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相关概念视频

Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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相关实验视频

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在全身性硬化症中左心室肌肉的特征

Briella K Egberts1,2,3, Rajiv Ananthakrishna1,2,3,4,5, Ranjit Shah1,2,3

  • 1College of Medicine and Public Health, Flinders University, Bedford Park 5042, Australia.

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概括

没有心脏病的全身性硬化患者表现出亚临床左心室缺血和对压力的氧化反应受损. 这表明早期冠状动脉微血管功能障碍和纤维化有助于心血管风险.

关键词:
主性心脏干扰心脏磁共振成像冠状动脉微血管功能障碍缺血症左心室氧气敏感的心脏磁共振成像系统性硬化症胸前心声检查

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科学领域:

  • 心脏病学
  • 放射学
  • 关节病学

背景情况:

  • 在全身性硬化 (SSc) 中心脏参与很常见,但左心室 (LV) 缺血机制尚不清楚.
  • 肺动脉高血压 (PAH) 已被确认,但需要进一步调查.
  • 氧气敏感心血管磁共振 (OS-CMR) 为心肌氧化和缺血提供了新的见解.

研究的目的:

  • 在没有已知的心脏疾病的SSc患者中使用LVOS-CMR评估心肌脱氧变化.
  • 使用先进的CMR技术评估SSc中的亚临床心脏参与.
  • 在SSc中调查早期冠状动脉微血管功能障碍和LV心肌纤维化.

主要方法:

  • 预期招募SSc患者和年龄/性别匹配的健康志愿者 (HV).
  • 综合性心血管磁共振 (CMR) 包括原生T1映射,休息/压力OS-CMR,压力输液和晚期加多增强 (LGE).
  • 通过胸腔回声扫描 (TTE) 来评估心脏功能.

主要成果:

  • 与HV患者相比,SSc患者的全球LVOS- CMR信号强度显著降低 (p=0. 011).
  • 在SSc患者中,至少有一部分患者表现出心肌氧化反应受损 (OS- CMR SI变化≤10%).
  • 在SSc患者中观察到减少的LV全球纵向应变 (p=0. 045) 和扩散性纤维化 (T1映射异常78%) 的证据.

结论:

  • 没有已知的心血管疾病或PAH的SSc患者表现出亚临床LV缺血和压力诱导的心肌氧化受损.
  • 与对照组相比,SSc患者存在LV心肌变形异常和扩散纤维化.
  • 结果表明早期冠状动脉微血管功能障碍和LV纤维化有助于SSc的心血管风险,独立于PAH.