Anesthesiology
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Factors influencing quality of recovery in cranial and spinal neurosurgical patients are not known, possibly because of lack of a suitable instrument. Therefore, the authors measured quality of recovery using the QoR-40 score (a 40-item questionnaire on quality of recovery from anesthesia). ⋯ The QoR-40 score is a useful instrument with which to assess quality of recovery in cranial and spinal surgery patients. Postoperative pain and neurologic deficits correlate with poor quality of recovery in these patients.
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Randomized Controlled Trial Comparative Study Clinical Trial
Efficacy, safety, and pharmacokinetics of levobupivacaine with and without fentanyl after continuous epidural infusion in children: a multicenter trial.
Levobupivacaine, the levo-enantiomer of bupivacaine, is as potent as bupivacaine but less toxic. Therefore, the authors investigated the efficacy, safety, and pharmacokinetics of perioperative epidural levobupivacaine with and without fentanyl in children. ⋯ We conclude that 0.0625% levobupivacaine without fentanyl is an effective perioperative epidural solution in children when infused at a rate of 0.3 ml. kg-1. h-1. The plasma concentrations of 0.125% and 0.0625% levobupivacaine and fentanyl (1 mug/ml) at the end of a 24-h infusion are low.
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The adjustment of local anesthetic dosage for peripheral nerve block must meet two basic requirements: a drug concentration sufficient to inhibit Na+ channels to the point of impulse failure and a volume of drug sufficient to expose a length of nerve longer than the "critical length" for propagation failure. This study examines the lidocaine dosage requirement, in milligrams, for functionally assayed sciatic nerve block in the rat using a fourfold range of volume corresponding to concentrations from 2 to 7 mg/ml and compares these blocks with the intraneural lidocaine content after injection of equipotent doses. ⋯ Blocks of greater depth and longer duration result from injection of smaller volumes and, correspondingly, higher lidocaine concentrations containing the same dose. The corollary is that lower lidocaine doses are required to achieve the same effect when smaller volumes are injected. Curiously, when the equivalent E50 is injected, total drug taken into the nerve is less from the smaller volumes than from the larger volumes, even though the peak functional effects are equal. Total intraneural local anesthetic may not represent the effective drug in the compartment that contains nerve axons, the actual location of neural blockade.
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In critical illness, the gut is susceptible to hypoperfusion and hypoxia. Positive-pressure ventilation can affect systemic hemodynamics and regional blood flow distribution, with potentially deleterious effects on the intestinal circulation. The authors hypothesized that spontaneous breathing (SB) with airway pressure release ventilation (APRV) provides better systemic and intestinal blood flow than APRV without SB. ⋯ Maintaining SB during APRV was associated with better systemic and intestinal blood flows. Improvements were more pronounced in the mucosal-submucosal layer.