助も見込めない状況であった。医療費を含めて診療内容について相談を行い、外来診療を継続して早期帰国を目指した。考察  保険未加入の外国人が日本滞在中に外傷や疾病に見舞われることがある。支払い能力の有無によらず適切な医療を提供すべきであるが、その結果として高額の医療費負担が生じ、患者本人や家族を困窮させることがないように配慮すべきである。利用できる制度がないか検索することや、医療費を含め診療内容について検討を行う必要がある。また、母国での医療につなげられるように長期的で継続的な診療をめざす必要がある。結論  保険未加入の外国人旅行者に脳梗塞に伴う症状が認められた。医療費や長期的な方向性を含め、相談を行いながら診療を行った。医療機関ごとの対応には限界があり、全国的な事例集積や具体的な対応方法についての相談先の整備が必要と考えられる。

著者

山本 大 矢野 良一 斎木 明子 田嶋 恭典 岩﨑 愛美 宇野 美雪 五十嵐 敏明 渡邉 享平 古俵 孝明 塚本 仁 後藤 伸之

出版者

一般社団法人 日本医薬品情報学会

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.24, no.3, pp.166-172, 2022-11-30 (Released:2023-01-06)

参考文献数

9

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Objective: Two types of symbols have been established as industry standards in terms of two-dimensional (2D) symbols with prescription information: one for objects to be printed on prescriptions and the other for electronic versions of medication diaries. However, no studies have investigated the system for using 2D symbols in pharmacies and hospitals/clinics as well as the quality of the information actually stored in these 2D symbols. Therefore, we conducted a survey to clarify the current status and problems pertaining to prescription information sharing via 2D symbols.Methods: We distributed questionnaires to community pharmacies through the Fukui Pharmaceutical Association and asked them to cooperate with us during the survey. The list of items in the survey included the installation status of devices necessary for reading 2D symbols at each pharmacy, receipt computer in use, and status of the support issued by hospitals/clinics for reading 2D symbols. At the same time, we received 2D symbols created by community pharmacies and conducted reading tests to examine issues related to the collection of prescription information via 2D symbols at medical institutions.Results: The response rate for the survey was 21.8%. Among the 57 stores that responded to the survey, 26 (45.6%) answered that they could read prescription symbols, and 22 of them had actually used the system till date. In addition, 38 community pharmacies were able to provide the 2D symbols for medication diaries. Of the 30 provided symbols for medication diaries, 16 (53.3%) could be read as Japanese data by the barcode reader used.Conclusions: It has become clear that the 2D symbols with stored prescription information are not being completely utilized at present, as both community pharmacies and hospitals/clinics face several issues such as hardware maintenance, software updates, and time and effort required for the usage.

著者

大津 史子 山田 安彦 岩澤 真紀子 後藤 伸之 武隈 洋 冨田 隆志

出版者

Japanese Society of Drug Informatics

雑誌

医薬品情報学 (ISSN:13451464)

巻号頁・発行日

vol.23, no.2, pp.N1-N9, 2021-08-31 (Released:2021-09-25)

著者

木村 純二 平 潔 後藤 伸治 泉水 裕二

出版者

公益社団法人 日本化学会

雑誌

日本化学会誌(化学と工業化学) (ISSN:03694577)

巻号頁・発行日

vol.1988, no.7, pp.1122-1123, 1988-07-10 (Released:2011-05-30)

参考文献数

12

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Conformational analyses of 2′, 3′-O-methylene- [1], 2′, 3′-O-isopropylidene- [2], 2′, 3′-O-isobutylmethylene- [3], 2′, 3′-O-diheptylmethylene- [4], and 2′, 3′-O-diphenylmethyleneuridine [5] are examined by interpretation of proton magnetic resonance coupling constants and quantitative application of the nuclear overhauser effect (NOE). Dihedral anglesφ 1′, 2′ and φ 3′, 4′ in DMSO-d6 at 22±1°C are slightly broadened in the order [1]>[2]>[3]≅[4]≅[5] because of the effect of steric barrier of alkylidene group. Under the same conditions, these compounds are found to exist primary in the syn-like conformation from NOE measurement. It is clarified that the population of the anti-conformation such as 2, 2′- and 2, 3′-anhydro nucleosides increases ([4]>[5]≅[3]>[2]>[1]) with the increase of bulkiness of the substituent of 2′, 3′-O-alkylidene group.