Current opinion in anaesthesiology
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Curr Opin Anaesthesiol · Oct 2011
ReviewUltrasound brachial plexus anesthesia and analgesia for upper extremity surgery: essentials of our current understanding, 2011.
Ultrasound-guidance is gaining tremendous popularity. There is growing evidence of value with emphasis on clinical relevance, but can ultrasound-guidance scientifically warrant changing the practice of upper extremity regional? The literature is searched to describe findings where ultrasound may reduce complication rates, reduce block performance times, and improve block efficacy and quality. ⋯ Intraepineurial injection requires additional investigation. Conclusions have suggested reducing typical volumes (40 ml) of local with ultrasound-directed upper extremity blockade. Increased use of perineural catheters is being advocated for prolonged analgesia, but risk-to-benefit consequences need to always be considered.
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Curr Opin Anaesthesiol · Oct 2011
ReviewLocal anesthetic systemic toxicity: update on mechanisms and treatment.
With increases in use of regional anesthesia, local anesthetic systemic toxicity (LAST) has been a topic of interest and debate. Despite many years of research, the exact cause and best treatment of LAST (particularly local anesthetic cardiotoxicity) remain unclear. This review will summarize what is known and what remains uncertain about LAST and its treatment, including information published in the past 12-18 months. ⋯ Regarding mechanism(s) of LAST, the evidence remains mixed, but it is likely that local anesthetic cardiotoxicity primarily arises from a blockade of sodium channels. As for treatment, in addition to ventilation, oxygenation, and chest compressions, lipid emulsion therapy should be a primary element in the treatment of cardiovascular LAST. The use of epinephrine and vasopressin should be tailored to specifics of an episode of LAST, and doses should be kept as low as possible while still achieving the desired effects.
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Curr Opin Anaesthesiol · Oct 2011
ReviewInfluence of anesthesia on cerebral blood flow, cerebral metabolic rate, and brain functional connectivity.
To describe recent studies exploring brain function under the influence of hypnotic anesthetic agents, and their implications on the understanding of consciousness physiology and anesthesia-induced alteration of consciousness. ⋯ Accumulating evidence suggests that hypnotic anesthetic agents disrupt large-scale cerebral connectivity. This would result in an inability of the brain to generate and integrate information, while external sensory information is still processed at a lower order of complexity.
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Deep brain stimulation (DBS) is a well accepted treatment modality for many movement disorders such as Parkinson's disease and an increasing number of other functional neurological disorders like dystonias and epilepsy. This review will highlight the recent developments in our knowledge regarding the effects of anesthetic agents on neurophysiologic recording and anesthetic management of patients undergoing the insertion of a DBS. ⋯ There will continue to be an increase in the use of DBS for many neurological and functional disorders, especially in the aging baby boomer population. Anesthetic technique will vary depending on the prevalent practice in individual institutions and requirements of the specific surgical procedure.
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The persistence of pain after surgical procedure or trauma has become a major focus of interest and its prevention now represents a challenge as an indicator of quality of healthcare. The only way to develop effective strategies to prevent the development of chronic pain is to better understand the mechanisms involved in the progression from acute to chronic pain, with the aim to target high-risk patients and to adapt perioperative management. ⋯ A dynamic view of both physiological and psychological response of an individual after injury (trauma, surgery) should improve our ability to target predisposed patients who might develop persistent pain. We should then be more able to provide those patients with the most appropriate preventive management.