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Cardiac pacemaker

Cardiac pacemaker

An electrical device which delivers a small stimulant shock to the heart to effect cardiac contraction at a pre-determined rate. Many of today's pacemakers have two main components: the electrodes and the transducer (pulse generator). The electrodes are wires which are placed into the circulatory system and make physical contact with the heart muscle. A small electrical discharge from the pacemaker electrode stimulates the muscular wall of the heart to contract, thus pumping blood in an organised fashion. The transducer is a small device, usually implanted under the skin, that generates the electrical discharge at a pre-determined frequency. Transducers can monitor your hearts rate of contraction and deliver an electrical shock only when the heart is going too slow.

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The Heart

... atria contract to fill them up again). The SA node's also known as the pacemaker since it sets the rate at which the whole system moves. (Incidentally ... a greater number of contractions would pump more, but this would be cardiac output rather than SV. 2. See above 3. Okay well the heartbeat is ...

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by Babybel56
Sat Apr 23, 2011 8:26 pm
Forum: Human Biology
Topic: The Heart
Replies: 6
Views: 8730

cardiac system

... sympathetic and parasympathetic nerve fibers. Under conditions of rest the parasympathetic fibers release acetylcholine, which acts to slow the pacemaker potential of the SA node and thus reduce heart rate. Under conditions of physical or emotional activity sympathetic nerve fibers release norepinephrine, ...

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by BioJunior
Sat Apr 23, 2011 9:18 am
Forum: Human Biology
Topic: cardiac system
Replies: 0
Views: 806

Poisoned by antibiotics...can anyone help?

... unexplained electrical disturbance in my heart causing this long term cardiac arrythmia and prolongation of the QT wave. I was told I may need a pacemaker and given Propranolol. After one week of treatment I was sent home. I was also diagnosed ...

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by Lesley998
Wed Oct 21, 2009 9:56 pm
Forum: Human Biology
Topic: Poisoned by antibiotics...can anyone help?
Replies: 23
Views: 66248

The Fiber Disease

... oh, that was: Experimental cardiac pacemaker powered by plutonium, ca. 1968 next: http://www.eh.doe.gov/ohre/roadmap/roadmap/photos/f54.gif ...

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by London
Wed Dec 20, 2006 6:43 am
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 4990339


... SA node or SAN, also called the sinus node) is the impulse generating (pacemaker) tissue located in the right atrium of the heart. It is a group ... near the entrance of the superior vena cava. These cells are modified cardiac myocytes. They possess some contractile filaments, though they do ...

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by dipjyoti
Wed Sep 27, 2006 7:03 am
Forum: Human Biology
Replies: 10
Views: 5598
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