Search results for: Keiji Kamohara

Items from 1 to 20 out of 36 results

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Giant aneurysmal coronary artery fistula originating from the left circumflex artery: Two case reports

Motonori Uchino, Keiji Kamohara, Yuichi Koga, Hiroyuki Morokuma

Journal of Cardiac Surgery > 36 > 10 > 3955 - 3958

Coronary artery fistula (CAF) is one of the most common coronary artery anomalies. The most common fistulas originate from the right coronary artery and drain into the right heart structures. Due to the variety of coronary fistulas, the surgical treatment strategy is individualized for each case. We report two cases of giant aneurysmal CAF originating from the left circumflex artery. One case required...

article

Long-term durability of preserved aortic root after repair of acute type A aortic dissection

Keiji Kamohara, Shugo Koga, Jun Takaki, Nozomi Yoshida, more

General Thoracic and Cardiovascular Surgery > 2017 > 65 > 8 > 441-448

Background Optimal management of aortic root in type A aortic dissection (AAD) is controversial. To determine the most appropriate strategy, we studied the late outcomes after conservative repair of aortic root. Methods 234 AAD patients (mean age 68 ± 12 years) underwent surgical repair using supracommissural replacement (SCR) for aortic root reconstruction from 1989 to 2014. Ascending aortic replacement...

article

Should the annulus be fixed in aortic valve-sparing root replacement with remodeling?

Kojiro Furukawa, Keiji Kamohara, Junji Yunoki, Shugo Koga, more

General Thoracic and Cardiovascular Surgery > 2017 > 65 > 4 > 200-205

Objectives If the aortic root dilates after native aortic valve-sparing root reconstruction with remodeling, aortic regurgitation may recur. However, it has not been demonstrated clearly that the aortic root dilates after remodeling. Methods This study enrolled 15 patients who underwent an aortic valve-sparing operation with remodeling (2002–2014) but without any ventriculo-aortic junction (VAJ)...

article

Development of a three-dimensional pre-vascularized scaffold-free contractile cardiac patch for treating heart disease

Ryo Noguchi, Koichi Nakayama, Manabu Itoh, Keiji Kamohara, more

The Journal of Heart and Lung Transplantation > 2016 > 35 > 1 > 137-145

The aim of our study was to develop a completely scaffold-free, viable, contractile cardiac tissue capable of being grafted into the damaged native heart.Our technology is based on the fundamental characteristics of the self-assembling nature of cells. We created contractile cardiac spheroids by plating a mixture of rat neonatal ventricular cardiomyocytes, human dermal fibroblasts, and human coronary...

article

Surgical Strategy for Retrograde Type A Aortic Dissection Based on Long-Term Outcomes

Keiji Kamohara, Kojiro Furukawa, Shugo Koga, Junji Yunoki, more

The Annals of Thoracic Surgery > 2015 > 99 > 5 > 1610-1615

The optimal management of a retrograde type A aortic dissection (RAAD) is controversial, and few reports have discussed the long-term outcomes of surgical strategies. To determine the most appropriate strategy, we studied the early and late outcomes of RAAD cases.From 1998 to 2014, 44 patients with RAAD (mean age of 63 ± 11 years) underwent surgical repair. Ascending aortic replacement (AAR) was performed...

article

Operative technique for tracheo-innominate artery fistula repair

Kojiro Furukawa, Keiji Kamohara, Manabu Itoh, Hiroyuki Morokuma, more

Journal of Vascular Surgery > 2014 > 59 > 4 > 1163-1167

Tracheo-innominate artery fistula is fatal unless treated surgically. We describe our surgical approach and results in seven patients. The average patient age was 15.7 years; all patients had prior severe neurological deficits. Three of seven patients were in hemorrhagic shock; control of preoperative bleeding was achieved with tracheostomy tube cuff overinflation. The innominate artery and the trachea...

article

Reply

Keiji Kamohara, Kojiro Furukawa, Shigeki Morita

The Annals of Thoracic Surgery > 2012 > 94 > 1 > 335

article

Staged Resternotomy for a Retrosternal Giant Aneurysm of the Thoracic Aorta Using an Inferior T-Shaped Ministernotomy

Keiji Kamohara, Kojiro Furukawa, Kazuyoshi Doi, Manabu Itoh, more

The Annals of Thoracic Surgery > 2011 > 92 > 5 > 1911-1913

We describe a staged resternotomy technique using an inferior T-shaped ministernotomy for three redo cases with a retrosternal aortic arch aneurysm. To minimize the disadvantages of resternotomy during closed-chest hypothermia, an inferior T-shaped ministernotomy was performed before approaching the aneurysm. After establishment of the cardiopulmonary bypass with femoral or axillary arterial cannulation,...

article

Real-Time Three-Dimensional Transesophageal Echocardiography Is Useful for the Localization of a Small Mitral Paravalvular Leak

Kojiro Furukawa, Keiji Kamohara, Manabu Itoh, Akira Furutachi, more

The Annals of Thoracic Surgery > 2011 > 91 > 5 > e72-e73

The use of multiplane transesophageal echocardiography (TEE) to reconstruct 3-dimensional (3D) images is limited by time-consuming, multiplane image acquisition and the need for offline processing. To overcome these limitations, a 3D fully sampled matrix array transducer was recently developed to allow real-time acquisition and online display of 3D images. In this case, real-time 3D transesophageal...

article

Operative Strategy for Descending and Thoracoabdominal Aneurysm Repair With Preoperative Demonstration of the Adamkiewicz Artery

Kojiro Furukawa, Keiji Kamohara, Junichi Nojiri, Yoshiaki Egashira, more

The Annals of Thoracic Surgery > 2010 > 90 > 6 > 1840-1846

Our study aimed to demonstrate the efficacy of preoperative intraarterial computed tomographic angiography to identify the Adamkiewicz artery (AKA). We also aimed to investigate the impact of identification of the AKA on the strategy for preventing spinal cord injury.Thirty-seven patients (24 cases of descending aortic aneurysms and 13 cases of thoracoabdominal aortic aneurysms), were studied. Average...

article

Preoperative Evaluation of the Right Gastroepiploic Artery on Multidetector Computed Tomography in Coronary Artery Bypass Graft Surgery

Keiji Kamohara, Naoki Minato, Noritoshi Minematsu, Junji Yunoki, more

The Annals of Thoracic Surgery > 2008 > 86 > 5 > 1444-1449

The right gastroepiploic artery (GEA) is commonly used in coronary artery bypass grafting, but a method for preoperative assessment of the suitability of the GEA has not been established. Here, we assessed the efficacy of 64-slice multidetector computed tomography (MDCT) for this purpose.Multidetector computed tomography was performed for 32 patients (24 males, 8 females; mean age, 65.9 ± 7.4 years)...

article

Reduced Pulsatility Induces Periarteritis in Kidney: Role of the Local Renin–Angiotensin System

Chiyo Ootaki, Michifumi Yamashita, Yoshio Ootaki, Keiji Kamohara, more

The Journal of Thoracic and Cardiovascular Surgery > 2008 > 136 > 1 > 150-158

The need for pulsatility in the circulation during long-term mechanical support has been a subject of debate. We compared histologic changes in calf renal arteries subjected to various degrees of pulsatile circulation in vivo. We addressed the hypothesis that the local renin–angiotensin system may be implicated in these histologic changes.Sixteen calves were implanted with devices giving differing...

article

Acute Reduction of Functional Mitral Regurgitation in Canine Model Using an Epicardial Device

Masatoshi Akiyama, Zoran B. Popović, Keiji Kamohara, Faruk Cingoz, more

The Annals of Thoracic Surgery > 2008 > 85 > 5 > 1771-1775

This study evaluated the short-term feasibility of a novel epicardial device that treats functional mitral regurgitation by simultaneously changing the mitral and the left ventricular geometry.We implanted a prototype device that consists of 2 tissue anchors, a deflector, and a flexible tightening chord in 7 mongrel dogs with heart failure and functional mitral regurgitation induced by rapid ventricular...

article

Beating Heart Cardioscopy: A Platform for Real-Time, Intracardiac Imaging

Tomislav Mihaljevic, Yoshio Ootaki, Jason O. Robertson, Amir K. Durrani, more

The Annals of Thoracic Surgery > 2008 > 85 > 3 > 1061-1065

The purpose of this study was to develop a method for real-time, fiberoptic, intracardiac imaging to serve as a platform for closed-chest, intracardiac surgery on the beating heart.Fiberoptic cardioscopy of the left and right heart was conducted in a porcine model. A cardiopulmonary bypass circuit maintained systemic organ perfusion and a separate circuit replaced intracardiac blood with oxygenated,...

article

Surgical management and treatment of a traumatic right atrial rupture

Takeshi Hakuba, Naoki Minato, Toshinori Minematsu, Keiji Kamohara

General Thoracic and Cardiovascular Surgery > 2008 > 56 > 11 > 551-554

We have treated three patients with blunt traumatic right atrial rupture, all of whom survived after an emergent cardiac repair without cardiopulmonary bypass. Cardiac tamponade was seen in two of the three cases on ultrasonographic cardiography (UCG). The site of rupture was the right atrial appendage in two cases and the superior vena cava-right atrial (SVC-RA) junction in one case. Hemostasis had...

article

Reply to the Editor

Keiji Kamohara, Zoran B. Popović, A. Marc Gillinov, Kiyotaka Fukamachi

The Journal of Thoracic and Cardiovascular Surgery > 2007 > 134 > 2 > 550

article

Ventral cardiac denervation increased right coronary arterial blood flow

Yoshio Ootaki, Keiji Kamohara, Masatoshi Akiyama, Firas Zahr, more

International Journal of Cardiology > 2007 > 114 > 3 > 309-314

Cardiac denervation accompanied with coronary artery bypass surgery has been widely performed for the treatment of vasospastic angina associated with atherosclerotic coronary artery disease. However, the effect of cardiac denervation on phasic coronary blood flow patterns of the left anterior descending coronary artery (LAD), left circumflex coronary artery (LCX) and right coronary artery (RCA) remains...

article

Impact of left atrial appendage exclusion on left atrial function

Keiji Kamohara, Zoran B. Popović, Masao Daimon, Maureen Martin, more

The Journal of Thoracic and Cardiovascular Surgery > 2007 > 133 > 1 > 174-181

We sought to investigate the short-term and midterm effects of left atrial appendage exclusion on left atrial function. Left atrial appendage exclusion is considered a possible therapeutic option for stroke prevention in patients with atrial fibrillation. Favorable outcomes have encouraged widespread use of left atrial appendage exclusion for cardiac surgical patients—even for patients in sinus rhythm...

article

Safety of perioperative hemodialysis and continuous hemodiafiltration for dialysis patients with cardiac surgery

Keiji Kamohara, Masaru Yoshikai, Junji Yunoki, Hideyuki Fumoto, more

General Thoracic and Cardiovascular Surgery > 2007 > 55 > 2 > 43-49

Objective We have routinely used postoperative continuous hemodiafiltration (CHDF) combined with intraoperative hemodialysis (IHD) for dialysis patients undergoing open-heart surgery. This perioperative management could avoid any limitation of potassium concentration in the cardioplegic solution, strict restriction of fluid administration, or blood transfusion. Methods To evaluate the safety of...

article

Evaluation of a novel device for left atrial appendage exclusion: The second-generation atrial exclusion device

Keiji Kamohara, Kiyotaka Fukamachi, Yoshio Ootaki, Masatoshi Akiyama, more

The Journal of Thoracic and Cardiovascular Surgery > 2006 > 132 > 2 > 340-346

The left atrial appendage is a frequent source of thromboemboli in patients with atrial fibrillation. Exclusion of the left atrial appendage may reduce the risk of stroke in patients with atrial fibrillation. The atrial exclusion device, previously developed to perform left atrial appendage exclusion on a beating heart, was modified to accommodate different anatomic patterns of the human left atrial...

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INFONA - science communication portal

Search results for: Keiji Kamohara

Giant aneurysmal coronary artery fistula originating from the left circumflex artery: Two case reports

Long-term durability of preserved aortic root after repair of acute type A aortic dissection

Should the annulus be fixed in aortic valve-sparing root replacement with remodeling?

Development of a three-dimensional pre-vascularized scaffold-free contractile cardiac patch for treating heart disease

Surgical Strategy for Retrograde Type A Aortic Dissection Based on Long-Term Outcomes

Operative technique for tracheo-innominate artery fistula repair

Reply

Staged Resternotomy for a Retrosternal Giant Aneurysm of the Thoracic Aorta Using an Inferior T-Shaped Ministernotomy

Real-Time Three-Dimensional Transesophageal Echocardiography Is Useful for the Localization of a Small Mitral Paravalvular Leak

Operative Strategy for Descending and Thoracoabdominal Aneurysm Repair With Preoperative Demonstration of the Adamkiewicz Artery

Preoperative Evaluation of the Right Gastroepiploic Artery on Multidetector Computed Tomography in Coronary Artery Bypass Graft Surgery

Reduced Pulsatility Induces Periarteritis in Kidney: Role of the Local Renin–Angiotensin System

Acute Reduction of Functional Mitral Regurgitation in Canine Model Using an Epicardial Device

Beating Heart Cardioscopy: A Platform for Real-Time, Intracardiac Imaging

Surgical management and treatment of a traumatic right atrial rupture

Reply to the Editor

Ventral cardiac denervation increased right coronary arterial blood flow

Impact of left atrial appendage exclusion on left atrial function

Safety of perioperative hemodialysis and continuous hemodiafiltration for dialysis patients with cardiac surgery

Evaluation of a novel device for left atrial appendage exclusion: The second-generation atrial exclusion device

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