1|Page
NBRC SDS EXAM 2 NEWEST 2025 ACTUAL EXAM|
COMPLETE 170 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+| SDS NBRC EXAM 2025
(BRAND NEW!!)
List 3 items that must be scored for MSLT - ANSWER - 1. Sleep
latencies for each nap
2. MSLT for the entire test (avg of ALL naps)
3. SOREM periods
Correct position for and esophageal pH monitoring catheter is... -
ANSWER - advance catheter until pH< 4.0 and then withdraw 5cm, tape
and record tube placement at nostril
Describe the anatomic position an esophageal pH catheter should be
placed - ANSWER - Cather tip should be 5cm above the upper border of
the lower esophageal sphincter
An ECG tracing shows a beat with an irregular rhythm, QRS >0.12sec,
and a varying rate. The sleep tech would classify this as - ANSWER -
PVC
Normal QRS interval is - ANSWER - 0.04 - 0.10sec (No bigger than 2.5
tiny boxes)
pg. 1
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Normal PR interval is - ANSWER - 0.12-0.20 sec (No bigger than 1
large box)
Formula for calculating Hr on ECG tracing - ANSWER - 300 % # of
large boxes between R waves
A pt is noted to have EDS but no REM onset. The pt has indicated she
sometimes sleeps 14 hours per day. The sleep tech would classify this
situation as - ANSWER - Idiopathic insomnia
This dyssomnia presents as EDS but without sleep onset REM or
cataplexy - ANSWER - Idiopathic Hypersomnia (Primary Hypersomnia)
List two types of Recurrent Hypersomnia - ANSWER - 1. Klein Levin
2. Menstrual Related
This type of Recurrent Hypersomnia presents with odd behaviors such
as binge eating, hypersexuality and confusion) ...more common in men -
ANSWER - Klein Levin syndrome
(Low volt slow wave EEG)
A sleep tech notices that the ECG channel shows a varying Hr with
irregular rhythm. The QRS is approx. 0.15sec wide and only occurs
occasionally? What should the sleep tech recommend? - ANSWER - O2
therapy
pg. 2
,3|Page
Which uses a battery, a thermocouple or a thermistor - ANSWER -
Thermistor
After 3 hours of a split night study a pt has 90 documented central
apneas and no obstructive apneas. Minimal hypopneas are seen. What
should the sleep tech FIRST recommend for the pt - ANSWER - CPAP
not Bilevel
After 3 hours of a split night study a pt has 90 documented central
apneas and no obstructive apneas. Minimal hypopneas are seen. Which
should the tech recommend - ANSWER - APAP
Which of the following is most likely associated with sleep apnea?
Drug addiction
Morbid Obesity
Diabetes Mellites
Chronic Bronchitis - ANSWER - Morbid Obesity
What is the role of the sympathetic nervous system - ANSWER - Fight
or Flight
What is the role of the parasympathetic nervous system - ANSWER -
controls smooth muscles (i.e. regulates hr, digestion
This structure of the brain communicates with the cerebral cortex and if
damaged, coma is likely to occur - ANSWER - Thalamus
pg. 3
, 4|Page
The SCN is located in which structure of the brain - ANSWER -
Hypothalamus
What external factor is the SCN affected by and what is the function of
the SCN - ANSWER - Light
SCN is pacemaker for the circadian rhythm
What type of lead placement is most often used to record ECG in sleep
studies - ANSWER - Single Modified EKG Lead II using torso electrode
placement is RECOMMENDED
Hypoxiema and hypokalemia are often causes of what cardiac
arrhythmia - ANSWER - PVC
Write the formula that relates Volts, Current (I), and Resistance.
This formula is also known as _______________ Law - ANSWER - V =
IxR
Ohms Law
Write the formula that relates Volts, Sensitivity and Pen Deflection -
ANSWER - V = S x PD
In the 10-20 system, the acronym FCPOT stands for - ANSWER -
Frontal
Central
pg. 4
NBRC SDS EXAM 2 NEWEST 2025 ACTUAL EXAM|
COMPLETE 170 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+| SDS NBRC EXAM 2025
(BRAND NEW!!)
List 3 items that must be scored for MSLT - ANSWER - 1. Sleep
latencies for each nap
2. MSLT for the entire test (avg of ALL naps)
3. SOREM periods
Correct position for and esophageal pH monitoring catheter is... -
ANSWER - advance catheter until pH< 4.0 and then withdraw 5cm, tape
and record tube placement at nostril
Describe the anatomic position an esophageal pH catheter should be
placed - ANSWER - Cather tip should be 5cm above the upper border of
the lower esophageal sphincter
An ECG tracing shows a beat with an irregular rhythm, QRS >0.12sec,
and a varying rate. The sleep tech would classify this as - ANSWER -
PVC
Normal QRS interval is - ANSWER - 0.04 - 0.10sec (No bigger than 2.5
tiny boxes)
pg. 1
,2|Page
Normal PR interval is - ANSWER - 0.12-0.20 sec (No bigger than 1
large box)
Formula for calculating Hr on ECG tracing - ANSWER - 300 % # of
large boxes between R waves
A pt is noted to have EDS but no REM onset. The pt has indicated she
sometimes sleeps 14 hours per day. The sleep tech would classify this
situation as - ANSWER - Idiopathic insomnia
This dyssomnia presents as EDS but without sleep onset REM or
cataplexy - ANSWER - Idiopathic Hypersomnia (Primary Hypersomnia)
List two types of Recurrent Hypersomnia - ANSWER - 1. Klein Levin
2. Menstrual Related
This type of Recurrent Hypersomnia presents with odd behaviors such
as binge eating, hypersexuality and confusion) ...more common in men -
ANSWER - Klein Levin syndrome
(Low volt slow wave EEG)
A sleep tech notices that the ECG channel shows a varying Hr with
irregular rhythm. The QRS is approx. 0.15sec wide and only occurs
occasionally? What should the sleep tech recommend? - ANSWER - O2
therapy
pg. 2
,3|Page
Which uses a battery, a thermocouple or a thermistor - ANSWER -
Thermistor
After 3 hours of a split night study a pt has 90 documented central
apneas and no obstructive apneas. Minimal hypopneas are seen. What
should the sleep tech FIRST recommend for the pt - ANSWER - CPAP
not Bilevel
After 3 hours of a split night study a pt has 90 documented central
apneas and no obstructive apneas. Minimal hypopneas are seen. Which
should the tech recommend - ANSWER - APAP
Which of the following is most likely associated with sleep apnea?
Drug addiction
Morbid Obesity
Diabetes Mellites
Chronic Bronchitis - ANSWER - Morbid Obesity
What is the role of the sympathetic nervous system - ANSWER - Fight
or Flight
What is the role of the parasympathetic nervous system - ANSWER -
controls smooth muscles (i.e. regulates hr, digestion
This structure of the brain communicates with the cerebral cortex and if
damaged, coma is likely to occur - ANSWER - Thalamus
pg. 3
, 4|Page
The SCN is located in which structure of the brain - ANSWER -
Hypothalamus
What external factor is the SCN affected by and what is the function of
the SCN - ANSWER - Light
SCN is pacemaker for the circadian rhythm
What type of lead placement is most often used to record ECG in sleep
studies - ANSWER - Single Modified EKG Lead II using torso electrode
placement is RECOMMENDED
Hypoxiema and hypokalemia are often causes of what cardiac
arrhythmia - ANSWER - PVC
Write the formula that relates Volts, Current (I), and Resistance.
This formula is also known as _______________ Law - ANSWER - V =
IxR
Ohms Law
Write the formula that relates Volts, Sensitivity and Pen Deflection -
ANSWER - V = S x PD
In the 10-20 system, the acronym FCPOT stands for - ANSWER -
Frontal
Central
pg. 4
