To use a pulse oximeter, apply the probe to the victim’s finger or any other measuring site, such as the earlobe or foot, according to the manufacturer’s recommendation. Let the machine register the oxygen saturation level and verify the victim’s pulse rate on the oximeter with the actual pulse of the victim. Monitor and record the victim’s saturation levels while administering emergency oxygen. If the oxygen level reaches 100 percent and local protocols allow, you may decrease the flow rate of oxygen and change to a lower-flowing delivery device.
Limitations
Some factors may reduce the reliability of the pulse oximetry reading, including:
■ Hypoperfusion, poor perfusion (shock).
■ Cardiac arrest (absent perfusion to fi ngers).
■ Excessive motion of the victim during the reading.
■ Fingernail polish (remove it using an acetone wipe).
■ Carbon monoxide poisoning (carbon monoxide saturates hemoglobin).
■ Hypothermia or other cold-related illness.
■ Sickle cell disease or anemia.
■ Cigarette smokers (due to carbon monoxide).
■ Edema (swelling).
■ Time lag in detection of respiratory insufficiency. (The pulse oximeter could warn too late of a decrease in respiratory function based on the amount of oxygen in circulation.)