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Topic: Pacemaker potential


  
  ARRLWeb: Interference: Its Potential Effect on Pacemaker Systems
The presence of a cardiac pacemaker is considered a contraindication to extracorporeal electrohydraulic shock wave Lithotripsy, due to the possibility of electrical interference from the spark gap used to produce the shock waves, or damage to the pulse generator from the shock waves.
Potential effects may be due to either the radio frequency signal or the magnet within the phone and could include inhibition or asynchronous pacing when the phone is in close proximity (within 15 cm or 6 inches) to the pulse generator.
We suggest that pacemaker patients, particularly those who wish to continue working in potentially interference-rich environments, be counseled by their cardiologist on the effects of environmental interference and the likely response of their pacemaker system to the interference, as well as to the most effective ways of avoiding interference in their specific environment.
www.arrl.org /tis/info/pcmkr.html   (3165 words)

  
 Effect of isoprenaline, carbachol, and Cs+ on Na+ activity and pacemaker potential in rabbit SA node cells -- Choi et ...
Effect of isoprenaline, carbachol, and Cs+ on Na+ activity and pacemaker potential in rabbit SA node cells -- Choi et al.
decreased the slope of the pacemaker depolarization and thereby
distinct fusion of the pacemaker depolarization with the upstroke
ajpheart.physiology.org /cgi/content/full/276/1/H205   (4359 words)

  
 Cardiac pacemaker - Wikipedia, the free encyclopedia
Although all of the heart's cells possess the ability to generate these electrical impulses (or action potentials), a specialised portion of the heart, called the sinoatrial node, is responsible for the whole heart's beat.
The action potential generated by the SA node, passes down the cardiac conduction system, and arrives before the other cells have had a chance to generate their own spontaneous action potential.
As in all other cells, the resting potential of a pacemaker cell (-60mV to -70mV) is caused by a continuous outflow or "leak" of potassium ions through ion channel proteins in the membrane that surrounds the cells.
en.wikipedia.org /wiki/Cardiac_pacemaker   (1131 words)

  
 SIMPLIFIED INTERPRETATION OF THE PACEMAKER POTENTIAL AS A TOOL FOR TEACHING MEMBRANE POTENTIALS -- Kurbel 27 (3): 159 ...
be interpretation of the pacemaker potential generation in sinoatrial
Irisawa H, Brown HF, and Giles W. Cardiac pacemaking in the sinoatrial node.
Seyama I. Which ions are important for the maintenance of the resting membrane potential of the cells of the sinoatrial node of the rabbit?
advan.physiology.org /cgi/content/full/27/3/159   (682 words)

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