Connectivity changes underlying spectral EEG changes during propofol-induced loss of consciousness.
Boly, Mélanie ; ; et al
in The Journal of neuroscience : the official journal of the Society for Neuroscience (2012), 32(20), 7082-90
The mechanisms underlying anesthesia-induced loss of consciousness remain a matter of debate. Recent electrophysiological reports suggest that while initial propofol infusion provokes an increase in fast ... [more ▼]
The mechanisms underlying anesthesia-induced loss of consciousness remain a matter of debate. Recent electrophysiological reports suggest that while initial propofol infusion provokes an increase in fast rhythms (from beta to gamma range), slow activity (from delta to alpha range) rises selectively during loss of consciousness. Dynamic causal modeling was used to investigate the neural mechanisms mediating these changes in spectral power in humans. We analyzed source-reconstructed data from frontal and parietal cortices during normal wakefulness, propofol-induced mild sedation, and loss of consciousness. Bayesian model selection revealed that the best model for explaining spectral changes across the three states involved changes in corticothalamic interactions. Compared with wakefulness, mild sedation was accounted for by an increase in thalamic excitability, which did not further increase during loss of consciousness. In contrast, loss of consciousness per se was accompanied by a decrease in backward corticocortical connectivity from frontal to parietal cortices, while thalamocortical connectivity remained unchanged. These results emphasize the importance of recurrent corticocortical communication in the maintenance of consciousness and suggest a direct effect of propofol on cortical dynamics. [less ▲]Detailed reference viewed: 36 (4 ULg)
Persistent hypocoagulability in patients with septic shock predicts greater hospital mortality: impact of impaired thrombin generation.
MASSION, Paul ; PETERS, Pierre ; LEDOUX, Didier et al
in Intensive Care Medicine (2012), 38(8), 1326-35
PURPOSE: Sepsis induces hypercoagulability, hypofibrinolysis, microthrombosis, and endothelial dysfunction leading to multiple organ failure. However, not all studies reported benefit from anticoagulation ... [more ▼]
PURPOSE: Sepsis induces hypercoagulability, hypofibrinolysis, microthrombosis, and endothelial dysfunction leading to multiple organ failure. However, not all studies reported benefit from anticoagulation for patients with severe sepsis, and time courses of coagulation abnormalities in septic shock are poorly documented. Therefore, the aim of this prospective observational cohort study was to describe the coagulation profile of patients with septic shock and to determine whether alterations of the profile are associated with hospital mortality. METHODS: Thirty-nine patients with septic shock on ICU admission were prospectively included in the study. From admission to day 7, analytical coagulation tests, thrombin generation (TG) assays, and thromboelastometric analyses were performed and tested for association with survival. RESULTS: Patients with septic shock presented on admission prolongation of prothrombin time, activated partial thromboplastin time (aPTT), increased consumption of most procoagulant factors as well as both delay and deficit in TG, all compatible with a hypocoagulable state compared with reference values (P < 0.001). Time courses revealed a persistent hypocoagulability profile in non-survivors as compared with survivors. From multiple logistic regression, prolonged aPTT (P = 0.007) and persistence of TG deficit (P = 0.024) on day 3 were strong predictors of mortality, independently from disease severity scores, disseminated intravascular coagulation score, and standard coagulation tests on admission. CONCLUSIONS: Patients with septic shock present with hypocoagulability at the time of ICU admission. Persistence of hypocoagulability assessed by prolonged aPTT and unresolving deficit in TG on day 3 after onset of septic shock is associated with greater hospital mortality. [less ▲]Detailed reference viewed: 66 (17 ULg)
End-of-life attitudes are mediated by opinions of pain perception in patients with disorders of consciousness
Demertzi, Athina ; ; LEDOUX, Didier et al
Conference (2011, November 16)Detailed reference viewed: 14 (1 ULg)
Severity of ICU-acquired pneumonia according to infectious microorganisms
DAMAS, Pierre ; LAYIOS, Nathalie ; SEIDEL, Laurence et al
in Intensive Care Medicine (2011), 37(7), 1128-35Detailed reference viewed: 37 (8 ULg)
Evaluation quantitative de la réanimation volémique chez l'enfant brûlé : étude rétrospective.
ROUSSEAU, Anne-Françoise ; LEDOUX, Didier ; et al
Conference (2011, June)Detailed reference viewed: 51 (17 ULg)
Do dead from cardiovascular death donors experience end-of-life shortening?
LEDOUX, Didier ; DELBOUILLE, Marie-Hélène ; MONARD, Josée et al
Conference (2011, March 24)Detailed reference viewed: 49 (6 ULg)
A survey on self-assessed well-being in a cohort of chronic locked-in syndrome patients: happy majority, miserable minority
Bruno, Marie-Aurélie ; ; LEDOUX, Didier et al
in BMJ Open (2011), 1
Objectives Locked-in syndrome (LIS) consists of anarthria and quadriplegia while consciousness is preserved. Classically, vertical eye movements or blinking allow coded communication. Given appropriate ... [more ▼]
Objectives Locked-in syndrome (LIS) consists of anarthria and quadriplegia while consciousness is preserved. Classically, vertical eye movements or blinking allow coded communication. Given appropriate medical care, patients can survive for decades. We studied the self-reported quality of life in chronic LIS patients.Design 168 LIS members of the French Association for LIS were invited to answer a questionnaire on medical history, current status and end-of-life issues. They self-assessed their global subjective well-being with the Anamnestic Comparative Self-Assessment (ACSA) scale, whose +5 and −5 anchors were their memories of the best period in their life before LIS and their worst period ever, respectively.Results 91 patients (54%) responded and 26 were excluded because of missing data on quality of life. 47 patients professed happiness (median ACSA +3) and 18 unhappiness (median ACSA −4). Variables associated with unhappiness included anxiety and dissatisfaction with mobility in the community, recreational activities and recovery of speech production. A longer time in LIS was correlated with happiness. 58% declared they did not wish to be resuscitated in case of cardiac arrest and 7% expressed a wish for euthanasia.Conclusions Our data stress the need for extra palliative efforts directed at mobility and recreational activities in LIS and the importance of anxiolytic therapy. Recently affected LIS patients who wish to die should be assured that there is a high chance they will regain a happy meaningful life. End-of-life decisions, including euthanasia, should not be avoided, but a moratorium to allow a steady state to be reached should be proposed. [less ▲]Detailed reference viewed: 231 (15 ULg)
Attitudes towards end-of-life issues in disorders of consciousness : a European survey
Demertzi, Athina ; LEDOUX, Didier ; Bruno, Marie-Aurélie et al
in Journal of Neurology (2011), 258
Previous European surveys showed the support of healthcare professionals for treatment withdrawal [i.e., artificial nutrition and hydration (ANH) in chronic vegetative state (VS) patients]. The recent ... [more ▼]
Previous European surveys showed the support of healthcare professionals for treatment withdrawal [i.e., artificial nutrition and hydration (ANH) in chronic vegetative state (VS) patients]. The recent definition of minimally conscious state (MCS), and possibly research advances (e.g., functional neuroimaging), may have lead to uncertainty regarding potential residual perception and may have influenced opinions of healthcare professionals. The aim of the study was to update the end-of-life attitudes towards VS and to determine the end-of-life attitudes towards MCS. A 16-item questionnaire related to consciousness, pain and end-of-life issues in chronic (i.e., >1 year) VS and MCS and locked-in syndrome was distributed among attendants of medical and scientific conferences around Europe (n = 59). During a lecture, the items were explained orally to the attendants who needed to provide written yes/no responses. Chi-square tests and logistic regression analyses identified differences and associations for age, European region, religiosity, profession, and gender. We here report data on items concerning end-of-life issues on chronic VS and MCS. Responses were collected from 2,475 participants. For chronic VS (>1 year), 66% of healthcare professionals agreed to withdraw treatment and 82% wished not to be kept alive (P < 0.001). For chronic MCS (>1 year), less attendants agreed to withdraw treatment (28%, P < 0.001) and wished not to be kept alive (67%, P < 0.001). MCS was considered worse than VS for the patients in 54% and for their families in 42% of the sample. Respondents’ opinions were associated with geographic region and religiosity. Our data show that end-of-life opinions differ for VS as compared to MCS. The introduction of the diagnostic criteria for MCS has not substantially changed the opinions on end-of-life issues on permanent VS. Additionally, the existing legal ambiguity around MCS may have influenced the audience to draw a line between expressing preferences for self versus others, by implicitly recognizing that the latter could be a step on the slippery slope to legalize euthanasia. Given the observed individual variability, we stress the importance of advance directives and identification of proxies when discussing end-of-life issues in patients with disorders of consciousness. [less ▲]Detailed reference viewed: 270 (12 ULg)
Automated EEG entropy measurements in coma, vegetative state/unresponsive wakefulness syndrome and minimally conscious state
Gosseries, Olivia ; Schnakers, Caroline ; LEDOUX, Didier et al
in Functional Neurology (2011), 36
Monitoring the level of consciousness in brain injured patients with disorders of consciousness is crucial as it provides diagnostic and prognostic information. Behavioral assessment remains the gold ... [more ▼]
Monitoring the level of consciousness in brain injured patients with disorders of consciousness is crucial as it provides diagnostic and prognostic information. Behavioral assessment remains the gold standard for assessing consciousness but previous studies have shown a high rate of misdiagnosis. This study aimed to investigate the usefulness of electroencephalography (EEG) entropy measurements in differentiating unconscious (coma or vegetative) from minimally conscious patients. Left fronto-temporal EEG recordings (10-minute resting state epochs) were prospectively obtained in 56 patients and 16 age-matched healthy volunteers. Patients were assessed in the acute (≤1 month post-injury;n=29) or chronic (>1 month post-injury; n=27) stage. The etiology was traumatic in 23 patients. Automated online EEG entropy calculations (providing an arbitrary value ranging from 0 to 91) were compared with behavioral assessments (Coma Recovery Scale-Revised) and outcome. EEG entropy correlated with Coma Recovery Scale total scores (r=0.49). Mean EEG entropy values were higher in minimally conscious (73±19; mean and standard deviation) than in vegetative/unresponsive wakefulness syndrome patients (45±28). Receiver operating characteristic analysis revealed an entropy cut-off value of 52 differentiating acute unconscious from minimally conscious patients (sensitivity 89% and specificity 90%). In chronic patients, entropy measurements offered no reliable diagnostic information. EEG entropy measurements did not allow prediction of outcome. User-independent time-frequency balanced spectral EEG entropy measurements seem to constitute an interesting diagnostic – albeit not prognostic – tool for assessing neural network complexity in disorders of consciousness in the acute setting. Future studies are needed before using this tool in routine clinical practice, and these should seek to improve automated EEG quantification paradigms in order to reduce the remaining false negative and false positive findings. [less ▲]Detailed reference viewed: 482 (13 ULg)
Comparison between blood serum and salivary cortisol concentrations in horses using an adrenocorticotropic hormone challenge
Peeters, Marie ; ; Beckers, Jean-François et al
in Equine Veterinary Journal (2011), 43(4), 487-493Detailed reference viewed: 55 (3 ULg)
Comparison of the Full Outline of UnResponsiveness and Glasgow Liege Scale/Glasgow Coma Scale in an Intensive Care Unit Population.
Bruno, Marie-Aurélie ; LEDOUX, Didier ; LAMBERMONT, Bernard et al
in Neurocritical Care (2011), 15(3), 447-53
BACKGROUND: The Full Outline of UnResponsiveness (FOUR) has been proposed as an alternative for the Glasgow Coma Scale (GCS)/Glasgow Liege Scale (GLS) in the evaluation of consciousness in severely brain ... [more ▼]
BACKGROUND: The Full Outline of UnResponsiveness (FOUR) has been proposed as an alternative for the Glasgow Coma Scale (GCS)/Glasgow Liege Scale (GLS) in the evaluation of consciousness in severely brain-damaged patients. We compared the FOUR and GLS/GCS in intensive care unit patients who were admitted in a comatose state. METHODS: FOUR and GLS evaluations were performed in randomized order in 176 acutely (<1 month) brain-damaged patients. GLS scores were transformed in GCS scores by removing the GLS brainstem component. Inter-rater agreement was assessed in 20% of the studied population (N = 35). A logistic regression analysis adjusted for age, and etiology was performed to assess the link between the studied scores and the outcome 3 months after injury (N = 136). RESULTS: GLS/GCS verbal component was scored 1 in 146 patients, among these 131 were intubated. We found that the inter-rater reliability was good for the FOUR score, the GLS/GCS. FOUR, GLS/GCS total scores predicted functional outcome with and without adjustment for age and etiology. 71 patients were considered as being in a vegetative/unresponsive state based on the GLS/GCS. The FOUR score identified 8 of these 71 patients as being minimally conscious given that these patients showed visual pursuit. CONCLUSIONS: The FOUR score is a valid tool with good inter-rater reliability that is comparable to the GLS/GCS in predicting outcome. It offers the advantage to be performable in intubated patients and to identify non-verbal signs of consciousness by assessing visual pursuit, and hence minimal signs of consciousness (11% in this study), not assessed by GLS/GCS scales. [less ▲]Detailed reference viewed: 78 (4 ULg)
Relation entre défaillances vitales précédant l'infection acquise aux soins intensifs et gravité de celle-ci
; LEDOUX, Didier ; NYS, Monique et al
in Réanimation (2011), 20(Suppl 1), 108102Detailed reference viewed: 12 (4 ULg)
Clinical sedation and bispectral index in burn children receiving gamma-hydroxybutyrate.
ROUSSEAU, Anne-Françoise ; ; et al
in European Journal of Anaesthesiology. Supplement (2011), 28(Suppl 48), 150Detailed reference viewed: 22 (5 ULg)
End of life care in the operating room for non-heart-beating donors: organization at the University Hospital of Liege.
JORIS, Jean ; KABA, Abdourahmane ; LAUWICK, Séverine et al
in Transplantation Proceedings (2011), 43(9), 3441-4
Non-heart-beating (NHB) organ donation has become an alternative source to increase organ supply for transplantation. A NHB donation program was implemented in our institution in 2002. As in many ... [more ▼]
Non-heart-beating (NHB) organ donation has become an alternative source to increase organ supply for transplantation. A NHB donation program was implemented in our institution in 2002. As in many institutions the end of life care of the NHB donor (NHBD) is terminated in the operating room (OR) to reduce warm ischemia time. Herein we have described the organization of end of life care for these patients in our institution, including the problems addressed, the solution proposed, and the remaining issues. Emphasis is given to our protocol elaborated with the different contributors of the chain of the NHB donation program. This protocol specifies the information mandatory in the medical records, the end of life care procedure, the determination of death, and the issue of organ preservation measures before NHBD death. The persisting malaise associated with NHB donation reported by OR nurses is finally documented using an anonymous questionnaire. [less ▲]Detailed reference viewed: 144 (24 ULg)
Quantitative evaluation of fluid resuscitation in burn children : a retrospective study.
ROUSSEAU, Anne-Françoise ; LEDOUX, Didier ; et al
in Burns : Journal of the International Society for Burn Injuries (2011), 37(suppl 1), 12Detailed reference viewed: 43 (11 ULg)
Assessment of consciousness with electrophysiological and neurological imaging techniques.
Bruno, Marie-Aurélie ; Gosseries, Olivia ; Ledoux, Didier et al
in Current Opinion in Critical Care (2011)
PURPOSE OF REVIEW: Brain MRI (diffusion tensor imaging and spectroscopy) and functional neuroimaging (PET, functional MRI, EEG and evoked potential studies) are changing our understanding of patients with ... [more ▼]
PURPOSE OF REVIEW: Brain MRI (diffusion tensor imaging and spectroscopy) and functional neuroimaging (PET, functional MRI, EEG and evoked potential studies) are changing our understanding of patients with disorders of consciousness encountered after coma such as the 'vegetative' or minimally conscious states. RECENT FINDINGS: Increasing evidence from functional neuroimaging and electrophysiology demonstrates some residual cognitive processing in a subgroup of patients who clinically fail to show any response to commands, leading to the recent proposal of 'unresponsive wakefulness syndrome' as an alternative name for patients previously coined 'vegetative' or 'apallic'. SUMMARY: Consciousness can be viewed as the emergent property of the collective behavior of widespread thalamocortical frontoparietal network connectivity. Data from physiological, pharmacological and pathological alterations of consciousness provide evidence in favor of this hypothesis. Increasing our understanding of the neural correlates of consciousness is helping clinicians to do a better job in terms of diagnosis, prognosis and finally treatment and drug development for these severely brain-damaged patients. The current challenge remains to continue translating this research from the bench to the bedside. Only well controlled large multicentric neuroimaging and electrophysiology studies will enable to identify which paraclinical diagnostic or prognostic test is necessary for our routine evidence-based assessment of individuals with disorders of consciousness. [less ▲]Detailed reference viewed: 179 (10 ULg)
Predicting Attitudes Towards Disorders of Consciousness: a European Survey
Demertzi, Athina ; ; LEDOUX, Didier et al
Conference (2010, September 11)Detailed reference viewed: 13 (1 ULg)
Hepatic dysfunction or failure and ICU-acquired infection
; LEDOUX, Didier ; MASSION, Paul et al
in Newsletter SIZ, special issue, Abstracts Spring Meeting (2010, June 25)Detailed reference viewed: 16 (1 ULg)
Effect of celecoxib combined with thoracic epidural analgesia on pain after thoracotomy
Senard, Marc ; ; Ledoux, Didier et al
in British Journal of Anaesthesia (2010), 105(2), 196-200Detailed reference viewed: 38 (6 ULg)
L’ECMO (ExtraCorporeal Membrane Oxygenation) aux soins intensifs : intérêt chez le patient en choc cardiogénique réfractaire, en hypoxémie réfractaire ou en arrêt cardiaque.
Massion, Paul ; Ledoux, Didier ; et al
in Revue Médicale de Liège (2010), 65
ExtraCorporeal Membrane Oxygenation (ECMO) is a cardiopulmonary assistance device able to support patients in cardiac arrest, refractory cardiogenic shock or refractory hypoxemia otherwise sentenced to ... [more ▼]
ExtraCorporeal Membrane Oxygenation (ECMO) is a cardiopulmonary assistance device able to support patients in cardiac arrest, refractory cardiogenic shock or refractory hypoxemia otherwise sentenced to death. Recent technical progresses, early indication decision, bedside multidisciplinary implant, specific complications screening and echocardiographic weaning testing are crucial points to allow success of this exceptional technique. [less ▲]Detailed reference viewed: 319 (45 ULg)