If an electronic BP measurement is abnormal, what is the appropriate next step?

• A. Accept the reading
• B. Recheck the same device later
• C. Record and ignore
• D. Obtain a manual measurement

Answer: (D)

When a blood pressure reading from an electronic device seems abnormal, the next best step is to verify it with a manual auscultatory measurement using a calibrated sphygmomanometer and stethoscope. Automated devices can be unreliable due to factors like improper cuff size or placement, patient movement, recent activity, caffeine or nicotine use, or irregular heart rhythms. The manual method directly detects Korotkoff sounds and provides a measurement that isn’t affected by those same issues, making it the most dependable way to confirm an abnormal reading.

To perform the manual measurement, ensure the patient is seated with back supported, feet uncrossed and flat, and the arm supported at heart level. Use a cuff size appropriate for the arm; place the cuff snugly on bare skin around the upper arm, align with the brachial artery, and inflate to about 20–30 mm Hg above the point where the radial pulse disappears. Then deflate slowly while listening with a stethoscope over the brachial artery; note the first Korotkoff sound as systolic pressure and the disappearance of sound as diastolic pressure. Take at least two readings and average them.

If the manual reading confirms an abnormal value, document and proceed per protocol. If it differs from the electronic reading, use the manual result for clinical decisions and check the device for calibration or functional issues. If repeat manual readings remain abnormal, treat or escalate as indicated.