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What measurements are made vertically on electrocardiogram?

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What measurements are made vertically on electrocardiogram?

(a) Time Measurements

(b) Heart Rate Measurements

(c) Amplitude Measurements

(d) Time Measurements and Heart Rate Measurements

The question was asked in an online interview.

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

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Right answer is (c) Amplitude Measurements

Easy explanation: 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.

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