Articles: nerve-block.
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A case of respiratory failure following postoperative intercostal nerve blockade is described. A possible mechanism is postulated and the evidence in favour of intercostal blockade in patients with chronic airways disease is questioned. The need for caution when managing such patients with regional blockade is emphasised.
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Regional-Anaesthesie · Apr 1984
[The popliteo-femoral block, a rarely used form of regional anesthesia. With special reference to the use of peripheral nerve stimulators].
Blockade of the sciatic nerve in the fossa poplitea is a rarely used form of regional anaesthesia. A new method of identification of the tibial and peroneal nerve and their blockade in combination with blockade of the femoral nerve using a peripheral nerve stimulator, is described. Results in 300 patients during a 12 month period are described and discussed.
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The exact role of calcium in nerve conduction in neurons that have been blocked by local anesthetics remains controversial. Recently, attention has been drawn to the importance of examining both frequency-dependent and nonfrequency-dependent conduction block, since it is felt that frequency-dependent block provides a model that more closely approximates the normal physiologic state. The present study was designed to examine the effects of calcium on both the nonfrequency-dependent and frequency-dependent components of lidocaine nerve block. ⋯ Compound action potentials were measured, and both frequency-dependent block and nonfrequency-dependent block were compared in each solution. Low calcium concentrations significantly enhanced both nonfrequency- and frequency-dependent lidocaine block. The effect of low concentrations of calcium was greater at higher frequencies of stimulation.