pacemaker cells in the sinoatrial node

The sinoatrial node (SA node) is a group of cells positioned on the wall of the right atrium, near the entrance of the superior vena cava. Cells in the SA node will naturally discharge at about 70-80 times per minute. Because the sinoatrial node is responsible for the rest of the heart's electrical activity, it is sometimes called the primary pacemaker, the natural pacemaker.

Yes, the condition can infect the heart's natural pacemaker. The heart's "natural" pacemaker is called the sinoatrial (SA) node or sinus node. It's a small mass of specialized cells in the top of the heart's right atrium (upper chamber). It makes the electrical impulses that cause your heart to beat.

Nerves don't make the heart beat. Cardiac muscle cells are the pacemakers. There's a primary group in the atria called the sinoatrial (SA) node. this fires the atria. the discharge then travels to the atrioventricular (AV) node which fires the ventricles. What they are probably talking about is either ablating (destroying) the SA node or AV node. Both are different and require different types of pacing.

What was the reason for the defective sinoatrial node -- was it related to the surgical procedure? Did you have to travel after leaving the hospital, and if so, was that difficult for you? Please keep us posted on how you are feeling.

This allows the pacemaker cells within the SA node to be in control of generating and pacing the heartbeat. But, if a particular group of cells in areas remote from the SA node become extra- or hyper-excitable they can take over as the pacemaker for one or several beats, or for a longer term. You might think of the heart's cells as a schoolyard full of young boys playing soccer. Some are inherently quick and fast and are always on top of the game, while others usually play a little slower.

Usually, the heart muscle cells keep time more slowly than normal pacemaker cells. This allows the pacemaker cells within the SA node to be in control of generating and pacing the heartbeat. But, if a particular group of cells in areas remote from the SA node become extra- or hyper-excitable they can take over as the pacemaker for one or several beats, or for a longer term. You might think of the heart's cells as a schoolyard full of young boys playing soccer.

Hello, sinus tachycardia is a heart rhythm in which the rate of impulses coming from the pacemaker of the heart (the sinoatrial node) is elevated (>100 bpm in adult population). Several factors may be responsible of a persistent sinus tachycardia in a structurally normal heart, but some of the most common are: hyperthyroidism (increased activity of the thyroid gland), anemia, anxiety/stress, and chronic infections/fever.

Potentially something wrong with your lungs (pulmonary disease). When you look at an EKG, you have different waves: P (first bump), QRS (the different parts of the highest peaking wave), and T waves (right after the QRS). Right before the P wave happens, the atria contract due to the sinoatrial node ("pacemaker") in your heart, which is a bundle of nerves stimulating the heart to beat. It's potentially something going on with that as well.

Hi the SA Node had a 40% blockage built up inside it and this was causing the SA Node to start having some form of spasms/seizures lasting approximatley a couple of minutes, during these spasm/seizures my heart rate would drop to 31bpm because not enough blood was being pumped into my heart during the spasm/seizure and as soon as the spasm/seizure would end my heart rate went back up to normal rate, this was causing me to collapse on each occassion and other symptoms which is why they fitted the

I went to Sick Kids hospital in Toronto and they used amiodarone w- which was in trial at the time to knock the other SA node out.

The following excerpt was taken from an article that was copied from this web address: http://www.healthandage.com/Home/gid2=2089 This has to be one of THE BEST descriptions of the causes of arrhythmia I have EVER SEEN. For all of you who are trying to understand what is going on in there, here it is!!! Kudos to the author!!!!! Your Heart's Clock Regulates Its Rhythm - Part XIV Ed G.

What is your heart rate on average when you are resting? The Sinoatrial node is a group of cells on your heart which acts like a pacemaker, timing the heartbeats. This is where your problem is probably coming from. If you feel no symptoms then I doubt if the Doctors will do anything. You are still quite young, maybe it will just sort itself out with age. Infants have a heart rate on average 110-150 but slows down with age. Yours may do the same.

A very fast heart rate does not provide enough time for the heart's chamber to adequately fill and as a consequence the system may not get enough blood/oxygen and that includes the heart. Ischemia (lack of blood flow) to the heart cells can/will impair contractions leading to heart failure. Also a heart rate sustained above 100 bpm at rest stresses the heart and can cause heart enlargement and impair contractions resulting in heart failure and it can cause arrhythmia (irregular beats).

The sinus node in the left atrium is the source for your heart's pace. If it is a problem, a an independant pacemaker can be implanted. Normal heart rate is 60 to 100 at rest. There are normal pathways that an electrical impulse follows to contract the chamber walls, etc. Sometimes there are extra pathways that the electrical impulse abnormally may follow and that can disrupt normal heartbeats and cause arrhythmia (irregular beats).

QUOTE: " I remember that the docs telling me in the past that he has a murmur, but to keep an eye on it. A few days ago my doc said he has a grade 3/6 over the 2nd intercoastal on rt. side". Heard with a stethoscope and the intensity of a murmur is graded on a scale of 1-6 (or 1-5). Each grade should be given in relation to the range used (e.g. grade 3/6). The grades are: Grade 1: A quiet murmur that can be heard only after careful auscultation over a localized area.

The sinus atrial node is a clump of cells in your heart that put out an electrical current that causes the rest of your cells in the atrial center of your heart to contract. The electrical current continues into the ventricular node and causes the bottom of the heart to contract immediately after that.

So, in theory, yes an object buried in the av node, could sufficiently damage the cells and destroy the function of the av node.

(They can originate in the SA node, the atria, or in another node, the AV node, that transmits the signals from the upper heart chambers to the lower heart chambers.) It is less common for thyroid disease/meds to cause ventricular dysrhythmias, but it can happen. PVCs can also occur in NORMAL, HEALTHY PEOPLE WITH NORMAL, HEALTHY HEARTS.

The SA Node, really a grouping of cells in the Atrial Area of the Heart, are responsible for controlling the Heart Rate. If the SA Node fails to function, the AV Node, between the Atria and Ventricles, will discharge and maintain the heart rate, although much slower then the SA Node Rate. A viruses have been known to attack the heart, I have a friend so afflicted.

The normal regular rhythm of the heart set by the natural pacemaker of the heart called the sinoatrial (or sinus) node, hence the sinus rhythm. Hope this helped and do keep us posted.

Your relative is very misinformed. Any cell in the heart can initiate the heart beat. It just so happens that a group of cells in the atrium have the fastest internal clocks to "twitch" and that's what regulates the heart rate. These cells are called the sinoatrial node or SA node. The SA node naturally beats at about 100 BPM. What slows it down? The central nervous system slows it down.

The normal regular rhythm of the heart set by the natural pacemaker of the heart called the sinoatrial (or sinus) node. Sinus tachycardia can occur with anemia, anxiety, hyperthyroidism, fever and dehydration. It may not be related to a cardiac disorder. It can be aggravated by exercise, fever, excessive alcohol consumption and smoking. So, please don't worry and discuss the possibilities with your consulting doctor. Hope this helped and do keep us posted.

d like to know what got the ventricles going again. My understanding is that the pacemaker cells in the Ventricles can take over in the event it doesn't receive a signal to beat. this is called an "escape beat". On you holter they should be able to tell if the ventricles fired an escape beat or if the next beat was something called "normal sinus rhythm" or NSR. usually the ventricles will fire an escape beat within 3-4 seconds of not getting NSR.

Well that *****, I've had bouts like that. Some call this condition PVC storms, or clusters. These things in a structurally normal heart are considered benign. Our heart beats are regulated by the sinoatrial node (SA node), usually. It's located in the right atrium. The SA node is made of cells similar to the rest of the heart muscle, but they do not contract.

The SA node causes the atria to contract. As they contract the signal reaches the AV node which then fires the ventricles. The AV node doesn't generate a separate signal. If the atria and ventricles contract at the same time the heart would be very inefficient. This controlling mechanism keeps their contractions in rhythm. An ICD is needed when the ventricles have rhythm disturbances that occur in the ventricles that is leading to vtach which can turn into vfib.

Paroxysmal supraventricular tachycardia (PSVT) can be initiated in the SA node; in the atria or the atrial conduction pathways; or in the AV node. It occurs most often in young people and infants. Risks include smoking, caffeine, alcohol use, and illicit drug use. PSVT can occur with digitalis toxicity. It can be a form of a re-entry tachycardia (an electrical current is caught in a reentrant loop, excessively stimulating the heart), as in the case of Wolff-Parkinson-White syndrome.

Pacemaker cells in the sinoatrial node

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