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Topic: Electrical conduction system of the heart


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  World War 1 and 2 - Electrical conduction system of the heart   (Site not responding. Last check: 2007-10-21)
The normal electrical conduction in the heart allows the impulse that is generated by the SA node of the heart to be propagated to (and stimulate) the myocardium (muscle of the heart).
The conduction of the electrical impulse throughout the atria is seen on the EKG as the P wave.
Electrical activity that originates from the SA node at a rate of between 50 beats/minute and 100 beats/minute is known as normal sinus rhythm.
www.worldwardiary.com /history/Normal_sinus_rhythm   (414 words)

  
 Electrical conduction system of the heart   (Site not responding. Last check: 2007-10-21)
The normal electrical conduction in the heart allows the impulse that is generated by the SA node of the heart to be propogated to (andstimulate) the myocardium (muscle of the heart).
The conduction of the electrical impulse throughout the atria is seen onthe EKG as the P wave.
Electrical activity that originates from the SA node at a rate of between 50beats/minute and 100 beats/minute is known as normal sinus rhythm.
www.therfcc.org /electrical-conduction-system-of-the-heart-7932.html   (393 words)

  
 Online Games - Medical Terminology
Arrhythmias are caused by a disruption of the normal electrical conduction system of the heart.
There may be a problem in the heart muscle itself, causing it to respond differently to the signal, or causing the ventricles to contract independently of the normal conduction system.
Electrical "shock" (defibrillation or cardioversion), the implantation of a temporary pacemaker to interrupt the arrhythmia, or antiarrythmic drugs may be used.
www.sheppardsoftware.com /content/health/diseases/arrhythmia.htm   (389 words)

  
 The Heart's Electrical Activity and Conduction System   (Site not responding. Last check: 2007-10-21)
The conduction system of the heart begins in the sinoatrial (SA) node, a cluster of electricity-regulating cells that has been called the heart's "natural pacemaker." The cells of the sinoatrial node determine the frequency of the electric current, which in turn determines the rate of the heart's contractions.
The atrioventricular node is the "junction" between the atrial and ventricular chambers that conducts electricity.
The electric pathways of the AV node slow the flow of electricity from the atrial chambers to the ventricles.
www.heartdiseasefocus.com /electrocardiogram/heart-electrical-activity.php   (604 words)

  
 Rush Copley Adam Encyclopedia
The electrical impulse that signals the heart to contract in a synchronized manner begins in the sinoatrial node (SA node), which is the body's natural pacemaker.
The incidence of tachycardia and bradycardia varies greatly, depending on the condition of the heart itself, the history of prior heart attack, blood chemistry imbalance, or endocrine abnormalities.
Electrical "shock" (defibrillation or cardioversion), the implantation of a temporary pacemaker to interrupt the arrhythmia, or antiarrhythmic drugs may be used.
www.rushcopley.com /adam/Ency_Article.asp?GenContentID=001101   (735 words)

  
 Stanford Hospital And Clinics - Stanford University Medical Center - Anatomy and Function of the Heart's Electrical ...   (Site not responding. Last check: 2007-10-21)
An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node), which is a small mass of specialized tissue located in the right atrium (right upper chamber) of the heart.
The right and left atria (the two upper chambers of the heart) are stimulated first and contract a short period of time before the right and left ventricles (the two lower chambers of the heart).
The electrical impulse travels from the sinus node to the atrioventricular (AV) node, where it stops for a very short period, then continues down the conduction pathways via the bundle of His into the ventricles.
www.stanfordhospital.com /healthLib/atoz/cardiac/electric.html   (319 words)

  
 Heart conduction system
It records the electrical activity of the heart's two upper chambers (atria).The second and largest wave, the QRS wave, records the electrical activity of the heart's two lower chambers (ventricles).The third wave is the T wave.
Electrical impulses generated in the SAN cause the right and left atria to contract first.
Depolarization (heart muscle contraction caused by electrical stimulation) occurs nearly simultaneously in the right and left ventricles 1-2 tenths of a second after atrial depolarization.
your-doctor.com /healthinfocenter/medical-conditions/cardiovascular/conductiontutorial.html   (644 words)

  
 cardioweb - Electrical conduction system of the heart   (Site not responding. Last check: 2007-10-21)
The structure of the heart is highly specialised and quite different to normal muscle.
Muscle cells of the heart form a syncytium.
For the pumping efficiency of the heart to be maximised, the atria need to contract first, to ensure the maximum amount of blood is forced into the ventricles before these contract.
www.cardioweb.co.uk /ecg/ecgpage20.asp   (257 words)

  
 Electrical conduction system of the heart - Wikipedia, the free encyclopedia
The normal electrical conduction in the heart allows the impulse that is generated by the sinoatrial node (SA node) of the heart to be propagated to (and stimulate) the myocardium (muscle of the heart).
Under normal conditions, electrical activity is spontaneously generated by the SA node, the physiological pacemaker.
The conduction of the electrical impulse throughout the atria is seen on the ECG as the P wave.
en.wikipedia.org /wiki/Electrical_conduction_system_of_the_heart   (453 words)

  
 The Conduction System - Texas Heart Institute Heart Information Center
The SA node is sometimes called the heart's "natural pacemaker." When an electrical impulse is released from this natural pacemaker, it causes the atria to contract.
The SA node sends electrical impulses at a certain rate, but your heart rate may still change depending on physical demands, stress, or hormonal factors.
Leading With the Heart are members of the family of trademarks of the Texas Heart Institute.
www.tmc.edu /thi/conduct.html   (253 words)

  
 Bundle of His - Wikipedia, the free encyclopedia
The bundle of His is a collection of heart muscle cells specialized for electrical conduction that transmits the electrical impulses from the AV node (located between the atria and the ventricles) to the point of the apex of the fascicular branches.
They are an important part of the electrical conduction system of the heart as they transmit the impulse from the AV node (the ventricular pacemaker) to the rest of the heart.
It is extremely important for these nodes to exist as they ensure the correct control and co-ordination of the heart and cardiac cycle and make sure all the contractions remain within the correct sequence and in sync.
en.wikipedia.org /wiki/Bundle_of_His   (776 words)

  
 Heart Disease - 999 Heart Disease   (Site not responding. Last check: 2007-10-21)
Cardiology is the branch of medicine dealing with disorders of the heart and blood vessels.
The field is commonly divided in the branches of coronary artery disease, heart failure, valvular heart disease and electrophysiology.
International experts in lung cancer research will meet in Liverpool next week to discuss the development of early detection systems for the disease.
www.999heartdisease.com   (229 words)

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