関連する実験動画
Updated: Sep 29, 2026
19:32
Preterm EEG: A Multimodal Neurophysiological Protocol
Published on: February 18, 2012
まとめ
身体表面電位マッピングは,乳児の心臓の電気活動の進化を明らかにします. 新生児は,右心室と左心室の脱極化パターンを明らかにし,9ヶ月までに成熟し,成人時の心臓の電気活動に似ています.
科学分野:
- 心臓病学 心臓病学
- バイオフィジックス 生物物理学
- 小児電気生理学について
背景:
- 幼児の心臓の電気的活動を理解することは,先天性心疾患の診断に不可欠です.
- 体表面電位マッピング (BSPM) は,心臓の電気活動を評価するための非侵襲的な方法を提供します.
研究 の 目的:
- 幼児期における心臓の電気活動の発達変化をBSPMを用いて調査する.
- 普通の乳児におけるQRSとST-T波のパターンの進化を特徴付けるために.
主な方法:
- 電気活動を記録するために150箇所の身体表面ポテンシャルマッピングシステムを利用しました.
- 31人の正常な乳児 (15時間から10ヶ月) の連続した身体表面マップを取得しました.
- 高時間解像度で記録されたデータ (QRSでは0.6 ms,ST-T波では2.4~4 ms).
主要な成果:
- 生後1年間,QRSとST-Tの波の地図の両方で秩序ある進行が観察されました.
- 新生児は,左心室の早期脱極化と右心室の長期的脱極化を示唆するパターンを示した.
- 9ヶ月の時点で,QRSパターンは,より年上の子供や成人のQRSパターンに似ており,成熟した心室活性化シーケンスを示しています.
結論:
- 乳児の心臓の電気活動は,人生の最初の1年間に,年齢に関係した顕著な成熟を経験します.
- BSPMは,心室の脱極化と再極化シーケンスにおけるダイナミックな変化を効果的に視覚化します.
- この発見は,乳児の心臓電気生理学に関する規範的基準を提供し,心室活性化シーケンスにおける年齢に関連する変化をサポートしています.
関連する概念動画
01:19Electrophysiology of Normal Cardiac Rhythm
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
01:29Electrocardiogram
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
01:25Correlation between ECG and Cardiac Cycle
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
01:27Development 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...
01:28Electrocardiogram Fundamentals
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
01:24ECG Interpretation of Rhythms
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...