71210 Bioelectromagnetism - Exercises Autumn 2004

12-Lead ECG System: correct answers

1. Number of independent limb leads in the 12-lead system is
   1. 1
   2. 2
   3. 3
   4. 4
   5. 5
   6. 6
2. The heart behaves as a syncytium. It means that
   1. although the heart is composed of discrete cells, they are all closely connected and excitation proceeds from cell to cell
   2. the AV node is the only point of electrical contact between the atria and ventricles
   3. certain excitable cells are able to rhythmically generate their own action potentials
3. The major conducting pathway between the atria and the ventricles is
   1. the Purkinje fibers
   2. the bundle branches
   3. the AV node
   4. the AV bundle
4. AV-node delay is seen in the 12-lead signals as
   1. the T wave
   2. the delay between T wave and QRS complex
   3. the P wave
   4. the delay between P wave and QRS complex
5. Average potential of the extremities is also called
   1. Wilson′s central terminal
   2. standard ECG
   3. risk stratification

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