Publications by authors named "Y Shiina"
Right ventricular (RV) dysfunction after biventricular repair is critical in most adults with congenital heart disease (ACHD). Conventional 2D magnetic resonance imaging (MRI) measurement is considered as a 'gold standard' for RV evaluation; however, addition information on ACHD after biventricular repair is sometimes required. The reasons why adjunctive information is required is as follows: (I) to evaluate the severity of cardiac burden in symptomatic patients with normal RV size and ejection fraction (EF), (II) to determine the optimal timing of invasive treatments in asymptomatic ones, and (III) to detect proactively a potential cardiac burden leading to ventricular deterioration, from a fluid dynamics perspective.
View Article and Find Full Text PDFTetralogy of Fallot (TOF) is a condition that often leads to long-term enlargement of the aortic root in after surgery. The aortic dilation is believed to be caused by histological abnormalities of the aortic media and the hemodynamic characteristics of increased aortic flow, compared to pulmonary flow. Severe cyanosis, severe right ventricular outflow tract (RVOT) obstruction, older age at repair, a larger aortic size at the time of repair, and a history of an aortopulmonary shunt parameters related to long-standing volume overload of the aortic root were the reported risk factors.
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- Advances in treatment have improved outcomes for pregnancies complicated by pulmonary arterial hypertension (PAH), but maternal mortality remains high compared to other cardiovascular issues.
- A review of six PAH-related maternal deaths from 2010 to 2022 revealed that most women were diagnosed with PAH after pregnancy, leading to delayed treatment.
- Right heart failure was the leading cause of death, emphasizing the critical need for early diagnosis and timely administration of pulmonary vasodilators for better maternal health outcomes.
Article Synopsis
- The study aims to evaluate right heart diastolic energy loss (EL) as a measure of cardiac workload and its links to major cardiac events (MACE) in adults with pulmonary atresia and an intact ventricular septum (PAIVS).
- Researchers compared 30 adult patients, including those with PAIVS and controls with pulmonary stenosis (PS), assessing factors like energy loss ratios, tricuspid regurgitation, and other cardiac metrics through MRI and echocardiography.
- Findings show that adults with PAIVS had a higher diastolic EL/cardiac output ratio and worse tricuspid regurgitation compared to PS patients; this ratio was also linked to MACE, indicating that even with
Severe aortic valve stenosis (AS) often coexists with mitral valve stenosis (MS). MS aggravation after transcatheter aortic valve replacement (TAVR) is common, and its etiology is multifactorial. We hypothesized that geometric changes in the mitral complex (mitral valvular and annular deformities) are adjunctive factors aggravating MS after TAVR, particularly in older adults with a smaller left ventricle (LV).
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