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Title:
Critical Thresholds for Cerebrovascular Reactivity After Traumatic Brain Injury | Neurocritical Care
Description:
Pressure-reactivity index (PRx) is a useful tool in brain monitoring of trauma patients, but the question remains about its critical values. Using our TBI database, we identified the thresholds for PRx and other monitored parameters that maximize the statistical difference between death/survival and favorable/unfavorable outcomes. We also investigated how these thresholds depend on clinical factors such as age, gender and initial GCS. A total of 459 patients from our database were eligible. Tables of 2 × 2 format were created grouping patients according to survival/death or favorable/unfavorable outcomes and varying thresholds for PRx, ICP and CPP. Pearson’s chi square was calculated, and the thresholds returning the highest score were assumed to have the best discriminative value. The same procedure was repeated after division according to clinical factors. In all patients, we found that PRx had different thresholds for survival (0.25) and for favorable outcome (0.05). Thresholds of 70 mmHg for CPP and 22 mmHg for ICP were identified for both survival and favorable outcomes. The ICP threshold for favorable outcome was lower (18 mmHg) in females and patients older than 55 years. In logistic regression models, independent variables associating with mortality and unfavorable outcome were age, GCS, ICP and PRx. The prognostic role of PRx is confirmed but with a lower threshold of 0.05 for favorable outcome than for survival (0.25). Results for ICP are in line with current guidelines. However, the lower value in elderly and in females suggests increased vulnerability to intracranial hypertension in these groups.
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article, google, scholar, injury, pubmed, brain, pressure, cerebral, traumatic, head, care, cas, thresholds, neurosurg, patients, perfusion, outcome, intracranial, severe, czosnyka, critical, reactivity, trauma, cambridge, university, prx, monitoring, research, cerebrovascular, menon, icp, privacy, cookies, content, analysis, clinical, access, neurological, data, publish, search, neurocritical, sorrentino, kasprowicz, smielewski, pickard, outcomes, factors, favorable, threshold,
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month download article/chapter receiver-operating characteristic curves prognostic scores based risk prediction models specialist neurocritical care full article pdf traumatic brain injury privacy choices/manage cookies mary corbridge trust severe brain injury biomedical research centre acute brain injury severe head injury cerebrovascular pressure reactivity closed head injury severe head trauma tbi database severe head injuries cerebral perfusion thresholds cerebral perfusion pressure prognostic role clinical factors cerebral vasomotor reactivity perfusion pressure targets european economic area scope submit manuscript logistic regression models independent variables associating glasgow coma scale multimodality evoked potentials claridge ja transcranial doppler indices regional energy metabolism extracellular glutamate caused senior investigator awards mrc programme grant intensive care med intracranial pressure vary conditions privacy policy international selfotel trial check access crit care med instant access gender-related differences created grouping patients clinical material helped cerebral autoregulation impairment intensive care management article sorrentino accepting optional cookies
Questions {❓}
- Is there an upper limit of intracranial pressure in patients with severe head injury if cerebral perfusion pressure is maintained?
- What Determines Outcome in Patients That Suffer Raised Intracranial Pressure After Traumatic Brain Injury?
- What is the optimal threshold for cerebral perfusion pressure following traumatic brain injury?
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headline:Critical Thresholds for Cerebrovascular Reactivity After Traumatic Brain Injury
description:Pressure-reactivity index (PRx) is a useful tool in brain monitoring of trauma patients, but the question remains about its critical values. Using our TBI database, we identified the thresholds for PRx and other monitored parameters that maximize the statistical difference between death/survival and favorable/unfavorable outcomes. We also investigated how these thresholds depend on clinical factors such as age, gender and initial GCS.
A total of 459 patients from our database were eligible. Tables of 2 × 2 format were created grouping patients according to survival/death or favorable/unfavorable outcomes and varying thresholds for PRx, ICP and CPP. Pearson’s chi square was calculated, and the thresholds returning the highest score were assumed to have the best discriminative value. The same procedure was repeated after division according to clinical factors. In all patients, we found that PRx had different thresholds for survival (0.25) and for favorable outcome (0.05). Thresholds of 70 mmHg for CPP and 22 mmHg for ICP were identified for both survival and favorable outcomes. The ICP threshold for favorable outcome was lower (18 mmHg) in females and patients older than 55 years. In logistic regression models, independent variables associating with mortality and unfavorable outcome were age, GCS, ICP and PRx. The prognostic role of PRx is confirmed but with a lower threshold of 0.05 for favorable outcome than for survival (0.25). Results for ICP are in line with current guidelines. However, the lower value in elderly and in females suggests increased vulnerability to intracranial hypertension in these groups.
datePublished:2011-10-01T00:00:00Z
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Prognosis
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headline:Critical Thresholds for Cerebrovascular Reactivity After Traumatic Brain Injury
description:Pressure-reactivity index (PRx) is a useful tool in brain monitoring of trauma patients, but the question remains about its critical values. Using our TBI database, we identified the thresholds for PRx and other monitored parameters that maximize the statistical difference between death/survival and favorable/unfavorable outcomes. We also investigated how these thresholds depend on clinical factors such as age, gender and initial GCS.
A total of 459 patients from our database were eligible. Tables of 2 × 2 format were created grouping patients according to survival/death or favorable/unfavorable outcomes and varying thresholds for PRx, ICP and CPP. Pearson’s chi square was calculated, and the thresholds returning the highest score were assumed to have the best discriminative value. The same procedure was repeated after division according to clinical factors. In all patients, we found that PRx had different thresholds for survival (0.25) and for favorable outcome (0.05). Thresholds of 70 mmHg for CPP and 22 mmHg for ICP were identified for both survival and favorable outcomes. The ICP threshold for favorable outcome was lower (18 mmHg) in females and patients older than 55 years. In logistic regression models, independent variables associating with mortality and unfavorable outcome were age, GCS, ICP and PRx. The prognostic role of PRx is confirmed but with a lower threshold of 0.05 for favorable outcome than for survival (0.25). Results for ICP are in line with current guidelines. However, the lower value in elderly and in females suggests increased vulnerability to intracranial hypertension in these groups.
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