Service manual

mmHg. The
monitor then deflates the cuff, analyzes the stored data, updates the
front panel displays, and sounds a short audio tone.
16
DINAMAP’” PORTABLE ADULT/PEDIATRIC and NEONATAL VITAL SIGNS MONITOR OPERATION MANUAL
DETERMINATION
SEQUENCE
Continued
The monitor deflates the cuff one step each time it detects two
pulsations of relatively equal amplitude. Time between deflation steps
depends on the frequency of these matched pulses (pulse rate of
patient). However, if the monitor is unable to find any pulse within 1.6
seconds, it deflates to the next step. The process of finding two matched
pulses at each step provides rejection of artifact caused by patient
movement and greatly enhances the accuracy of the monitor.
I
TIME
I
Figure 4-l. Determination Sequence
At each step the microprocessor stores cuff pressure, the matched
pulse amplitude, and the time between successive pulses. The stepped
deflation and matched pulse detection continues until diastolic pressure
is determined or when total cuff pressure falls below 7