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Polysomnogram (PSG) Typically, this is an overnight
in-laboratory recording. However, if you routinely sleep during the day
or evenings, your testing hours can be customized as long as your
physician makes arrangements in advance. The PSG records essential
diagnostic data, including brain waves (EEG), muscle
contractions/movements (EMG), eye movements (EOG), air flow in nose and
mouth, breathing effort, pressure fluctuations in the nose, heart rate
and rhythm (ECG), blood oxygen saturation (SpO2), and body movements.
No invasive procedures are used in our routine PSG tests. If needed,
additional data can be collected.
Split night PSG If, during the first hours of your
PSG, the data we collect strongly supports the diagnosis of obstructive
sleep apnea syndrome, then an air-tight, lightweight, rubbery nose mask
or tubes that insert into your outer nostrils will be applied. These
are used to supply air, using the minimum pressure required to prevent
obstructions of your upper airway, for the remainder of the PSG.
Long-term seizure recording For this test, your
brain waves (EEG) are recorded throughout a sleep period. In some
cases, the test can last several consecutive days.
Multiple sleep latency test (MSLT) This test is
conducted after an overnight in-laboratory PSG. The MSLT begins
one-and-a-half to two hours after you wake up. You will then be
encouraged to sleep five consecutive times, once every two hours.
Multiple wakefulness test (MWT) This is a variation
of the MSLT, in which you will be instructed to stay awake sitting up
in bed, rather than napping, every two hours.
Actigraphy For this test, small wristwatch-like
devices will be attached to your wrists or ankles. They record the
rate, intensity, and pattern of your movements. These recordings can be
done in the laboratory or at home and work, and can continue for a week
or longer when necessary.
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At our sleep center,