ESSENTIALS OF POLYSOMNOGRAPHY FINAL
PAPER 2026 COMPLETE ANSWERS VERIFIED
◉ What percentage of the circumference of the head is T5 from T3?
Answer: 10%
◉ Where should the chin EMG electrodes be placed? Answer: Above
and below the chin
◉ Which of these electrode sites is not typically used in a baseline
montage? Answer: Arm EMG
◉ The exploring electrode detects a voltage of -20uV. The output
voltage is 50uV. What voltage did the reference electrode detect at
this time?
(Output voltage = Voltage detected - Voltage Detected by the
reference)
(-20 - X = 50) Answer: -70uV
◉ Which muscle are the leg EMG electrodes placed over? Answer:
Anterior tibialis
,◉ G1 and G2 both equal -25uV. What is the output voltage? Answer:
0uV
◉ Which of these electrodes is located 20% of the horizontal
measurement of the head (pre-auricular point to pre-auricular
point) to the left of Cz? Answer: C3
◉ The E2 electrode is placed out and up from the outer corner of the
right eye, and the E1 electrode is placed out and down from the
outer corner of the left eye. If the montage has the E2 channel as
channel 5 and the E1 channel as channel 6, what will the waves on
these channels do when the patient looks up? Answer: Move
towards each other
◉ G1 = -80uV and the output voltage is 20uV. What is the voltage at
G2?
( G1 - G2 = 20uV)
(-80 - G2 = 20uV) Answer: -100uV
◉ Which electrode site is half the distance from Fp2 to T4? Answer:
F8
◉ What percentage of the vertical measurement of the head (nasion
to inion) is Pz from the inion? Answer: 30%
,◉ The distance from pre-auricular point to pre-auricular point is
36cm. What is the distance from the left pre-auricular point to T3?
(10% from pre-auricular point to T3) Answer: 3.6 cm
◉ The measurement from T6 to Pz is 8cm. What is the distance from
P4 to Pz?
(P4 is half the distance from T6 to Pz) Answer: 4cm
◉ The measurement from F7 to F3 is 6cm. What is the distance from
P4 to Fz? Answer: 6.0cm
◉ What electrode site is located half the distance from O2 to C4?
Answer: P4
◉ Which electrode site is 10% above the inion? Answer: Oz
◉ A stress loop can be most helpful when applying which
electrodes? Answer: Leg EMGs
, ◉ An EEG channel presents a high amplitude, low frequency artifact.
Which of these is most likely the cause? Answer: Sweat artifact
◉ Which of the following is verified during the time axis alignment
check? Answer: Vertical pen alignment
◉ During physiologic calibrations, you notice 60Hz artifact in the leg
EMG's. What is the best method of correcting this? Answer: Reapply
or replace the recording electrodes for this channel
◉ Which of the following actions should the technologist not take in
response to a low amplitude in the airflow channel? Answer:
Recalibrate the amplifier
◉ Electrical interference can best be prevented if which of the follow
actions are taken? Answer: The impedances of input electrodes are
similar
◉ The PSG has a leakage current of 200uA. What should the
technician do about this? Answer: Do not use the equipment until
the leakage current is lowered.
◉ During the night, the technician notices a gradual decline of the
SpO2 by 8%. Which of the following would help determine the cause
PAPER 2026 COMPLETE ANSWERS VERIFIED
◉ What percentage of the circumference of the head is T5 from T3?
Answer: 10%
◉ Where should the chin EMG electrodes be placed? Answer: Above
and below the chin
◉ Which of these electrode sites is not typically used in a baseline
montage? Answer: Arm EMG
◉ The exploring electrode detects a voltage of -20uV. The output
voltage is 50uV. What voltage did the reference electrode detect at
this time?
(Output voltage = Voltage detected - Voltage Detected by the
reference)
(-20 - X = 50) Answer: -70uV
◉ Which muscle are the leg EMG electrodes placed over? Answer:
Anterior tibialis
,◉ G1 and G2 both equal -25uV. What is the output voltage? Answer:
0uV
◉ Which of these electrodes is located 20% of the horizontal
measurement of the head (pre-auricular point to pre-auricular
point) to the left of Cz? Answer: C3
◉ The E2 electrode is placed out and up from the outer corner of the
right eye, and the E1 electrode is placed out and down from the
outer corner of the left eye. If the montage has the E2 channel as
channel 5 and the E1 channel as channel 6, what will the waves on
these channels do when the patient looks up? Answer: Move
towards each other
◉ G1 = -80uV and the output voltage is 20uV. What is the voltage at
G2?
( G1 - G2 = 20uV)
(-80 - G2 = 20uV) Answer: -100uV
◉ Which electrode site is half the distance from Fp2 to T4? Answer:
F8
◉ What percentage of the vertical measurement of the head (nasion
to inion) is Pz from the inion? Answer: 30%
,◉ The distance from pre-auricular point to pre-auricular point is
36cm. What is the distance from the left pre-auricular point to T3?
(10% from pre-auricular point to T3) Answer: 3.6 cm
◉ The measurement from T6 to Pz is 8cm. What is the distance from
P4 to Pz?
(P4 is half the distance from T6 to Pz) Answer: 4cm
◉ The measurement from F7 to F3 is 6cm. What is the distance from
P4 to Fz? Answer: 6.0cm
◉ What electrode site is located half the distance from O2 to C4?
Answer: P4
◉ Which electrode site is 10% above the inion? Answer: Oz
◉ A stress loop can be most helpful when applying which
electrodes? Answer: Leg EMGs
, ◉ An EEG channel presents a high amplitude, low frequency artifact.
Which of these is most likely the cause? Answer: Sweat artifact
◉ Which of the following is verified during the time axis alignment
check? Answer: Vertical pen alignment
◉ During physiologic calibrations, you notice 60Hz artifact in the leg
EMG's. What is the best method of correcting this? Answer: Reapply
or replace the recording electrodes for this channel
◉ Which of the following actions should the technologist not take in
response to a low amplitude in the airflow channel? Answer:
Recalibrate the amplifier
◉ Electrical interference can best be prevented if which of the follow
actions are taken? Answer: The impedances of input electrodes are
similar
◉ The PSG has a leakage current of 200uA. What should the
technician do about this? Answer: Do not use the equipment until
the leakage current is lowered.
◉ During the night, the technician notices a gradual decline of the
SpO2 by 8%. Which of the following would help determine the cause
