1.

How many steps are there in QRS detection?(a) Three steps(b) Two steps(c) Four steps(d) One step

Answer» The correct answer is (b) Two steps

Easiest explanation: QRS detection is now almost universally performed digitally in a two-step process. The ECG is first preprocessed to enhance the QRS complex while suppressing noise, artifact and non-QRS portions of the ECG. The output of the preprocessor stage is subjected to a decision rule that confirms the detection of QRS if the processor output exceeds a threshold.


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