71210 Bioelectromagnetism - Exercises Autumn 2004

Cardiac Pacing

1. Which of the following conditions does not require pacing?
   1. III degree AV block
   2. Low ejection fraction
   3. A slow beat, an irregular rhythm
2. One has both atria and ventricle paced with a pacemaker sensing only ventricles and allowing inhibited function. The device has several programmable parameters but no antitachycardia features. What is the code of this pacemaker?
   1. DVIMO
   2. AVVIPN
   3. DVAMA
3. The site of pacing is not critically important because of the cell-to-cell activation mechanism
   1. True
   2. False
4. Stimulus threshold increases slowly after the implantation, because
   1. also lithium battery life is limited
   2. facilitation occurs in cardiac muscle cells
   3. the radii of the pacing electrode is increased over a long period of time

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