Pacemaker cells cardiac
Common Questions and Answers about Pacemaker cells cardiac
pacemaker
Hi, am doing some research. please can you explain why an 89yr old with pacemaker kept her 70bpm pulse with a fever of 40 deg.C. Also what were the metabolic implications for her? Many thanks.
Many cardiac muscle cells can contract spontaneously, but the cells in the Pacemaker region are, during fetal development, the fastest-beating ones, and the fastest ones normally dominate the whole show.
However, many of us have independent-minded cardiac cells that can trigger a contraction (a PVC) if they get the opportunity, and opportunity arises when the Pacemaker's rate slows down--as happens when you're cooling off after exercise, or when you're getting sleepy at bedtime.
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.
If the cells are dead, a cath would not be of any help. If the cells are hibernating due to low blood flow to the area, medication can increase the blood flow to the area....angina with stress and rest normal blood flow.
Your symptoms, if any, would be the issue to correct. If you are having chest pain (angina) with exertion and rest relieves the chest pain that would be stable angina and medication can be effective.
How is cardiac microvascular disease diagnosed since typical tests only show blockages to the major arteries?
This discussion is related to <a href="/posts/Heart-Disease/Pacemaker-Findings/show/718014">Pacemaker Findings</a>.
A related discussion, <a href="/posts/Heart-Disease/cardiac-microvascular-disease/show/1830551">cardiac microvascular disease</a> was started.
I volunteer in a hospital cardiac wing, and work with loved ones who have had heart related surgeries several days a week, and certainly, pacemaker insertions are very common. We get feedback from the patients about their care, etc., and I can't recall anyone who said they had problems other that a sore spot on the chest, but almost all people with pacemaker insertions report greater energy and a better quality of life. I also have a pacemaker, and am feeling great.
My father has had a pacemaker / defibulator for about 7 years. He recently had a heart attack. if his defib was working properly, should he have had a heart attack? His doctor just replaced his defibulator with a new one because it wasn't working. What I wanted to know is if the defib is controlling the heart function, why did he have an attack?
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.
hypokinesis can also be the result of stunned cells. Stunned heart cells affected by a heart attack can be revitalized if blood/oxygen is quickly provided within a few hours to the area affected by an acute heart attack.
Akinesis is different from hypokinesis in that the heart cells affected are necrotic (dead). Stem cell therapy may be helpful for that condition.
Five years ago I had hypokinesis of the left ventricle wall and a low EF.
The spread of electricity throughout the heart muscle is possible because all heart muscle cells, not just pacemaker cells, are excitable. 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.
Did they do a cardiac MRI or implant ICD as a precaution? My cardiac MRI was normal, they did a cardiac cath which showed no kinks, clots or blocks and I had to have a pacemaker/defibrillator implanted.
Did they give you any clues what caused yours? Mine were no known cause.
Hope you're feeling better now.
The spread of electricity throughout the heart muscle is possible because all heart muscle cells, not just pacemaker cells, are excitable. 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.
For example two people are dying or an infection, CPR and Defibrillation are applied in a cardiac emergency, but one patient is stabilized, while the other is not and dies.
I'm sort of looking for a more in depth explanation here, I'm guessing its got something to do with the chemistry in the heart or the nerves that control it? Thank you.
Often the heart cells are either non-functioning or have died and can not be revived. Damaged heart cells reduces the heart's ability to adequately pump blood into circulation because the damaged heart cells of the heart wall do not contract strongly.
Reduced contractility will not pump effectively enough to meet the system's demand for blood/oxygen would be worst scenario. To provide an EF calculation the echo estimates the volume of blood pumped with each heartbeat.
You have suffered a great injustice, and I'm sorry for your experience. I do not know what the black substance was, or what the results of exposure may be. However, the skipped beats may be caused simply by confusion in the heart muscle itself.
Your heart cells are all capable of contracting and causing the heart to beat. Usually, this job is segregated to specific cells that most people refer to as the "natrual pacemaker.
now have a pacemaker set for 60bpm. Medication is flecanaide with the idea of reducing the HR so the pacemaker controls the rate.
After 3 years being OK I am now getting rapid heart rate at night & sometimes during the day wirh a subsequent feeling of exhaustion. I also have light headed spells.
Should I be worried?
No abnormal cardiac event recorded during the episode and pacemaker has tracked good) Now it is suspected that it a kind of absence seizure and not stokes Adams attack. I am asked to consult neurologist tomorrow. If it is controlled by neurologist how should the pacemaker be programmed is my concern. As my son's heart has been tolerating it well for 7 months, and pacemaker has been no good in controlling syncope. Is 100% pacing required.
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