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相关概念视频

Myocarditis I: Introduction01:21

Myocarditis I: Introduction

341
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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Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

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Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
236
Rheumatic Heart Disease I: Introduction01:23

Rheumatic Heart Disease I: Introduction

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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
407
Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

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The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
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Mechanism of Cardiac Arrhythmias01:28

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Myocarditis III: Medical Management01:14

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Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
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相关实验视频

Updated: Jan 8, 2026

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天生的免疫激活和线粒体ROS诱导COVID-19后急性和持续的心脏导电系统功能障碍.

Deepthi Ashok1, Ting Liu1, Misato Nakanishi-Koakutsu2,3

  • 1Division of Cardiology, Department of Medicine, and.

JCI insight
|December 22, 2025
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概括

COVID-19通过间接的先天性免疫激活和氧化还原应激引起心律失常,而不是直接的病毒性心脏感染. 这种持续的心脏导电系统损伤可能解释了长期的COVID综合征症状.

关键词:
节律失常是一种失常.心脏病学 心脏病学免疫学 免疫学 免疫学传染性疾病传染性疾病.这是天生的免疫力.线粒体中的线粒体.

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科学领域:

  • 心脏病学 心脏病学
  • 免疫学 免疫学 免疫学
  • 病毒学 病毒学

背景情况:

  • 在急性SARS-CoV-2感染和长期COVID中,心律不整是常见的.
  • 与COVID-19相关的心律失常的潜在机制在很大程度上仍未知.

研究的目的:

  • 调查SARS-CoV-2感染对心脏电生理学和心脏导电系统 (CCS) 的急性和长期影响.
  • 阐明COVID-19影响心脏功能的间接机制.

主要方法:

  • 仓鼠感染了SARS-CoV-2,并记录了4周的心电图.
  • 评估了心脏基因表达,巨细胞透和细胞因子概况.
  • 通过使用polyyinosinic:polycytidylic acid (PIC) 注射来模拟天生的免疫激活.

主要成果:

  • SARS-CoV-2 感染引发了显著的心律失常,包括心和心房阻塞,心脏中没有可检测的病毒蛋白质.
  • 观察到持久的CCS损伤,其特征是细胞因子表达,连xin错位化和巨细胞重塑.
  • PIC注射模仿了COVID-19心律失常,突出了先天免疫激活的作用.
  • JAK/STAT抑制和线粒体抗氧化剂减轻了心脏影响,这表明先天免疫和氧化还原压力是关键调解者.

结论:

  • SARS-CoV-2 感染通过先天性免疫激活和氧化还原应激间接引起心律失常,导致持续的 CCS 损伤.
  • 这些发现提供了关于急性COVID-19和长期COVID综合征中心律失常的病理生理学的见解.