Takahiko Sakamoto

Tokyo Women's Medical University, Tokyo, Tokyo-to, Japan

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Publications (44)49.44 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The case of a 15-month-old boy with bilateral diaphragm paralysis after simultaneous cardiac surgery for tetralogy of Fallot, and Nuss procedure for pectus excavatum, is presented. Extubated one day after his first operation, the boy suffered severe respiratory distress soon after, due to bilateral diaphragmatic paralysis. Diaphragm paralysis restricted abdominal respiration, while thoracic respiration was inhibited by metallic bar after the Nuss Procedure, which combined prevented extubation for 47 days. Thoracoplasty, such as the Nuss Procedure, should not be performed simultaneously with cardiac surgery because abdominal and thoracic respiration can be restricted in infants, causing prolonged, severe, post-surgical respiratory failure.
    01/2015; 3(1):27-29. DOI:10.1016/j.epsc.2014.11.009
  • Takahiko Sakamoto, Yorikazu Harada
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    ABSTRACT: Although Norwood-type operation is a fundamental procedure for hypoplastic left heart syndrome and its variants, the surgical risk is still high even in the high volume center. Bilateral pulmonary artery (PA) banding( BPAB) is an alternative procedure to avoid the risk in the neonatal period. We clarified the impacts of BPAB on the surgical and long-term outcomes in HLHS and its variants. Consecutive 85 patients( classical HLHS:52, variant:33) who underwent surgical intervention between July, 1993 and December, 2012 were evaluated. Fetal diagnosis was done in 37 patients (44%). Forty-two patients underwent primary Norwood operation[ Gp N, Blalock-Taussig( BT):29, right-ventricle( RV)-PA conduit:13] and the remaining 43 patients underwent BPAB followed by Norwood operation. Among them, 4 patients did not reach Norwood [9%, atrioventricular valve regurgitation (AVVR):1, infection:1, preoperative shock:2). The survived 39 patients were divided into 2 groups;Gp BN (BPAB → Norwood+BT/RV-PA conduit, n=22), Gp BG [BPAB → Norwood+bidirectional Glenn procedure(BDG), n=17]. BPAB for HLHS and its variants is useful in terms of lower mortality. The 2ndstage palliation is so important that modified Norwood procedure with BT shunt or RV-PA conduit contribute to the lower morbidity including neurological outcome. Norwood+BDG strategy might be beneficial for the high risk patients such as with poor cardiac function or low body weight.
    Kyobu geka. The Japanese journal of thoracic surgery 04/2014; 67(4):278-285.
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    ABSTRACT: We report a 3-day-old boy with double outlet of the right ventricle and interruption of the aortic arch who developed spontaneous dissection of the arterial duct (DA) despite use of continuous infusion of lipo-prostaglandin E1 (PGE1). Transthoracic echocardiography demonstrated the spontaneous dissecting aneurysm of DA, which was confirmed by histology at the modified Norwood procedure done at age of 18 days. This is the first report of spontaneous dissection of DA in a neonate receiving PGE1, suggesting a new closing mechanism of DA.
    Journal of Echocardiography 12/2013; 11(4). DOI:10.1007/s12574-013-0188-7
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    ABSTRACT: Aortic arch thrombosis (AAT) of the neonate is rare but life-threatening by fatal compromise associated with thrombotic obstruction of the ascending aorta. We report a neonate with AAT who demonstrated a severe coarctation of the aorta and cerebral hypo-perfusion immediately after birth. Echocardiography confirmed the diagnosis of AAT on the findings of a large thrombus located on the transverse arch and blocking the cervical arterial branches. Low-molecular-weight heparin reduced the size of the thrombus and improved the hemodynamics of coarctation and cerebral perfusion. Echocardiography is a powerful tool to make a diagnosis and to monitor the size and regression of AAT.
    Journal of Echocardiography 06/2013; 11(2). DOI:10.1007/s12574-012-0151-z
  • The Annals of thoracic surgery 02/2013; 95(2):718. DOI:10.1016/j.athoracsur.2012.06.046 · 3.65 Impact Factor
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    ABSTRACT: The outcomes of the swing-back technique for aortic arch repair during the arterial switch and Norwood operations are not well reported. Between May 2004 and January 2011, we performed this technique during the arterial switch and Norwood operations in 2 and 4 patients, respectively. The median (range) patient age and body weight were 17 (12-147) days and 3.4 (2.2-6.1) kg, respectively. All patients survived the procedures. The median follow-up duration was 4 (1-8) years. One patient showed recoarctation in the early postoperative period, which was successfully repaired by a single-catheter intervention. The latest median pressure gradient across the neoaortic arch was 0 (0-6) mmHg. Neoaortic valve regurgitation was found to be minimal by echocardiography. During the follow-up period, the Fontan operation was performed in all the patients who underwent the Norwood operation. These results suggest that the swing-back technique yields satisfactory mid-term outcomes.
    European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 01/2013; 43(6). DOI:10.1093/ejcts/ezs682 · 2.81 Impact Factor
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    ABSTRACT: An aberrant right subclavian artery can be used in a variety of ways in complex aortic arch reconstructions, including reconstruction of an interrupted aortic arch. Here, we described the case of a 4-month-old female infant with a type B interrupted aortic arch, who underwent arch reconstruction using an aberrant right subclavian artery.
    General Thoracic and Cardiovascular Surgery 10/2012; DOI:10.1007/s11748-012-0171-7
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    ABSTRACT: We performed hybrid operation on a 3-year-old boy with thrombosis in the pulmonary arterial conduit which had been implanted concomitantly at the time of Fontan operation. We used a cholangioscope as a substitute of intravascular endoscope. It visualized the organized thrombus and the suture line in the conduit. Hybrid operation was successfully performed based on the detailed findings gained by cholangioscopy.
    Kyobu geka. The Japanese journal of thoracic surgery 08/2012; 65(9):785-9.
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    ABSTRACT: A 3-year-old girl underwent ventriclar septation using 2 patch technique. Echocardiography at birth revealed single left ventricle with pulmonary hypertension. Pulmonary artery banding was performed at the age of 1 month. Echocardiography at the age of 3 years showed total inlet-trabecular septal defect. Ventricular septation was performed through the right atrium. The tendon of Todaro and the coronary sinus were in normal positions. Almost all of the inlet septum and trabecular septum were deficit, although the posterior median ridge was present. It was considered that the atrio-ventricular node was shifted inferiorly and the conduction system ran down the inlet septum as in the case of atrioventricular septal defect, since this patient had concordant atrioventricular( AV) connection. It was difficult to form the septum using a single patch because of complicated anatomy. Thus we decided to divide the patch in order to make smooth surface avoiding conduction injury. One patch was used for the trabecular defect using running sutures and another patch was used for the inlet defect using pledgeted mattress sutures. Eventually both patches were sutured together to close the defect. Regular sinus rhythm resumed, although 2:1 AV block appeared temporally. The patient was discharged at postoperative day 30 without any complication.
    Kyobu geka. The Japanese journal of thoracic surgery 08/2012; 65(9):776-80.
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    ABSTRACT: Ascaris lumbricoides is the most common parasite affecting humans, especially in countries and regions with lower socio-economic conditions. A 2-year-old female child underwent right pulmonary angioplasty using cardiopulmonary bypass. Serious hyperthermia continued after surgery, and, therefore, a re-exploration of the mediastinum was performed because mediastinitis was suspected. No evidence of wound infection was revealed. Ascaris lumbricoides was subsequently isolated from her stool. The patient had no further hyperthermia throughout her hospitalization and was discharged uneventfully on post-operative day 12. The probable origin of the fever was an A. lumbricoides infection and ascariasis may cause the occurrence of serious hyperthermia during the perioperative period. Ascaris lumbricoides infection may, therefore, cause high-grade fever after cardiac surgery.
    General Thoracic and Cardiovascular Surgery 05/2012; 60(7):446-8. DOI:10.1007/s11748-012-0024-4
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    ABSTRACT: We ranked the haemodynamics and pulmonary artery (PA) configurations of Norwood with bidirectional Glenn shunt (NW-G) patients among the other staged Fontan completion (conventional) patients in this study. Between August 2001 and April 2010, 91 consecutive patients completed staged Fontan operations. Among them, NW-G was performed in 11. There was no operative or late death except in one case which resulted from a reoperation after Fontan completion. Although the age at bidirectional Glenn (BDG) and Fontan completion was younger in NW-G (4.2 vs. 10.9 months, P < 0.01, and 2.3 vs. 3.3 years, P < 0.01), the interval between BDG and Fontan completion was not significantly different in these groups (23.6 vs. 28.0 months, P = 0.71). On Fontan completion, the extracardiac conduit size was significantly different (16.4 vs. 17.7 mm, P < 0.01). However, the pulmonary artery size (PA index) and the PA pressure were not significantly different (165.4 vs. 205.1 mm(2)/m(2), P = 0.23, and 13.4 vs. 11.0 mmHg, P = 0.08). Particularly in hypoplastic left heart syndrome patients, the PA index was not significantly different between these groups (165.4 vs. 174.9 mm(2)/m(2), P = 0.59). The NW-G patients could have a subsequent Fontan completion with good results. There was no significant difference with respect to Fontan completion.
    Interactive Cardiovascular and Thoracic Surgery 05/2012; 15(2):204-8. DOI:10.1093/icvts/ivs138 · 1.11 Impact Factor
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    ABSTRACT: We report a successfully treated case of unilateral absence of a pulmonary artery, associated with an atrial septal defect and chronic lung disease with severe pulmonary hypertension. Because this severe pulmonary hypertension could jeopardize postoperative hemodynamic, the ingenuity of surgical strategy was required. The atrial septal defect was left open as a safety "pop-off" valve, and prosthetic graft was chosen as a reconstructive material to avoid excessive dilatation from exposure to unpredictable postoperative pulmonary hypertension.
    General Thoracic and Cardiovascular Surgery 05/2012; 60(6):367-9. DOI:10.1007/s11748-012-0006-6
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    ABSTRACT: Persistent 5th aortic arch (PFA) is a rare congenital cardiac anomaly that was firstly reported by Van Praagh et al, in 1969. A 3-month-old boy was referred to us with no symptom but heart murmur. Cardiac echocardiography and the following 3-dimensional computed tomography (3D-CT) scan revealed PFA with coarctation of aorta. There was pressure gradient of 50 mmHg between upper and lower limbs. He was carefully observed at the outpatient clinic because of no afterload mismatch. At the age of 9 months, coarctectomy and end-to-end anastomosis was performed between the PFA and distal arch below left vertebral artery. A histological examination of resected tissue revealed the thickened intima and rough elastic fiber that is absolutely different from normal aorta. Careful observation is necessary with the possibility of future aneurysmal change or re-coarctation, although the postoperative course has been so far uneventful.
    Kyobu geka. The Japanese journal of thoracic surgery 02/2012; 65(2):158-60.
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    ABSTRACT: The left superior vena cava (LSVC) is often complicated with congenital heart defect. Although we simply clamp LSVC during cardio-pulmonary bypass (CPB), appropriateness of this technique has not been clarified. We noninvasively evaluate cerebral tissue oxygenation while the clamping of LSVC under CPB by near-infrared spectroscopy (NIRS). Six children (3 male and 3 female; aged 1.0 +/- 0.6 year) undergoing open heart surgery were studied. The NIRO 300 was incorporated into an established multimodal monitoring system. Tissue oxygenation index (TOI), oxyhemoglobin (O2Hb), and deoxyhemoglobin (HHb) changes were assessed and compared with LSVC pressure. There were no significant changes in cerebral oxygen delivery after LSVC clamp. LSVC pressure increased from 7.3 +/- 1.8 mmHg to 20.1 +/- 2.6 just after LSVC clamp, but gradually decreased without any maneuver. These data demonstrated that LSVC could be safely clamped when LSVC pressure was under 30 mmHg.
    Kyobu geka. The Japanese journal of thoracic surgery 11/2011; 64(12):1061-4.
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    ABSTRACT: Background. The purpose of this study was to evaluate the surgical outcomes and pulmonary artery (PA) development associated with a new strategy wherein the modified Norwood (N) procedure is performed at 1-2 months after bilateral pulmonary artery banding (PAB). Methods. Between January 2008 and February 2010, 16 patients underwent Norwood-type operation after previous bilateral PAB. For analysis, patients were divided into two groups. Group I (n = 11) underwent modified Norwood procedure with either right modified Blalock Taussig (RMBT) shunt (n = 4) or right ventricle to pulmonary artery (RV-PA) conduit (n = 7). Group II (n = 5) underwent Norwood procedure plus bidirectional Glenn anastomosis. Diagnoses were hypoplastic left heart syndrome in 6 and its variants in 10. Results. There was no surgical death and no late death. Pulmonary artery interventions were performed at the time of the Norwood procedure in 27% in Group I and in 100% in Group II (p < 0.05). Additional PA interventions were performed during the period of follow-up in 4 cases in Group I (36.4%), and in 4 cases in Group II (80.0%). Additional Blalock Taussig shunts were performed in 7 patients, resulting in significant increase in PA index. In all, four patients have reached total cavopulmonary connection, and one has undergone biventricular repair. Eight patients in Group I and one patient in II Group reached bidirectional Glenn anastomosis. In Gp II, two patients showed LPA narrowing or obstruction with PA index of 80 ± 12 mm(2)/m(2). Conclusions. Regarding the second-stage palliation after bilateral PAB, modified Norwood procedure with either RMBT or RV-PA conduit has some advantages compared with Norwood plus BDG with respect to subsequent pulmonary artery development. Additional BT shunt may contribute to PA development, even in the patients with Norwood procedure with RV-PA conduit.
    10/2011; 2(4):558-565. DOI:10.1177/2150135111415428
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    ABSTRACT: The choice of appropriate treatment in children with aortic valvular lesions remains controversial. The purpose of this study is to assess early and late outcomes of aortic valve replacement with annular enlargement in children. A retrospective study was conducted in 16 consecutive patients aged 0.26 to 15.9 years operated on between 1993 and 2008. Thirteen children underwent aortic valve replacement with Konno procedure (mechanical valve: 12, homograft: 1), 2 children underwent Ross procedure, and the last child underwent Nicks procedure with mechanical valve replacement. All patients undergoing mechanical valve replacement were given warfarin with a monthly international normalized ratio (INR) control. Overall early mortality was 12.5% (2 cases). Emergency operation was performed in these cases because of infectious endocarditis and acute cardiac failure. However, cardiopulmonary bypass (CPB) weaning could not be obtained. There was 1 late death 5 months after mechanical valve replacement. The patient developed methicillin-resistant Staphylococcus aureus (MRSA) sepsis after cleft palate repair. Reoperation was needed in 1 case. We conclude that mechanical valve replacement with aortic annular enlargement is an acceptable treatment in children. It is associated with acceptable mortality and low incidence of late events, and provides long-term survival.
    Kyobu geka. The Japanese journal of thoracic surgery 09/2011; 64(10):882-6.
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    ABSTRACT: Interrupted aortic arch (IAA) is associated with a multitude of lesions ranging from isolated ventricular septal defect to hypoplastic left ventricle or severe subaortic stenosis (SAS). Left ventricular outflow obstruction such as SAS continues to be an important factor for deciding the surgical procedure between univentricular and biventricular repairs. A retrospective study was conducted in 8 consecutive infants aged 14 to 117 days and operated on between 2004 and 2009. Seven patients had undergone bilateral pulmonary artery banding for pulmonary high flow regulation. All patients underwent Norwood-type operation (4 with systemic to pulmonary artery shunt, 3 with right ventricle to pulmonary artery shunt, and 1 with bidirectional Glenn shunt). One patient died 2 months after surgery due to respiratory failure. The others were discharged in a good condition. One patient underwent Rastelli-type operation and biventricular circulation was achieved. The other 6 patients were all Fontan candidates. Satisfactory initial palliation can be achieved by Norwood-type operation for IAA with severe SAS or hypoplastic left ventricular-aortic complex.
    Kyobu geka. The Japanese journal of thoracic surgery 08/2011; 64(9):785-9; discussion 789-91.
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    ABSTRACT: Cardiobacterium hominis, a member of the HACEK group of organisms, is a rare cause of endocarditis. We report a case of infective endocarditis caused by C. hominis in a male child who had undergone right ventricular outflow tract (RVOT) reconstruction using an expanded polytetrafluoroethylene conduit for tetralogy of Fallot with pulmonary atresia. Two days before admission, the patient suffered from exertional shortness of breath. Right ventricular hypertension was confirmed and RVOT stenosis was suspected based on the echocardiography findings. A CT scan revealed vegetation above the cusp of the conduit. An emergency operation was performed to avoid a pulmonary embolism due to large friable vegetation. C. hominis was cultured from the blood and the vegetation, prompting a diagnosis of prosthetic valve endocarditis. The patient was discharged after a 6-week course of intravenous ceftriaxone therapy.
    General Thoracic and Cardiovascular Surgery 06/2011; 59(6):429-32. DOI:10.1007/s11748-010-0707-7
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    ABSTRACT: Operative correction of tetralogy of Fallot has been performed for more than 50 years and well established. To date, the literature on reoperation has focused and indications and the long-term outcome have not been well defined. We herein report a case of pulmonary valve replacement due to ectopic ossification on expanded polytetrafluoroethylene (ePTFE) cusp in a female child who had undergone right ventricular outflow tract reconstruction for tetralogy of Fallot with pulmonary atresia. Because of severe right ventricular dilatation with end diastolic volume of 186 ml/m2 on cardiac catheterization, redo operation was planned for functional recovery of the right ventricle. Previous transannlar patch was removed and pulmonary valve replacement was performed using CEP 23 mm. A hard calcification was observed around the cusp of transannular patch. Pathological findings revealed ectopic ossification with osteoblast colonization around the ePTFE cusp. This is the 1st report of ectopic ossification on ePTFE.
    Kyobu geka. The Japanese journal of thoracic surgery 03/2011; 64(3):249-53.
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    ABSTRACT: We report a female infant with acute coronary syndrome after Aubert-Imai modification for transposition of the great arteries. Two months postoperatively, she visited the emergency room because of perspiration and tachypnea. She was diagnosed with acute coronary syndrome by blood chemistry examination. Cardiac catheterization revealed Aubert route stenosis, and emergency operation was performed. The lumen around the aortopulmonary window was almost totally occluded by fibrous tissue extending from the equine pericardial patch. This fibrous tissue was completely resected and the aortopulmonary window was deepened to enlarge the coronary ostium. We recommend a close follow-up including angiography after these procedures.
    Kyobu geka. The Japanese journal of thoracic surgery 02/2011; 64(2):109-13.

Publication Stats

408 Citations
49.44 Total Impact Points


  • 2001–2012
    • Tokyo Women's Medical University
      • Department of Cardiovascular Surgery
      Tokyo, Tokyo-to, Japan
  • 2007
    • Kanagawa Children's Medical Center
      Yokohama, Kanagawa, Japan
  • 1998–1999
    • Higashi-Matsudo Municipal Hospital
      Matsudo, Chiba, Japan