Publications by authors named "Kenta Hachiya"

Article Synopsis
  • - A study on 367 patients undergoing ablation for paroxysmal atrial fibrillation (AF) compared outcomes between radiofrequency ablation (RFA) and cryoablation (CRA) to see how inducibility affects AF recurrence, following patients for 600 days.
  • - Results showed no significant difference in AF recurrence rates between the RFA (17%) and CRA (19%) groups, but inducibility through burst pacing (BP) was a strong predictor of recurrence in the RFA group, especially with low-frequency burst pacing (LFBP).
  • - In contrast, inducibility by BP after CRA did not predict recurrence, indicating that different ablation methods might yield different risks for returning AF.
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Aims: Higher left ventricular (LV) ejection fraction (EF) is related to unfavourable prognosis in patients with heart failure (HF) with preserved ejection fraction (HFpEF). The cause of this finding needs to be haemodynamically explained. Thus, we investigated this crucial issue from the perspective of LV-arterial (A) and right ventricular (RV)-pulmonary arterial (PA) coupling.

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Article Synopsis
  • The implementation of guideline-directed medical therapy for heart failure is low globally, prompting the development of a smartphone app to improve adherence.
  • This app is based on behavioral economics and aims to "nudge" both doctors and patients towards better treatment options.
  • Initial testing with 5 heart failure patients showed great usability and adherence, suggesting that further research with a larger group is warranted.
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Aims: Newly introduced drugs for heart failure (HF) have been reported to improve the prognosis of HF with preserved ejection fraction (HFpEF) in the lower range of left ventricular ejection fraction (LVEF). We hypothesized that a higher LVEF is related to an unfavourable prognosis in patients with HFpEF.

Methods And Results: We tested this hypothesis by analysing the data from a prospective multicentre cohort study in 255 patients admitted to the hospital due to decompensated HF (LVEF > 40% at discharge).

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Article Synopsis
  • - Spontaneous coronary artery rupture (SCAR) is a rare but serious condition that can be difficult to diagnose, as illustrated by a case involving a 70-year-old man who experienced sudden cardiac arrest.
  • - Initial emergency coronary angiography (CAG) did not show any abnormalities, but subsequent surgery revealed that pericardial fluid was due to bleeding from the left circumflex artery (LCx).
  • - A detailed review of the earlier CAG identified slight contrast leakage from the distal LCx, highlighting that SCAR should be considered in patients with unexplained pericardial effusion, and careful examination of CAG results is crucial.
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Risk stratification of normal-flow, low-gradient (NFLG) severe aortic stenosis (SAS) with preserved left ventricular (LV) ejection fraction (EF) remains unclear. Of 289 consecutive patients diagnosed with SAS by aortic valve area <1.0 cm, 66 with NFLG-SAS (stroke volume index >35 mL/m, mean pressure gradient <40 mmHg, LVEF ≥50%) were enrolled in this study; patients with bicuspid aortic valve, acute coronary syndrome, hemodialysis, or a history of aortic valve replacement (AVR) were excluded.

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We herein report an unusual case of an infected descending aortic pseudoaneurysm with luminal pathognomonic oscillating vegetation with serological findings and clinical features mimicking anti-proteinase 3-antineutrophil cytoplasmic antibody-associated vasculitis. The positive blood cultures and imaging findings, including a pseudoaneurysm and vegetations in the aorta, suggested the presence of an infected aortic aneurysm. The patient was successfully treated with antibiotics and endovascular aortic repair.

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A 53-year-old woman with systemic lupus erythematosus and antiphospholipid syndrome presented with central nervous system (CNS) lupus and vegetation of the mitral and aortic valves. Her CNS lupus was relieved with methylprednisolone pulse therapy; however, her mitral regurgitation worsened, and she developed acute decompensated heart failure. The mitral and aortic valves were replaced with mechanical heart valves.

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The present study tested the hypothesis that epicardial fat may be associated with augmented central aortic pressure and impaired left ventricular (LV) function. We studied 134 consecutive patients undergoing left-sided cardiac catheterization for coronary artery disease (CAD) and examined the relation of epicardial fat volume measured by multi-detector computed tomography to ascending aortic pressure and LV ejection fraction determined by cardiac catheterization as well as indices of LV diastolic function assessed by Doppler echocardiography [early diastolic mitral annular velocity (e') and a ratio of early diastolic mitral inflow to annular velocities (E/e')]. Epicardial fat volume indexed to body surface area correlated positively with age (r = 0.

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A 63-year-old woman had mistakenly drunk detergent stored in a plastic bottle and was transported to our hospital via ambulance due to unconsciousness. In the emergency room, the monitoring electrocardiogram showed complete atrioventricular block and temporary pacing was thus started. Left ventriculography indicated midventricular Takotsubo cardiomyopathy, although coronary angiograms showed a normal appearance.

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