Braun Stimuplex HNS 11 HNS 11 Bedienungsanleitung PDF herunterladen (Seite 22)

If the two values coincide, the total resistance is acceptable

(impedance test) and the electric circuit is satisfactory. If the

actual value is less than the set value, this indicates that the

electrical resistance in the external circuit is too high. The cause

must be found e.g. adhesive electrode too dry, skin resistance

too high, broken cable.

After the impedance test, leave in the mA

position (current

flowing at the tip of the needle indicated and a + sign in front

of the current displayed) until the block is successful.

9. Set an actual current of approx. 1 to 2 mA and advance the

needle further until the first muscles supplied by contractions

occur in the nerve sought. Then, while reducing the current,

advance the needle to the nerve until the recommanded thres-

hold current. (For values see, for example, literature references

4, 7). The threshold current to be achieved depends on the pulse

width and the geometry of the conductive tip of the needle.

Warning! When using Stimuplex

or Contiplex

needles, it must

be noted that muscular contractions with a current of 0.2 to

0.5 mA and a stimulus duration of 0.1 ms - with a current of

0.05 to 0.2 mA and a stimulus duration of 1.0 ms - indicate

satisfactory proximity to the nerve sought. Any further reduc-

tion in the ”threshold currents” may cause direct contact of

the needle with the nerve, resulting in the danger of a me-

chanical nerve lesion.

If needles from other manufacturers are used, the threshold

currents may be much higher. You would have to work out

these yourself.

10. After clearly visible muscular contractions are seen using the

desired threshold current, inject local anaesthetic.

The response to the electrical stimulation will reduce or disap-

pear within a few seconds after an injection of 2 - 3 ml. If this

effect is not definite, do not continue to search for the nerve

at the same location. For safety reasons, a more peripheral site

should be used.

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Braun Stimuplex HNS 11 HNS 11 Bedienungsanleitung Seite 22