A client is being monitored with pulse oximetry. On review of the foll

A client is being monitored with pulse oximetry. On review of the following factors, the nurse suspects that the values will be influenced by:

1. The placement of the sensor on the extremity
2. A diagnosis of peripheral vascular disease
3. A reduced amount of artificial light in the room
4. The increased ambient temperature of the client’s room

ANSWER

ANS: 2
Peripheral vascular disease can reduce pulse volume, which may affect the pulse oximetry read-ing. The sensor should be placed on an extremity site (such as an earlobe or digit) with adequate local circulation and the site should be free of moisture. Reduced light in the room will not affect the oximetry reading. Outside light sources can interfere with the oximeter’s ability to process reflected light. An increased temperature of the room will not affect the oximetry reading. If the room was very cold, the client’s peripheral blood flow may decrease, affecting the oximetry reading.