Sat27November0556PM 21

Measured bioelectric potentials have an optimum bandwidth and typical frequency.

Which of the following bandwidth and voltage combinations is the most appropriate for a standard 12-lead ECG?

(Please select 1 option)

Bandwidth 0.5-50 Hz, voltage 0.5-10 millivolts

Bandwidth 0.05-100 Hz, voltage 0.5-10 millivolts Incorrect answer selected

Bandwidth 1-5000 Hz, voltage 10-200 microvolts

Bandwidth 1-50 Hz, voltage 10-200 microvolts

Bandwidth 0.05-150 Hz, voltage 100-4000 microvolts This is the correct answer

Explanation

Bioelectric signals have typical ranges of potential difference (amplitude) and bandwidth frequencies.

These are:

ECG - In monitoring mode, a bandwidth of 0.5-50 Hz is usually sufficient, however a typical diagnostic bandwidth is 0.05-150 Hz (up to 200 Hz) with a typical voltage range of 0.1-4 millivolts (100-4000 microvolts).

EEG - Frequency 0.5-100 Hz and voltage 0.5-100 microvolts.

EMG - Frequency 0.5-350 Hz and voltage 0.5 microvolts - 30 millivolts.

These small signals will need to be amplified and undergo further processing prior to display.

Answer Statistics

1

39%

2

27%

3

4%

4

17%

5

15%

Times answered: 257