ZOLL M Series Defibrillator Rev G NIBP - Manual (Page 8)

N ON -I NVASIVE B LOOD P RESSURE (NIBP)
2 ZOLL M Series Operator’s Guide - Option Insert
How Does the NIBP Option Work?
The NIBP option uses the oscillometric method to measure arterial blood pressure and consists of the
following parts:
• Blood pressure cuff.
• Hose.
• Pump.
• Pressure sensor and signal processing electronics/software (inside the M Series unit).
When taking a measurement, the M Series unit performs the following cycle:
1. Cuff inflates to preset pressure, cutting off the flow of blood through the arteries in the monitored
limb.
2. Cuff deflates incrementally.
3. When the cuff pressure drops far enough, the blood flow in the patient’s arteries resumes.
4. Pressure oscillations caused by the restricted blood flow travel from the cuff, through the hose, and
to the M Series unit.
5. A sensor inside the M Series unit measures the pressure oscillations and calculates the
corresponding systolic, diastolic, mean blood pressure and pulse rate values.
6. Blood pressure values display on the screen.
This cycle takes approximately 30 seconds. If set to do so, the M Series unit repeats the cycle at a user-
selected interval.
If the sensor cannot detect systolic pressure, the M Series unit immediately increases the cuff inflation
pressure and completes the measurement. If the M Series unit finds a fault, it displays a corresponding
message on the screen. If after 180 seconds the M Series unit has not been able to determine systolic,
diastolic or mean pressure, it aborts the measurement and deflates the cuff.
When taking automatic interval measurements, the M Series unit does not start a new measurement
unless 30 seconds have elapsed since the end of the previously completed measurement cycle.