Sakakibara Heart Institute of Okayama

of Okayama, Japan

Sakakibara Heart Institute of Okayama

of Okayama, Japan
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Tokioka K.,Okayama University of Science | Kusano K.F.,Japan National Cardiovascular Center Research Institute | Morita H.,Okayama University of Science | Miura D.,Okayama University of Science | And 6 more authors.
Journal of the American College of Cardiology | Year: 2014

Objectives This study aimed to determine the usefulness of the combination of several electrocardiographic markers on risk assessment of ventricular fibrillation (VF) in patients with Brugada syndrome (BrS). Background Detection of high-/low-risk BrS patients using a noninvasive method is an important issue in the clinical setting. Several electrocardiographic markers related to depolarization and repolarization abnormalities have been reported, but the relationship and usefulness of these parameters in VF events are unclear. Methods Baseline characteristics of 246 consecutive patients (236 men; mean age, 47.6 ± 13.6 years) with a Brugada-type electrocardiogram, including 13 patients with a history of VF and 40 patients with a history of syncope episodes, were retrospectively analyzed. During the mean follow-up period of 45.1 months, VF in 23 patients and sudden cardiac death (SCD) in 1 patient were observed. Clinical/genetic and electrocardiographic parameters were compared with VF/SCD events. Results On univariate analysis, a history of VF and syncope episodes, paroxysmal atrial fibrillation, spontaneous type 1 pattern in the precordial leads, and electrocardiographic markers of depolarization abnormalities (QRS duration >120 ms, and fragmented QRS [f-QRS]) and those of repolarization abnormalities (inferolateral early repolarization [ER] pattern and QT prolongation) were associated with later cardiac events. On multivariable analysis, a history of VF and syncope episodes, inferolateral ER pattern, and f-QRS were independent predictors of documented VF and SCD (odds ratios: 19.61, 28.57, 2.87, and 5.21, respectively; p < 0.05). Kaplan-Meier curves showed that the presence/absence of inferolateral ER and f-QRS predicted a worse/better prognosis (log-rank test, p < 0.01). Conclusions The combination of depolarization and repolarization abnormalities in BrS is associated with later VF events. The combination of these abnormalities is useful for detecting high- and low-risk BrS patients. © © 2014 by the American College of Cardiology Foundation Published by Elsevier Inc.

Take Y.,Okayama University of Science | Morita H.,Okayama University of Science | Toh N.,Okayama University of Science | Nishii N.,Okayama University of Science | And 5 more authors.
Heart Rhythm | Year: 2012

BACKGROUND: Syncope in patients with Brugada syndrome is usually associated with ventricular tachyarrhythmia, but some episodes of syncope can be related to autonomic disorders. OBJECTIVE: The purpose of this study was to investigate the characteristics of syncope to differentiate high-risk syncope episodes from low-risk events in patients with Brugada syndrome. METHODS: We studied 84 patients with type 1 electrocardiogram and syncope. Patients were divided into 2 groups: patients with prodrome (prodromal group; n = 41) and patients without prodrome (nonprodromal group; n = 43). RESULTS: Ventricular fibrillation (VF) was documented at index event in 19 patients: 4 patients (21%) with documented VF experienced a prodrome prior to the onset of VF, whereas 15 patients (79%) did not have symptoms prior to documented VF (P <.01). Twenty-seven patients in the prodromal group and 7 patients in the nonprodromal group were considered to have syncope related to autonomic dysfunction. Syncope in other patients was defined as unexplained syncope. During the follow-up period (48 ± 48 months), recurrent syncope due to VF occurred in 13 patients among patients with only unexplained syncope and was more frequent in the nonprodromal group (n = 10) than in the prodromal group (n = 3; P = .044). In multivariate analysis, blurred vision (hazard ratio [HR] 0.20) and abnormal respiration (HR 2.18) and fragmented QRS (HR 2.39) were independently associated with the occurrence of VF. CONCLUSION: Syncope with prodrome, especially blurred vision, suggests a benign etiology of syncope in patients with Brugada syndrome. © 2012 Heart Rhythm Society.

Take Y.,Okayama University of Science | Take Y.,Sakakibara Heart Institute of Okayama | Morita H.,Okayama University of Science
Indian Pacing and Electrophysiology Journal | Year: 2012

Fragmented QRS (fQRS) is a convenient marker of myocardial scar evaluated by 12-lead electrocardiogram (ECG) recording. fQRS is defined as additional spikes within the QRS complex. In patients with CAD, fQRS was associated with myocardial scar detected by single photon emission tomography and was a predictor of cardiac events. fQRS was also a predictor of mortality and arrhythmic events in patients with reduced left ventricular function. The usefulness of fQRS for detecting myocardial scar and for identifying high-risk patients has been expanded to various cardiac diseases, such as cardiac sarcoidosis, arrhythmogenic right ventricular cardiomyopathy, acute coronary syndrome, Brugada syndrome, and acquired long QT syndrome. fQRS can be applied to patients with wide QRS complexes and is associated with myocardial scar and prognosis. Myocardial scar detected by fQRS is associated with subsequent ventricular dysfunction and heart failure and is a substrate for reentrant ventricular tachyarrhythmias.

Tamura K.,Sakakibara Heart Institute of Okayama | Uchida N.,Hiroshima University | Katayama A.,Hiroshima City Asa Hospital | Sutoh M.,Hiroshima City Asa Hospital | And 2 more authors.
Journal of Thoracic and Cardiovascular Surgery | Year: 2014

Objective The operative strategies for retrograde acute type A aortic dissection with a primary intimal tear remain controversial because resection of an intimal tear via a median sternotomy is difficult. We evaluated the frozen elephant trunk technique for treating this type of aortic dissection. Methods The frozen elephant trunk technique was used for acute retrograde type A aortic dissection with a primary intimal tear in the descending aorta in 25 consecutive patients (16 men, 9 women; median age, 64 years) seen between 1997 and 2011 at the Hiroshima City Asa Hospital. Three patients had Marfan syndrome. Fourteen patients had ischemia of the lower half of the body, 2 had stroke, 3 had coronary ischemia, and 10 had pericardial tamponade. Results There were no hospital deaths. Postoperative complications occurred in 2 patients, including stroke and mediastinitis. Two late deaths occurred over a median follow-up period of 58 months (12-169 months), one caused by stroke and the other by colon cancer. Two patients needed additional operations: one required a second operation for descending aorta replacement because of ulceration caused by the stent graft, and the other required an endovascular stent graft because of dilatation of the descending aorta. Computed tomography follow-up scans revealed that the false lumen was completely thrombosed and obliterated in all 25 patients with stent grafts. Conclusions The frozen elephant trunk technique for retrograde type A aortic dissection yielded acceptable outcomes, despite the high preoperative morbidity, and might improve the prognosis of dissection. Copyright © 2014 by The American Association for Thoracic Surgery.

Okura H.,Nara Medical University | Kataoka T.,Bell Land General Hospital | Yoshida K.,Sakakibara Heart Institute of Okayama
Heart | Year: 2016

Objectives: Secondary mitral regurgitation (MR) is negatively related to the prognosis of patients with myocardial infarction (MI). Renin-angiotensin system inhibitors (RASI) may favourably affect left ventricular remodelling and reduce afterload and thereby improve prognosis of secondary MR. The aim of this study was to investigate if use of RASI improves prognosis of patients with MI with secondary MR. Methods: A total of 953 patients with MI were enrolled in this study. Long-term prognosis was compared between patients with MI with no/mild MR (n=657), moderate MR (n=196) and severe MR (n=100). Patients with MI with significant (≥moderate) secondary MR were further divided into those treated with and without RASI. Survival and cardiac-event (all-cause death and congestive heart failure)-free survival were compared. Results: Long-term survival was significantly associated with severity of MR (log-rank, p<0.0001). In patients with significant MR (n=296), RASI was used in 130 patients (44%) and not used in 166 patients (56%). Ejection fraction (47.3±12.2 vs 46.6±13.4%, p=NS) and E/e′ (18.4±8.1 vs 16.5±7.0, p=NS) were similar between the two groups. Kaplan-Meier curves for cardiac-event-free survival demonstrated that use of RASI was associated with better survival ( p=0.006) as well as event-free survival ( p=0.02). By univariable and multivariable Cox proportional hazard analysis, age (HR 1.046, 95% CI 1.002 to 1.091, p=0.039) and RASI (HR 0.480, 95% CI 0.231 to 0.995), p=0.048) were independent predictors of cardiac events. Conclusions: Secondary MR affects prognosis in patients with MI. Use of RASI may be associated with better long-term prognosis in patients with MI with significant MR. © 2016, BMJ Publishing Group. All rights reserved.

Kobayashi Y.,Sakakibara Heart Institute of Okayama | Hirohata A.,Sakakibara Heart Institute of Okayama
Journal of Invasive Cardiology | Year: 2014

Increased level of serum catecholamines in the acute phase was reported to be a feature of takotsubo cardiomyopathy (TC). We report a TC case with pheochromocytoma, which caused a stir in the diagnosis of TC and suggests the importance of screening for a catecholamine-producing tumor. A female patient was referred to our emergency department due to ongoing chest pain. Coronary angiography showed no abnormality; however, subsequent left ventriculography showed basal hyperkinesis and apical ballooning, which completely recovered in 2 weeks. She experienced significant emotional stress on the eve of her admission, to which the diagnosis of TC was attributed. Although serum catecholamine levels on admission in our case were higher than on day 14, the value on day 14 was much higher than the normal range in our patient. The screening abdominal computed tomography scan revealed a left adrenal mass, which was diagnosed as pheochromocytoma by 24-hour urinary excretion of catecholamine and (131)I-MIBG scintigraphy. The mass was successfully resected and pathological findings supported the diagnosis. In our case, emotional stress was thought to be the direct trigger to develop TC by exceeding the threshold of catecholamine-induced cardiomyopathy. Screening for a catecholamine-producing tumor through careful history-taking and measuring catecholamines at a follow-up stage were important clinical aspects in this case and may well be for others.

Hiraoka A.,Sakakibara Heart Institute of Okayama | Kuinose M.,Sakakibara Heart Institute of Okayama | Chikazawa G.,Sakakibara Heart Institute of Okayama | Yoshitaka H.,Sakakibara Heart Institute of Okayama
Interactive Cardiovascular and Thoracic Surgery | Year: 2013

Left ventricular pseudoaneurysm (LVPA) is a known serious complication of myocardial infarction or mitral valve replacement. As an alternative option, transmitral patch repair for LVPA has been reported. However, it is very difficult to complete the procedure for LVPA with a large defect. A 68-year old man with a history of inferior myocardial infarction had undergone mitral valve repair. At 4 months after surgery, the presence of a giant LVPA in the posteroinferior left ventricular wall was revealed. We performed transmitral patch repair through minithoracotomy under a three-dimensional videoscope. Since the intracardiac operation was performed under only camera vision, the perspective supplied by the three-dimensional videoscope was very useful. Endoscopic patch repair was a much less invasive procedure, and we could obtain a great intracardiac view. This technique can be an appropriate option for the treatment of LVPA after cardiac surgery. © 2012 The Author.

Tsunoda M.,Sakakibara Heart Institute of Okayama
Japanese Journal of Clinical Radiology | Year: 2015

Isophasic images with uniform distribution of contrast medium can be obtained on 320-detector-row computed tomography (CT) by using simultaneous data acquisition of the whole imaging volume. The shunt flow is visualized as the positive or negative contrast jet in routine coronary CT angiography by using an optimized administration protocol of contrast medium and saline chaser to fill the left side of the heart with contrast medium and wash out the right side of the heart. Various diseases with intercardiac and/or cardiopulmonary shunt were diagnosed with the positive or negative contrast jets.

Hiraoka A.,Sakakibara Heart Institute of Okayama | Chikazawa G.,Sakakibara Heart Institute of Okayama | Tamura K.,Sakakibara Heart Institute of Okayama | Totsugawa T.,Sakakibara Heart Institute of Okayama | And 2 more authors.
Journal of Vascular Surgery | Year: 2015

Objective The aim of this study was to evaluate the midterm clinical outcomes of various approaches, including hybrid procedures, to aortic arch pathologies. Methods Of 305 consecutive patients who underwent aortic arch repair between 2005 and 2013, 244 underwent conventional open total aortic arch repair (CTAR) with antegrade cerebral perfusion under circulatory arrest, 35 underwent debranching of the arch with thoracic endovascular aortic repair (DTEVAR), and 26 underwent staged TEVAR after TAR with elephant trunk (TARET). We retrospectively evaluated the outcomes of the three groups. Results The DTEVAR group had a greater percentage of patients with preoperative comorbidities. Significant differences were observed in 30-day mortality (DTEVAR, 14.3% [5 of 35] vs TARET TEVAR, 0% [0 of 26] vs CTAR, 5.3% [13 of 244]; P =.045) and stroke (DTEVAR, 28.6% [10 of 35] vs TARET TEVAR, 7.7% [2 of 26] vs CTAR, 8.2% [20 of 244]; P =.001). In overall midterm survival, the DTEVAR group had a lower survival rate (63.9% 3-year survival) compared with the CTAR (90.1% 7-year survival) and the TARET TEVAR (95.5% 2.5-year survival) groups. In elective cases, better midterm results were observed in CTAR and TARET TEVAR groups. An increased number of debranching graft and emergency operations resulted in a much lower follow-up survival rate in the DTEVAR group. Atherosclerotic disease had a great effect on midterm outcomes in the DTEVAR (P =.045) and CTAR groups (P =.002). Conclusions The clinical feasibility of DTEVAR for high-risk patients requiring zone 0 landing or emergency surgery is still controversial. Atherosclerotic disease of the aorta has a significant negative effect on midterm outcomes in any surgical approach. © 2015 Society for Vascular Surgery.

Hiraoka A.,Sakakibara Heart Institute of Okayama | Totsugawa T.,Sakakibara Heart Institute of Okayama | Kuinose M.,Sakakibara Heart Institute of Okayama | Nakajima K.,Tokyo Medical University | And 4 more authors.
Circulation Journal | Year: 2014

Background: Right mini-thoracotomy and partial sternotomy are widely recognized as effective approaches in minimally invasive aortic valve replacement (AVR). The aim of this study was to evaluate the objective benefits of the respective approaches compared to the conventional approach.Methods and Results: A retrospective analysis was performed in 282 consecutive patients who underwent isolated and initial AVR at a single cardiovascular institute between May 2007 and December 2012. Mini-thoracotomy and partial sternotomy were performed in 62 (22%) and in 26 patients (9%), respectively. Propensity score matching produced 36 (mini-thoracotomy vs. full sternotomy) and 24 (partial sternotomy vs. full sternotomy) well-matched pairs. Compared to the conventional approach, mini-thoracotomy was associated with significantly shorter operative time (235±35 min vs. 272±73 min; P=0.009), lower prevalence of blood transfusion (42%, 15/36 vs. 67%, 24/36; P=0.025), and significantly shorter intensive care unit and postoperative hospital stay (1.4±0.8 days vs. 2.2±1.1 days, P=0.001; and 13.3±6.5 days vs. 21.5±10.3 days, P=0.001; respectively). There were no significant differences in operative and postoperative data between the partial sternotomy and full sternotomy groups.Conclusions: The objective benefits of right mini-thoracotomy included early rehabilitation and lower prevalence of blood transfusion. Significant advantages of partial sternotomy were not found. © 2014, Japanese Circulation Society. All rights reserved.

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