CardioQ pressure and flow¶

Arterial pressure and aortic flow waveforms from the CardioQ oesophageal Doppler monitor.

Stub

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


Name in the dataset	`CardioQ/ABP`
Type	waveform
Device	CardioQ
Stamped by	Recorder PC clock
Spaced by	CardioQ clock
Rate	180 Hz

Measurement space¶

Time side (after beat matching): the true time lies between -0.3056 s and -0.1 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.

CardioQ clock

clock measured 400 ms – 4.4 s → 100 ms – 300 ms after correction

Delay or clock offset to the stamp; removed by the beat matching to SNUADC ART.

Stored time stamp

window measured 5.6 ms

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
after beat matching (default)	100 ms – 300 ms	5.6 ms	SNUADC stamp-model time (the working reference)	measured	per stretch; matched-beat MAD 0.24 s, R-R correlation 0.96 (24 cases)
raw stamps	400 ms – 4.4 s	5.6 ms	CardioQ clock	measured	lag vs SNUADC ART p5-p95 0.4-4.4 s; re-anchors ~40 times per case

Combine it with other signals in the synchronisation planner.

Value¶

Its value side is still to be described.

Studies¶

Study	Date	Status	Summary
Closing loops in the timing graph	2026-10-13	current	Where two independent routes reach the same clock, the offsets around the loop must sum to zero. Three measured loops close within their noise; the BIS loop closes up to a constant latency; the proposed EMR loop is not a loop at all.
Rare devices against SNUADC	2026-10-13	current	CardioQ, EV1000, Vigileo and Vigilance each get a link to the SNUADC timeline: beat matching for the CardioQ, mean arterial pressure alignment for the EV1000 and Vigileo, and a long-window fit for Vigilance's averaged heart rate.

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