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S Rachel Thomas a Department of Neurology, Institute of Neurological
Sciences, Southern General Hospital, Glasgow G51 4TF, b Department of Neurology, Leeds General Infirmary,
Leeds LS1 3EX
Correspondence to: K W Muir k.muir{at}clinmed.gla.ac.uk
Objective:
To compare the ease of use of atraumatic
needles with standard needles for diagnostic lumbar puncture and the
incidence of headache after their use.
Design:
Double blind, randomised controlled trial.
Setting:
Investigation ward of a neurology unit in a
university hospital.
Participants:
116 patients requiring elective
diagnostic lumbar puncture.
Interventions:
Standardised protocol for lumbar
puncture with 20 gauge atraumatic or standard needles.
Outcome measures:
The primary end point was
intention to treat analysis of incidence of moderate to severe
headache, assessed at one week by telephone interview. Secondary end
points were incidence of headache at one week analysed by needle type,
ease of use by operator according to a visual analogue scale, incidence of backache, and failure rate of puncture.
Results:
Valid outcome data were available for 97 of 101 patients randomised. Baseline characteristics were matched except
for higher body mass index in the standard needle group. By an
intention to treat analysis the absolute risk of moderate to severe
headache with atraumatic needles was reduced by 26% (95% confidence
interval 6% to 45%) compared with standard needles, but there was a
non-significantly greater absolute risk of multiple attempts at lumbar
puncture (14%,
4% to 32%). Higher body mass index was associated
with an increased failure rate with atraumatic needles, but the reduced
incidence of headache was maintained. The need for medical
interventions was reduced by 20% (1% to 40%).
Conclusions:
Atraumatic needles significantly reduced
the incidence of moderate to severe headache and the need for medical interventions after diagnostic lumbar punctures, but they were associated with a higher failure rate than standard needles.
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