Question

How many heart beat one can observe in a single sweep period?

(a) 1

(b) 2

(c) 3

(d) 4

The question was posed to me in an interview for job.

The question is from Arrhythmias Monitor in section Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation

Answer 1

The correct option is (d) 4

Best explanation: Without a long persistence screen, one can only see a moving dot of light instead of a continuous trace. Typically for a 13-cm screen, total sweep time is usually kept as 2.5 or 5 s. In this way, one can observe at least four heart beats in a single sweep period.