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Occurrence and impact of intracranial pressure elevation during treatment of severe intraventricular hemorrhage.

ABSTRACT: Elevated intracranial pressure is one of the proposed mechanisms leading to poor outcomes in patients with intraventricular hemorrhage. We sought to characterize the occurrence and significance of intracranial hypertension in severe intraventricular hemorrhage requiring extraventricular drainage.Prospective analysis from two randomized, multicenter, clinical trials.Intensive care units of 23 academic hospitals.One hundred patients with obstructive intraventricular hemorrhage and intracerebral hemorrhage volume <30 mL requiring emergency extraventricular drainage from two randomized multicenter studies comparing intraventricular recombinant tissue plasminogen activator (n=78) to placebo (n=22).Intracranial pressure was recorded every 4 hrs in all patients and before and after a 1-hr extraventricular drainage closure period after injection. Intracranial pressure readings were analyzed at predefined thresholds and compared between treatment groups, before and after injection of study agent, and before and after opening of third and fourth ventricles on computed tomography. Impact on 30-day outcomes was assessed.Initial intracranial pressure ranged from -2 to 60 mm Hg (median; interquartile range, 11;10). Of 2576 intracranial pressure readings, 91.5% (2359) were ?20 mm Hg, 1.6% were >30, 0.5% were >40, and 0.2% were >50 mm Hg. In a multivariate analysis, threshold events>20 mm Hg and >30 mm Hg were more frequent in placebo vs. recombinant tissue plasminogen activator-treated groups (p=.03 and p=.08, respectively). Intracranial pressure elevation>20 mm Hg occurred during a required 1-hr extraventricular drainage closure interval in 207 of 868 (23.8%) injections of study agent, although early reopening of the extraventricular drainage only occurred in 7.9%. After radiographic opening of the lower ventricular system, intracranial pressure events>20 mm Hg remained significantly associated with initial intraventricular hemorrhage volume (p=.002) and extraventricular drainage placement ipsilateral to the largest intraventricular hemorrhage volume (p=.001), but not with thrombolytic treatment (p=.05) or intracerebral hemorrhage volume (p=.14). Ventriculoperitoneal shunts were required in 13.6% of placebo and 6.4% of recombinant tissue plasminogen activator-treated patients (p=.37). Percentage of intracranial pressure readings per patient>30 mm Hg and initial intracerebral hemorrhage and intraventricular hemorrhage volumes were independent predictors of 30-day mortality after adjustment for other outcome predictors (p=.003, p=.03, and p<.001, respectively). Independent predictors of poor modified Rankin Scale score at 30 days were percent of intracranial pressure events>30 mm Hg per patient (p=.01; but not >20 mm Hg), both intracerebral hemorrhage and intraventricular hemorrhage volume, and pulse pressure.Intracranial pressure is not frequently elevated during monitoring and drainage with an extraventricular drainage in patients with severe intraventricular hemorrhage, although intracranial pressure >30 mm Hg predicts higher short-term mortality. Thrombolytic therapy may reduce the frequency of high intracranial pressure events. Intracranial pressure elevation appears to be significantly correlated with extraventricular drainage placement in the ventricle with greatest clot volume.

SUBMITTER: Ziai WC

PROVIDER: S-EPMC4365868 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature

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Occurrence and impact of intracranial pressure elevation during treatment of severe intraventricular hemorrhage.

Ziai Wendy C WC Melnychuk Eric E Thompson Carol B CB Awad Issam I Lane Karen K Hanley Daniel F DF

Critical care medicine 20120501 5

<h4>Objectives</h4>Elevated intracranial pressure is one of the proposed mechanisms leading to poor outcomes in patients with intraventricular hemorrhage. We sought to characterize the occurrence and significance of intracranial hypertension in severe intraventricular hemorrhage requiring extraventricular drainage.<h4>Design</h4>Prospective analysis from two randomized, multicenter, clinical trials.<h4>Setting</h4>Intensive care units of 23 academic hospitals.<h4>Patients</h4>One hundred patient ...[more]

PMID: 22430237

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Project description:ObjectivesElevated intracranial pressure and inadequate cerebral perfusion pressure may contribute to poor outcomes in hypertensive intraventricular hemorrhage. We characterized the occurrence of elevated intracranial pressure and low cerebral perfusion pressure in obstructive intraventricular hemorrhage requiring extraventricular drainage.DesignProspective observational cohort.SettingICUs of 73 academic hospitals.PatientsFour hundred ninety-nine patients enrolled in the CLEAR III trial, a multicenter, randomized study to determine if extraventricular drainage plus intraventricular alteplase improved outcome versus extraventricular drainage plus saline.InterventionsIntracranial pressure and cerebral perfusion pressure were recorded every 4 hours, analyzed over a range of thresholds, as single readings or spans (≥ 2) of readings after adjustment for intracerebral hemorrhage severity. Impact on 30- and 180-days modified Rankin Scale scores was assessed, and receiver operating curves were analyzed to identify optimal thresholds.Measurements and main resultsOf 21,954 intracranial pressure readings, median interquartile range 12 mm Hg (8-16), 9.7% were greater than 20 mm Hg and 1.8% were greater than 30 mm Hg. Proportion of intracranial pressure readings from greater than 18 to greater than 30 mm Hg and combined intracranial pressure greater than 20 plus cerebral perfusion pressure less than 70 mm Hg were associated with day-30 mortality and partially mitigated by intraventricular alteplase. Proportion of cerebral perfusion pressure readings from less than 65 to less than 90 mm Hg and intracranial pressure greater than 20 mm Hg in spans were associated with both 30-day mortality and 180-day mortality. Proportion of cerebral perfusion pressure readings from less than 65 to less than 90 mm Hg and combined intracranial pressure greater than 20 plus cerebral perfusion pressure less than 60 mm Hg were associated with poor day-30 modified Rankin Scale, whereas cerebral perfusion pressure less than 65 and less than 75 mm Hg were associated with poor day-180 modified Rankin Scale.ConclusionsElevated intracranial pressure and inadequate cerebral perfusion pressure are not infrequent during extraventricular drainage for severe intraventricular hemorrhage, and level and duration predict higher short-term mortality and long-term mortality. Burden of low cerebral perfusion pressure was also associated with poor short- and long-term outcomes and may be more significant than intracranial pressure. Adverse consequences of intracranial pressure-time burden and cerebral perfusion pressure-time burden should be tested prospectively as potential thresholds for therapeutic intervention.

Project description:Introduction: We investigated the effect of hematoma volume reduction with minimally invasive surgery (MIS) on intracranial pressure (ICP) and cerebral perfusion pressure (CPP) in patients with large spontaneous intracerebral hemorrhage (ICH). Methods: Post-hoc analysis of the Minimally Invasive Surgery Plus Alteplase for Intracerebral Hemorrhage Evacuation (MISTIE III) study, a clinical trial with blinded outcome assessments. The primary outcome was the proportion of ICP readings ≥20 and 30 mmHg, and CPP readings <70 and 60 mm Hg. Secondary outcomes included major disability (modified Rankin scale >3) and mortality at 30 and 365 days. We assessed the relationship between proportion of high ICP and low CPP events and MIS using binomial generalized linear models, and outcomes using multiple logistic regression. Results: Of 499 patients enrolled in MISTIE III, 72 patients had guideline based ICP monitors placed, 34 in the MIS group and 38 in control (no surgery) group. Threshold ICP and CPP events ≥20/ <70 mmHg occurred in 31 (43.1%) and 52 (72.2%) patients respectively. On adjusted analyses, proportion of ICP readings ≥20 and 30 mmHg were significantly lower in the MIS group vs. control group [Odds Ratio (OR) 0.27, 95% Confidence Interval [CI] 0.11-0.63 (p = 0.002); OR = 0.18, 0.04-0.75, p = 0.02], respectively. Proportion of CPP readings <70 and 60 mm Hg were also significantly lower in MIS patients [OR 0.31, 95% CI 0.15-0.63 (p = 0.001); OR 0.30, 95% CI 0.11-0.83 (p = 0.02)], respectively. Higher proportions of CPP readings <70 and 60 mm were significantly associated with short term mortality (p = 0.04), and (p = 0.006), respectively. Long term mortality was significantly associated with higher proportion of time with ICP ≥ 20 (p = 0.04), ICP ≥ 30 (p = 0.04), and CPP <70 mmHg (p = 0.01). Conclusion: Our results are consistent with the hypothesis that surgical reduction of ICH volume decreases proportion of high ICP and low CPP events and that these variables are associated with short- and long-term mortality.

Project description:Background and Purpose- We investigated the prognostic significance of spontaneous intracerebral hemorrhage location in presence of severe intraventricular hemorrhage. Methods- We analyzed diagnostic computed tomography scans from 467/500 (excluding primary intraventricular hemorrhage) subjects from the CLEAR (Clot Lysis: Evaluating Accelerated Resolution of Intraventricular Hemorrhage) III trial. We measured intracerebral hemorrhage engagement with specific anatomic regions, and estimated association of each region with blinded assessment of dichotomized poor stroke outcomes: mortality, modified Rankin Scale score of 4 to 6, National Institutes of Health Stroke Scale score of >4, stroke impact scale score of <60, Barthel Index <86, and EuroQol visual analogue scale score of <50 and <70 at days 30 and 180, respectively, using logistic regression models. Results- Frequency of anatomic region involvement consisted of thalamus (332 lesions, 71.1% of subjects), caudate (219, 46.9%), posterior limb internal capsule (188, 40.3%), globus pallidus/putamen (127, 27.2%), anterior limb internal capsule (108, 23.1%), and lobar (29, 6.2%). Thalamic location was independently associated with mortality (days 30 and 180) and with poor outcomes on most stroke scales at day 180 on adjusted analysis. Posterior limb internal capsule and globus pallidus/putamen involvement was associated with increased odds of worse disability at days 30 and 180. Anterior limb internal capsule and caudate locations were associated with decreased mortality on days 30 and 180. Anterior limb internal capsule lesions were associated with decreased long-term morbidity. Conclusions- Acute intracerebral hemorrhage lesion topography provides important insights into anatomic correlates of mortality and functional outcomes even in severe intraventricular hemorrhage causing obstructive hydrocephalus. Models accounting for intracerebral hemorrhage location in addition to volumes may improve outcome prediction and permit stratification of benefit from aggressive acute interventions. Clinical Trial Registration- URL: https://www.clinicaltrials.gov . Unique identifier: NCT00784134.

Project description:Intracranial pressure (ICP) monitoring is widely used in the management of patients with severe traumatic brain injury (TBI). However, there is limited evidence about the efficacy of ICP monitoring in older subjects (aged ≥65 years). This study evaluated the effect of intraventricular ICP monitoring on the outcome of older adults suffering from a severe TBI.This prospective, observational study included 166 older TBI patients (aged ≥65 years) with Glasgow Coma scale (GCS) scores lower than 9 at admission. The study cohort was divided into two groups, intraventricular ICP monitoring and non-ICP monitoring. The primary outcome was in-hospital mortality. The secondary outcomes included the Glasgow Outcome Scale (GOS) score 6 months after injury, the ICU and total hospital lengths of stay, and mechanical ventilation days.There were 80 patients in the intraventricular ICP monitoring group and 86 patients in non-ICP monitoring group. There was no statistical difference between groups in demographics and severity of head injury. Patients treated with intraventricular ICP monitoring had lower in-hospital mortality (33.8 % vs 51.2 %, P < 0.05), a higher 6-month GOS score (3.0 ± 1.4 vs 2.5 ± 1.2 P < 0.05), and a lower dosage (514 ± 246 g vs 840 ± 323 g, P < 0.0001) and shorter duration (7.2 ± 3.6 days vs 8.4 ± 4.3 days, P < 0.01) of mannitol use. However, the ICU length of stay (14.3 ± 6.4 days vs 11.6 ± 5.8 days, P < 0.01) and mechanical ventilation days (6.7 ± 3.5 days vs 5.6 ± 2.4 days, P < 0.05) were longer in the ICP monitoring group. The total length of hospital stay did not differ between the two groups (28.5 ± 12.1 days vs 26.1 ± 13.5 days, P = 0.23).Intraventricular ICP monitoring may have beneficial effects on the decreased in-hospital mortality and improved 6-month outcome of older patients with severe TBI. However, given that this was an observational study conducted in a single institution, further well-designed randomized control trials are needed to evaluate the effect of intraventricular ICP monitoring on the outcome of older severe TBI patients.

Project description:BACKGROUND:Infusion testing is a common procedure to determine whether shunting will be beneficial in patients with normal pressure hydrocephalus. The method has a well-developed theoretical foundation and corresponding mathematical models that describe the CSF circulation from the choroid plexus to the arachnoid granulations. Here, we investigate to what extent the proposed glymphatic or paravascular pathway (or similar pathways) modifies the results of the traditional mathematical models. METHODS:We used a compartment model to estimate pressure in the subarachnoid space and the paravascular spaces. For the arachnoid granulations, the cribriform plate and the glymphatic circulation, resistances were calculated and used to estimate pressure and flow before and during an infusion test. Finally, different variations to the model were tested to evaluate the sensitivity of selected parameters. RESULTS:At baseline intracranial pressure (ICP), we found a very small paravascular flow directed into the subarachnoid space, while 60% of the fluid left through the arachnoid granulations and 40% left through the cribriform plate. However, during the infusion, 80% of the fluid left through the arachnoid granulations, 20% through the cribriform plate and flow in the PVS was stagnant. Resistance through the glymphatic system was computed to be 2.73 mmHg/(mL/min), considerably lower than other fluid pathways, giving non-realistic ICP during infusion if combined with a lymphatic drainage route. CONCLUSIONS:The relative distribution of CSF flow to different clearance pathways depends on ICP, with the arachnoid granulations as the main contributor to outflow. As such, ICP increase is an important factor that should be addressed when determining the pathways of injected substances in the subarachnoid space. Our results suggest that the glymphatic resistance is too high to allow for pressure driven flow by arterial pulsations and at the same time too small to allow for a direct drainage route from PVS to cervical lymphatics.

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Occurrence and impact of intracranial pressure elevation during treatment of severe intraventricular hemorrhage.

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Occurrence and impact of intracranial pressure elevation during treatment of severe intraventricular hemorrhage.

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