71210 Bioelectromagnetism - Exercises Autumn 2004

Distortion Factors in the ECG

1. Based on early work of Einthoven, Frank and Burger, what causes the most significant distortion in ECG?
   1. the lungs
   2. the thorax boundary
   3. intracardiac blood masses
   4. other internal inhomogenenities
2. As compared to homogeneous models, the Brody effect tends to direct lead vectors more
   1. radially
   2. tangentially
3. Hemodynamics, i.e. the cardiac function, alters the lead fields of even the most accurate ECG measurement system periodically
   1. False
   2. true
4. What is expected to happen to the magnitude of the ECG R-peak when the subject's fat percentage increases?
   1. No changes
   2. Significant increase
   3. Significant decrease

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