The EMR clock's offset cannot be separated from documentation lag¶
Both routes between the EMR clock and the recorder run through the case start, so any EMR clock offset cancels. Without a time from outside the release it is confounded with how late entries are made.
| Status | established: shown on many cases, with a control. |
| Clocks | Hospital records clock, Recorder PC clock |
| Devices | Clinical records |
| Variables | Anaesthesia record events |
What it means¶
Only one constraint remains: entries rarely precede the device events they document.
Evidence¶
| 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. |
| Anaesthesia record times are rounded up | 2026-10-12 | current | Anaesthesia start and end entered on a 5-minute mark sit 90–290 s later, against device markers, than entries typed to the minute. Rounding up to the next 5 minutes fits every one of 11 markers better than rounding to the nearest or down. |