Question

What is the frequency range of Chest-wall movements?

(a) 0.025 to 0.05 Hz

(b) 0.05 to 0.1 Hz

(c) 0.1 to 20 Hz

(d) 20 to 100 Hz

This question was addressed to me in an interview for internship.

This intriguing question originated from Catheterization Laboratory Instrumentation in portion Patient Monitoring System of Biomedical Instrumentation

Answer 1

Right choice is (c) 0.1 to 20 Hz

The best explanation: An apexcardiograph records the chest-wall movements over the apex of the heart. These movements are in the form of vibrations having a frequency range of 0.1 to about 20 Hz.