Polysomnography

Laboratories are used to diagnose a wide range of disorders, including insomnia, apnea, narcolepsy, and restless leg syndrome.

Polysomnography, the standard diagnostic tool used in these laboratories, simultaneously records brain waves, eye movements, muscle activity, heart rate, breathing patterns, and blood oxygen levels throughout the night.

A typical session generates thousands of pages of data, which a trained technologist must score and interpret.

Narcolepsy, a neurological disorder that causes sudden and uncontrollable episodes, is associated with an unusual pattern of REM.

It is incredibly sedating, incredibly.

I mean, have you ever looked at PSG data when somebody's on Seroquel? They're having apneas, no arousals.

They're sleeping through everything.

They're like 30% N3.

Laboratories are used to diagnose a wide range of disorders, including insomnia, apnea, narcolepsy, and restless leg syndrome.

Polysomnography, the standard diagnostic tool used in these laboratories, simultaneously records brain waves, eye movements, muscle activity, heart rate, breathing patterns, and blood oxygen levels throughout the night.

A typical session generates thousands of pages of data, which a trained technologist must score and interpret.

Narcolepsy, a neurological disorder that causes sudden and uncontrollable episodes, is associated with an unusual pattern of REM.

Is it a common thing in your practice, or do you rely on clinical phenomenology in a, you know, polysomnogram with multiple sleep latency testing to confirm a diagnosis of narcolepsy?

Most commonly, you're gonna still do the PSG and the MSLT, obviously, because it's less invasive than doing the lumbar puncture.

There are scenarios, right, where you may consider doing the LP.

I think if someone has cataplexy, and you're pretty confident in that, and they have a positive PSG, MSLT testing done, you know, you really don't need the lumbar puncture, right? But if you're in that gray area that for whatever reason you have a really high suspicion they have narcolepsy, but for whatever reason the PSG, MSLT either couldn't be done or it was inconclusive, then I might think about doing the lumbar puncture.

The other scenario is that there are some patients who have to be on REM-suppressing medications, like antidepressants, for example.

In those patients, it can confound the results.

And so if you're not able to stop those for the MSLT testing, then that would be a scenario where I might use the lumbar puncture.

Insurance is another reason that, again, if you have some of that inconclusive findings on the PSG, MSLT, that doing the lumbar puncture then can help to confirm the diagnosis, but only useful for type one narcolepsy, not type two.

This review paper looks at the polysomnographic data.

Polysomnography is just the clinical sleep study, the one where you spend the night with sensors tracking your breathing, brain waves and oxygen levels, and examines what it shows specifically in perimenopausal women.

The data suggests that the breathing disruptions in this group are associated with measurable changes in cognitive function, memory, processing speed, Attention, the stuff that often gets called brain fog.

Now I want to be precise here because this matters.