When cardiac muscle contraction is out-of-sync, causing chaotic contractions across the whole of the heart, preventing it from beating and pumping blood, this is called fibrillations. This typically happens when a myocardial infarction (blood clot leading to a heart attack) blocks blood to the coronary arteries, resulting in hypoxia to certain muscle cells. Then, after medical intervention, when the coronary arteries are unblocked and blood supply returns, some cardiac tissue beats out of sync with the rest of the heart, resulting in fibrillations. The usual treatment for this is the use of a defibrillator. This device sends a strong electrical signal into the heart, stopping it momentarily. Then, the brain can send a signal to the SA (sinoatrial) node of the heart to restart it again, so that the heart beats properly again.
The term for a delay or interruption in conduction of the electrical impulse in the myocardium is "heart block." Heart blocks can range from first-degree (mildest) to third-degree (most severe) based on the extent of conduction disruption in the heart's electrical system.
The structure that carries the heart's electrical impulse into the ventricles is called the bundle of His. It is a collection of specialized muscle fibers located in the walls of the heart's chambers that conducts the electrical signal from the atrioventricular node to the ventricles, initiating their contraction.
You can trace an impulse through the myocardium by using various techniques such as electrocardiography (ECG), which records the electrical activity of the heart. Another method is by using invasive procedures like cardiac catheterization or electrophysiological studies, which can directly measure electrical activity within the heart. These methods help to visualize the propagation of the impulse through different regions of the myocardium.
The apex beat or the point of maximum impulse (PMI), is the furthermost point outwards and downwards from the sternum at which the cardiac impulse can be felt. It beats because the heart is beating and that is the point at which the beat can be felt.
No, alternating current artifact is not part of the heart's electrical circuitry. It refers to interference or noise that can be picked up by an electrocardiogram (ECG) due to external electrical sources, such as power lines or nearby electronic devices. The heart's electrical circuitry consists of natural electrical signals and pathways within the body.
Cardiac Arrest.
an electrical impulse
It is the ability of the heart to send an electrical impulse on its own.
the skin
diastylic
The movement of electrical impulses in the heart coordinates the contraction of its chambers. The impulses initiate the contraction by stimulating the muscle cells, causing them to contract in a coordinated way. This results in the rhythmic pumping action that drives blood flow through the heart and to the rest of the body.
The AV node sends out an electrical impulse that causes the heart to contract.
heart block
The term for a delay or interruption in conduction of the electrical impulse in the myocardium is "heart block." Heart blocks can range from first-degree (mildest) to third-degree (most severe) based on the extent of conduction disruption in the heart's electrical system.
the heart rest and you can really thank God for that one
The vital force that keeps your heart beating is the electrical signals generated by the sinoatrial node, also known as the heart's natural pacemaker.
Sinoatrial, or SA node.