Answer :
Inflate the cuff until the pulse disappears.
Only when there is a change in artery flow during a heartbeat can a Doppler instrument detect flow and emit sound. In order to occlude arterial blood flow during a Doppler blood pressure measurement, a cuff is inflated and then deflated until the flow resumes normally.
The Doppler probe can detect blood flow when the pressure in the cuff is slightly below the systolic blood pressure. With the help of the Doppler's noises, heart rate may be estimated. One of the typical side effects of anesthesia is hypotension.
Every patient should utilize non-invasive blood pressure monitoring since it is simple to set up and takes little time. If the amount of sedation permits, blood pressure monitoring may be started prior to induction.
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