Question

In order to detect the QRS, the detection threshold is kept as ________ to prevent the detection of T waves or baseline noise as QRS complexes during a complete heart block or asystole.

(a) 0.15 V

(b) 0.015 mV

(c) 0.015 mV

(d) 0.00015 V

I have been asked this question in final exam.

Question is from Bedside Patient Monitoring System topic in section Patient Monitoring System of Biomedical Instrumentation

Answer 1

The correct answer is (d) 0.00015 V

For explanation I would say: In order to detect the QRS, the detection threshold is kept as 0.15 mV to prevent the detection of T waves or baseline noise as QRS complexes during a complete heart block or asystole. For optimal performance and to prevent false alarms, the lead selected for monitoring should have adequate amplitude.