Publications by authors named "Masanao Nakai"

Background: There is a paucity of data on safety of calcium channel blockers (CCB) in patients with severe aortic stenosis (AS) and hypertension.

Methods And Results: Among 2,460 patients with severe AS and hypertension receiving antihypertensive therapy in the CURRENT AS registry-2, we compared the clinical outcomes between patients taking antihypertensive therapy with CCB (CCB group) and without CCB (no CCB group). In the entire study population, CCB was prescribed in 1,763 patients (71.

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Article Synopsis
  • * TAVI centers preferred aortic valve replacement (AVR) treatments, with a higher percentage opting for transcatheter aortic valve implantation (TAVI) compared to non-TAVI centers (71% vs. 23%).
  • * Despite the differences in treatment frequency, both types of centers showed similar rates of all-cause death or heart failure hospitalizations over three years, indicating no significant outcome difference.
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A 66-year-old man developed exertional dyspnea. The patient had undergone total arch replacement for a dissecting aortic arch aneurysm at the age of 53 and conservative treatment for myocardial infarction at the age of 60. Several imaging studies revealed a giant pseudoaneurysm that likely originated from a true ventricular aneurysm.

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Article Synopsis
  • The study analyzed the presence of mitral regurgitation (MR) in patients with severe aortic stenosis (AS) and how it relates to different treatment methods: TAVI, SAVR, and conservative management.
  • Among the 3,365 patients examined, 384 (11.4%) had moderate/severe MR, and this group showed a significantly higher 3-year incidence of death or heart failure (HF) hospitalization compared to those with no/mild MR.
  • The risk of death or HF hospitalization was notably higher in patients treated with SAVR and conservative strategies, while this risk was less clear in those who underwent TAVI.
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Fenestrated endovascular repair (FEVAR) can be a treatment option for thoraco-abdominal aneurysm( TAAA), especially in the cases with high surgical risks. Spinal cord ischemic injury( SCI) continues to be the most devastating complication, that has multifactorial etiologies including embolic events and coverage of Adamkiewicz's artery (AKA). Recently, we experienced a case of Crawford III TAAA.

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There were no data comparing the in-hospital outcomes after transcatheter aortic valve implantation (TAVI) with those after surgical aortic valve replacement (SAVR) in Japan. Among consecutive patients with severe AS between April 2018 and December 2020 in the CURRENT AS Registry-2, we identified 1714 patients who underwent aortic valve replacement (TAVI group: 1134 patients, and SAVR group: 580 patients). Patients in the TAVI group were much older (84.

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Objectives: Surgical site infection in cardiovascular surgery had a great effect on postoperative outcomes. This study examined the current status of surgical site infection and postoperative outcomes used the registered data of the Japan Cardiovascular Surgery Database.

Methods: From the registry, we extracted 53,186 cases of thoracic cardiovascular surgery performed under median sternotomy in 2018.

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Article Synopsis
  • The CURRENT AS Registry-2 is a comprehensive study analyzing the management and outcomes of patients with severe aortic stenosis (AS) across 21 centers in Japan from April 2018 to December 2020.
  • The registry collected data from 3,394 patients, with an average age of 81.6 years, focusing on their symptoms, echocardiographic evaluations, and treatment approaches, including surgical and conservative management.
  • The findings suggest that the registry is a valuable resource for understanding when to intervene in severe AS cases, helping to improve clinical practices in managing the condition.
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An 80-year-old woman with essential thrombocythemia was diagnosed with severe mitral regurgitation and moderate tricuspid regurgitation. Preoperatively, she had been treated with hydroxycarbamide and low-dose aspirin since her platelet count was high( 96.2×104/μl).

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We present a successful case of the management of a 46-year-old woman with an abnormal aortic valve formed by four cusps (three equal large cusps and one smaller cusp; type B according to the Hurwitz and Roberts classification) with a marked loss of coaptation that caused a severe aortic insufficiency (AI). The patient underwent an aortic valvuloplasty of the defect using the glutaraldehyde (GA)-pretreated autologous pericardium, restoring the subnormal function and competency of the aortic valve. The postoperative course was unremarkable.

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Background: There are no data comparing transcatheter aortic valve implantation (TAVI) with surgical aortic valve replacement (SAVR) outcomes in real clinical practice in Japan.

Methods and results: We combined 2 independent registries, the K-TAVI Registry (a 6-center prospective registry of consecutive patients who underwent TAVI) and the CURRENT AS Registry (a large, 27-center registry of 3,815 consecutive patients with severe aortic stenosis [AS]). In the K-TAVI Registry, 338 patients underwent TAVI with SAPIEN XT balloon-expandable valves from October 2013 to January 2016, whereas in the CURRENT AS Registry 237 patients with severe AS underwent SAVR from January 2003 to December 2011.

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The GORE EXCLUDER Iliac Branch Endoprosthesis (IBE; W. L. Gore and Associates, Flagstaff, AZ, USA) applicability is limited by the aorto-iliac length (AOL).

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The medical uses of three-dimensional (3D) printing are evolving at a rapid pace. The current roles and the future outlooks of this technology for physician-modified endovascular graft (PMEG) in patients with juxtarenal aneurysm are discussed. Fenestrations of PMEG are designed taking into account the geometry of the stent graft.

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Background: Transcatheter aortic valve implantation (TAVI) is criticized by some as an expensive treatment in super-elder patients with limited life expectancy. However, there is a knowledge gap regarding the magnitude of clinical benefit provided by TAVI in comparison with conservative management in patients with severe aortic stenosis (AS) in real clinical practice, which would be important in the decision making for TAVI.

Methods: We combined two independent registries, namely CURRENT AS and K-TAVI registries.

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A 48-year-old man underwent aortic root remodeling for a giant aneurysm of sinus of Valsalva, 98 mm in diameter, as well as a bicuspid aortic valve. The aortic valve was defined as type 0(L-R) according to Sievers classification and the aortic annulus was highly dilated up to 35 mm. Geometric height of the left and right cusps were 22 mm and 32 mm in diameter, respectively.

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Background: Very limited data exist on the outcomes of transcatheter aortic valve implantation (TAVI) since Japanese marketing approval of the first TAVI device.Methods and Results:The Kyoto University-related hospital Transcatheter Aortic Valve Implantation (K-TAVI) registry includes prospectively collected data from 6 participating hospitals in Japan. We included 302 patients with severe aortic stenosis who underwent TAVI using the SAPIEN XT balloon-expandable valve via transfemoral (TF; n=203, 67%) or transapical (TA; n=99, 33%) approach between October 2013 and September 2015.

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Article Synopsis
  • - Tricuspid annuloplasty can lead to a rare complication involving injury to the right coronary artery (RCA).
  • - The case study discusses a patient who suffered right ventricular (RV) infarction as a result of this surgical procedure.
  • - The report also covers various management options available for addressing this complication.
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Various treatment options are currently available for spontaneous isolated dissection of the superior mesenteric artery (SIDSMA) including conservative management, anticoagulation therapy, endovascular stenting, and surgical repair. We report an experience with retrograde open mesenteric stenting for SIDSMA. A 45-year-old man presented to the emergency department with acute onset of severe abdominal and back pain.

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Myocardial ischemia due to acute type A dissection is a fatal complication. This study was undertaken to evaluate the surgical results of acute type A aortic dissection with myocardial ischemia. Between 1986 and 2014, 364 patients were treated for acute type A dissection in our hospital.

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Background: To report a rare case of acute abdominal aortic aneurysm (AAA) occlusion successfully treated by endovascular aneurysm repair (EVAR).

Case Report: An 89-year-old man complained of severe back pain and weakness in the bilateral lower extremities. Although there were neither acute ischemic signs on the brain computed tomography (CT) nor critical leg ischemia, the patient presented progressing weakness in the bilateral lower extremities and decreased sensation in the perianal and saddle area.

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The patient was a 67-year-old man. He was admitted to a local hospital with severe back pain, and left hydrothorax was noted by a chest X-ray. Then, he went into shock and was transferred to our hospital.

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A 67-year-old man underwent elective percutaneous coronary intervention (PCI) of the left anterior descending artery. The major septal branch became occluded during coronary stenting. The patient developed dyspnea 19 days later.

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Purpose: Although the outcomes of aortic arch surgery have improved, stroke remains one of the most devastating complications. Therefore, identification of true risk factors and understanding the pathogenesis of intraoperative stroke are necessary to decrease its occurrence.

Methods: From January 2002 to December 2010, a total of 251 consecutive patients underwent aortic arch surgery under deep hypothermic circulatory arrest and antegrade selective cerebral perfusion in our hospital.

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We report two cases of adults who had occlusion of the left coronary artery ostium by the left coronary cusp. Both patients were treated with the Bentall procedure, and both revealed a good, long-term course. We offer proper strategy of perioperative management consisting of precise preoperative diagnosis with a multimodality imaging study and adequate operative technique.

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