The nurse knows that which of the following observations of a client during a sleep study would be most likely considered a pathological finding?
A) The client experiences periods of apnea of 5 to 15 seconds in duration.
B) The client's intrinsic clock involves a sleep-wake cycle that is consistently 2 hours longer than the actual length of a day.
C) The client's PCO2 level is increased, and his PO2 level decreased during deep sleep.
D) The client spends the majority of his sleeping hours in deep REM sleep.
Ans:
D
Feedback:
While vital, REM sleep does not normally occupy the majority of sleeping hours. The brain is highly active during REM sleep, and it accounts for 20% to 25% of normal sleep. Brief apneic spells are not uncommon, and the circadian rhythm often does not match the 24-hour length of day. It is normal for PCO2 to increase and PO2 to decrease during deep sleep.
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