Ryuji Ohtani
University of Tokushima
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Featured researches published by Ryuji Ohtani.
Heart | 2008
Takefumi Takahashi; Yoshikazu Hiasa; Yoshikazu Ohara; Shinichiro Miyazaki; Keitaro Mahara; Riyo Ogura; Hitoshi Miyajima; Kenichiro Yuba; Naoki Suzuki; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani
Background: Acute hyperglycaemia has been associated with impaired microvascular function after acute myocardial infarction (AMI), whereas pre-infarction angina (PIA) occurring shortly before the onset of AMI has been shown to reduce microvascular injury after reperfusion. Objective: To examine whether acute hyperglycaemia prevents the protective effect of PIA on microvascular function after AMI. Methods: We studied 205 patients with a first anterior wall AMI who underwent primary angioplasty within 12 hours of onset. Coronary flow velocity parameters were assessed immediately after reperfusion using a Doppler guidewire. Severe microvascular injury was defined as the presence of systolic flow reversal and diastolic deceleration time <600 ms. Echocardiographic wall motion was analysed before revascularisation and 4 weeks later. Results: Acute hyperglycaemia, defined as a blood glucose level of ⩾198 mg/dl on admission, was found in 67 (33%) patients. In patients without acute hyperglycaemia, PIA was associated with a lower incidence of systolic flow reversal, a longer diastolic deceleration time and a higher coronary flow reserve. However, in patients with acute hyperglycaemia there was no significant difference in these same parameters between patients with and without PIA. In the presence of acute hyperglycaemia PIA did not improve the change in wall motion score. In a multivariate model, the absence of PIA was an independent determinant of severe microvascular injury in patients without acute hyperglycaemia (odds ratio 6.28, p = 0.001), but not in patients with acute hyperglycaemia. Conclusion: The protective effect of PIA on microvascular function was attenuated in patients with acute hyperglycaemia, resulting in unfavourable functional recovery.
Heart | 2005
Yoshikazu Ohara; Yoshikazu Hiasa; Takefumi Takahashi; K Yamaguchi; Riyo Ogura; T Ogata; Kenichiro Yuba; K Kusunoki; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani
Objective: To investigate the relation between thrombolysis in myocardial infarction (TIMI) frame count (TFC) and coronary blood flow velocity (CBFV) parameters reflecting the degree of microvascular injury in patients with acute myocardial infarction. Results: TFC and CBFV were measured after primary coronary angioplasty in 103 consecutive patients with their first anterior wall acute myocardial infarction. TFC correlated inversely with the averaged peak velocity (r = −0.43, p < 0.0001). However, TFC did not correlate significantly with diastolic deceleration time and with the averaged systolic peak velocity (r = −0.16, p = 0.22, and r = −0.23, p = 0.16, respectively). The patients were divided into two groups according to presence (35 patients) or absence (68 patients) of systolic flow reversal. There was no significant difference in TFC between the two groups (29 (16) v 25 (13), p = 0.20). Conclusions: These findings suggest that the TFC reflects epicardial CBFV. However, it is not accurate enough to assess the degree of microvascular injury after primary coronary angioplasty.
Journal of Cardiology | 2011
Takafumi Nakagawa; Yoshikazu Hiasa; Shinobu Hosokawa; Tomoko Minami; Yudai Yano; Kohei Yoneda; Michiko Mizobe; Naotsugu Murakami; Yohei Tobetto; Hirotoshi Chen; Shinichiro Miyazaki; Keitaro Mahara; Riyo Ogura; Hitoshi Miyajima; Kenichiro Yuba; Takefumi Takahashi; Koichi Kishi; Ryuji Ohtani
BACKGROUND The optimal duration of dual antiplatelet therapy (DAT) in patients undergoing intracoronary sirolimus-eluting stent implantation remains controversial. OBJECTIVE To evaluate the clinical effects of long duration DAT in patients undergoing intracoronary sirolimus-eluting stent implantation in daily practice. In addition, to attempt to identify the optimal duration of DAT after implantation of a sirolimus-eluting stent. METHODS We retrospectively report on 1293 consecutive patients who underwent successful intracoronary sirolimus-eluting stent implantation. We analyzed the cumulative incidence of stent thrombosis, non-fatal myocardial infarction (MI), death from cardiac causes, and the cumulative incidence of bleeding complications. RESULTS We compared the study end point in patients who received DAT for <6 months (n=1136) with that for patients who received DAT for >6 months (n=157). The median follow-up period was 1260 ± 462 days. Major bleeding occurred in 35 patients and intracranial hemorrhage in 8. In patients on DAT for >6 months, the incidence of any bleedings, major bleedings, and intracranial hemorrhage was significantly increased. On the other hand, there was no significant difference between the two groups in the risk of the primary end points (stent thrombosis, non-fatal MI, death from cardiac causes, death or MI). CONCLUSIONS Prolonged DAT for more than 6 months was not significantly more beneficial than aspirin monotherapy in reducing the risk of the occurrence of acute MI, stent thrombosis, and death, although it was associated with an increase in bleeding complications for low-risk patients.
Journal of Cardiology | 2010
Shinichiro Miyazaki; Yoshikazu Hiasa; Takefumi Takahashi; Yohei Tobetto; Hirotoshi Chen; Keitaro Mahara; Riyo Ogura; Hitoshi Miyajima; Kenichiro Yuba; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani
BACKGROUND Endothelial function predicts recurrence of adverse cardiac events in patients with acute coronary syndromes (ACS). Moreover, the recovery of endothelial function correlates with cardiac event-free survival. OBJECTIVES The aim of this study was to determine which clinical factors correlate with the improvement in endothelial function after ACS. METHODS Vascular endothelial function was assessed in 98 patients with ACS by flow-mediated dilation (FMD) of the brachial artery using high-resolution ultrasound at 2 weeks and 6 months after ACS. We measured several risk parameters including plasma markers of glucose homeostasis, lipids, and blood pressure at baseline and at 6 months after ACS. Body mass index (BMI) and waist circumference (WC) were also measured as anthropometric assessments. RESULTS At baseline, FMD was significantly correlated with BMI, WC, high-density lipoprotein cholesterol, the homeostasis model assessment of insulin resistance, and brachial artery diameter (r=-0.32, p=0.001; r=-0.44, p<0.0001; r=0.34, p=0.0006; r=-0.21, p=0.04; r=-0.47, p<0.0001, respectively). In a stepwise multivariate regression analysis at baseline, larger WC and brachial artery diameter were independently correlated with lower brachial artery FMD (R(2)=0.319, p<0.0001). At 6 months, the change in FMD was significantly correlated with the change in WC and BMI (r=-0.59, p<0.0001; r=-0.33, p=0.001, respectively). In a stepwise multivariate regression analysis, WC reduction was independently correlated with improved FMD (R(2)=0.349, p<0.0001). CONCLUSIONS WC reduction is more strongly correlated with the improvement of endothelial function after ACS than BMI reduction.
Clinical Cardiology | 2010
Shinobu Hosokawa; Yoshikazu Hiasa; Naotsugu Murakami; Yohei Tobbeto; Takafumi Nakagawa; Pomin Chen; Shinichiro Miyazaki; Riyo Ogura; Keitaro Mahara; Hitoshi Miyajima; Kenichiro Yuba; Takefumi Takahashi; Koichi Kishi; Ryuji Ohtani
Few studies have addressed gender differences in evoking preconditioning. In an experimental study, it was reported that the preconditioning effect disappeared after gonadectomy.
Japanese Circulation Journal-english Edition | 2003
Riyo Ogura; Yoshikazu Hiasa; Takefumi Takahashi; Koji Yamaguchi; Kensuke Fujiwara; Yoshikazu Ohara; Teru Nada; Tatsuro Ogata; Kanji Kusunoki; Kenichiro Yuba; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani
Circulation | 2003
Riyo Ogura; Yoshikazu Hiasa; Takefumi Takahashi; Koji Yamaguchi; Kensuke Fujiwara; Yoshikazu Ohara; Teru Nada; Tatsuro Ogata; Kanji Kusunoki; Kenichiro Yuba; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani
Circulation | 2005
Yoshikazu Ohara; Yoshikazu Hiasa; Shinobu Hosokawa; Takeshi Tomokane; Koji Yamaguchi; Riyo Ogura; Hitoshi Miyajima; Taturo Ogata; Kenichiro Yuba; Naoki Suzuki; Takefumi Takahashi; Koichi Kishi; Ryuji Ohtani
American Journal of Cardiology | 2007
Takefumi Takahashi; Yoshikazu Hiasa; Yoshikazu Ohara; Shinichiro Miyazaki; Riyo Ogura; Hitoshi Miyajima; Kenichiro Yuba; Naoki Suzuki; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani
Japanese Circulation Journal-english Edition | 2008
Takefumi Takahashi; Yoshikazu Hiasa; Yoshikazu Ohara; Shinichiro Miyazaki; Riyo Ogura; Naoki Suzuki; Shinobu Hosokawa; Koichi Kishi; Ryuji Ohtani