Faculty Profiles - KOTANI Yasuhiro

Papers - KOTANI Yasuhiro

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Clinical outcome of Fontan operation in the patients with impaired cardiac function

Yasuhiro Kotani, Shingo Kasahara, Yasuhiro Fujii, Ko Yoshizumi, Yu Oshima, Shin-Ichi Otsuki, Teiji Akagi, Shunji Sano

JOURNAL OF CARDIAC FAILURE 14 ( 7 ) S151 - S151 2008.9

Clinical implication of early ventricular volume reduction for hypoplastic left heart syndrome with significant tricuspid valve regurgitation

Yasuhiro Kotani, Teiji Akagi, Shingo Kasahara, Ko Yoshizumi, Yu Ohshima, Shunji Sano

INTERNATIONAL JOURNAL OF CARDIOLOGY 122 73 - 73 2007.12

Tolerance of the developing cyanotic heart to ischemia-reperfusion injury: Impact of hypoxia from birth

Yasuhiro Fujii, Kozo Ishino, Tomoko Tomii, Yasuhiro Kotani, Yoshinori Miyahara, Shingo Kasahara, Shunji Sano, Teiji Akag, Yuki Katanosaka, Satoru Mori

INTERNATIONAL JOURNAL OF CARDIOLOGY 122 47 - 47 2007.12

Right ventricular outflow tract reconstruction in patients with persistent truncus arteriosus: a 15-year experience in a single Japanese center.

Osami Honjo, Yasuhiro Kotani, Teiji Akagi, Satoru Osaki, Masaaki Kawada, Kozo Ishino, Shunji Sano

Circulation journal : official journal of the Japanese Circulation Society 71 ( 11 ) 1776 - 80 2007.11

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

BACKGROUND: The present study analyzes a 15-year experience of repairing persistent truncus arteriosus (PTA) with a consistent policy of right ventricular outflow tract (RVOT) reconstruction (ie, direct anastomosis). METHODS AND RESULTS: This retrospective study included 13 consecutive patients with PTA (8 type I PTA, 5 type II) who underwent primary repair from September 1992 to December 2006. Median age and body weight at surgery were 21 days and 2.9 kg, respectively. All but 1 patient underwent RVOT reconstruction by direct anastomosis with a monocusp patch. There were 2 operative deaths (12%). No patient had a pulmonary hypertensive crisis. The median duration of ventilation was 5 days. Another patient died from cardiogenic shock resulting from late cardiac tamponade 2 months after surgery. Four patients (40%) required balloon angioplasty and 5 (50%) required re-operation for branch pulmonary artery and/or conduit obstruction during the median follow-up period of 70 months (44-174 months). Freedom from all re-interventions and re-operation at 5 years was 50% (95% confidence limits, 19-81%) and 60% (95% confidence limits, 30-91%), respectively. CONCLUSIONS: Reasonable early and long-term results can be achieved with direct anastomosis. Further reduction of the re-intervention rate could be attained by refining the surgical techniques and catheter intervention strategies.

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Efficacy of a miniature centrifugal rotary pump (TinyPump) for transfusion-free cardiopulmonary bypass in neonatal piglets

Shinya Ugaki, Kozo Ishino, Satoru Osaki, Yasuhiro Kotani, Osami Honjo, Hideo Hoshi, Naoyuki Yokoyama, Katsuhiro Ohuchi, Setsuo Takatani, Shunji Sano

ASAIO JOURNAL 53 ( 6 ) 675 - 679 2007.11

Language：English Publishing type：Research paper (scientific journal) Publisher：LIPPINCOTT WILLIAMS & WILKINS

We have developed a miniaturized semiclosed cardiopulmonary bypass (CPB) circuit incorporating a centrifugal blood pump (TinyPump) with a volume of 5 ml. The current study was undertaken to evaluate the hemolytic performance of the TinyPump in comparison with the BioPump and to investigate the impact of different CPB circuit volumes on hemodilution, coagulation, and the inflammatory response. Twelve 1-week-old piglets (3.4 +/- 0.2 kg) were used. The circuit comprised a centrifugal pump, a membrane oxygenator, and a cardiotomy reservoir. Cardiopulmonary bypass was conducted with mild hypothermia at 150 ml/kg/min for 3 hours. Transfusion was not performed. Priming volume was 68 ml for the circuit with the TinyPump and 111 nil for the circuit with the BioPump. Although the TinyPump required higher speed, plasma free hemoglobin levels after CPB were not different between the groups. After CPB, the TinyPump group had a significantly higher hematocrit (27% +/- 3% vs. 23% +/- 3%) and lower platelet reduction rate, lower thrombin-antithrombin complex levels, and lower interleukin-6 levels. Better lung compliance with less water content was observed in the TinyPump group. The TinyPump maintained CPB with acceptable hemolysis and lower inflammatory responses. This miniaturized CPB circuit may make transfusion-free open heart surgery feasible in neonates and would help to prevent postoperative organ dysfunction.

DOI： 10.1097/MAT.0b013e3181590719

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Impact of miniaturization of cardiopulmonary bypass circuit on blood transfusion requirement in neonatal open-heart surgery

Yasuhiro Kotani, Osami Honjo, Mahito Nakakura, Shinya Ugaki, Takuya Kawabata, Yosuke Kuroko, Satoru Osaki, Ko Yoshizumi, Shingo Kasahara, Kozo Ishino, Shunji Sano

ASAIO JOURNAL 53 ( 6 ) 662 - 665 2007.11

Language：English Publishing type：Research paper (scientific journal) Publisher：LIPPINCOTT WILLIAMS & WILKINS

This study was undertaken to determine the impact of miniaturization of a cardiopulmonary bypass (CPB) circuit on blood transfusion and hemodynamics in neonatal open-heart surgery. Neonates (n = 102) undergoing open-heart surgery between 2002 and 2006 were included and divided into three groups: group 1 (n = 28), Dideco 902 oxygenator + 5/16 '' line; group 2 (n = 29), Dideco 901 oxygenator + 1/4 '' line; group3 (n = 45), Dideco 901 oxygenator + 3/16 '' arterial + 1/4 '' venous line. Amount of priming volume, blood and bicarbonate sodium use during CPB, and hemodynamics were compared. Priming volume in the groups 2 and 3 was significantly less compared with the group 1 (group 1, 575 37 ml; group 2, 328 +/- 12 ml, group 3, 326 +/- 5 ml, p < 0.05). Blood transfusion and bicarbonate sodium use during CPB in groups 2 and 3 were significantly less compared with group 1. Hemodynamics during CPB was comparable. There were no differences between groups 2 and 3 in any parameter. Miniaturization of the CPB circuit resulted in decrease in priming volume and subsequent reduction in blood and bicarbonate sodium use. Downsizing the lines had minimal impact on any of the parameters studied, and further efforts should be made to achieve neonatal open-heart surgery without blood transfusion.

DOI： 10.1097/MAT.0b013e318158ddf6

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Efficacy of MCI-186, a free-radical scavenger and antioxidant, for resuscitation of nonbeating donor hearts. Reviewed International journal

Yasuhiro Kotani, Kozo Ishino, Satoru Osaki, Osami Honjo, Takanori Suezawa, Kazushige Kanki, Chikao Yutani, Shunji Sano

The Journal of thoracic and cardiovascular surgery 133 ( 6 ) 1626 - 32 2007.6

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

OBJECTIVE: Oxygen-derived free radicals are responsible in part for reperfusion injury in globally ischemic myocardium. In this study, the efficacy for resuscitation of nonbeating donor hearts of MCI-186, a free-radical scavenger and antioxidant, was investigated in a pig transplantation model. METHODS: Cardiac arrest was induced by asphyxiation. After 30 minutes of global ischemia, the hearts were excised and immediately reperfused from the aortic root with normoxemic blood cardioplegia (PO2 100 mm Hg) for 20 minutes, followed by perfusion with hyperoxemic blood (PO2 300 mm Hg). MCI-186 (3 mg/kg) was administered into the aortic root for the first 30 minutes of reperfusion in the treated group (n = 6), and untreated hearts were used as a control group (n = 6). Transplantation was performed with the heart beating. RESULTS: Posttransplantation recovery of cardiac output, end-systolic pressure-volume ratio, and first derivative of pressure of the left ventricle in the treated group were significantly better than those in the control group. The coronary sinus-aortic root difference in malondialdehyde levels remained low throughout reperfusion in the treated group but abruptly increased after initiation of oxygenated blood perfusion in the control group. The MCI-186-treated hearts showed low degree of edema and well-preserved ultrastructure with normal-appearing organelles, whereas the untreated hearts had marked swelling of mitochondria and scant glycogen granules. CONCLUSION: MCI-186 exerts a cardioprotective action at least partly by inhibition of lipid peroxidation. Antioxidant therapy at the initial reperfusion is essential to successful resuscitation of nonbeating hearts by continuous myocardial perfusion.

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Feasibility of a tiny centrifugal blood pump (TinyPump) for pediatric extracorporeal circulatory support. International journal

Katsuhiro Ohuchi, Hideo Hoshi, Yasuhiko Iwasaki, Kazuhiko Ishihara, Masaharu Yoshikawa, Shinya Ugaki, Kozo Ishino, Satoru Osaki, Yasuhiro Kotani, Shunji Sano, Setsuo Takatani

Artificial organs 31 ( 5 ) 408 - 12 2007.5

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

In this study, the performances of the TinyPump (priming volume 5 mL) system including the pediatric cannulae (Stöckert Pediatric Arterial Cannulae 2.6, 3.0, and 4.0 mm, Stöckert Instruments GmbH, Munich, Germany; Polystan 20-Fr Venous Catheter, MAQUET GmbH, Rastatt, Germany) and an oxygenator (Terumo Capiox RX05 Baby-RX, Terumo Cardiovascular Systems Co., Tokyo, Japan) were studied in vitro followed with preliminary ex vivo studies in 20-kg piglets. In vitro results revealed that the TinyPump system met the requirements for pump speed, pump flow, and pressure drop as extracorporeal circulatory support during open heart surgery and extracorporeal membrane oxygenation (ECMO) in pediatric patients. In 2-h ex vivo studies using 20-kg piglets where the blood contacting surface of the TinyPump was coated with a biocompatible phospholipid polymer, the plasma-free hemoglobin levels remained less than 5.0 mg/dL and no thrombus formation was observed inside the pump. The TinyPump system including the oxygenator and connecting circuits resulted in an overall priming volume of 68 mL, the smallest ever reported. The TinyPump can be a safe option for pediatric circulatory support during open heart surgery and ECMO without requiring blood transfusion.

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Left ventricular retraining and anatomic correction in teenage patient with congenitally corrected transposition of the great arteries.

Osami Honjo, Masaaki Kawada, Teiji Akagi, Yasuhiro Kotani, Kozo Ishino, Shunji Sano

Circulation journal : official journal of the Japanese Circulation Society 71 ( 4 ) 613 - 6 2007.4

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

Left ventricular (LV) retraining followed by anatomical repair would be a superior alternative in patients with congenitally corrected transposition (ccTGA) having a deconditioned morphologically left ventricle (MLV); however, LV retraining in older children is a challenging task. A retraining process of the MLV in a teenage patient with ccTGA is reported here. Cardiac catheterization at 7 years of age revealed low pressure of the MLV (33/4 mm Hg) and a LV to right ventricular pressure ratio (LVp/RVp ratio) of 0.32. The first pulmonary artery banding (PAB) was performed at 10 years of age. Although the LVp/RVp ratio reached 0.68, there was no evidence of adequate LV hypertrophy. The second PAB was performed 2 years after the initial PAB, resulting in an increase in the LVp/RVp ratio to 0.93 and an adequate LV hypertrophy. The double switch procedure was successfully performed at 13 years of age. Although the ejection fraction of the MLV mildly decreased, the patient has been doing well during a follow-up period of 4 years. The MLV in the teenage patient with ccTGA was successfully trained using a retraining strategy and has sustained systemic circulation after anatomical repair.

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Discrepancy between intraoperative transesophageal echocardiography and postoperative transthoracic echocardiography in assessing congenital valve surgery. Reviewed International journal

Osami Honjo, Yasuhiro Kotani, Satoru Osaki, Yasufumi Fujita, Takanori Suezawa, Atsushi Tateishi, Kozo Ishino, Masaaki Kawada, Teiji Akagi, Shunji Sano

The Annals of thoracic surgery 82 ( 6 ) 2240 - 6 2006.12

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

BACKGROUND: The purpose of this study was to investigate the discrepancy between intraoperative transesophageal and postoperative transthoracic echocardiography in assessing residual regurgitation in children undergoing valve repair. METHODS: Forty-two consecutive children (median age, 5.1 years) who underwent valve repair for valvar regurgitation from 2001 to 2004 were retrospectively analyzed. The patients were divided into two groups: atrioventricular valve group (n = 33) and aortic valve group (n = 9). Regurgitation grade, fractional shortening, and atrioventricular inflow velocity obtained by intraoperative transesophageal echocardiography were compared with those obtained by transthoracic echocardiography at discharge (median, 11 days) and at follow-up (median, 8 months). RESULTS: Intraoperative transesophageal echocardiography revealed specific residual lesions in 4 patients, leading to successful re-repair. Fractional shortening obtained by intraoperative transesophageal echocardiography was lower than that obtained by predischarge transthoracic echocardiography (p < 0.01). In the atrioventricular valve group, the regurgitation grade obtained by intraoperative transesophageal echocardiography was lower than that obtained by predischarge transthoracic echocardiography (0.7 +/- 0.8 versus 1.4 +/- 0.9; p < 0.01), and agreement between the two examinations was found in 12 patients (38%). Peak atrioventricular inflow velocity obtained by intraoperative transesophageal echocardiography was lower than that obtained by predischarge transthoracic echocardiography (p < 0.01). In the aortic valve group, there was no significant difference between the regurgitation grades in the two examinations (0.8 +/- 0.8 versus 1.1 +/- 0.9), and complete agreement in regurgitation grade was found in 5 (56%) of 9 patients. CONCLUSIONS: There were considerable discrepancies between the examinations in evaluation of residual atrioventricular valve regurgitation and potential atrioventricular valve stenosis: most of the residual regurgitations were underestimated by intraoperative transesophageal echocardiography. In contrast, reasonable agreement was found between the two examinations in evaluation of aortic valve regurgitation.

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Advantages of temporary venoatrial shunt using centrifugal pump during bidirectional cavopulmonary shunt

Yasuhiro Kotani, Osami Honjo, Kozo Ishino, Satoru Osaki, Yosuke Kuroko, Takuya Kawabata, Shinya Ugaki, Ko Yoshizumi, Shingo Kasahara, Masaaki Kawada, Shunji Sano

ASAIO JOURNAL 52 ( 5 ) 549 - 551 2006.9

Language：English Publishing type：Research paper (scientific journal) Publisher：LIPPINCOTT WILLIAMS & WILKINS

Single-ventricle palliation without the use of cardiopulmonary bypass carries advantages that reduce systemic edema and inflammatory responses; however, simple clamping of the superior vena cava (SVC) without a temporary shunt leads to increase in cerebral venous pressure and subsequent decrease in cerebral blood flow during bidirectional cavopulmonary shunt (BCPS). We report our experience of BCPS, using a centrifugal pump-assisted temporary shunt.The criteria included an unrestrictive interatrial communication, the absence of atrioventricular valve regurgitation, and the existence of an antegrade pulmonary blood flow. From August 2000, 14 children with single-ventricle physiology met the criteria. The mean age was 1.0 +/- 0.9 years, and the mean weight was 8.4 +/- 2.6 kg. A temporary shunt was established between the SVC and the right atrium with right-angle cannulae, which were connected to a centrifugal pump to accelerate the blood flow from the SVC to the right atrium.All patients tolerated the procedure. Mean central venous pressure was 17 +/- 4 mm Hg, and transcutaneous oxygen saturation was maintained at 77 +/- 8% during anastomosis. No patients required blood transfusion. There were no postoperative neurological complications.The centrifugal pump-assisted temporary shunt offered safer and more effective circulatory support than other shunt systems, with excellent venous drainage in pediatric patients undergoing BCPS.

DOI： 10.1097/01.mat.0000235454.64316.f3

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Continuous cerebral and myocardial perfusion during aortic arch repair in neonates and infants

Yasuhiro Kotani, Kozo Ishino, Shingo Kasahara, Ko Yoshizumi, Osami Honjo, Masaaki Kawada, Shunji Sano

ASAIO JOURNAL 52 ( 5 ) 536 - 538 2006.9

Language：English Publishing type：Research paper (scientific journal) Publisher：LIPPINCOTT WILLIAMS & WILKINS

To minimize myocardial ischemia, we repaired aortic arch obstruction with ventricular septal defect, using two different techniques of cerebral and myocardial perfusion.Seventy-one infants, ages 3 to 137 days, underwent primary repair of coarctation of the aorta (n = 49)/interruption of the aortic arch (n = 22) with ventricular septal defect. In 65 patients, an end-to-end arch anastomosis was performed with cerebral and myocardial perfusion through the innominate or the ascending arterial cannula (non-working beating heart: NWBH). In the remaining 6 patients, an arterial cannula was placed into the innominate artery. With partial cardiopulmonary bypass, the innominate artery was snared proximal to the cannulation site and the ascending aorta was cross-clamped. An extended arch anastomosis was carried out with cerebral perfusion and a working beating heart (WBH).Ten patients (15%) undergoing aortic arch repair with the NWBH technique required cardioplegic arrest to complete a proximal anastomosis, whereas in all 6 repairs with the WBH technique, the extended anastomoses were completed without myocardial ischemia. One hospital death and late death occurred, with an overall survival of 98%.End-to-end arch reconstruction is feasible without myocardial ischemia, using the NWBH technique in patients without hypoplastic arch and using the WBH technique in patients with hypoplastic arch.

DOI： 10.1097/01.mat.0000235276.77489.bb

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Resuscitation of non-beating donor hearts using continuous myocardial perfusion: the importance of controlled initial reperfusion. International journal

Satoru Osaki, Kozo Ishino, Yasuhiro Kotani, Osami Honjo, Takanori Suezawa, Kazushige Kanki, Shunji Sano

The Annals of thoracic surgery 81 ( 6 ) 2167 - 71 2006.6

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

BACKGROUND: Warm ischemia is a major cause of cardiac allograft failure in transplants from non-heart-beating donors. To minimize myocardial ischemia, we used a continuous myocardial perfusion technique for resuscitation of donor hearts. The purpose of the present study was to investigate an optimal duration of controlled initial reperfusion. METHODS: Cardiac arrest was induced by asphyxia in 18 donor pigs. The hearts were harvested 30 minutes after global warm ischemia. Continuous myocardial reperfusion was immediately commenced from the aortic root with blood cardioplegic solution (20 degrees C, 40 mm Hg) and then with oxygenated blood (20 degrees to 37 degrees C, 40 to 60 mm Hg). Animals were divided into three groups according to the duration of the initial reperfusion: group I = 5 minutes, group II = 20 minutes, and group III = 60 minutes. Orthotopic transplantation was performed while keeping the heart beating by continuous myocardial perfusion. Cardiac function was evaluated before anoxia and after transplantation. Lactate extractions were determined during reperfusion. Myocardial edema was assessed by heart weight and posterior wall thickness of the left ventricle. RESULTS: Recovery rates of cardiac function in group II hearts after transplantation were better than in groups I and III (cardiac output, 61% +/- 9% versus 41% +/- 5% versus 44% +/- 4%, respectively; p < 0.05; left ventricular end-systolic pressure-volume ratio, 64% +/- 8% versus 36% +/- 9% versus 42% +/- 6%, respectively; p < 0.05). Lactate extractions in groups II and III returned to 0 within 20 minutes of reperfusion. Myocardial edema after transplantation in group II hearts was less than in groups I and III. CONCLUSIONS: The best recovery was observed in the non-beating donor hearts resuscitated by continuous myocardial perfusion when the initial controlled reperfusion with lukewarm blood cardioplegic solution at 40 mm Hg lasted for 20 minutes.

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Review of coronary artery disease in patients with infrarenal abdominal aortic aneurysm.

Yukio Kioka, Atsusi Tanabe, Yasuhiro Kotani, Nobuyuki Yamada, Makoto Nakahama, Toshiyuki Ueda, Tetsusi Seitou, Masahiko Maruyama

Circulation journal : official journal of the Japanese Circulation Society 66 ( 12 ) 1110 - 2 2002.12

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

In the process of establishing a less invasive assessment strategy for coronary artery disease (CAD) in patients with infrarenal abdominal aortic aneurysm (AAA), the incidence of CAD and the surgical and mid-term outcomes were reviewed. From January 1994 through September 2001, 94 elective surgical repairs of AAA were carried out. Preoperative coronary angiography showed 43 patients (45.7%) had CAD: 29 (67.4%) were asymptomatic, 23 had single-vessel disease (1VD), 12 had 2VD and 8 had 3VD. Of the 43 patients with CAD, 19 (44.2%) underwent coronary interventional therapy before aortic surgery (11 percutaneous transluminal coronary angioplasty (PTCA), 8 coronary artery bypass grafting). Eight asymptomatic patients underwent coronary interventional therapy. None of the patients died of cardiac causes or experienced a postoperative cardiac event. During the follow-up period, 10 late deaths occurred: 7 patients with CAD, and 3 cerebrovascular or cardiac deaths. There was no statistical difference in the survival rate between the groups with and without CAD. Two patients with CAD underwent PTCA during the follow-up period. The findings confirm the need for a less invasive assessment strategy of CAD that does not overlook asymptomatic myocardial ischemia, because the incidence of CAD in patients with AAA is high.

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Papers - KOTANI Yasuhiro