Questions · ICP managment
31 questions, 0 approved. Approve them one at a time — a quiz shows nothing you have not.
Recall — derived from a kept point
A systematic review restricted to randomised trials published from 2000 onwards pooled 10 trials in 760 patients comparing hypertonic saline with other intracranial-pressure-lowering agents in traumatic brain injury, with the six-month Glasgow Outcome Scale as its primary outcome. What did it find, and what harm did it identify?
Answer: It found no evidence of an effect on any clinically important outcome. Glasgow Outcome Scale at six months showed no difference (risk ratio 0.82, 95% CI 0.48 to 1.40), nor did all-cause mortality (risk ratio 0.96, 95% CI 0.60 to 1.55) or total length of stay. The point estimate for uncontrolled intracranial pressure favoured hypertonic saline but did not reach significance (risk ratio 0.52, 95% CI 0.26 to 1.04). The harm identified was hypernatraemia, roughly twice as common with hypertonic saline (risk ratio 2.13, 95% CI 1.09 to 4.17). Most of the included trials were at unclear or high risk of bias and the evidence was rated low to very low certainty.
Set this beside the earlier meta-analyses and the shape of the evidence becomes clear: hypertonic saline moves intracranial pressure and cerebral perfusion pressure in some trials and at some time points, has never been shown to change six-month outcome, and carries a measurable sodium cost. This review is the most conservative of the three — here even the reduction in uncontrolled intracranial pressure did not reach statistical significance, on low to very low certainty evidence. That is enough to justify keeping it in the algorithm and not enough to justify claiming it is better.
Source claim: Pooling 10 randomised trials with 760 patients comparing hypertonic saline with other intracranial-pressure-lowering agents in traumatic brain injury, there was no evidence of an effect on six-month Glasgow Outcome Scale (risk ratio 0.82, 95% CI 0.48-1.40), all-cause mortality (risk ratio 0.96, 95% CI 0.60-1.55) or length of stay, the reduction in uncontrolled intracranial pressure was not statistically significant (risk ratio 0.52, 95% CI 0.26-1.04), and hypertonic saline was associated with hypernatraemia (risk ratio 2.13, 95% CI 1.09-4.17) on low to very low certainty evidence.
Bernhardt K et al., Hypertonic Saline Versus Other Intracranial-Pressure-Lowering Agents for Patients with Acute Traumatic Brain Injury: A Systematic Review and Meta-analysis, Neurocrit Care 2024
recall · CA-2 · phrased by llm
A meta-analysis with trial sequential analysis pooled 12 randomised trials in 464 patients comparing hypertonic saline with mannitol for raised intracranial pressure after traumatic brain injury. Contrast what it found for the physiological endpoints with what it found for patient-centred outcomes, and say what the trial sequential analysis added.
Answer: The physiological endpoints favoured hypertonic saline, but only after a delay: intracranial pressure was no different at 30 to 60 minutes (mean difference -0.19 mmHg) and significantly lower after hypertonic saline at 90 to 120 minutes (mean difference -2.33 mmHg, 95% CI -3.17 to -1.50). Cerebral perfusion pressure was higher after hypertonic saline at both windows, by 5.48 and 9.08 mmHg. The patient-centred outcomes showed nothing: mortality did not differ (relative risk 0.69, 95% CI 0.45 to 1.04) and neither did favourable neurological outcome (relative risk 1.28, 95% CI 0.86 to 1.90). The trial sequential analysis added the crucial qualifier — the accumulated number of patients is insufficient to make reliable statements about long-term outcome, so the absence of an outcome difference here is an underpowered result rather than a demonstrated equivalence.
A drug that lowers the number on the monitor has not yet been shown to change what happens to the patient. Trial sequential analysis is the tool that tells you whether "no difference" has actually been tested or merely not yet observed.
Source claim: Pooling 12 randomised trials with 464 patients comparing hypertonic saline with mannitol for raised intracranial pressure after traumatic brain injury, there was no significant difference in mortality (relative risk 0.69, 95% CI 0.45-1.04) or favourable neurological outcome (relative risk 1.28, 95% CI 0.86-1.90), no difference in intracranial pressure at 30-60 minutes (mean difference -0.19 mmHg) but significantly lower intracranial pressure after hypertonic saline at 90-120 minutes (mean difference -2.33 mmHg, 95% CI -3.17 to -1.50) and higher cerebral perfusion pressure at both intervals (5.48 and 9.08 mmHg), with trial sequential analysis showing the number of cases insufficient for reliable statements on long-term outcomes.
Schwimmbeck F et al., Hypertonic Saline Versus Mannitol for Traumatic Brain Injury: A Systematic Review and Meta-analysis With Trial Sequential Analysis, J Neurosurg Anesthesiol 2021
recall · CA-2 · phrased by llm
Maintain intracranial pressure at 20 mm Hg or lower in severe traumatic brain injury, but adding brain tissue oxygen pressure monitoring to keep above ___ mm Hg does not reduce poor neurological outcome and increases catheter-related intracerebral haematoma risk.
Answer: 20
Maintain intracranial pressure at 20 mm Hg or lower in severe traumatic brain injury, but adding brain tissue oxygen pressure monitoring to keep above 20 mm Hg does not reduce poor neurological outcome and increases catheter-related intracerebral haematoma risk.
Intracranial pressure monitoring with and without brain tissue oxygen pressure monitoring for severe traumatic brain injury in France (OXY-TC): an open-label, randomised controlled superiority trial · PMID 37863590
recall · CA-2 · phrased by derived
Maintain systolic blood pressure lower than ___ mm Hg in most patients with ADPKD, of whom 9% to 14% develop intracranial aneurysms.
Answer: 120
Maintain systolic blood pressure lower than 120 mm Hg in most patients with ADPKD, of whom 9% to 14% develop intracranial aneurysms.
Autosomal Dominant Polycystic Kidney Disease: A Review · PMID 40126492
recall · CA-2 · phrased by derived
In traumatic brain injury, intracranial pressure monitor placement after 4 or ___ hours does not significantly increase mortality or intensive care unit length of stay.
Answer: 6
In traumatic brain injury, intracranial pressure monitor placement after 4 or 6 hours does not significantly increase mortality or intensive care unit length of stay.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
In severe traumatic brain injury, maintain intracranial pressure at ___ mm Hg or lower, since adding brain tissue oxygen monitoring did not reduce poor neurological outcome and increased intracerebral haematoma related to the catheter.
Answer: 20
In severe traumatic brain injury, maintain intracranial pressure at 20 mm Hg or lower, since adding brain tissue oxygen monitoring did not reduce poor neurological outcome and increased intracerebral haematoma related to the catheter.
Intracranial pressure monitoring with and without brain tissue oxygen pressure monitoring for severe traumatic brain injury in France (OXY-TC): an open-label, randomised controlled superiority trial · PMID 37863590
recall · CA-2 · phrased by derived
In traumatic brain injury patients requiring intracranial pressure therapy, targeting cerebral perfusion pressure within ___ mm Hg of the autoregulation-guided optimal value is feasible and safe, with 46.5% of monitored time in target range and no increased therapeutic intensity.
Answer: 5
In traumatic brain injury patients requiring intracranial pressure therapy, targeting cerebral perfusion pressure within 5 mm Hg of the autoregulation-guided optimal value is feasible and safe, with 46.5% of monitored time in target range and no increased therapeutic intensity.
Targeting Autoregulation-Guided Cerebral Perfusion Pressure after Traumatic Brain Injury (COGiTATE): A Feasibility Randomized Controlled Clinical Trial · PMID 34407385
recall · CA-2 · phrased by derived
In traumatic brain injury, delaying intracranial pressure monitoring beyond 4 or ___ hours does not significantly increase mortality, hospital length of stay, or intensive care unit length of stay.
Answer: 6
In traumatic brain injury, delaying intracranial pressure monitoring beyond 4 or 6 hours does not significantly increase mortality, hospital length of stay, or intensive care unit length of stay.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
In severe traumatic brain injury, maintain intracranial pressure below ___ mm Hg and brain tissue oxygenation above 20 mm Hg when both monitors are used.
Answer: 22
In severe traumatic brain injury, maintain intracranial pressure below 22 mm Hg and brain tissue oxygenation above 20 mm Hg when both monitors are used.
Brain Oxygen Optimization in Severe Traumatic Brain Injury (BOOST-3): a multicentre, randomised, blinded-endpoint, comparative effectiveness study of brain tissue oxygen and intracranial pressure monitoring versus intracranial pressure alone · PMID 35273066
recall · CA-2 · phrased by derived
In traumatic brain injury, intracranial pressure monitor placement within 4 or ___ hours shows no significant mortality or intensive care unit length of stay advantage over delayed placement.
Answer: 6
In traumatic brain injury, intracranial pressure monitor placement within 4 or 6 hours shows no significant mortality or intensive care unit length of stay advantage over delayed placement.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
In traumatic brain injury, intracranial pressure monitor placement before or after four or six hours demonstrates no significant mortality difference, with relative risk 0.98 and ___% confidence interval 0.56 to 1.71.
Answer: 95
In traumatic brain injury, intracranial pressure monitor placement before or after four or six hours demonstrates no significant mortality difference, with relative risk 0.98 and 95% confidence interval 0.56 to 1.71.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
Out-of-hospital tranexamic acid ___ g bolus plus 1 g infusion or 2 g bolus alone within 2 hours did not significantly reduce progression of intracranial hemorrhage compared with placebo in moderate or severe traumatic brain injury.
Answer: 1
Out-of-hospital tranexamic acid 1 g bolus plus 1 g infusion or 2 g bolus alone within 2 hours did not significantly reduce progression of intracranial hemorrhage compared with placebo in moderate or severe traumatic brain injury.
Effect of Out-of-Hospital Tranexamic Acid vs Placebo on 6-Month Functional Neurologic Outcomes in Patients With Moderate or Severe Traumatic Brain Injury · PMID 32897344
recall · CA-2 · phrased by derived
In traumatic brain injury, a 4- or ___-hour cutoff for early versus late ICP monitor placement yields no significant difference in mortality or hospital and ICU length of stay.
Answer: 6
In traumatic brain injury, a 4- or 6-hour cutoff for early versus late ICP monitor placement yields no significant difference in mortality or hospital and ICU length of stay.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
Decompressive craniectomy for refractory traumatic intracranial pressure above ___ mm Hg reduces median time above that threshold from 17.0 hours to 5.0 hours but increases adverse events from 9.2% to 16.3%.
Answer: 25
Decompressive craniectomy for refractory traumatic intracranial pressure above 25 mm Hg reduces median time above that threshold from 17.0 hours to 5.0 hours but increases adverse events from 9.2% to 16.3%.
Trial of Decompressive Craniectomy for Traumatic Intracranial Hypertension · PMID 27602507
recall · CA-2 · phrased by derived
Intracranial pressure exceeding ___ mm Hg defines refractory intracranial hypertension, and decompressive craniectomy reduces median hours above this threshold from 17.0 to 5.0 but increases adverse events from 9.2% to 16.3% without improving rates of moderate disability or good recovery.
Answer: 25
Intracranial pressure exceeding 25 mm Hg defines refractory intracranial hypertension, and decompressive craniectomy reduces median hours above this threshold from 17.0 to 5.0 but increases adverse events from 9.2% to 16.3% without improving rates of moderate disability or good recovery.
Trial of Decompressive Craniectomy for Traumatic Intracranial Hypertension · PMID 27602507
recall · CA-2 · phrased by derived
In traumatic brain injury with refractory intracranial pressure above ___ mm Hg, decompressive craniectomy reduces median hours of ICP elevation from 17.0 to 5.0 but increases adverse events from 9.2% to 16.3%.
Answer: 25
In traumatic brain injury with refractory intracranial pressure above 25 mm Hg, decompressive craniectomy reduces median hours of ICP elevation from 17.0 to 5.0 but increases adverse events from 9.2% to 16.3%.
Trial of Decompressive Craniectomy for Traumatic Intracranial Hypertension · PMID 27602507
recall · CA-2 · phrased by derived
Manage severe traumatic brain injury in the first ___ hours with sedation and analgesia, intracerebral monitoring, cerebral perfusion pressure management, and medical treatment of raised intracranial pressure.
Answer: 24
Manage severe traumatic brain injury in the first 24 hours with sedation and analgesia, intracerebral monitoring, cerebral perfusion pressure management, and medical treatment of raised intracranial pressure.
Management of severe traumatic brain injury (first 24hours) · PMID 29288841
recall · CA-2 · phrased by derived
Decompressive craniectomy for refractory intracranial pressure above ___ mm Hg lowers six-month mortality but yields higher rates of vegetative state, lower severe disability, and upper severe disability, with similar moderate disability and good recovery.
Answer: 25
Decompressive craniectomy for refractory intracranial pressure above 25 mm Hg lowers six-month mortality but yields higher rates of vegetative state, lower severe disability, and upper severe disability, with similar moderate disability and good recovery.
Trial of Decompressive Craniectomy for Traumatic Intracranial Hypertension · PMID 27602507
recall · CA-2 · phrased by derived
In traumatic brain injury, hypertonic saline reduces intracranial pressure by ___% and offers similar efficacy to mannitol for improving neurological outcomes and reducing mortality.
Answer: 35.9
In traumatic brain injury, hypertonic saline reduces intracranial pressure by 35.9% and offers similar efficacy to mannitol for improving neurological outcomes and reducing mortality.
Hypertonic saline for traumatic brain injury: a systematic review and meta-analysis · PMID 36404350
recall · CA-2 · phrased by derived
This meta-analysis found no significant mortality difference between early—defined by ___-hour or 6-hour cutoffs—and late intracranial pressure monitoring in traumatic brain injury patients.
Answer: 4
This meta-analysis found no significant mortality difference between early—defined by 4-hour or 6-hour cutoffs—and late intracranial pressure monitoring in traumatic brain injury patients.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
This randomized trial found that TBI patients requiring ICP therapy spent ___% of monitored time within 5 mm Hg of an individualized autoregulation-guided CPP target with no significant between-group difference in therapeutic intensity level.
Answer: 46.5
This randomized trial found that TBI patients requiring ICP therapy spent 46.5% of monitored time within 5 mm Hg of an individualized autoregulation-guided CPP target with no significant between-group difference in therapeutic intensity level.
Targeting Autoregulation-Guided Cerebral Perfusion Pressure after Traumatic Brain Injury (COGiTATE): A Feasibility Randomized Controlled Clinical Trial · PMID 34407385
recall · CA-2 · phrased by derived
This guideline recommends updated first-___-hour strategies for intracerebral monitoring, cerebral perfusion pressure management, and medical management of raised intracranial pressure in severe traumatic brain injury.
Answer: 24
This guideline recommends updated first-24-hour strategies for intracerebral monitoring, cerebral perfusion pressure management, and medical management of raised intracranial pressure in severe traumatic brain injury.
Management of severe traumatic brain injury (first 24hours) · PMID 29288841
recall · CA-2 · phrased by derived
This meta-analysis found no significant mortality difference between early and late ICP monitor placement in traumatic brain injury using 4- or ___-hour cutoffs.
Answer: 6
This meta-analysis found no significant mortality difference between early and late ICP monitor placement in traumatic brain injury using 4- or 6-hour cutoffs.
Timing of Intracranial Pressure Monitoring in Traumatic Brain Injury: A Systematic Review and Meta-Analysis · PMID 40449835
recall · CA-2 · phrased by derived
This feasibility randomized trial found that in traumatic brain injury patients requiring intracranial pressure monitoring, cerebral perfusion pressure was within ___ mm Hg of autoregulation-guided targets for 46.5% of time without increased therapeutic intensity versus Brain Trauma Foundation targets.
Answer: 5
This feasibility randomized trial found that in traumatic brain injury patients requiring intracranial pressure monitoring, cerebral perfusion pressure was within 5 mm Hg of autoregulation-guided targets for 46.5% of time without increased therapeutic intensity versus Brain Trauma Foundation targets.
Targeting Autoregulation-Guided Cerebral Perfusion Pressure after Traumatic Brain Injury (COGiTATE): A Feasibility Randomized Controlled Clinical Trial · PMID 34407385
recall · CA-2 · phrased by derived
This meta-analysis found hypertonic saline was associated with adverse hypernatremia compared with other intracranial-pressure-lowering agents in acute traumatic brain injury, with a risk ratio of 2.13 (___% CI 1.09–4.17).
Answer: 95
This meta-analysis found hypertonic saline was associated with adverse hypernatremia compared with other intracranial-pressure-lowering agents in acute traumatic brain injury, with a risk ratio of 2.13 (95% CI 1.09–4.17).
Hypertonic Saline Versus Other Intracranial-Pressure-Lowering Agents for Patients with Acute Traumatic Brain Injury: A Systematic Review and Meta-analysis · PMID 37380894
recall · CA-2 · phrased by derived
This randomized trial found that among patients 10 to 65 years old with refractory traumatic intracranial pressure over ___ mm Hg, decompressive craniectomy lowered six-month mortality to 26.9% versus 48.9% with medical care but increased rates of vegetative state and severe disability.
Answer: 25
This randomized trial found that among patients 10 to 65 years old with refractory traumatic intracranial pressure over 25 mm Hg, decompressive craniectomy lowered six-month mortality to 26.9% versus 48.9% with medical care but increased rates of vegetative state and severe disability.
Trial of Decompressive Craniectomy for Traumatic Intracranial Hypertension · PMID 27602507
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.