natus Xltek Trex HD, Руководство пользователя и обслуживания

Страница: 21 / 68

Xltek® Trex HD Amplifier User & Service Manual
20
A pulse oximeter should be considered an early warning device. As a trend towards patient
deoxygenation is indicated, blood samples should be analyzed by a laboratory co-oximeter
to completely understand the patient’s condition.
Significant levels of dysfunctional hemoglobins (HbCO or MetHb) may cause inaccurate
measurements.
Intravascular dyes such as indocyanine green or methylene blue may cause inaccurate
measurements.
Excessive illumination may cause inaccurate measurements or loss of pulse signal.
Excessive patient movement may cause inaccurate measurements.
Venous pulsations may cause inaccurate measurements.
Carboxyhemoglobin may erroneously increase readings. The level of increase is
approximately equal to the amount of carboxyhemoglobin present. Dyes, or any substance
containing dyes, that change usual arterial pigmentation may cause erroneous readings.
Loss of pulse signal can occur when the patient has hypotension, severe vasoconstriction,
severe anemia or hypothermia.
Loss of pulse signal can occur when there is arterial occlusion proximal to the sensor.
Loss of pulse signal can occur when the patient is in cardiac arrest or is in shock.
Do not immerse the sensor in water, solvents, or cleaning solutions. Do not sterilize the
sensor by irradiation, steam or ethylene oxide.
Do not immerse patient cables in water, solvents, or cleaning solutions (the patient cable
connectors are not waterproof). Do not sterilize patient cables by irradiation, steam or
ethylene oxide.
As with all medical equipment, carefully route cables and connections to minimize the
possibility of entanglement or strangulation.
Operation of this module below the minimum amplitude of 0.3% modulation may cause
inaccurate results.
Oximeter readings may be affected by the use of an electrosurgical unit (ESU).