Publications by authors named "Kiyotaka Hao"

Background: There are limited data on the efficacy of smartphone-based personal health records (PHRs) in patients with cardiovascular disease. This study aimed to examine the processes, outcomes and challenges associated with the implementation of integrated PHRs in patients with heart failure (HF) or coronary artery disease (CAD).

Methods: This prospective single-group study evaluated the effects of a PHR system with the capability to capture electronic health records and vital signs in patients with HF or CAD.

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Article Synopsis
  • Researchers analyzed the characteristics and outcomes of 22,236 patients with myocardial infarction, focusing on the 286 diagnosed with non-obstructive coronary arteries (MINOCA) from the Japan Acute Myocardial Infarction Registry.
  • MINOCA patients were generally younger and had fewer risk factors compared to those with obstructive coronary artery disease (MI-CAD), but in-hospital mortality rates were similar between the two groups.
  • The study found higher non-cardiac mortality in MINOCA patients, especially among the elderly, indicating a need for better overall management and care for younger patients to improve their health outcomes.
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Myocardial infarction with non-obstructive coronary arteries (MINOCA) is a heterogeneous and diverse disease entity, which accounts for about 6 % of all acute myocardial infarction (AMI) cases. In patients with chest pain and acute myocardial injury detected by a highly sensitive troponin assay, the absence of epicardial coronary stenosis of 50 % or greater on angiography leads to the working diagnosis of MINOCA. The updated JCS/CVIT/JCC 2023 Guideline described MINOCA as a new disease concept and recommended a multimodality approach to uncovering the underlying causes of MINOCA.

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Background: Although a door-to-balloon (D2B) time ≤90 min is recognized as a key indicator of timely reperfusion for patients with ST-segment elevation myocardial infarction (STEMI), it is unclear whether regional disparities in the prognostic value of D2B remain in contemporary Japan.

Methods and results: We retrospectively analyzed 17,167 STEMI patients (mean [±SD] age 68±13 years, 77.6% male) undergoing primary percutaneous coronary intervention.

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Objectives: Delirium is an important prognostic factor in postoperative patients undergoing cardiovascular surgery and intervention, including transcatheter aortic valve implantation (TAVI). However, delirium after transcatheter aortic valve implantation (DAT) is difficult to predict and its pathophysiology is still unclear. We aimed to investigate whether preoperative cerebral blood flow (CBF) is associated with DAT and, if so, whether CBF measurement is useful for predicting DAT.

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Due to the coronavirus disease 2019 (COVID-19) pandemic, the first state of emergency had been declared from April 7 to May 25, 2020, in Japan. This pandemic might affect the management for patients with acute myocardial infarction (AMI). Method and Results: To evaluate the critical care and outcomes of AMI patients during the COVID-19 outbreak, we examined the patients with AMI hospitalized in 2020 (n = 1186) and those in 2017-2019 (n = 4877) using a database of the Miyagi AMI Registry Study.

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Objectives: Whether there are prognostic links between coronary morphologies and coronary functional abnormalities was examined in ischemia and nonobstructive coronary artery disease (INOCA) patients.

Background: Although INOCA has attracted much attention, little is known about the prognostic impact of coronary morphologies in this disorder.

Methods: A total of 329 consecutive INOCA patients were enrolled and underwent spasm provocation testing combined with lactate sampling for diagnosis of epicardial and microvascular spasm (MVS).

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BACKGROUND Stable coronary artery disease is caused by a variable combination of organic coronary stenosis and functional coronary abnormalities, such as coronary artery spasm. Thus, we examined the clinical importance of comorbid significant coronary stenosis and coronary spasm. METHODS AND RESULTS We enrolled 236 consecutive patients with suspected angina who underwent acetylcholine provocation testing for coronary spasm and fractional flow reserve (FFR) measurement.

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Aims: In vasospastic angina (VSA), coronary vasomotion abnormalities could develop not only in epicardial coronary arteries but also in coronary microvessels, where calcium channel blockers (CCBs) have limited efficacy. However, efficacy of exercise training for VSA remains to be elucidated. We thus aimed to examine whether vasodilator capacity of coronary microvessels is impaired in VSA patients, and if so, whether exercise exerts beneficial effects on the top of CCBs.

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Coronary spasm is an established cause for angina pectoris. Ethnic differences have been suggested among Asian compared to Caucasian patients regarding prevalence, gender distribution, and angiographic patterns of coronary spasm. The aim of this study was to compare contemporary German and Japanese patients with coronary spasm.

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Objective: It remains to be elucidated whether and how endothelial functions are impaired in peripheral circulation of patients with coronary functional disorders, such as vasospastic angina (VSA) and microvascular angina (MVA). We simultaneously examined endothelial functions of peripheral conduit and resistance arteries in patients with coronary functional disorders, with a special reference to NO and endothelium-dependent hyperpolarization factors. Approach and Results: Based on the results of invasive coronary acetylcholine testing and coronary physiological measurements, we divided 43 patients into 3 groups; VSA, MVA, and VSA+MVA.

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Background: Along with the global aging, the number of geriatric patients with acute myocardial infarction (AMI) has been increasing. However, temporal trends in the prevalence and outcomes of geriatric patients with AMI, with a special reference to heart failure (HF) on admission, remain to be elucidated.

Methods: The Miyagi AMI Registry is a prospective, multicenter, and observational study.

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Background: Approximately one-half of patients undergoing diagnostic coronary angiography for angina have no significant coronary stenosis, in whom coronary functional abnormalities could be involved.

Objectives: This study examined the significance of coronary functional abnormalities in a comprehensive manner for both epicardial and microvascular coronary arteries in patients with angina and nonobstructive coronary artery disease (CAD).

Methods: This study prospectively enrolled 187 consecutive patients (male/female 113/74, 63.

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Background: Intra-procedural myocardial ischemia as an iatrogenic complication still remains a critical issue in contemporary interventional cardiology. The aim of this study was to examine the usefulness of fasudil, a selective Rho-kinase inhibitor, for percutaneous coronary intervention (PCI)-related myocardial ischemia.

Methods: Among 448 PCI sessions performed between October 2015 and December 2017, we retrospectively examined 36 patients (69.

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An 83-year-old woman with severe aortic stenosis was admitted to our hospital due to heart failure with refractory anemia requiring blood transfusions. She had repetitive bleeding episodes from endoscopically proven angiodysplasia in the stomach. Moreover, she repeatedly underwent endoscopic argon plasma coagulation for hemostasis.

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Background: Complete revascularization with PCI is not always achieved in patients with ischemic HF. Therefore, this study aimed to elucidate the prognostic impact of residual coronary stenosis (RS) after percutaneous coronary intervention (PCI) in patients with ischemic heart failure (HF).

Methods: We analyzed a total of 1307 patients with symptomatic HF and a history of PCI registered in our Chronic Heart Failure Analysis and Registry in the Tohoku District-2 (CHART-2) Study.

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We have previously demonstrated that cardiac shock wave therapy (CSWT) effectively improves myocardial ischemia through coronary neovascularization both in a porcine model of chronic myocardial ischemia and in patients with refractory angina pectoris (AP). In this study, we further addressed the efficacy and safety of CSWT in a single-arm multicenter study approved as a highly advanced medical treatment by the Japanese Ministry of Health, Labour and Welfare. Fifty patients with refractory AP [mean age 70.

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Background: Recent studies suggested that perivascular components, such as perivascular adipose tissue (PVAT) and adventitial vasa vasorum (VV), play an important role as a source of various inflammatory mediators in cardiovascular disease.

Objectives: The authors tested their hypothesis that coronary artery spasm is associated with perivascular inflammation in patients with vasospastic angina (VSA) using F-fluorodeoxyglucose (F-FDG) positron emission tomography/computed tomography (PET/CT).

Methods: This study prospectively examined 27 consecutive VSA patients with acetylcholine-induced diffuse spasm in the left anterior descending artery (LAD) and 13 subjects with suspected angina but without organic coronary lesions or coronary spasm.

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Article Synopsis
  • Rho-kinase activity in circulating leucocytes is a significant biomarker for diagnosing and assessing the disease activity of vasospastic angina (VSA), with higher levels indicating worse prognosis.
  • In a study with 174 VSA patients followed for 16 months, 5.7% experienced cardiac events, predominantly affecting those with elevated Rho-kinase activity.
  • The combined use of Rho-kinase activity and the Japanese Coronary Spasm Association risk score enhances prognostic predictions for VSA patients.
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From August 26th to 30th, the 2017 Annual Congress of the European Society of Cardiology (ESC 2017) was held in Barcelona, Spain. Despite the terrorism tradegy just before the ESC congress, the congress attracted many medical professionals from all over the world to discuss the recent topics in cardiovascular medicine in more than 500 sessions, including COMPASS (Cardiovascular OutcoMes for People using Anticoagulation StrategieS Trial), CANTOS (Canakinumab Anti-Inflammatory Thrombosis Outcomes Study), and ORION (which assessed the effect of a novel siRNA inhibitor to PCSK9 on reductions in low-density lipoprotein cholesterol). Japanese cardiologists and the Japanese Circulation Society greatly contributed to the congress.

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Article Synopsis
  • The study investigates the effects of low-energy cardiac shockwave (SW) therapy on left ventricular (LV) remodeling in patients who have experienced an acute myocardial infarction (AMI) after undergoing primary percutaneous coronary intervention (PCI).
  • Seventeen patients were treated with SW therapy at various intervals post-AMI, and were compared to 25 historical control patients to evaluate the impact on LV function.
  • Results showed that the SW-treated group demonstrated significantly better LV function and size at 6 months post-AMI, suggesting that this therapy could effectively support recovery after heart attacks.
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Background: Myocardial bridge (MB) is a myocardial bundle through which coronary segment tunnels and could compress coronary arteries causing myocardial ischemia. However, the characteristic structural findings of MB remain to be fully elucidated. Recently, we demonstrated that optical coherence tomography (OCT) enables us to visualize adventitial vasa vasorum (VV) formation in humans.

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Objective: Drug-eluting stent-induced coronary hyperconstricting responses remain an important issue. The adventitia harbors a variety of components that potently modulate vascular tone, including sympathetic nerve fibers (SNF) and vasa vasorum. Catheter-based renal denervation (RDN) inhibits sympathetic nerve activity.

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Background: We are now facing rapid population aging in Japan, which will affect the actual situation of cardiovascular diseases. However, age-specific trends in the incidence and mortality of acute myocardial infarction (AMI) in Japan remain to be elucidated.Methods and Results:We enrolled a total of 27,220 AMI patients (male/female 19,818/7,402) in our Miyagi AMI Registry during the past 30 years.

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