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Created May 21, 2015, last updated almost 2 years ago.
Collection: 19, Score: 2466, Trend score: 0, Read count: 2692, Articles count: 14, Created: 2015-05-21 04:22:48 UTC. Updated: 2022-05-17 02:24:59 UTC.Notes
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Collected Articles
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A brief review of post-operative delirium and post-operative cognitive decline, the possibility that anaesthesia and surgery may contribute (though for which evidence is observational and low quality), and potential methods for detection, quantification and avoidance.
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J Neurosurg Anesthesiol · Jan 2013
Randomized Controlled TrialBIS-guided anesthesia decreases postoperative delirium and cognitive decline.
BIS use in elderly patients targeting a BIS of 40-60 may reduce post-operative delirium and post-operative cognitive decline at 3 months.
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Randomized Controlled Trial Multicenter Study
Monitoring depth of anaesthesia in a randomized trial decreases the rate of postoperative delirium but not postoperative cognitive dysfunction.
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Delirium presents clinically with differing subtypes ranging from hyperactive to hypoactive. The clinical presentation is not clearly linked to specific pathophysiological mechanisms. Nevertheless, there seem to be different mechanisms that lead to delirium; for example the mechanisms leading to alcohol-withdrawal delirium are different from those responsible for postoperative delirium. ⋯ Well documented predisposing factors are age, medical comorbidities, cognitive, functional, visual and hearing impairment and institutional residence. Important precipitating factors apart from surgery are admission to an ICU, anticholinergic drugs, alcohol or drug withdrawal, infections, iatrogenic complications, metabolic derangements and pain. Scores to predict the risk of delirium based on four or five risk factors have been validated in surgical patients.
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To target pharmacological prevention, instruments giving an approximation of an individual patient's risk of developing postoperative delirium are available. In view of the variable clinical presentation, identifying patients in whom prophylaxis has failed (that is, who develop delirium) remains a challenge. Several bedside instruments are available for the routine ward and ICU setting. ⋯ Currently, cholinesterase inhibitors cannot be recommended and the data on dexmedetomidine are inconclusive. With the exception of alcohol-withdrawal delirium, there is no role for benzodiazepines in the treatment of delirium. It is unclear whether treating delirium prevents long-term sequelae.
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Minerva anestesiologica · Jul 2011
ReviewPostoperative delirium and postoperative cognitive dysfunction in the elderly - what are the differences?
Postoperative cognitive impairment is an increasingly common problem as more elderly patients undergo major surgery. Cognitive deficits in the postoperative period cause severe problems and are associated with a marked increase in morbidity and mortality. ⋯ Both have multifactorial pathogenesis but differ in numerous other ways, with delirium being well-defined and acute in onset and postoperative cognitive dysfunction (POCD) being subtler and with longer duration. This review aims to provide an overview of the differences in the diagnosis of the two entities and to illustrate the methodological problems that can be encountered when evaluating cognitive deficits postoperatively.
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Postoperative delirium often remains undiagnosed and therefore untreated. The purpose of this continuing professional development module is to identify patients at high risk of developing delirium following non-cardiac surgery and to provide tools to aid in the diagnosis of delirium at the bedside. Optimal prevention and treatment strategies are recommended. ⋯ Delirium is a serious condition that must be recognized early and treated promptly to minimize deleterious outcomes. In order to institute prevention strategies and treat the condition effectively when it occurs, the anesthesiologist must be vigilant in identifying patients at risk and in screening for this condition.
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Randomized Controlled Trial Multicenter Study Retracted Publication
A multicentre randomised controlled trial of the effect of intra-operative dexmedetomidine on cognitive decline after surgery.
Dexmedetomidine may reduce post-operative delirium and at one month post-operative cognitive decline in elderly patients, associated with changes in brain-derived neurotrophic factor.
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Cochrane Db Syst Rev · Aug 2018
Review Meta AnalysisIntravenous versus inhalational maintenance of anaesthesia for postoperative cognitive outcomes in elderly people undergoing non-cardiac surgery.
The use of anaesthetics in the elderly surgical population (more than 60 years of age) is increasing. Postoperative delirium, an acute condition characterized by reduced awareness of the environment and a disturbance in attention, typically occurs between 24 and 72 hours after surgery and can affect up to 60% of elderly surgical patients. Postoperative cognitive dysfunction (POCD) is a new-onset of cognitive impairment which may persist for weeks or months after surgery.Traditionally, surgical anaesthesia has been maintained with inhalational agents. End-tidal concentrations require adjustment to balance the risks of accidental awareness and excessive dosing in elderly people. As an alternative, propofol-based total intravenous anaesthesia (TIVA) offers a more rapid recovery and reduces postoperative nausea and vomiting. Using TIVA with a target controlled infusion (TCI) allows plasma and effect-site concentrations to be calculated using an algorithm based on age, gender, weight and height of the patient.TIVA is a viable alternative to inhalational maintenance agents for surgical anaesthesia in elderly people. However, in terms of postoperative cognitive outcomes, the optimal technique is unknown. ⋯ We are uncertain whether maintenance with propofol-based TIVA or with inhalational agents affect incidences of postoperative delirium, mortality, or length of hospital stay because certainty of the evidence was very low. We found low-certainty evidence that maintenance with propofol-based TIVA may reduce POCD. We were unable to perform meta-analysis for intraoperative hypotension or length of stay in the PACU because of heterogeneity between studies. We identified 11 ongoing studies from clinical trials register searches; inclusion of these studies in future review updates may provide more certainty for the review outcomes.
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Anesthesia and analgesia · Aug 2020
Comparative Study Observational StudyAnesthesia With and Without Nitrous Oxide and Long-term Cognitive Trajectories in Older Adults.
Although exposure to surgery/anesthesia is associated with a small cognitive decline among the elderly, there is no impact from the presence or absence of nitrous oxide.
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Randomized Controlled Trial Comparative Study Pragmatic Clinical Trial
Effect of Electroencephalography-Guided Anesthetic Administration on Postoperative Delirium Among Older Adults Undergoing Major Surgery: The ENGAGES Randomized Clinical Trial.
Intraoperative electroencephalogram (EEG) waveform suppression, often suggesting excessive general anesthesia, has been associated with postoperative delirium. ⋯ Among older adults undergoing major surgery, EEG-guided anesthetic administration, compared with usual care, did not decrease the incidence of postoperative delirium. This finding does not support the use of EEG-guided anesthetic administration for this indication.
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Meta Analysis
Processed Electroencephalogram Monitoring and Postoperative Delirium: A Systematic Review and Meta-analysis.
Use of processed-EEG monitoring to guide anaesthesia depth is associated with a 38% odds reduction of developing postoperative delirium.
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Anesthesia and analgesia · Feb 2022
Cognitive Recovery by Decade in Healthy 40- to 80-Year-Old Volunteers After Anesthesia Without Surgery.
Postoperative delirium and postoperative cognitive dysfunction are the most common complications for older surgical patients. General anesthesia may contribute to the development of these conditions, but there are little data on the association of age with cognitive recovery from anesthesia in the absence of surgery or underlying medical condition. ⋯ Recovery of cognitive function to baseline was rapid and did not differ between age decades of participants, although the number in each decade was small. These results suggest that anesthesia alone may not be associated with cognitive recovery in healthy adults of any age decade.
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Randomized Controlled Trial Multicenter Study Comparative Study Pragmatic Clinical Trial
Effect of Regional vs General Anesthesia on Incidence of Postoperative Delirium in Older Patients Undergoing Hip Fracture Surgery: The RAGA Randomized Trial.
In adults undergoing hip fracture surgery, regional anesthesia may reduce postoperative delirium, but there is uncertainty about its effectiveness. ⋯ In patients aged 65 years and older undergoing hip fracture surgery, regional anesthesia without sedation did not significantly reduce the incidence of postoperative delirium compared with general anesthesia.
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