A&D AND TM-2657P Instruction Manual page 15

What is IHB (Irregular Heartbeat)?
When the monitor detects an irregular rhythm during the measurements, the I.H.B.
indicator will appear on the display with the measurement values.
Note
We recommend contacting your physician if you see this (
When is the IHB mark printed?
The IHB mark is printed in the measurement data in the following two cases.
● When a beat varies during measurement.
● When the arm or monitor is moved during measurement.
) I.H.B. symbol frequently.
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