Current opinion in anaesthesiology
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Curr Opin Anaesthesiol · Jun 2006
ReviewImaging techniques for regional nerve blockade and vascular cannulation in children.
Many regional anaesthesia techniques as well as central venous access in paediatric patients are still described insufficiently. This review article describes the basics in small part ultrasonography and highlights new developments in ultrasonographic-guided regional anaesthetic techniques and vascular access. ⋯ Regional anaesthesia and vascular access under ultrasonographic guidance offers significant advantages and improved safety. Additional education and hand skills, extensive experience and adequate equipment are necessary for the effective implementation of these methods in the daily clinical practice.
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Curr Opin Anaesthesiol · Jun 2006
ReviewThe use of neuraxial adjuvant drugs (neostigmine, clonidine) in obstetrics.
Neuraxial adjuvant drugs are used to improve analgesia and to decrease complications associated with a high dose of a single drug. Opioids are used in routinely, but alpha2-agonists, such as clonidine or cholinesterase inhibitors (neostigmine), have also been used for labour analgesia or to relieve pain following caesarean section. Both drugs possess a common mechanism of action that can be beneficial. ⋯ Co-administration of neuraxial drugs may enhance analgesia and reduce the side effects of each drug. Clonidine and neostigmine may be used in obstetrics, under some conditions.
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Historically, ephedrine has been recommended as the best vasopressor in obstetrics because animal studies showed it caused less reduction in uterine blood flow compared with alpha-agonists. Recent clinical evidence, however, suggests that this is not as important as initially thought. This review evaluates current data with a focus on spinal anesthesia for cesarean section. ⋯ When current evidence is considered, in the authors' opinion, phenylephrine is the vasopressor that most closely meets the criteria for the best vasopressor in obstetrics.
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Curr Opin Anaesthesiol · Jun 2006
ReviewRecent developments in the perioperative fluid management for the paediatric patient.
Maintenance fluid therapy represents the volume of fluids and amount of electrolytes and glucose needed to replace anticipated physiological losses from breath, sweat and urine and to prevent hypoglycaemia. For 50 years, this therapy was based on Holliday and Segar's formula, which proposed to match children's water and electrolyte requirements on a weight-based calculation using hypotonic solutions. Recent publications highlight the risk of hyponatraemia in the postoperative period and the facilitating role of a hypotonic infusion, leading some people to recommend replacing hypotonic with isotonic solutions. ⋯ As free water excretion is altered for all children in the postoperative period, it is necessary to reduce the volume of maintenance fluid therapy to half the previously recommended volume. The choice of an isotonic solution should be more pertinent to that of a hypotonic solution, but evidence is lacking for a definitive answer.
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There are still many controversies about perioperative management of hypertensive patients. This review aims to provide relevant instruction based on evidence regarding the treatment of those patients. ⋯ Delaying surgery only for the purpose of blood pressure control may not be necessary, especially in the case of mild to moderate hypertension. Strict care, however, should be taken to ensure perioperative hemodynamic stability because labile hemodynamics, rather than preoperative hypertension per se, appears to be more closely associated with adverse cardiovascular complications. Delaying surgery in hypertensive patients may be justified if target organ damage exists that can be improved by such a delay or if (suspected) target organ damage should be evaluated further before the operation.