発達中のヒトの心臓における副心房心房筋結節: 周期の上心房心筋梗塞に対する関連性
Nathan D Hahurij1, Adriana C Gittenberger-De Groot, Denise P Kolditz
1Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, Netherlands.
Circulation
|May 29, 2008
まとめ
トランジッタリー・アクセサリー・アトリオベントリキュラー (AV) 筋脈連結は,発達中の人間の心臓に存在し,胎児および新生児のAV再侵入性心拍動脈を引き起こす可能性があります. これらのつながりは,出生前に徐々に消えていきます.
科学分野:
- 心血管の発達について
- 心臓電気生理学 心臓電気生理学
- 胎児心臓病科 胎児心臓病科
背景:
- 胎児および新生児の心房回転性心拍動症 (AV) は,重症であるが,通常は自己限定的な疾患である.
- 心臓発達の過程における一時的な補助的なAV筋動脈の接続が,これらの心拍の発作の原因であると仮定されている.
研究 の 目的:
- 副心房 (AV) 心筋接続の存在,位置,および発達タイムラインを調査する.
- 胎児および新生児の心律不整症におけるこれらの接続の潜在的な役割を理解する.
主な方法:
- 45人のヒトの胚,胎児,新生児の心臓 (4-36週間の妊娠期) の免疫ヒストキミカル分析.
- 補助的なAV心筋回路接続の定量化と分類.
- 発達中の AV 交差点と結節領域の3D 再構築.
主要な成果:
- 6~10週間の間には,主に左側,右側,および隔膜 AV 交差点で,アクセサリー AV 接続が豊富であった.
- 接続数は10〜20週から減少し,離散的な心筋筋鎖になりました.
- 大半の接続は右側 AV 交差点 (67%),特に横側 (45%) で,妊娠20週までに消失した.
結論:
- 心臓発達の過程で,心房心房 (AV) 結界は徐々に分離する.
- 右側付属AV心筋接続は,胎児の発達後期に一般的です.
- これらの一時的な接続は,胎児および新生児におけるAV再侵入性心拍動脈の基板として機能する可能性が高い.
関連する概念動画
Development of the Heart
The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart tube by...
Chambers of the Heart
The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...
Deoxygenated blood from the body is received in the right...
Conduction System of the Heart
Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
Conduction System of the Heart
The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
This system relies on the unique properties of nodal and Purkinje cells:...
Mechanism of Cardiac Arrhythmias
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.
Fetal Circulation
Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...


