Anesthesia, essays and researches
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Monitored anesthesia care (MAC) combines intravenous sedation along with local anesthetic infiltration or nerve block. Several drugs have been used for MAC, but all are associated with complications. Dexmedetomidine is a selective α2-adrenoceptor agonist with both sedative and analgesic properties and is devoid of respiratory depressant effects. Its short elimination half-life makes it an attractive agent for sedation during MAC. ⋯ During MAC dexmedetomidine provides better sedation and analgesia than midazolam.
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Anesthetic agents should be chosen not only on the basis of safety-efficacy profile, but also on the economic aspect. Propofol and sevoflurane are commonly utilized anesthetic agent for general anesthesia. ⋯ We conclude that sevoflurane appears to be better anesthetic agents in terms of cost-effectiveness and recovery profile.
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Infraclavicular brachial block with coracoids approach has gained popularity because of consistent bony landmarks and less chances of vascular puncture and pneumothorax. ⋯ Addition of clonidine to bupivacaine lead to early onset and prolonged duration of sensory and motor block with prolonged analgesia as compared to the addition of clonidine to ropivacaine.
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The sparing of ulnar nerve often leads to the failure of the upper limb blockade. It has been claimed that local anesthetic injection at the site of stimulator evoked finger flexion response is associated with highest success rate of a successful block. The lower trunk stimulation of plexus should yield similar results as this trunk contributes significantly for median and ulnar nerves of hand and forearm. ⋯ We conclude other than finger flexion, the wrist flexion the forearm twitches, pronation and wrist adduction may be used for lower trunk blockade and thus for higher accuracy.
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Case Reports
Obstruction of a non-resterilized reinforced endotracheal tube during craniotomy under general anesthesia.
Many cases of reinforced endotracheal tube (ETT) obstruction were reported in the literature. In most of these cases, the obstruction was related to the use of a resterilized tube with or without the use of nitrous oxide (N2O). Resterilization and autoclaving of the tube may result in dissection or formation of a bleb between the two layers of the tube that may expand after the use of N2O. We describe a case of acute non-resterilized reinforced ETT obstruction, by bleb formation, during occipital craniotomy under general anesthesia.