Regional-Anaesthesie
-
Regional-Anaesthesie · Sep 1990
Randomized Controlled Trial Clinical Trial[No effect of injection volume on sensory and motor blockade in isobaric spinal anesthesia].
The authors were interested to find whether the course of sensory and motor blockade in isobaric spinal anesthesia was determined by the dose or the volume of the anesthetic agent. In a randomized double-blind study in 60 patients, each underwent isobaric spinal anesthesia with 17.5 mg bupivacaine. In three groups of 20 patients, this dose was administered as 3.5 mg bupivacaine 0.5%, 7 ml bupivacaine 0.25% or 10 ml bupivacaine 0.175%. ⋯ The rate of development, the maximal spread or intensity, and the regression of sensory and motor blockade did not differ in the three groups. The only difference was that the complete regression was shorter following 10 ml bupivacaine 0.175% (P less than 0.05). It is therefore concluded that the dose, and not the volume, determines the course of sensory and motor blockade of isobaric spinal anesthesia.
-
Regional-Anaesthesie · Sep 1990
[The effect of injection speed and needle gauge on the spread of sensory blockade in spinal anesthesia].
Unanimity has not yet been reached on the influence of injection speed and needle size on the spread of sensory blockade in spinal anesthesia. While McClure et al. [6] proved that a change in injection speed had no effect on the spread of the blockade, Lanz et al. [4] showed in their investigation that increasing injection speed increases the spread of the blockade. The influence of needle size has hardly been investigated so far. ⋯ No direct relation could be proved between the different injection speeds and the spread of the blockade. Our results are hardly comparable with those of other investigators, since other groups have used different local anesthetics or performed investigations in vitro. The use of large spinal needles is associated with spread of the spinal block to a significantly higher level than is achieved with thinner needles.(ABSTRACT TRUNCATED AT 400 WORDS)