Faculty Profiles - Obara Takafumi

Papers - Obara Takafumi

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私(僕)の臨床研究、興味ありませんか? 救急集中治療の現場で臨床医が取り組む「小児」のデータベース研究の可能性

小原隆史, 内藤宏道, 塚原紘平, 本郷貴識, 野島剛, 湯本哲也, 中尾篤典

日本集中治療医学会雑誌 31 ( Suppl.1 ) S485 - S485 2024.9

Evolution and Effects of Ad Hoc Multidisciplinary Team Meetings in the Emergency Intensive Care Unit: A Five-Year Analysis. Reviewed International journal

Tetsuya Yumoto, Takashi Hongo, Takafumi Obara, Kohei Ageta, Toshiyuki Aokage, Kohei Tsukahara, Atsunori Nakao, Hiromichi Naito

Journal of clinical medicine 13 ( 15 ) 2024.7

Language：English Publishing type：Research paper (scientific journal)

Background: Multidisciplinary team meetings (MDTMs) are crucial in the ICU. However, daily rounds may not address all sensitive issues due to time constraints and the complexity of cases. This study aimed to describe detailed information and characteristics of ad hoc MDTMs in the ICU. Methods: This single-center, retrospective study analyzed adult emergency ICU admissions at Okayama University Hospital from 1 January 2019 to 31 December 2023. During this period, weekly regular multidisciplinary team ICU rounds were introduced in June 2020, and regular weekday morning MDTMs began in April 2022. A multiple logistic regression analysis was applied to determine the impact of these changes on the frequency of ad hoc MDTMs, adjusting for variables including annual changes. Results: The study analyzed 2487 adult EICU patients, with a median age of 66, and 63.3% of them male. MDTMs were held for 168 patients (6.8%), typically those with severe conditions, including higher COVID-19 prevalence and APACHE II scores, and longer ICU stays. Despite a constant total number of MDTMs, the likelihood of conducting ad hoc MDTMs increased annually (adjusted OR 1.19; 95% CI, 1.04-1.35). Of the 329 MDTMs conducted for these patients, 59.0% addressed end-of-life care, involving an average of 11 participants, mainly nurses and emergency and critical-care physicians. Conclusions: Changes in ICU round and meeting structures might be associated with a higher frequency of conducting ad hoc MDTMs, highlighting their evolving role and importance in patient care management.

DOI： 10.3390/jcm13154324

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後頭部可逆性白質脳症を合併した肢端紅痛症の1例

武川真也, 鈴木健吾, 宇田和宏, 茂原研司, 荒川恭佑, 齋藤有希惠, 宮原宏幸, 長谷川高誠, 小原隆史, 塚原紘平, 八代将登, 津下充, 塚原宏一

日本小児科学会雑誌 128 ( 7 ) 1004 - 1005 2024.7

後頭部可逆性白質脳症を合併した肢端紅痛症の1例

武川真也, 鈴木健吾, 宇田和宏, 茂原研司, 荒川恭佑, 齋藤有希惠, 宮原宏幸, 長谷川高誠, 小原隆史, 塚原紘平, 八代将登, 津下充, 塚原宏一

日本小児科学会雑誌 128 ( 7 ) 1004 - 1005 2024.7

Impact of sex of bystanders who perform cardiopulmonary resuscitation on return of spontaneous circulation in out-of-hospital cardiac arrest patients: A retrospective, observational study. Reviewed International journal

Shunsuke Nakamura, Tsuyoshi Nojima, Takafumi Obara, Takashi Hongo, Tetsuya Yumoto, Takashi Yorifuji, Atsunori Nakao, Hiromichi Naito

Resuscitation plus 18 100659 - 100659 2024.6

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: The impact of the sex of bystanders who initiate cardiopulmonary resuscitation (CPR) on out-of-hospital cardiac arrest (OHCA) patients has not been fully elucidated. This study aims to investigate the association between the sex of bystanders who perform CPR and the clinical outcomes of OHCA patients in real-world clinical settings. METHODS: We conducted a retrospective, observational study using data from the Okayama City Fire Department in Japan. Patients were categorized based on bystanders' sex. Our primary outcomes were return of spontaneous circulation (ROSC). Our secondary outcome was 30-day survival and 30-day favorable neurological outcome, defined as Cerebral Performance Category score of 1 or 2. Multivariable logistic regression analysis was used to examine the association between these groups and outcomes. RESULTS: The study included 3,209 patients with a comparable distribution of male (1,540 patients: 48.0%) and female bystanders (1,669 patients: 52.0%) between the groups. Overall, 221 (6.9%) ROSC at hospital arrival, 226 (7.0%) patients had 30-day survival, and 121 (3.8%) patients had 30-day favorable neurological outcomes. Bystander sex (female as reference) did not contribute to ROSC at hospital arrival (adjusted OR [aOR] 1.11, 95% CI: 0.76-1.61), 30-day survival (aOR 1.23, 95% CI: 0.83-1.82), or 30-day favorable neurological outcomes (aOR 0.66, 95% CI: 0.34-1.27). Basic life support education experience was a bystander factor positively associated with ROSC. Patient factors positively associated with ROSC were initial shockable rhythm and witness of cardiac arrest. CONCLUSION: There were no differences in ROSC, 30-day survival, or 30-day neurological outcomes in OHCA patients based on bystander sex.

DOI： 10.1016/j.resplu.2024.100659

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Organ donation after extracorporeal cardiopulmonary resuscitation: a nationwide retrospective cohort study. Reviewed International journal

Tetsuya Yumoto, Kohei Tsukahara, Takafumi Obara, Takashi Hongo, Tsuyoshi Nojima, Hiromichi Naito, Atsunori Nakao

Critical care (London, England) 28 ( 1 ) 160 - 160 2024.5

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Limited data are available on organ donation practices and recipient outcomes, particularly when comparing donors who experienced cardiac arrest and received extracorporeal cardiopulmonary resuscitation (ECPR) followed by veno-arterial extracorporeal membrane oxygenation (ECMO) decannulation, versus those who experienced cardiac arrest without receiving ECPR. This study aims to explore organ donation practices and outcomes post-ECPR to enhance our understanding of the donation potential after cardiac arrest. METHODS: We conducted a nationwide retrospective cohort study using data from the Japan Organ Transplant Network database, covering all deceased organ donors between July 17, 2010, and August 31, 2022. We included donors who experienced at least one episode of cardiac arrest. During the study period, patients undergoing ECMO treatment were not eligible for a legal diagnosis of brain death. We compared the timeframes associated with each donor's management and the long-term graft outcomes of recipients between ECPR and non-ECPR groups. RESULTS: Among 370 brain death donors with an episode of cardiac arrest, 26 (7.0%) received ECPR and 344 (93.0%) did not; the majority were due to out-of-hospital cardiac arrests. The median duration of veno-arterial ECMO support after ECPR was 3 days. Patients in the ECPR group had significantly longer intervals from admission to organ procurement compared to those not receiving ECPR (13 vs. 9 days, P = 0.005). Lung graft survival rates were significantly lower in the ECPR group (log-rank test P = 0.009), with no significant differences in other organ graft survival rates. Of 160 circulatory death donors with an episode of cardiac arrest, 27 (16.9%) received ECPR and 133 (83.1%) did not. Time intervals from admission to organ procurement following circulatory death and graft survival showed no significant differences between ECPR and non-ECPR groups. The number of organs donated was similar between the ECPR and non-ECPR groups, regardless of brain or circulatory death. CONCLUSIONS: This nationwide study reveals that lung graft survival was lower in recipients from ECPR-treated donors, highlighting the need for targeted research and protocol adjustments in post-ECPR organ donation.

DOI： 10.1186/s13054-024-04949-5

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Changes in temporal muscle dimensions and their clinical impact in out-of-hospital cardiac arrest survivors Reviewed

Takashi Hongo, Hiromichi Naito, Keibun Liu, Yuya Murakami, Satoshi Nozaki, Hiroki Maeyama, Ayaka Matsuoka, Hisashi Dote, Kazumasa Inaba, Satoshi Miike, Shigeki Fujitani, Tomohiro Hiraoka, Takafumi Obara, Tsuyoshi Nojima, Atsunori Nakao, Tetsuya Yumoto

Resuscitation Plus 17 100527 - 100527 2024.3

法的脳死判定時にCPAPモードを用いた無呼吸テストを実施した小児2例

平岡知浩, 小原隆史, 塚原紘平, 難波宏太, 岡田真澄, 平山隆浩, 湯本哲也, 内藤宏道, 中尾篤典

日本小児科学会雑誌 128 ( 2 ) 361 - 361 2024.2

Successful Cardiac, Lung, and Kidney Transplantation from a Methanol-poisoned Donor. Reviewed

Takashi Hongo, Tetsuya Yumoto, Yoshinori Kosaki, Tomohiro Hiraoka, Kohei Tsukahara, Tsuyoshi Nojima, Takafumi Obara, Kohei Ageta, Yukie Yamasaki, Kaori Taniguchi, Masanobu Miura, Satoru Miyaishi, Hiromichi Naito, Atsunori Nakao

JMA journal 7 ( 1 ) 133 - 135 2024.1

Language：English

Massive methanol exposure can lead to severe and detrimental effects that can result in death or brain death. As organs from patients with brain death after methanol ingestion are less likely to be recovered, these patients have been considered marginal donors. We present a case of successful multiple organ transplantation (heart, lungs, and kidneys) from a methanol-poisoned patient. Our experience illustrates that donor death from methanol intoxication does not preclude organ transplantation.

DOI： 10.31662/jmaj.2023-0081

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Hydrogen in Transplantation: Potential Applications and Therapeutic Implications. Reviewed International journal

Takafumi Obara, Hiromichi Naito, Tsuyoshi Nojima, Takahiro Hirayama, Takashi Hongo, Kohei Ageta, Toshiyuki Aokage, Masaki Hisamura, Tetsuya Yumoto, Atsunori Nakao

Biomedicines 12 ( 1 ) 2024.1

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Hydrogen gas, renowned for its antioxidant properties, has emerged as a novel therapeutic agent with applications across various medical domains, positioning it as a potential adjunct therapy in transplantation. Beyond its antioxidative properties, hydrogen also exerts anti-inflammatory effects by modulating pro-inflammatory cytokines and signaling pathways. Furthermore, hydrogen's capacity to activate cytoprotective pathways bolsters cellular resilience against stressors. In recent decades, significant advancements have been made in the critical medical procedure of transplantation. However, persistent challenges such as ischemia-reperfusion injury (IRI) and graft rejection continue to hinder transplant success rates. This comprehensive review explores the potential applications and therapeutic implications of hydrogen in transplantation, shedding light on its role in mitigating IRI, improving graft survival, and modulating immune responses. Through a meticulous analysis encompassing both preclinical and clinical studies, we aim to provide valuable insights into the promising utility of hydrogen as a complementary therapy in transplantation.

DOI： 10.3390/biomedicines12010118

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Treatment patterns and clinician stress related to care of out-of-hospital cardiac arrest patients with a do not attempt resuscitation order. Reviewed International journal

Ryo Tanabe, Takashi Hongo, Takafumi Obara, Tsuyoshi Nojima, Atsunori Nakao, Jonathan Elmer, Hiromichi Naito, Tetsuya Yumoto

Resuscitation plus 16 100507 - 100507 2023.12

Language：English Publishing type：Research paper (scientific journal)

OBJECTIVE: This research investigated treatment patterns for out-of-hospital cardiac arrest patients with Do Not Attempt Resuscitation orders in Japanese emergency departments and the associated clinician stress. METHODS: A cross-sectional survey was conducted at 9 hospitals in Okayama, Japan, targeting emergency department nurses and physicians. The questionnaire inquired about the last treated out-of-hospital cardiac arrest patient with a Do Not Attempt Resuscitation. We assessed emotional stress on a 0-10 scale and moral distress on a 1-5 scale among clinicians. RESULTS: Of 208 participants, 107 (51%) had treated an out-of-hospital cardiac arrest patient with a Do Not Attempt Resuscitation order in the past 6 months. Of these, 65 (61%) clinicians used a "slow code" due to perceived futility in resuscitation (42/65 [65%]), unwillingness to terminate resuscitation upon arrival (38/65 [59%]), and absence of family at the time of patient's arrival (35/65 [54%]). Female clinicians had higher emotional stress (5 vs. 3; P = 0.007) and moral distress (3 vs. 2; P = 0.002) than males. Nurses faced more moral distress than physicians (3 vs. 2; P < 0.001). Adjusted logistic regression revealed that having performed a "slow code" (adjusted odds ratio, 5.09 [95% CI, 1.68-17.87]) and having greater ethical concerns about "slow code" (adjusted odds ratio, 0.35 [95% CI, 0.19-0.58]) were associated with high stress levels. CONCLUSIONS: The prevalent use of "slow code" for out-of-hospital cardiac arrest patients with Do Not Attempt Resuscitation orders underscores the challenges in managing these patients in clinical practice.

DOI： 10.1016/j.resplu.2023.100507

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EICUでのドナー管理と救急応需率との関係

湯本哲也, 本郷貴識, 小崎吉訓, 小原隆史, 上田浩平, 野島剛, 飯田淳義, 青景聡之, 塚原紘平, 内藤宏道, 中尾篤典

日本救急医学会雑誌 34 ( 12 ) 855 - 855 2023.12

バルプロ酸徐放剤とオランザピン過量内服により遅発性に高アンモニア血症を生じた1例

萩原万瀧, 野島剛, 本郷貴識, 小原隆史, 小崎吉訓, 湯本哲也, 塚原紘平, 内藤宏道, 中尾篤典

日本救急医学会雑誌 34 ( 12 ) 798 - 798 2023.12

アセトアミノフェン中毒に対する一酸化炭素放出物質(CORM-401)の新規治療法としての可能性

青景聡之, Meng Ying, 小原隆史, 湯本哲也, 平山隆浩, 内藤宏道, 中尾篤典

日本救急医学会雑誌 34 ( 12 ) 717 - 717 2023.12

Evaluation for Blood Concentration and Efficacy/Safety of Continuous Administration of Thiamylal in Children. Reviewed International journal

Kenshiro Hirata, Takafumi Obara, Tokunori Ikeda, Hiroshi Watanabe, Issei Fujita, Hirokazu Furusho, Takako Ishiguro, Sachiko Jingami, Toru Maruyama, Katsuki Hirai, Shigeyuki Miyamura

Therapeutic drug monitoring 46 ( 3 ) 397 - 403 2023.11

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Thiamylal exerts excellent sedative effects. However, it is not routinely used because of its serious adverse effects. This study aimed to clarify the target blood concentration range and infusion rate of thiamylal in children by measuring its blood concentration and evaluating its relationship with efficacy and adverse effects. METHODS: This study was approved by the Ethics Committee of Japanese Red Cross Kumamoto Hospital. The authors included 10 children aged between 1 and 7 years who had received continuous intravenous (IV) infusion of thiamylal for the management of refractory status epilepticus, excluding those who met the exclusion criteria. After a 2 mg/kg bolus injection of thiamylal, continuous IV infusion was initiated at a rate of 2-3 mg/kg/h. Thiamylal concentration in the blood was measured using high-performance liquid chromatography. The State Behavioral Scale and the frequency of bolus injections were used to evaluate efficacy. Blood pressure and heart rate were measured to evaluate adverse effects. Statistical analyses of the time to awakening and the factors affecting it were also conducted. RESULTS: The State Behavioral Scale score during thiamylal administration was -2 or lower in all cases, suggesting that the depth of sedation was sufficient. The frequency of bolus injections decreased in a blood concentration-dependent manner, suggesting that the frequency tended to decrease, especially at thiamylal blood concentrations of 20 mcg/mL or higher. An increase of the infusion rate to 3 mg/kg/h was recommended, because the blood concentration may not reach 20 mcg/mL at an infusion rate of 2 mg/kg/h. There was also a case in which a rapid increase in blood concentration accompanied by a decrease in blood pressure and heart rate was observed when the infusion rate was increased to 4 mg/kg/h. Furthermore, the time to awakening after the end of administration correlated with the highest blood concentration during administration; therefore, delayed awakening was noted when using a high dose of thiamylal. CONCLUSIONS: The target blood concentration of thiamylal in children should be 20-30 mcg/mL, and the infusion rate should be based on 3 mg/kg/h.

DOI： 10.1097/FTD.0000000000001153

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Radiation in an emergency situation: attempting to respect the patient's beliefs as reported by a minor. Reviewed International journal

Tetsuya Yumoto, Takashi Hongo, Yasuhiro Koide, Takafumi Obara, Kohei Tsukahara, Hiromichi Naito, Atsunori Nakao

BMC medical ethics 24 ( 1 ) 80 - 80 2023.10

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Each individual's unique health-related beliefs can greatly impact the patient-clinician relationship. When there is a conflict between the patient's preferences and recommended medical care, it can create a serious ethical dilemma, especially in an emergency setting, and dramatically alter this important relationship. CASE PRESENTATION: A 56-year-old man, who remained comatose after out-of-hospital cardiac arrest, was rushed to our hospital. The patient was scheduled for emergency coronary angiography when his adolescent daughter reported that she and her father held sincere beliefs against radiation exposure. We were concerned that she did not fully understand the potential consequences if her father did not receive the recommended treatment. A physician provided her with in depth information regarding the risks and benefits of the treatment. While we did not want to disregard her statement, we opted to save the patient's life due to concerns about the validity of her report. CONCLUSIONS: Variations in beliefs regarding medical care force clinicians to incorporate patient beliefs into medical practice. However, an emergency may require a completely different approach. When faced with a patient in a life-threatening condition and unconscious, we should take action to prioritize saving their life, unless we are highly certain about the validity of their advance directives.

DOI： 10.1186/s12910-023-00962-5

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Schmorl's Node Found with Acute Lower Back Pain. Reviewed

Kenji Aoshima, Takafumi Obara, Tsuyoshi Nojima, Atsunori Nakao

Internal medicine (Tokyo, Japan) 2023.7

アセトアミノフェン中毒におけるプロカルシトニンの有用性

野島剛, 本郷貴識, 小原隆史, 小崎吉訓, 飯田淳義, 湯本哲也, 青景聡之, 塚原紘平, 内藤宏道, 中尾篤典

中毒研究 36 ( 2 ) 207 - 207 2023.7

救急医療現場における個人的信念に基づく医療行為拒否への対応放射線被曝拒否事例から考える

小出恭大, 湯本哲也, 本郷貴識, 小崎吉訓, 野島剛, 上田浩平, 小原隆史, 飯田淳義, 山本浩継, 青景聡之, 塚原紘平, 内藤宏道, 中尾篤典

日本臨床救急医学会雑誌 26 ( 3 ) 358 - 358 2023.7

体温管理療法中の温度管理が筋萎縮にあたえる影響の検討

本郷貴識, 小原隆史, 湯本哲也, 内藤宏道, 中尾篤典

日本脳低温療法・体温管理学会誌 26 ( 1 ) 48 - 48 2023.6

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Papers - Obara Takafumi