Questions · Postdural Puncture Headache
8 questions, 0 approved. Approve them one at a time — a quiz shows nothing you have not.
Recall — derived from a kept point
Despite a large evidence base favouring atraumatic needles, the authors note that clinical adoption remains poor. What arguments would you make to a colleague who still reaches for a cutting needle by default?
Answer: The effect is large and was measured across 110 trials from 29 countries, with the incidence falling from 11.0% to 4.2% and a relative risk of 0.40 (95% CI 0.34-0.47). Heterogeneity was moderate at I² 45.4%, which is unsurprising given the range of indications and eras included, but the direction was consistent and the result highly significant. The authors note adoption remains poor despite this. If a colleague raises a higher failure or repeat-attempt rate as the counterargument, that is worth discussing on its own evidence — this review's finding is specifically about headache incidence.
Moderate heterogeneity affects how precisely you quote a number, not whether you believe the direction.
Source claim: Atraumatic needles have been proposed to lower complication rates after lumbar puncture, yet several surveys indicate that clinical adoption of these needles remains poor, despite a reduction in postdural puncture headache from 11.0% to 4.2% across 110 trials.
Nath et al., Atraumatic versus conventional lumbar puncture needles: a systematic review and meta-analysis, Lancet 2018
recall · CA-1 · phrased by llm
The meta-analysis reported I² of about 45% for the primary outcome. What does that level of heterogeneity mean for the strength of the conclusion?
Answer: It indicates moderate heterogeneity — the 110 trials, spanning 1989 to 2017 and 29 countries, did not all produce the same effect size. That is unsurprising given the range of indications and eras included. It does not overturn the pooled result, but it does mean the 11.0% and 4.2% figures should be read as pooled estimates across varied populations rather than as the rates to quote for a specific patient and needle gauge.
Moderate heterogeneity affects how precisely you quote a number, not whether you believe the direction.
Source claim: The pooled reduction in postdural puncture headache with atraumatic needles had an I² of 45.4%, across 110 trials done between 1989 and 2017 from 29 countries.
Nath et al., Atraumatic versus conventional lumbar puncture needles: a systematic review and meta-analysis, Lancet 2018
recall · CA-2 · phrased by llm
Accidental dural puncture (ADP) during epidural blood patch (EBP) may occur in 0.5-___% of cases.
Answer: 1
Accidental dural puncture (ADP) during epidural blood patch (EBP) may occur in 0.5-1% of cases.
Accidental dural puncture during epidural blood patch: a narrative review · PMID 37302183
recall · CA-2 · phrased by derived
The point with one number taken out. No model wrote any of this: the stem is the sentence you reviewed, minus a digit, and the paper it came from is named beneath it.
Open prompts
How does your plan change if the patient is not optimised?
open · CA-2 · phrased by derived
What is the physiology behind what we just did?
open · CA-2 · phrased by derived
Talk me through the trade-off you made there.
open · CA-2 · phrased by derived
What would make you abandon this plan and do something else?
open · CA-2 · phrased by derived
Questions only — nothing here asserts anything, which is why a model is allowed to phrase them. Where no model was reachable these are the level defaults.