Update of the European Society of Anaesthesiology and Intensive Care Medicine evidence-based and consensus-based guideline on postoperative delirium in adult patients.

Postoperative delirium (POD) remains a common, dangerous and resource-consuming adverse event but is often preventable. The whole peri-operative team can play a key role in its management. This update to the 2017 ESAIC Guideline on the prevention of POD is evidence-based and consensus-based and considers the literature between 01 April 2015, and 28 February 2022. The search terms of the broad literature search were identical to those used in the first version of the guideline published in 2017. POD was defined in accordance with the DSM-5 criteria. POD had to be measured with a validated POD screening tool, at least once per day for at least 3 days starting in the recovery room or postanaesthesia care unit on the day of surgery or, at latest, on postoperative day 1. Recent literature confirmed the pathogenic role of surgery-induced inflammation, and this concept reinforces the positive role of multicomponent strategies aimed to reduce the surgical stress response. Although some putative precipitating risk factors are not modifiable (length of surgery, surgical site), others (such as depth of anaesthesia, appropriate analgesia and haemodynamic stability) are under the control of the anaesthesiologists. Multicomponent preoperative, intra-operative and postoperative preventive measures showed potential to reduce the incidence and duration of POD, confirming the pivotal role of a comprehensive and team-based approach to improve patients' clinical and functional status.

[Prevention of Post-operative Delirium]. / Prävention des postoperativen Delirs.

Postoperative delirium (POD) is an adverse but often preventable complication of surgery and surgery-related anaesthesia, and increasingly prevalent. This article provides an overview on non-pharmacological preventive measures, divided into individualized and non-individualized measures. Non-individualized measures, such as the most minimally invasive surgical procedure, avoidance of unnecessary fasting before surgery, and the most tolerable anaesthesia are used to minimize the risk of POD in all patients. Based on the results of preoperative screenings for risk factors such as frailty or cognitive impairment, individualized measures may encompass prehabilitation, treatment of specific risk factors, operation room companionship or cognitive, motor, and sensory stimulation as well as social support. This article additionally lists several examples of best practice approaches already implemented in German-speaking countries and websites for further readings.

Cross-Sectional and Longitudinal Construct Validity of the Generic KINDL-A(dult)B(rief) Questionnaire in Adults with Thrombophilia or with Hereditary and Acquired Bleeding Disorders.

BACKGROUND/AIMS: The newly adapted generic KINDL-A(dult)B(rief) questionnaire showed satisfactory cross-sectional psychometric properties in adults with bleeding disorders or thrombophilia. This investigation aimed to evaluate its cross-sectional and longitudinal construct validity. METHODS: After ethical committee approval and written informed consent, 335 patients (mean age 51.8 ± 16.6 years, 60% women) with either predominant thrombophilia (n = 260) or predominant bleeding disorders (n = 75) participated. At baseline, patients answered the KINDL-AB, the MOS 36-item Short-Form Health Survey (SF-36), and the EQ-5D-3L. A subgroup of 117 patients repeated the questionnaire after a median follow-up of 2.6 years (range: 0.4-3.5). A priori hypotheses were evaluated regarding convergent correlations between KINDL-AB overall well-being and specific subscales, EQ-5D-3L index values (EQ-IV), EQ-5D visual analog scale (EQ-VAS), and SF-36 subscales. RESULTS: Contrary to hypothesis, baseline correlations between the KINDL-AB and EQ-IV/EQ-VAS were all moderate while, as hypothesized, several KINDL-AB subscales and SF-36 subscales correlated strongly. At follow-up, no significant changes in all three instruments occurred. Correlations between instruments over the follow-up were mostly moderate and partially strong. Contrary to hypothesis but consistent with no significant changes in health-related quality of life, convergent correlations between changes in KINDL-AB overall well-being, physical and psychological well-being, and EQ-IV/EQ-VAS were all weak. CONCLUSIONS: While repeated measures of KINDL-AB showed moderate to strong correlations, changes in KINDL-AB overall well-being and subscales correlated more weakly than expected with changes involving two established instruments of generic health status.

Role of prothrombin 19911 A>G polymorphism, blood group and male gender in patients with venous thromboembolism: Results of a German cohort study.

The role of the A>G polymorphism at position 19911 in the prothrombin gene (factor [F] 2 at rs3136516) as a risk factor for venous thromboembolism [VTE] is still unclear. To evaluate the presence of the F2 polymorphism in VTE patients compared to healthy blood donors and to adjust the results for common inherited thrombophilias [IT], age at onset and blood group [BG], and to calculate the risk of VTE recurrence. We investigated 1012 Caucasian patients with a diagnosis of VTE for the presence of the F2 rs3136516 polymorphism and compared these with 902 healthy blood donors. Odds ratios [OR] together with their 95% confidence intervals were calculated adjusted for F5 at rs6025, F2 at rs1799963, blood group, age and gender. In addition, we evaluated the risk of recurrent VTE during patient follow-up calculating hazard ratios [HR] together with their 95% CI. Compared with the AA wildtype, the F2 GG and AG genotypes (rs3136516) were associated with VTE (OR 1.48 and 1.45). The OR in F5 carriers compared to controls was 5.68 and 2.38 in patients with F2 (rs1799963). BG "non-O" was significantly more often diagnosed in patients compared to BG "O" (OR 2.74). VTE recurrence more often occurred in males (HR 2.3) and in carriers with combined thrombophilia (HR 2.11). Noteworthy, the rs3136516 polymorphism alone was not associated significantly with recurrence. In Caucasian patients with VTE the F2 GG/GA genotypes (rs3136516) were moderate risk factors for VTE. Recurrence was associated with male gender and combined thrombophilia.

[A clinical radiological score for femoral head grafts : Establishment of the Tabea FK score to ensure the quality of human femoral head grafts]. / Ein klinisch-radiologischer Score für Femurkopftransplantate : Etablierung des Tabea-FK-Scores zur Sicherung der Qualität humaner Femurkopftransplantate.

INTRODUCTION: Transplantation of cancellous tissue from human femoral heads (FK) is an established method in the reconstruction of bony defects in orthopedic and trauma surgery. Standardized rating systems with respect to the morphological quality of this tissue are not available. MATERIALS AND METHODS: In 91/105 patients who had been a regular, clinically-indicated surgery (arthroplasty of the hip joint) the respective femoral head (FK) was taken under standardized conditions. Using a checklist defined clinical and radiological criteria of FK are judged in terms of their quality (cysts, necrosis, calcification, deformities, osteoporosis) and divided by the Tabea FK score into three classes (best/middle/poor quality). This was followed by a blinded repeated scoring, now as macroscopic assessment of three sawed layers from the same femoral head. The femoral heads are examined by peripheral quantitative computed tomography (pQCT) and a standardized histological examination of the bony tissue. We evaluated the accordance of the Tabea FK score with complementary assessments by calculation of sensitivity and specificity. RESULTS: Femoral heads from 91/105 patients (ages: 68.4 ± 9.9 , n = 60 women, n = 31 men) were explanted and included in the study. The correlation between the primary radiologic clinical score (Tabea FK score) and the macroscopic second review of the sawn FK with respect to middle/best and poor/middle quality was classified as good (sensitivity 77% and 81%, respectively; specificity 76% and 84%, respectively). The correlation of histology and macroscopic second review was worse and in relation to discrimination of middle/best and poor/middle quality had a sensitivity of 85% and 54%, respectively, and a specificity of 66% and 97%, respectively. The pQCT showed a sensitivity of 82% only in discrimination of middle/best, while sensitivity in discrimination of poor/middle and poor/middle + best, respectively, was <10%. DISCUSSION: The corresponding correlation between the primary and the second clinical score was evaluated as good. This emphasizes the long-standing skills of operationally active orthopedic surgeons to classify the quality of cancellous bone correctly already on the basis of X­ray images and intraoperative findings. In this respect, the introduction of the Tabea FK score as a quality assurance tool in the routines of bone banks can be recommended.

Routine management of postoperative delirium outside the ICU: Results of an international survey among anaesthesiologists.

BACKGROUND: Postoperative delirium (POD) is a severe brain dysfunction. Although data indicate a high relevance, no survey has investigated the routine practice to monitor delirium outside the ICU setting after surgery. Prior to publishing of the new European Society of Anaesthesiology (ESA) guidelines on POD, an international survey was conducted to assess current practice. METHODS: European Society of Anaesthesiology-endorsed online survey; Trial Registration: NCT-identifier: 02513537. RESULTS: In total, 566 respondents from 62 countries accessed, and 564 (99.6%) completed the survey (completion rate). Overall, 385 (68%) of the respondents reported that delirium is either "very relevant" or "relevant" for their daily clinical practice. In all, 38 (7%) of the respondents routinely monitor for delirium in >50% of all patients. Asked on the monitoring time point, more than half (n = 308, 55%) indicated to screen before or at recovery room discharge, 235 (42%) up to the first postoperative day, 143 (25%) up to 3 days, and 77 (14%) up to 5 postoperative days. Although there is a lack of long-term monitoring, nearly all respondents (n = 530, 94%) reported to treat delirium. Availability of EEG/EMG-based monitoring to assess the depth of anaesthesia was high in the study group (n = 547, 97%) and was used by more than one-third of the respondents to reduce risk of burst suppression (n = 189, 34%). CONCLUSION: Although delirium is perceived as a relevant condition among anaesthesiologists, there is a high demand for implementing monitoring strategies after publishing of the POD Guideline. The survey shows that tools necessary for POD Guideline implementation are available in the centres represented by the respondents.

Routine frailty assessment predicts postoperative complications in elderly patients across surgical disciplines - a retrospective observational study.

BACKGROUND: Frailty is a frequent and underdiagnosed functional syndrome involving reduced physiological reserves and an increased vulnerability against stressors, with severe individual and socioeconomic consequences. A routine frailty assessment was implemented at our preoperative anaesthesia clinic to identify patients at risk. OBJECTIVE: This study examines the relationship between frailty status and the incidence of in-hospital postoperative complications in elderly surgical patients across several surgical disciplines. DESIGN: Retrospective observational analysis. SETTING: Single center, major tertiary care university hospital. Data collection took place between June 2016 and March 2017. PATIENTS: Patients 65 years old or older were evaluated for frailty using Fried's 5-point frailty assessment prior to elective non-cardiac surgery. Patients were classified into non-frail (0 criteria, reference group), pre-frail (1-2 positive criteria) and frail (3-5 positive criteria) groups. MAIN OUTCOME MEASURES: The incidence of postoperative complications was assessed until discharge from the hospital, using the roster from the National VA Surgical Quality Improvement Program. Propensity score matching and logistic regression analysis were performed. RESULTS: From 1186 elderly patients, 46.9% were classified as pre-frail (n = 556), and 11.4% as frail (n = 135). The rate of complications were significantly higher in the pre-frail (34.7%) and frail groups (47.4%), as compared to the non-frail group (27.5%). Similarly, length of stay (non-frail: 5.0 [3.0;7.0], pre-frail: 7.0 [3.0;9.0], frail 8.0 [4.5;12.0]; p < 0.001) and discharges to care facilities (non-frail:1.6%, pre-frail: 7.4%, frail: 17.8%); p < 0.001) were significantly associated with frailty status. After propensity score matching and logistic regression analysis, the risk for developing postoperative complications was approximately two-fold for pre-frail (OR 1.78; 95% CI 1.04-3.05) and frail (OR 2.08; 95% CI 1.21-3.60) patients. CONCLUSIONS: The preoperative frailty assessment of elderly patients identified pre-frail and frail subgroups to have the highest rate of postoperative complications, regardless of age, surgical discipline, and surgical risk. Significantly increased length of hospitalisation and discharges to care facilities were also observed. Implementation of routine frailty assessments appear to be an effective tool in identifying patients with increased risk. Now future studies are needed to investigate whether patients benefit from optimization of patient counselling, process planning, and risk reduction protocols based on the application of risk stratification.

Psychometric Properties of a Modified KINDL-R Questionnaire for Adolescents and Adults, and Construction of a Brief Version, the KINDL-A(dult)B(rief) Questionnaire, KINDL-AB.

BACKGROUND/AIMS: The generic quality of life KINDL-R -questionnaire is validated for use in children/adolescents ≤16 years. The aim of this cross-sectional investigation was to modify the KINDL-R questionnaire for use in adults and to validate its psychometric properties. METHODS: Five items of the KINDL-R questionnaire were adapted and the newly developed KINDL-A(dult) questionnaire administered to 255 patients with hereditary and acquired bleeding disorders (mean age 53 years). Its internal consistency and convergent and divergent construct validity were investigated and confirmatory factor analysis was used to evaluate the latent factor structure. RESULTS: The KINDL-A questionnaire showed satisfactory reliability, varying construct validity, but inconclusive factor structure. The KINDL-AB(rief) was developed by removing half of the items and combining 2 sub-axes. This led to factor loadings between 0.62 and 0.91 and increased overall fit (Goodness of fit > 0.8 and Root Mean Square Error of Approximation, RMSEA, < 0.08). Results were validated in 966 healthy blood donors (mean age 38 years). In this group, the KINDL-AB questionnaire showed factor loadings between 0.43 and 0.77, Goodness of fit > 0.95 and RMSEA < 0.05. CONCLUSIONS: The new KINDL-AB suggests sufficient to good psychometric properties in adult patients with hereditary and acquired bleeding disorders.

Pre- and postoperative management of risk factors for postoperative delirium: who is in charge and what is its essence?

Postoperative delirium (POD) is an adverse clinical outcome characterized by cognitive, affective and behavioral symptoms with typically an acute onset and a fluctuating course. POD is attributed to certain patients' predisposing factors as well as to treatment-related precipitating factors. While there are several single-component interventions for the prevention of POD, evolving evidence suggests the importance of a system approach in the prevention of POD. This involves strategies by multidisciplinary teams with additional geriatric consultation services to identify risk factors for POD and to modify their impact on the perioperative course. Some patients may profit from postponing an elective surgery and undergoing a prehabilitation program to optimize his/her resilience for the surgical and anesthesiologic stressors.

Emergency Department-Initiated Tobacco Control: Update of a Systematic Review and Meta-Analysis of Randomized Controlled Trials.

INTRODUCTION: A 2012 systematic review and meta-analysis of randomized controlled trials on emergency department-initiated tobacco control (ETC) showed only short-term efficacy. The aim of this study was to update data through May 2015. METHODS: After registering the study protocol on the international prospective register of systematic reviews (PROSPERO) in May 2015, we searched 7 databases and the gray literature. Our outcome of interest was the point prevalence of tobacco-use abstinence at 1-month, 3-month, 6-month, or 12-month follow-up. We calculated the relative risk (RR) of tobacco-use abstinence after ETC at each follow-up time separately for each study and then pooled Mantel-Haenszel RRs by follow-up time. These results were pooled with results of the 7 studies included in the previous review. We calculated the effect of ETC on the combined point prevalence of tobacco-use abstinence across all follow-up times by using generalized linear mixed models. RESULTS: We retrieved 4 additional studies, one published as an abstract, comprising 1,392 participants overall. The 1-month follow-up point prevalence of tobacco-use abstinence after ETC resulted in an RR of 1.49 (95% confidence interval [CI], 1.08-2.05) across 3 studies; 3-month follow-up, an RR of 1.38 (95% CI, 1.12-1.71) across 9 studies; 6-month follow-up, an RR of 1.09 (95% CI, 0.84-1.41) across 6 studies; and 12-month follow-up, an RR of 1.26 (95% CI, 1.00-1.59) across 3 studies. The effect on the combined point prevalence of abstinence was an RR of 1.40 (95% CI, 1.06-1.86) (P = .02). CONCLUSION: ETC is effective in promoting continual tobacco-use abstinence up to 12 months after intervention. ETC may be a critically important public health strategy for engaging hard-to-reach smokers in tobacco-use cessation.

European Society of Anaesthesiology evidence-based and consensus-based guideline on postoperative delirium.

The purpose of this guideline is to present evidence-based and consensus-based recommendations for the prevention and treatment of postoperative delirium. The cornerstones of the guideline are the preoperative identification and handling of patients at risk, adequate intraoperative care, postoperative detection of delirium and management of delirious patients. The scope of this guideline is not to cover ICU delirium. Considering that many medical disciplines are involved in the treatment of surgical patients, a team-based approach should be implemented into daily practice. This guideline is aimed to promote knowledge and education in the preoperative, intraoperative and postoperative setting not only among anaesthesiologists but also among all other healthcare professionals involved in the care of surgical patients.

Postoperative delirium: A preventable complication in the elderly surgical patient.

Postoperative delirium (POD) is an acute organic cerebral disturbance of consciousness and attention in combination with additional cognitive symptoms. It usually develops shortly after surgery and lasts for some hours up to some days. It worsens clinical outcomes, prolongs the hospital stay and leads to negative trajectories of cognitive, emotional and functional outcomes up to month if not years after surgery. There are several known predisposing and precipitating factors. Several of them are influenceable. Offering optimal and safe care for an elderly surgery patient requires a team based approach. Strategies for reducing POD incidence include early detection of risk factors, adaptation of surgical and anaesthesiologic techniques, avoiding certain drugs, optimisation of haemostasis, continuously monitoring of the patients' cognitive status as well as early mobilization and careful management of eventual early signs of POD. If POD is prevented, it's negative trajectories may be likewise anticipated.

[Why and How Should I Assess Frailty? A Guide for the Preoperative Anesthesia Clinic]. / Warum und wie sollte ich Frailty erfassen? ­ ein Ansatz für die Anästhesieambulanz.

Introduction: Frailty is a condition of decreased physiological reserves seen in approx. one third of elderly anesthesiological patients, and affecting many aspects of treatment as well as outcome. Although there are over 60 measurement instruments, frailty assessment is still poorly implemented. Understanding why and how to assess frailty is key to its implementation in preoperative anesthesia clinics. Method: After presenting the impact of perioperative frailty and the benefits of an early diagnosis on health related quality of life, we present an overview of the most important tools that can be used in the preoperative frailty assessment. Results: Early diagnosis offer several optimization opportunities for the perioperative period. The most efficient frailty assessment tools are presented and discussed, including physical, cognitive, and psychosocial aspects. Conclusion: Frailty assessments vary immensely in terms of required time, equipment, and expertise. We recommend at least one test for each domain of frailty, so as to obtain a more holistic view of the patient's physiological reserve. The implementation of an adequate and consistent preoperative frailty assessment has the potential to improve patient safety as well as short and long term outcomes.

Effects of an Innovative Psychotherapy Program for Surgical Patients: Bridging Intervention in Anesthesiology--A Randomized Controlled Trial.

BACKGROUND: The stepped care program Bridging Intervention in Anesthesiology (BRIA) aims at motivating and supporting surgical patients with comorbid mental disorders to engage in psychosocial mental healthcare options. This study examined the efficacy of BRIA. METHODS: This randomized, parallel-group, open-label, controlled trial was conducted in the preoperative anesthesiological assessment clinics and surgical wards of a large university hospital in Germany. A total of 220 surgical patients with comorbid mental disorders were randomized by using the computer-generated lists to one of two intervention groups: BRIA psychotherapy sessions up to 3 months postoperatively (BRIA) versus no psychotherapy/computerized brief written advice (BWA) only. Primary outcome was participation in psychosocial mental healthcare options at month 6. Secondary outcome was change of self-reported general psychological distress (Global Severity Index of the Brief Symptom Inventory) between baseline and month 6. RESULTS: At 6-month follow-up, the rate of patients who engaged in psychosocial mental healthcare options was 30% (33 of 110) in BRIA compared with 11.8% (13 of 110) in BWA (P = 0.001). Number needed to treat and relative risk reduction were 6 (95% CI, 4 to 13) and 0.21 (0.09 to 0.31), respectively. In BRIA, Global Severity Index decreased between baseline and month 6 (P < 0.001), whereas it did not change significantly in BWA (P = 0.197). CONCLUSIONS: Among surgical patients with comorbid mental disorders, BRIA results in an increased engagement in subsequent therapy options and a decrease of general psychological distress. These data suggest that it is reasonable to integrate innovative psychotherapy programs into the context of interdisciplinary surgical care.

Early ablation leads to better outcome in patients < 55 years with persistent atrial fibrillation.

The question of optimal timing for catheter ablation of atrial fibrillation (AF) to achieve best outcomes remains a crucial clinical issue. As AF occurs less frequently in younger patients, data regarding Diagnosis-to-Ablation Time (DAT) is especially limited in patients under the age of 55 years with persistent AF. We therefore analyzed the temporal relationship between initial AF presentation and timing of catheter ablation in this cohort. We conducted a retrospective single-centre study of patients ≤ 55 years with persistent AF who underwent first-time catheter ablation at our center. The cohort was divided into patients that underwent catheter ablation after diagnosis of persistent AF within a DAT of ≤ 12 months and patients with a DAT of > 12 months. A total of 101 patients (median age 51 years; female n = 19 (18.8%)) with persistent AF were included. Ablation was performed within 12 months ("early DAT") in 51 patients and > 12 months ("late DAT") in 50 patients. Pulmonary vein isolation was performed using high-power short-duration (HPSD) radiofrequency ablation. Median DAT was 5 months (1-12 months) in the early ablation group and 36 months (13-240 months) in the late ablation group. The median follow-up was 11.3 months (0.03-37.1 months). The rate of any atrial arrhythmia recurrence after a 30-day blanking period was significantly lower in the early DAT group (13/51 patients; 25.5%) as compared to the late DAT group (26/50 patients; 52.0%) (log rank test; p = 0.003). Catheter ablation performed > 12 months after the initial AF diagnosis was an independent predictor for the occurrence of any atrial arrythmia (OR: 2.58; (95%-CI: 1.32-5.07). Early first-time catheter ablation (DAT ≤ 12 months) in patients ≤ 55 years with persistent AF is associated with a significantly lower rate of arrhythmia recurrence.

Prevention and therapy of alcohol withdrawal on intensive care units: systematic review of controlled trials.

BACKGROUND: Alcohol withdrawal syndrome (AWS) occurs in 16 to 31% of intensive care unit (ICU) patients after cessation of sedation. There exist many preventive and therapeutic strategies, but no systematic review (SR) has been published on this topic so far. We aimed to perform a synopsis of all controlled trials of AWS prevention and therapy in ICU published between 1971 and 30 March 2011 following the "Preferred Reporting Items for Systematic Reviews and Meta-Analyses" (PRISMA) statement. METHODS: We performed a MEDLINE search with the terms "alcohol" AND "ICU" as well as "alcohol withdrawal" AND "intensive care." All publications that matched our eligibility criteria were analyzed according to our predefined criteria. RESULTS: We identified 6 controlled trials about AWS prevention and 8 about AWS therapy in ICUs. For AWS prevention, benzodiazepines (BZO), ethanol (EtOH), and clonidine were evaluated as single agents, and BZO, clonidine, clomethiazol and haloperidol were studied in drug combinations. All evaluated single agents and combinations were found to be effective for AWS prevention. Clomethiazol was found to be associated with a higher tracheobronchitis rate and thus disadvised for critically ill patients. For AWS therapy, BZO, gamma-hydroxybutyric acid (GHB), and clomethiazol were evaluated in randomized controlled trials as single agents and phenobarbital, clonidine, and haloperidol as adjuncts. All evaluated regimens were found to be effective for AWS therapy. Overall, in the ICU, BZO were found to be superior to GHB and clomethiazol regarding safety and efficacy. Furthermore, 4 cohort trials with historical control groups evaluated the effect of the implementation of a standardized protocol of BZO therapy for AWS in ICUs. All of these 4 studies found better outcome for the intervention groups. CONCLUSIONS: Based on the evidence of this SR, EtOH or BZO can be advised for AWS prevention on ICU patients with alcohol dependence, but EtOH is not allowed for therapy of AWS. AWS therapy should be standardized and based on symptom-triggered BZO administration. Alpha2-agonists and haloperidol should be added for autonomic and productive psychotic symptoms.

Efficacy of emergency department-initiated tobacco control--systematic review and meta-analysis of randomized controlled trials.

AIM: Systematic review and meta-analysis of randomized controlled trials evaluating the efficacy of emergency department-initiated tobacco control (ETC). METHODS: Literature search in 7 databases and gray literature sources. Point prevalence tobacco abstinence at 1-, 3-, 6-, and/or 12-month follow-up was abstracted from each study. The proportionate effect (relative risk) of ETC on tobacco abstinence was calculated separately for each study and follow-up time and pooled, at different follow-up times, by Mantel-Haenszel relative risks. The effects of ETC on combined point prevalence tobacco abstinence across all follow-up times were calculated using generalized linear mixed models. RESULTS: Seven studies with overall 1,986 participants were included. The strongest effect of ETC on point prevalence tobacco abstinence was found at 1 month: Relative risk (RR) = 1.47 (3 studies) (95% confidence interval [CI]: 1.06-2.06), while the effect at 3, 6, and 12 months was RR = 1.24 (6 studies) (95% CI: 0.93-1.65); 1.13 (5 studies) (95% CI: 0.86-1.49); and 1.25 (1 study) (95% CI: 0.91-1.72). The benefit on combined point prevalence tobacco abstinence was RR = 1.33 (7 studies) (95% CI: 0.96-1.83), p = .08; with RR = 1.33 (95% CI: 0.92-1.92), p = .10, for the 5 studies combining motivational interviewing and booster phone calls. CONCLUSIONS: ETC combining motivational interviewing and booster phone calls showed a trend toward increased episodically measured tobacco abstinence up to 12 months. More methodologically rigorous trials are needed to effectively evaluate the impact of ETC.

EEG microstate quantifiers and state space descriptors during anaesthesia in patients with postoperative delirium: a descriptive analysis.

Postoperative delirium is a serious sequela of surgery and surgery-related anaesthesia. One recommended method to prevent postoperative delirium is using bi-frontal EEG recording. The single, processed index of depth of anaesthesia allows the anaesthetist to avoid episodes of suppression EEG and excessively deep anaesthesia. The study data presented here were based on multichannel (19 channels) EEG recordings during anaesthesia. This enabled the analysis of various parameters of global electrical brain activity. These parameters were used to compare microstate topographies under anaesthesia with those in healthy volunteers and to analyse changes in microstate quantifiers and EEG global state space descriptors with increasing exposure to anaesthesia. Seventy-three patients from the Surgery Depth of Anaesthesia and Cognitive Outcome study (SRCTN 36437985) received intraoperative multichannel EEG recordings. Altogether, 720 min of artefact-free EEG data, including 210 min (29.2%) of suppression EEG, were analysed. EEG microstate topographies, microstate quantifiers (duration, frequency of occurrence and global field power) and the state space descriptors sigma (overall EEG power), phi (generalized frequency) and omega (number of uncorrelated brain processes) were evaluated as a function of duration of exposure to anaesthesia, suppression EEG and subsequent development of postoperative delirium. The major analyses involved covariate-adjusted linear mixed-effects models. The older (71 ± 7 years), predominantly male (60%) patients received a median exposure of 210 (range: 75-675) min of anaesthesia. During seven postoperative days, 21 patients (29%) developed postoperative delirium. Microstate topographies under anaesthesia resembled topographies from healthy and much younger awake persons. With increasing duration of exposure to anaesthesia, single microstate quantifiers progressed differently in suppression or non-suppression EEG and in patients with or without subsequent postoperative delirium. The most pronounced changes occurred during enduring suppression EEG in patients with subsequent postoperative delirium: duration and frequency of occurrence of microstates C and D progressed in opposite directions, and the state space descriptors showed a pattern of declining uncorrelated brain processes (omega) combined with increasing EEG variance (sigma). With increasing exposure to general anaesthesia, multiple changes in the dynamics of microstates and global EEG parameters occurred. These changes varied partly between suppression and non-suppression EEG and between patients with or without subsequent postoperative delirium. Ongoing suppression EEG in patients with subsequent postoperative delirium was associated with reduced network complexity in combination with increased overall EEG power. Additionally, marked changes in quantifiers in microstate C and in microstate D occurred. These putatively adverse intraoperative trajectories in global electrical brain activity may be seen as preceding and ultimately predicting postoperative delirium.