Final Answer:
The small watch device worn on the wrist of a sleep apnea patient to monitor rest and activity cycles is called Actigraphy. The correct answer is A.
Step-by-step explanation:
Actigraphy is the noninvasive method of monitoring rest and activity cycles by wearing a small watch device on the wrist. Actigraphy involves using a wrist-worn device that records movements to estimate sleep-wake patterns and circadian rhythms.
It's commonly utilized in sleep medicine to assess sleep disorders like sleep apnea. The device, similar to a wristwatch, contains an accelerometer to detect movements, providing data used to analyze sleep duration, efficiency, and patterns. This method is particularly useful for tracking sleep in a natural environment, offering insights into a patient's sleep habits over extended periods.
Actigraphy helps clinicians gather information about sleep quality and quantity, aiding in diagnosing sleep-related disorders like sleep apnea and determining the effectiveness of treatments or interventions. Therefore, the correct answer is A.