Invos regional oxygen saturation¶

Cerebral oximetry; no signal shared with the reference.

Stub

Imported from the time-source table; the full page is still to be written.


Name in the dataset	`Invos/SCO2_L`
Type	numeric
Device	Invos
Stamped by	Recorder PC clock
Unit	%

Measurement space¶

Time side (as stamped): the true time lies between -110 s and -1 s from the stamp: the delay range plus the interval one value describes.

Time¶

From UTC to the stored time stamp¶

Derived from this signal's timing table; a written chain is still to come.

The clock path first (UTC to the clock that stamps or spaces the samples), then the signal's own path to its stored time. Each bar: the time shift or error the step introduces (pale) and what is left after the atlas's correction (solid), on a log scale; dashed when estimated or assumed.

UTC

The reference every chain starts from.

Recorder PC clock

sync assumed 3 ms – 900 ms · clock link, parameter

Windows time synchronisation to the hospital's time server every 8–24 h (assumed), drifting a few ppm in between. Not observable in the release: dates are shifted to 2100. No step of 0.5 s or more was found.

Recorder PC clock

transport estimated 1 s – 100 s

Delay from the end of the interval a value describes to its stamp.

Stored time stamp

window estimated 1 s – 10 s

The width of the interval one value or sample stands for.

Timing¶

Against the working reference. Delay: from the end of the interval a value describes to its stamp. Interval: how wide that interval is.

Form	Delay	Interval	Clock domain	Status	Evidence
as stamped (default)	1 s – 100 s	1 s – 10 s	Invos and FMS	estimated	not synchronised; FMS flow start -> CVP rise 32 s median (plausible); Invos uninformative

Combine it with other signals in the synchronisation planner.

Value¶

Its value side is still to be described.

Studies¶

Study	Date	Status	Summary
Drug effects as a clock check	2026-10-13	current	Infusion pumps, the rapid infuser and the cerebral oximeter share no waveform with the reference. Drug effects that follow infusions at plausible delays (propofol to BIS in about 2 minutes, fluid to CVP in about 30 s) bound their clocks to well within a minute of the recorder.

Worked examples¶

Example	Side	Status	Summary
A cerebral autoregulation index from arterial pressure and cerebral oxygenation	time	planned	A moving correlation between mean arterial pressure and INVOS cerebral oxygenation, and how lag between the two devices changes it.

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