This should show the Electrical Activity of the Heart, and whether or not the SA Node is functioning. In the absence of a normal SA Node, or at least a normally functioning one, an External Pacemaker may be needed to maintain the rate sufficiently.
Also, the Vagal Nerve acts on the SA Node, causing the heart to slow after the Fight or Flight reflex, and can, at times, be too profound in its effect on the SA Node.
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.
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.
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.
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.
In order to keep the heart rate sufficently fast, Doctors sometimes need to implant a Pacemaker that will discharge only when the SA Node fails to fire. This type of Pacemaker monitors the heart, and if the SA Node goes too long without firing, the Implanted Pacemaker will discharge, therefore keeping the heart rate fast enough. If the SA Node works as expected, the Implanted Pacemaker does not do anything, just monitors.
If you have had your AV and SA Nodes ablated and you are now 100% Pacemaker dependent.
an overzealous SA node, 2). another focus that takes over for some reason and overrides the sa node and/or 3). a reentry circuit. I have 1 and/or 2 but not the third.
Does anyone know for sure if the SA node is capable of firing at 60 and then jumping to 120ish for a run of beats? And do you know why this happens?
Secondly, does anyone know why a second focus starts to override the SA node?
Does anyone have input on SA node dysfunction?
s natural pacemaker), the AV Node (discharges in reaction to the SA Node Discharge or can Discharge Spontaneously if the SA Node fails to discharge in time.
In addition they provide a list of things that can cause Bradycardia that are not related to the heart structure itself.
I spent some time looking at the T-Wave question. It can be a normal finding in several leads, I could not find the link to the site that I feel explained it best.
The pulse rate is hovering around 30 beats per second. After doing research, I found that her SA and AV node could have failed. My question is, can temporary pacemaker and drugs treatment can recover SA and AV nodes. Or Permanent Pacemaker is the only option. If the permanent pacemaker is not fitted, what will her health status in near future. Please give your suggestions ASAP because I am undergoing a lot of stress and pain.
For a perspective, electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's "natural pacemaker."
The SA node sends electrical impulses at a certain rate, but your heart rate may still be altered by physical demands, stress, or other factors.
s natural pacemaker. The SA node discharges, the atrium contracts, the signal goes to the AV node, causing it to discharge, which causes the ventricles to contract. If the SA node doesn't discharge when it's supposed to, the AV node will eventually discharge on its own, but the rate will be much lower. This would be easy to see on an EKG, so that's likely the cause.
Has anyone suggested a Demand Pacemaker to kerp the heart rate above a certain point?
These vessels are responsible for feeding the right atrium and most critically the sa node. A block in the sa nodal artery, or an acute block further upstream can be devastating as this sa node is the piece of tissue that functions as the primary pacemaker (electrical ticker if you will) of the heart. This is the first reason of many as to why heart attacks that occur on the right side are so complex and concerning.
The surgery was accompanied with a maze procedure to normalize the heart beat rate to normal. However, after the surgery she has still been kept on pacemaker as cardiologists said her heart rate is still on 48-55 per minute (which is quite slow). The cardiologists have suggested that if the heart rate does not return back to normal a permanent pacemaker maybe required. Can anyone please suggest whether to wait for the heart beat to be back to normal or go for the pacemaker.
I am a 51 year old male, who had a CABG X6 (6 bypasses) two and a half years ago. My cardiologist and an arrythmia specialist are advising me that I need to have a pacemaker implanted b/c of a defective SA node. I am 6', 180 lbs, have never been overweight, don't drink or smoke, like to run, hit a boxing heavybag, and work out with weights. Which pacemakers should I consider?
SA node is a group of modified cardiac cells that have an intrinsic beat...the major pathways throughout the heart that distribute the actin potential for the contractions of the heart is via modified cardiac cells - Purkinje fibers - all of this is under the modification of the ANS, the autonomic nervous system, and hormones such as adrenalin.
previous answer to one of your questions is added below -
http://www.medhelp.
When I had my AV Node ablation in July I had a two-lead pacemaker implanted. Since then, I have chronic A-Fib. Sometimes I feel the procedure done me more harm than good. I still take flecainide 100 mg. It does not stop the A-Fib, but I cannot manage without it because of symptoms. The top lead has been turned off. I understand the electrical signal begins from the SA Node, and when the rt.
This answer was something I've posted before, so I cut an pasted it into this thread. Hope you don't mind the "repeat."
Every cell in your heart has the capability of initiating a contraction. Most don't, and that "chore" is relegated to the SA node or your "natural pacemaker.
I do not believe a pacemaker in-and-of-itself can cause a change in personality. However, the fact that one needs a pacemaker may be depressing emotionally and also cause anxiety. I am only 75 (compared to 91) and I know dealing with aging is difficult at best... I men when one feels "good" as can be expected (of course less than desired).
You may want to try a post on Senior Health or on Anxiety.
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