Question

What is sensitivity of an electrocardiograph?

(a) 10 mm/mV

(b) 15 mm/mV

(c) 20 mm/mV

(d) 25 mm/mV

I have been asked this question in an international level competition.

The question is from System Concepts topic in chapter Patient Monitoring System of Biomedical Instrumentation

Answer 1

Right answer is (a) 10 mm/mV

To explain: Electrocardiograms are almost invariably recorded on graph paper with horizontal and vertical lines at 1 mm intervals with a thicker line at 5 mm intervals. Time measurements and heart rate measurements are made horizontally on the electrocardiogram. Amplitude measurements are made vertically in millivolts. The sensitivity of an electrocardiograph is typically set at 10 mm/mV.