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The primary purpose of a pacemaker is to maintain an even heart rate, either because the heart's natural cardiac pacemaker provides an inadequate or irregular heartbeat, or because there is a block in the heart's electrical conduction system. Modern pacemakers are externally programmable and allow a cardiologist to select the optimal pacing ...
An artificial cardiac pacemaker (or artificial pacemaker, so as not to be confused with the natural cardiac pacemaker) or just pacemaker is an implanted medical device that generates electrical impulses delivered by electrodes to the chambers of the heart either the upper atria, or lower ventricles to cause the targeted chambers to contract and ...
In pacemaker cells (e.g. sinoatrial node cells), however, the increase in membrane voltage is mainly due to activation of L-type calcium channels. These channels are also activated by an increase in voltage, however this time it is either due to the pacemaker potential (phase 4) or an oncoming action potential. The L-type calcium channels are ...
Pacemakers are also sometimes used to regulate the heartbeats in people with congenital heart disease, a group of conditions that affect about 1% of people born in the U.S., according to the ...
At the time of acquisition, Telectronics was number 2 in the worldwide pacemaker market. [10] [11] [12] In January 1995, Telectronics was forced to recall thousands of model 801 atrial "J" leads by the Food and Drug Administration leading to the company having to eventually settle legal claims at a cost of hundreds of millions of dollars. [13]
A week after a fainting spell, Netanyahu was urgently fitted with a pacemaker to control his heartbeat. Israeli doctors reveal Netanyahu's chronic heart problem only after implanting pacemaker ...
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If you're in the market for a new car, keep in mind that sticker prices don't include the cost of gas mileage -- or maintenance. Sometimes a set of wheels with a modest price tag can be among the ...
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