Masimo Rad-8 User Manual

Rad-8 Signal Extraction Pulse Oximeter Operator’s Manual 4-5
4
operation
NUMERIC DISPLAY - PULSE RATE
The Pulse Rate displayed on the Rad-
8 Pulse Oximeter may differ slightly from the heart
rate displayed on ECG monitors due to differences in averaging times. There may also be a
discrepancy between cardiac electrical activity and peripheral arterial pulsation. Significant
differences may indicate a problem with the signal quality due to physiological changes
in the patient or one of the instruments or application of the sensor or patient cable. The
pulsations from intra-aortic balloon support can cause the pulse rate displayed on the
Rad-8 to be significantly different than the ECG heart rate.
NUMERIC DISPLAY - (PI)
The perfusion index (PI) bar graph indicator provides a relative numeric indication of the
pulse strength at the monitoring site. It is a calculated percentage between the pulsatile
signal and non-pulsatile signal of arterial blood moving through the site. PI may be used to
find the best perfused site and to monitor physiological changes in the patient. It displays an
operating range of 0.02 percent to 20.00 percent. A percentage greater than 1.00 percent
is desired. Extreme changes in the display number are due to motion artifact and changes
in physiology and blood flow.
LOW PERFUSION
The device indicates perfusion on a 10-bar LED indicator. The lower two segments of the
bar will turn red when the amplitude of the arterial pulsations is very low (low perfusion).
It has been suggested that at extremely low perfusion levels, pulse oximeters can measure
peripheral saturation, which may differ from central arterial saturation
1
. This “localized
hypoxemia” may result from the metabolic demands of other tissues extracting oxygen
proximal to the monitoring site under conditions of sustained peripheral hypoperfusion.
(This may occur even with a pulse rate that correlates with the ECG heart rate.)
CAUTION: IF THE LOW PERFUSION INDICATION IS FREQUENTLY DISPLAYED,
FIND A BETTER-PERFUSED MONITORING SITE. IN THE INTERIM,
ASSESS THE PATIENT AND, IF INDICATED, VERIFY OXYGENATION
STATUS THROUGH OTHER MEANS.
1
Severinghaus JW, Spellman MJ. pulse oximeter Failure Thresholds in Hypotension and
Vasoconstriction. Anesthesiology 1990; 73:532-537

Masimo Rad-8 Specifications

General

Display	LED
Pulse Rate Range	25-240 bpm
Pulse Rate Accuracy	±3 bpm
Trend Time	72 hours
SpO2 Range	0-100%
SpO2 Accuracy	± 2 digits (70-100% SpO2)
Power Supply	AC adapter or rechargeable battery
Perfusion Index (PI) Range	0.02% - 20%
PVI Range	0-100
Operating Temperature	5°C to 40°C (41°F to 104°F)
Storage Temperature	-4°F to 140°F (-20°C to 60°C)
Relative Humidity	10-95% non-condensing
Altitude	Up to 15, 000 ft (4, 572 m)