The BIS EEG carries an averaged cardiac artefact¶
Averaged on the ECG's R peaks, the BIS EEG shows the heartbeat (median 4.3 µV), near-simultaneous with the R wave. Single beats are too weak to match one by one.
| Status | likely: consistent, with a known gap. |
| Devices | BIS monitor, SNUADC |
| Variables | BIS EEG, ECG lead II (SNUADC) |
| Supersedes | The BIS EEG carries no heartbeat |
What it means¶
A second SNUADC–BIS timing reference for cases without bursts. Shown on 30 cases.
Evidence¶
| Study | Date | Status | Summary |
|---|---|---|---|
| The cardiac artefact in the BIS EEG | 2026-10-12 | current | The BIS EEG carries a weak electrical trace of every heartbeat. Too weak for beat-by-beat matching, it shows clearly when averaged on the ECG's R peaks, and gives a second SNUADC–BIS timing reference that agrees with the bursts to about 16 ms. |