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Each individual heartbeat is actually a collection of several muscle movements spurred into action by electrical impulses. The first electrical signal comes from the heart’s own natural pacemaker, the sinoatrial node, comprised of electrically..
By: Pankaj Nagpal
 
Sept. 10, 2009 - PRLog -- Dual Chamber In india


What is a pacemaker ?

Although it weighs just about an ounce, a pacemaker contains a powerful battery, electronic circuits and computer memory that together generate electronic signals. The signals, or pacing pulses, are carried along thin, insulated wires, or leads, to the heart muscle. The signals cause the heart muscle to begin the contractions that cause a heartbeat.

A pacemaker is implanted just below the collarbone in a procedure that takes about two hours. It is programmed to stimulate the heart at a pre-determined rate, and settings can be adjusted at any time. Routine evaluation, sometimes even via telephone, ensures the pacemaker is working properly and monitors battery life, which generally runs from five to ten years...



When is a pacemaker needed ?

The most common reason for a pacemaker is a heartbeat that slows to an unhealthy rate, or bradycardia. A pacemaker resets the heart rate to an appropriate pace, ensuring adequate blood and oxygen are delivered to the brain and other parts of the body...


Types of pacemakers

Three basic types exist to serve different purposes :

Single-Chamber Pacemakers : – In a single-chamber pacemaker, only one wire (pacing lead) is placed into a chamber of the heart. Sometimes it is the upper chamber, or atrium. Other times it is the lower chamber, or ventricle.

Dual-Chamber Pacemakers : – In dual chamber pacemakers, wires are placed in two chambers of the heart. One lead paces the atrium and one paces the ventricle. This approach more closely matches the natural pacing of the heart. This type of pacemaker can coordinate function between the atria and ventricles.

Rate-Responsive Pacemakers : – These have sensors that automatically adjust to changes in a person's physical activity.

Other devices : – Some devices, such as implantable cardioverter defibrillators (ICDs), designed primarily for other purposes, can function as pacemakers in certain situations.


When are pacemakers used ?

Pacemakers may be prescribed for a number of conditions, including : -

Bradycardia :  - A condition in which the heart beats too slowly, causing symptoms such as fatigue, dizziness or fainting spells. Bradycardia may be caused by the wear and tear of age or by conditions such as sick sinus syndrome (SSS) or heart block.

Atrial fibrillation :  - A common heart rhythm disorder in which the upper chambers of the heart beat rapidly and chaotically. Sometimes people with atrial fibrillation can also have slow rhythms. Medicines used to control atrial fibrillation may result in slow rhythms which are treated by pacemakers.

Heart failure :  - A condition in which the heartbeat is not sufficient to supply a normal volume of blood and oxygen to the brain and other parts of the body. A special pacemaker can be carefully programmed to increase the force of muscle contractions in the heart. This is called “biventricular pacing” or “resynchronization” therapy.

Syncope :  - A condition best known as the common faint, is usually not serious. Some patients faint when their heart rhythm becomes very slow. For a small percentage of people who experience severe and frequent fainting spells, a pacemaker may prevent the heart rate from slowing to the point of fainting.



Dual-Chamber Pacemakers Better for Heart Patients

MONDAY, Jan. 3 (HealthDayNews) -- Dual-chamber pacemakers may be more expensive than single-chamber models, but they're worth it because they reduce the risk of hospitalization and disability, a new study finds.

"Most people in the United States [who need an artificial pacemaker] receive dual-chamber pacemakers," said study co-author Dr. David J. Cohen, an associate professor of medicine at Harvard Medical School. But, he added, "The cost effectiveness of dual-chamber pacemakers had not been studied."

The findings appear in the Jan. 4 online issue of Circulation. For the study, Cohen and his colleagues used four years of data from 2,010 patients enrolled in a clinical trial who needed a pacemaker because of a condition called sick sinus syndrome, in which the sinus node -- the heart's "natural" pacemaker -- becomes defective. Then they projected the trial findings over a patient's lifetime...





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Source:Pankaj Nagpal
Email:***@indiahospitaltour.com
Zip:400103
Tags:Pacemaker Dual Chamber Surgery India, Pacemaker Implant India, Dual Chamber Surgery India, India Hospital Tour
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Location:Mumbai - Maharashtra - India
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Page Updated Last on: Apr 12, 2010
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