Neural coding of autonomic functions in different states of consciousness.
Piergiuseppe Liuzzi, Bahia Hakiki, Maenia Scarpino and 7 others
PMID 37491259WHAT IT FOUND
Brain-heart signal coupling was higher in patients with lower consciousness levels.
This pattern helps distinguish unresponsive or minimally responsive patients from those who have emerged, offering a non-invasive, bedside tool to support behavioral assessments.
Key findings
01Mutual information between EEG and ECG signals was significantly lower in patients with higher consciousness levels (EMCS and MCS+) compared to those with lower levels (MCS- and UWS).
02The presence of cortical reactivity and anteroposterior gradient in EEG background activity were significantly associated with better consciousness states.
03In hemorrhagic patients, mutual information was consistently higher on the side of the brain with the lesion.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study was monocentric, which may limit the generalizability of the findings. Neuroimaging scans were not available for all patients, so the precise relationship between lesion location and signal coupling could not be fully mapped. The analysis grouped MCS- and UWS patients together in secondary analyses, which may obscure specific differences between these two distinct behavioral states. The study is observational and does not establish causality between autonomic coupling and consciousness levels.
Declared interests
The study was funded by the Ministero della Salute (Italy) and Regione Toscana. The authors declared no other competing interests.
The easy way to misread this
Do not use this physiological measure as a standalone diagnostic tool. The study shows a group-level association, but individual patients may not fit this pattern. Behavioral assessment remains the gold standard for diagnosing consciousness levels.