Kazuma Yamakawa

Dr. Kazuma Yamakawa

Department of Emergency Medicine, Osaka Medical College, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
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Research Focus & Metrics

Academic Career Length

18Years (2009-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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5 May 2018 in BMJ Open
Verified
Journal Article
Open access
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RFRyota Fuke
Ryota Fuke
THToru Hifumi
Toru Hifumi
YKYutaka Kondo
Yutaka Kondo
JHJunji Hatakeyama
Junji Hatakeyama
TTTetsuhiro Takei
Tetsuhiro Takei
ONOsamu Nishida
Osamu Nishida
Introduction We examined the effectiveness of early rehabilitation for the prevention of postintensive care syndrome (PICS), characterised by an impaired physical, cognitive or mental health status, among survivors of critical illness. Methods We performed a systematic literature search of several databases (Medline, Embase and Cochrane Central Register of Controlled Trials) and a manual search to identify randomised controlled trials (RCTs) comparing the effectiveness of early rehabilitation versus no early rehabilitation or standard care for the prevention of PICS. The primary outcomes were short-term physical-related, cognitive-related and mental health-related outcomes assessed during hospitalisation. The secondary outcomes were the standardised, long-term health-related quality of life scores (EuroQol 5 Dimension (EQ5D) and the Medical Outcomes Study 36-Item Short Form Health Survey Physical Function Scale (SF-36 PF)). We used the Grading of Recommendations Assessment, Development and Evaluation approach to rate the quality of evidence (QoE). Results Six RCTs selected from 5105 screened abstracts were included. Early rehabilitation significantly improved short-term physical-related outcomes, as indicated by an increased Medical Research Council scale score (standardised mean difference (SMD): 0.38, 95% CI 0.10 to 0.66, p=0.009) (QoE: low) and a decreased incidence of intensive care unit-acquired weakness (OR 0.42, 95% CI 0.22 to 0.82, p=0.01, QoE: low), compared with standard care or no early rehabilitation. However, the two groups did not differ in terms of cognitive-related delirium-free days (SMD: −0.02, 95% CI −0.23 to 0.20, QoE: low) and the mental health-related Hospital Anxiety and Depression Scale score (OR: 0.79, 95% CI 0.29 to 2.12, QoE: low). Early rehabilitation did not improve the long-term outcomes of PICS as characterised by EQ5D and SF-36 PF. Conclusions Early rehabilitation improved only short-term physical-related outcomes in patients with critical illness. Additional large RCTs are needed.

1 March 2016 in Journal of Thrombosis and Haemostasis
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Journal Article
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YUYutaka Umemura
Yutaka Umemura
Kazuma YamakawaKazuma Yamakawa
Kazuma Yamakawa
HOHiroshi Ogura
Hiroshi Ogura
HYHiroki Yuhara
Hiroki Yuhara
SFSatoshi Fujimi
Satoshi Fujimi

1 November 2021 in Critical Care
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Journal Article
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SMShuhei Murao
Shuhei Murao
HNHidekazu Nakata
Hidekazu Nakata
IRIan Roberts
Ian Roberts
Kazuma YamakawaKazuma Yamakawa
Kazuma Yamakawa
Background: Tranexamic acid (TXA) reduces surgical bleeding and reduces death from bleeding after trauma and childbirth. However, its effects on thrombotic events and seizures are less clear. We conducted a systematic review and meta-analysis to examine the safety of TXA in bleeding patients. Methods: For this systematic review and meta-analysis, we searched MEDLINE, EMBASE and the Cochrane Central Register of Controlled trials from inception until June 1, 2020. We included randomized trials comparing intravenous tranexamic acid and placebo or no intervention in bleeding patients. The primary outcomes were thrombotic events, venous thromboembolism, acute coronary syndrome, stroke and seizures. A meta-analysis was performed using a random effects model and meta-regression analysis was performed to evaluate how effects vary by dose. We assessed the certainty of evidence using the grading of recommendations, assessment, development and evaluations (GRADE) approach. Results: A total of 234 studies with 102,681 patients were included in the meta-analysis. In bleeding patients, there was no evidence that TXA increased the risk of thrombotic events (RR = 1.00 [95% CI 0.93–1.08]), seizures (1.18 [0.91–1.53]), venous thromboembolism (1.04 [0.92–1.17]), acute coronary syndrome (0.88 [0.78–1.00]) or stroke (1.12 [0.98–1.27]). In a dose-by-dose sensitivity analysis, seizures were increased in patients receiving more than 2 g/day of TXA (3.05 [1.01–9.20]). Meta-regression showed an increased risk of seizures with increased dose of TXA (p = 0.011). Conclusion: Tranexamic acid did not appear to increase the risk of thrombotic events in bleeding patients. However, because there may be dose-dependent increase in the risk of seizures, very high doses should be avoided.

10 January 2015 in Journal of Thrombosis and Haemostasis
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Journal Article
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Kazuma YamakawaKazuma Yamakawa
Kazuma Yamakawa
MAM. Aihara
M. Aihara
HOH. Ogura
H. Ogura
HYH. Yuhara
H. Yuhara
THToshimitsu Hamasaki
Toshimitsu Hamasaki
TST. Shimazu
T. Shimazu
Background Although recombinant human soluble thrombomodulin (rhTM) is a widely used novel anticoagulant agent for disseminated intravascular coagulation (DIC) in Japan, its clinical efficacy in sepsis‐induced DIC has not been demonstrated convincingly. Objective To assess the benefits and harms of rhTM in sepsis‐induced DIC patients. Methods We conducted a systematic review and meta‐analysis of rhTM therapy for sepsis‐induced DIC for both randomized controlled trials (RCTs) and observational studies (retrospective case‐control studies and/or prospective cohort studies) separately. All‐cause mortality (28–30 days) as efficacy and serious bleeding complications as adverse effect were measured as primary outcomes. We assessed body of evidence quality at the outcome level by using the Grading of Evidence, Assessment, Development and Evaluation (GRADE) approach. Results We analyzed 12 studies (838 patients/3 RCTs; 571 patients/9 observational studies). Pooled relative risk was 0.81 (95% CI, 0.62–1.06) in the RCTs, indicating non‐significant reduction in mortality, and 0.59 (95% CI, 0.45–0.77) in the observational studies. Meta‐regression analysis revealed a significant negative slope between effect size of rhTM therapy and baseline mortality rate in individual studies (P = 0.012), suggesting that probability of a beneficial effect with rhTM therapy increases with increasing baseline risk. Risk of serious bleeding complications was not significantly different between rhTM and control groups. We judged the quality of evidence as moderate for mortality and serious bleeding. Conclusions The rhTM was associated with a trend in reduction of mortality at 28–30 days in sepsis‐induced DIC patients. Further large rigorous trials are needed to confirm or refute these findings before implications for practice are clear.

1 February 2019 in Annals of Surgery
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Journal Article
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TKTakahiro Kinoshita
Takahiro Kinoshita
Kazuma YamakawaKazuma Yamakawa
Kazuma Yamakawa
HMHiroki Matsuda
Hiroki Matsuda
YYYoshiaki Yoshikawa
Yoshiaki Yoshikawa
DWDaiki Wada
Daiki Wada
SFSatoshi Fujimi
Satoshi Fujimi
Objective: The aim of this study was to evaluate the impact of a novel trauma workflow, using an interventional radiology (IVR)–computed tomography (CT) system in severe trauma. Background: In August 2011, we installed an IVR-CT system in our trauma resuscitation room. We named it the Hybrid emergency room (ER), as it enabled us to perform all examinations and treatments required for trauma in a single place. Methods: This retrospective historical control study conducted in Japan included consecutive severe (injury severity score ≥16) blunt trauma patients. Patients were divided into 2 groups: Conventional (from August 2007 to July 2011) or Hybrid ER (from August 2011 to July 2015). We set the primary endpoint as 28-day mortality. The secondary endpoints included cause of death and time course from arrival to start of CT and surgery. Multivariable logistic regression analysis adjusted for clinically important variables was performed to evaluate the clinical outcomes. Results: We included 696 patients: 360 in the Conventional group and 336 in the Hybrid ER group. The Hybrid ER group was significantly associated with decreased mortality [adjusted odds ratio (OR), 0.50 (95% confidence interval, 95% CI, 0.29–0.85); P = 0.011] and reduced deaths from exsanguination [0.17 (0.06–0.47); P = 0.001]. The time to CT initiation [Conventional 26 (21 to 32) minutes vs Hybrid ER 11 (8 to 16) minutes; P < 0.0001] and emergency procedure [68 (51 to 85) minutes vs 47 (37 to 57) minutes; P < 0.0001] were both shorter in the Hybrid ER group. Conclusion: This novel trauma workflow, comprising immediate CT diagnosis and rapid bleeding control without patient transfer, as realized in the Hybrid ER, may improve mortality in severe trauma.

1 June 2019 in Thrombosis Research
Verified
Journal Article
Closed access
SGSatoshi Gando
Satoshi Gando
ASAtsushi Shiraishi
Atsushi Shiraishi
Kazuma YamakawaKazuma Yamakawa
Kazuma Yamakawa
HOHiroshi Ogura
Hiroshi Ogura
DSDaizoh Saitoh
Daizoh Saitoh
YMYasuaki Mizushima
Yasuaki Mizushima