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2. Cardiac pacemaker - Wikipedia

   en.wikipedia.org/wiki/Cardiac_pacemaker

   It employs pacemaker cells that produce electrical impulses, known as cardiac action potentials, which control the rate of contraction of the cardiac muscle, that is, the heart rate. In most humans, these cells are concentrated in the sinoatrial (SA) node, the primary pacemaker, which regulates the heart’s sinus rhythm.

3. Pacemaker - Wikipedia

   en.wikipedia.org/wiki/Pacemaker

   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 ...

4. Pacemaker potential - Wikipedia

   en.wikipedia.org/wiki/Pacemaker_potential

   In a healthy sinoatrial node (SAN, a complex tissue within the right atrium containing pacemaker cells that normally determine the intrinsic firing rate for the entire heart [3] [4]), the pacemaker potential is the main determinant of the heart rate. Because the pacemaker potential represents the non-contracting time between heart beats , it is ...

5. Cardiac action potential - Wikipedia

   en.wikipedia.org/wiki/Cardiac_action_potential

   Pacemaker activity of these cells is vital, as it means that if the SAN were to fail, then the heart could continue to beat, albeit at a lower rate (AVN= 40-60 beats per minute, Purkinje fibres = 20-40 beats per minute). These pacemakers will keep a patient alive until the emergency team arrives. [citation needed]

6. Cardiac conduction system - Wikipedia

   en.wikipedia.org/wiki/Cardiac_conduction_system

   An impulse (action potential) that originates from the SA node at a relative rate of 60–100 bpm is known as a normal sinus rhythm. If SA nodal impulses occur at a rate less than 60 bpm, the heart rhythm is known as sinus bradycardia. If SA nodal impulses occur at a rate exceeding 100 bpm, the consequent rapid heart rate is sinus tachycardia ...

7. Arnold Schwarzenegger just got a pacemaker. Here's what to ...

   www.aol.com/lifestyle/arnold-schwarzenegger-just...

   Pacemakers, like the one Arnold Schwarzenegger recently had implanted, help regulate a patient's heartbeat. ... “The idea behind the pacemaker is to help stimulate the heart in a more regular ...

8. Transcutaneous pacing - Wikipedia

   en.wikipedia.org/wiki/Transcutaneous_pacing

   Normal heart rate varies substantially between individuals, and many athletes in particular have a relatively slow resting heart rate. [2] In addition, the heart rate is known to naturally slow with age. It is only when bradycardia presents with signs and symptoms of shock that it requires emergency treatment with transcutaneous pacing. False ...

9. Norway's King Harald gets pacemaker to boost heart rate - AOL

   www.aol.com/news/norways-king-harald-gets...

   OSLO (Reuters) -Norway's King Harald received a pacemaker implant on Tuesday in a scheduled operation to help compensate for a low heart rate, the royal court said. The 87-year-old was ...