Study of Exploratory Plasmatic Markers of Alcohol Withdrawal

Plain-language summary

This research focuses on alcohol withdrawal in hospitals and its potential neurological consequences. Alcohol withdrawal is an event that induces physical symptoms, such as tremors, sweating, anxiety and requires medical support. Sometimes alcohol withdrawal results in neurological complications, such as epileptic seizures, delirium tremens, Wernicke Encephalopathy, memory and cognitive disorders. Chronic alcohol consumption and lack of vitamin B1 also cause neurological damage. Magnetic resonance imaging of the brain can be used to assess severe forms, but gives little information about possible recovery and mild or transient forms. Currently, there is no scientifically validated blood measurement to assess the intensity of these neurological complications, to predict their occurrence and recovery, or to distinguish between the consequences of chronic alcohol consumption, complications of alcohol withdrawal and vitamin B1 deficiency. This is non-experimental, non-controlled observational research. Four plasma biomarkers were selected to be evaluated in the field of alcoholology. t is the dosage of light neurofilaments (NFL), the Tau protein, the glial fibrillary acidic protein (GFAP) and the ubiquitin carboxyl terminal hydrolase L1 (UCHL-1). These biomarkers are studied, in particular in cerebrospinal fluid, in neurodegenerative diseases and in patients having experienced a cranial trauma. They were described in the literature as markers of cerebral suffering. NF-L would reflect the axon injury, Tau and UCHL-1 protein the neurons injury and GFAP the astrocytes injury. The Quanterix\* assay technique (SIMOA technology) allows simultaneous assay of these 4 biomarkers, with a detection threshold 100 times lower than that of the ELISA technique. This allows plasma assays to be performed and is therefore more accessible and less risky for the patient than assays in cerebrospinal fluid. The objective was to study the kinetics of these four biomarkers (NFL, Tau, GFAP, UCHL-1) during alcohol withdrawal, it was decided to measure these plasma biomarkers at three points during alcohol withdrawal : at the beginning of withdrawal (T1 = J1), after the time when withdrawal is most intense and complications such as Wernicke Encephalopathy or delirium tremens usually occur (T2 = J3-J4), and at the end of alcohol withdrawal management (T3 = J13-J15). The choice of performing T1 the day after the patient's admission (D1) and not the day of the patient's admission (D0) was determined to allow a better homogeneity of the plasma assay and to respect the reflection period before signing the consent. Indeed, patients may have different levels of alcohol in their blood when they are admitted on the morning of D0. This induces a heterogeneous clinic and interferes with the interview and the delivery of an informed information. Moreover, the dosage thus carried out at D1 will be done fasting, on waking, while the patient will be non-alcoholic, under identical conditions for all patients. In this exploratory study, the number of subjects needed is set at 18 subjects who have completed the research, i.e., having had three samples at D1 (T1), D3-J4 (T2) and D13-J15 (T3) without alcohol consumption until T3. Subjects leaving the study before this third test will be replaced up to a maximum of 7 replacements. With no previous study to our knowledge measuring these biomarkers in alcohol withdrawal, we cannot anticipate the variance. We therefore set the number of subjects to be included based on the capacity of a SIMOA assay kit for the four biomarkers NLF, Tau, GFAP, and UCHL-1. Anticipating, the risk of alcohol reconsumption, early discharge and lost to follow-up, it is planned to include 25 patients. Inclusions will end after the third follow-up visit (T3) of the 18th patient for whom we will have all three samples taken (complete data) or after T3 of the 25th patient included. The risks for the patient are the occurrence of a complication during the procedures included in the protocol, i.e. for all patients, one or more haematomas at the points of venous sampling or the occurrence of a vagal malaise.

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