What action should be taken if the heart rate recorded by a pulse oximeter differs significantly from the actual heart rate?

If the heart rate recorded by a pulse oximeter differs significantly from the patient's actual heart rate, checking for poor perfusion is a critical action. Pulse oximeters estimate heart rate by detecting the pulsatile flow of blood through the peripheral tissues. If there is poor perfusion—caused by factors such as shock, vasoconstriction, or severe peripheral artery disease—the sensor may not receive a clear signal from the blood flow. This can lead to inaccurate heart rate readings. Therefore, assessing perfusion is essential to determine the reliability of the pulse oximeter reading and ensure patient safety.

In contrast, altering the pulse oximeter's volume settings, changing the type of sensor, or minimizing ambient light exposure may not address the underlying issue of poor circulation that affects pulse detection. These actions do not resolve the root cause of an inaccurate heart rate measurement and could still lead to misinterpretation of the patient's condition. Recognizing and addressing poor perfusion ensures that appropriate clinical responses are implemented based on accurate physiological data.