Faculty Profiles - NAKAO Atsunori

Papers - NAKAO Atsunori

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佐々木史哉, 野島剛, 上田浩平, 湯本哲也, 内藤宏道, 中尾篤典

日本臨床救急医学会雑誌 27 ( 3 ) 350 - 350 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. 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. 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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Long-term, patient-centered, frailty-based outcomes of older critical illness survivors from the emergency department: a post hoc analysis of the LIFE Study. International journal

Takashi Hongo, Tetsuya Yumoto, Mototaka Inaba, Shunsuke Taito, Takashi Yorifuji, Atsunori Nakao, Hiromichi Naito

BMC geriatrics 24 ( 1 ) 257 - 257 2024.3

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

BACKGROUND: Evidence indicates frailty before intensive care unit (ICU) admission leads to poor outcomes. However, it is unclear whether quality of life (QOL) and activities of daily living (ADL) for survivors of critical illness admitted to the ICU via the emergency department remain consistent or deteriorate in the long-term compared to baseline. This study aimed to evaluate long-term QOL/ADL outcomes in these patients, categorized by the presence or absence of frailty according to Clinical Frailty Scale (CFS) score, as well as explore factors that influence these outcomes. METHODS: This was a post-hoc analysis of a prospective, multicenter, observational study conducted across Japan. It included survivors aged 65 years or older who were admitted to the ICU through the emergency department. Based on CFS scores, participants were categorized into either the not frail group or the frail group, using a threshold CFS score of < 4. Our primary outcome was patient-centered outcomes (QOL/ADL) measured by the five-level EuroQol five-dimensional questionnaire (EQ-5D-5L) and the Barthel Index six months post-ICU admission, comparing results from baseline. Secondary outcomes included exploration of factors associated with QOL/ADL six months post-ICU admission using multiple linear regression analyses. RESULTS: Of 514 candidates, 390 participants responded to the EQ-5D-5L questionnaire, while 237 responded to the Barthel Index. At six months post-admission, mean EQ-5D-5L values declined in both the not frail and frail groups (0.80 to 0.73, p = 0.003 and 0.58 to 0.50, p = 0.002, respectively); Barthel Index scores also declined in both groups (98 to 83, p < 0.001 and 79 to 61, p < 0.001, respectively). Multiple linear regression analysis revealed that baseline frailty (β coefficient, -0.15; 95% CI, - 0.23 to - 0.07; p < 0.001) and pre-admission EQ-5D-5L scores (β coefficient, 0.14; 95% CI, 0.02 to 0.26; p = 0.016) affected EQ-5D-5L scores at six months. Similarly, baseline frailty (β coefficient, -12.3; 95% CI, - 23.9 to - 0.80; p = 0.036) and Barthel Index scores (β coefficient, 0.54; 95% CI, 0.30 to 0.79; p < 0.001) influenced the Barthel Index score at six months. CONCLUSIONS: Regardless of frailty, older ICU survivors from the emergency department were more likely to experience reduced QOL and ADL six months after ICU admission compared to baseline.

DOI： 10.1186/s12877-024-04881-x

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

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

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.

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. 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

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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Association of initial lactate levels and red blood cell transfusion strategy with outcomes after severe trauma: a post hoc analysis of the RESTRIC trial. International journal

Yoshinori Kosaki, Takashi Hongo, Mineji Hayakawa, Daisuke Kudo, Shigeki Kushimoto, Takashi Tagami, Hiromichi Naito, Atsunori Nakao, Tetsuya Yumoto

World journal of emergency surgery : WJES 19 ( 1 ) 1 - 1 2024.1

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

BACKGROUND: The appropriateness of a restrictive transfusion strategy for those with active bleeding after traumatic injury remains uncertain. Given the association between tissue hypoxia and lactate levels, we hypothesized that the optimal transfusion strategy may differ based on lactate levels. This post hoc analysis of the RESTRIC trial sought to investigate the association between transfusion strategies and patient outcomes based on initial lactate levels. METHODS: We performed a post hoc analysis of the RESTRIC trial, a cluster-randomized, crossover, non-inferiority multicenter trials, comparing a restrictive and liberal red blood cell transfusion strategy for adult trauma patients at risk of major bleeding. This was conducted during the initial phase of trauma resuscitation; from emergency department arrival up to 7 days after hospital admission or intensive care unit (ICU) discharge. Patients were grouped by lactate levels at emergency department arrival: low (< 2.5 mmol/L), middle (≥ 2.5 and < 4.0 mmol/L), and high (≥ 4.0 mmol/L). We compared 28 days mortality and ICU-free and ventilator-free days using multiple linear regression among groups. RESULTS: Of the 422 RESTRIC trial participants, 396 were analyzed, with low (n = 131), middle (n = 113), and high (n = 152) lactate. Across all lactate groups, 28 days mortality was similar between strategies. However, in the low lactate group, the restrictive approach correlated with more ICU-free (β coefficient 3.16; 95% CI 0.45 to 5.86) and ventilator-free days (β coefficient 2.72; 95% CI 0.18 to 5.26) compared to the liberal strategy. These findings persisted even after excluding patients with severe traumatic brain injury. CONCLUSIONS: Our results suggest that restrictive transfusion strategy might not have a significant impact on 28-day survival rates, regardless of lactate levels. However, the liberal transfusion strategy may lead to shorter ICU- and ventilator-free days for patients with low initial blood lactate levels.

DOI： 10.1186/s13017-023-00530-7

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Reply to: Stomach inflation during cardiopulmonary resuscitation in out-of-hospital cardiac arrest patients: Where did the air go? International journal

Hiromichi Naito, Takashi Hongo, Tetsuya Yumoto, Hiroki Maeyama, Atsunori Nakao

Resuscitation 194 110099 - 110099 2024.1

Multidisciplinary approach to a 93-year-old survivor with crush syndrome: A 124-h rescue operation after the 2024 Noto Peninsula earthquake. International journal

Mototaka Inaba, Hiromichi Naito, Masaki Hisamura, Kaoru Harada, Atsunori Nakao

Acute medicine & surgery 11 ( 1 ) e967 2024

Characteristics and outcomes of subarachnoid hemorrhage from vertebral artery dissection: A comparative study with other non-traumatic etiologies. International journal

Shu Oshita, Tetsuya Yumoto, Shunta Jinno, Ippei Matsuo, Takashi Hongo, Hiromichi Naito, Masafumi Hiramatsu, Jun Haruma, Kenji Sugiu, Shota Tanaka, Atsunori Nakao

Acute medicine & surgery 11 ( 1 ) e70031 2024

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

AIM: Vertebral artery dissection (VAD) is a rare cause of non-traumatic subarachnoid hemorrhage (SAH) with significant clinical implications. This study compared the clinical characteristics and outcomes of SAH from intracranial VAD rupture to those from other etiologies, primarily aneurysmal rupture. METHODS: This single-center retrospective cohort study at Okayama University Hospital included patients with non-traumatic SAH diagnosed between 2019 and 2023. Patients were categorized into "VAD rupture" and "other etiologies" groups. The main outcome was clinical presentation and symptoms. Additional outcomes included ICU mortality, in-hospital mortality, and unfavorable outcomes at discharge and 6 months, defined as a modified Rankin Scale score of 3-6. RESULTS: A total of 66 patients were included, with 14 in the VAD rupture group and 52 in the other etiologies group. The VAD rupture group was younger (median age 49 vs. 64 years, p = 0.003) and had a higher incidence of out-of-hospital cardiac arrest (42.9% vs. 9.6%, p = 0.011). Preceding headache was more common in the VAD rupture group (78.6% vs. 11.5%, p < 0.001), with a median duration of 36 h before presentation. ICU and in-hospital mortality was higher in the VAD rupture group (both 50.0% vs. 19.3%, p = 0.019). No significant differences were found in unfavorable neurological outcomes at hospital discharge and 6 months. CONCLUSIONS: VAD-related SAH often presents with prodromal headaches, severe symptoms like out-of-hospital cardiac arrest, and higher ICU and in-hospital mortality than other SAH causes, though long-term outcomes are similar. Larger, prospective studies are needed to refine interventions.

DOI： 10.1002/ams2.70031

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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. 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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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