Relationship of cerebral perfusion pressure and survival in pediatric brain-injured patients

BACKGROUND: Adult brain injury studies recommend maintaining cerebral perfusion pressure (CPP) above 70 mm Hg. We evaluated CPP and outcome in brain-injured children. METHODS: We retrospectively reviewed the hospital courses of children at two Level I trauma centers who required insertion of intracranial pressure (ICP) monitors for management of traumatic brain injury. ICP, CPP, and mean arterial pressure were evaluated hourly, and means were calculated for the first 48 hours after injury. RESULTS: Of 188 brain-injured children, 118 had ICP monitors placed within 24 hours of injury. They suffered severe brain injury, with average admitting Glasgow Coma Scale scores of 6 +/- 3. Overall mortality rate was 28%. No patient with mean CPP less than 40 mm Hg survived. Among patients with mean CPP in deciles of 40 to 49, 50 to 59, 60 to 69, or 70 mm Hg, no significant difference in Glasgow Outcome Scale distribution existed. CONCLUSION: Low mean CPP was lethal. In children with survivable brain injury (mean CPP > 40 mm Hg), CPP did not stratify patients for risk of adverse outcome.     

Diffuse Axonal Injury (DAI) is not Associated with Elevated Intracranial Pressure (ICP)

Summary Objective. Traditionally, intracranial pressure (ICP) monitoring has been utilized in all patients with severe head injury (Glasgow coma score of 3–8). Ventriculostomy placement, however, does carry a 4 to 10 percent complication rate consisting mostly of hematoma and infection. The authors propose that a subgroup of patients presenting with severe head trauma and diffuse axonal injury without associated mass lesion, do not need ICP monitoring. Additionally, the monitoring data from ICP, MAP, and CPP for a comparison severe head injury group, and subgroups of DAI would be presented. Materials and methods. Thirty-six patients sustaining blunt head trauma and fitting our strict clinical and radiographic diagnosis of DAI were enrolled in our study. Inclusion criteria were severe head injury patients who did not regain consciousness after the initial impact, and whose CT scan demonstrated characteristic punctate hemorrhages of <10 mm diameter at the greywhite junction, basal ganglia, corpus callosum, upper brainstem, or a combination of the above. Patients with significant mass lesions and documented anoxia were excluded. Their intracranial pressure (ICP) and cerebral perfusion pressure (CPP) were compared to a control group of 36 consecutive patients with severe non-penetrating non-operative head injury, using the Analysis for Variance method. Results. Eighteen (50.0%), six (16.7%), and twelve (33.3%) patients had types I, II, and III DAI, respectively. The admission Glasgow Coma Score (GCS) was higher for types I and II than for type III DAI. ICP was monitored from 23 to 165 hours, with a mean ICP for 36 patients of 11.70 mmHg (SEM=75) and a range from 4.3 to 17.3 mmHg. Of all ICP recordings, of which 89.7% (2421/2698) were ≤20 mmHg. Average mean arterial pressure (MAP) was 96.08 mmHg (SEM=1.69), and 94.6% (2038/2154) of all MAP readings were greater than 80 mmHg. Average cerebral perfusion pressure (CPP) was 85.16 mmHg (SEM=1.68), and 90.1% (1941/2154) of all CPP readings were greater than 70 mmHg. This is compared to the control group mean ICP, MAP, and CPP of 16.84 mmHg (p=0.000021), 92.80 mmHg (p=0.18), and 76.49 mmHg (p=0.0012). No treatment for sustained elevated ICP>20 mmHg was needed for DAI patients except in two; one with extensive intraventricular and subarachnoid hemorrhage who developed communicating hydrocephalus, and another with ventriculitis requiring intrathecal and intravenous antibiotic treatments. Two complications, one from a catheter tract hematoma, and another with Staph epidermidis ventriculitis, were encountered. All patients, except type III DAI, generally demonstrated marked clinical improvement with time. The outcome, as measured by Glasgow Coma Score (GCS) and Glasgow Outcome Score (GOS) was similarly better with types I and II than type III DAI. Conclusion. The authors conclude that ICP elevation in DAI patients without associated mass lesions is not as prevalent as other severe head injured patients, therefore ICP monitoring may not be as critical. The presence of an ICP monitoring device may contribute to increased morbidity. Of key importance, however, is an accurate clinical history and interpretation of the CT scan.     

Resuscitation of hypotensive head-injured patients: is hypertonic saline the answer?

Hypertonic saline (HTS) may decrease intracranial pressure (ICP) in severe traumatic brain injury (STBI) and effectively resuscitates hypotensive patients. No data exist on institutional standardization of HTS for hypotensive patients with STBI. It remains unclear how HTS affects brain tissue oxygenation (PbtO2) in STBI. We hypothesized HTS could be safely standardized in patients with STBI and would lower ICP while improving cerebral perfusion pressure (CPP) and PbtO2. Under institutional guidelines in a Level I trauma center, 12 hypotensive STBI intensive care unit subjects received HTS. Inclusion criteria included mean arterial pressure (MAP) < or = 90 mmHg, Glasgow Coma Scale (GCS) < or = 8, ICP > or = 20 mmHg, and serum [Na+] <155 mEq/L. All patients underwent ICP monitoring. Hemodynamics, CPP, ICP, and PbtO2 data were collected before and hourly for 6 hours after HTS infusion. Guideline criteria compliance was greater than 95 per cent. No major complications occurred. Mean ICP levels dropped by 45 per cent (P < 0.01) and this drop persisted for 6 hours. CPP levels increased by 20 per cent (P < 0.05). PbtO2 remained persistently elevated for all time points after HTS infusion. Institutional use of HTS in STBI can be safely implemented in a center caring for neurotrauma patients. HTS infusion in hypotensive STBI reduces ICP and raises CPP. Brain tissue oxygenation tends to improve after HTS infusion.     

Intracranial pressure levels and single wave amplitudes, Glasgow Coma Score and Glasgow Outcome Score after subarachnoid haemorrhage

Summary Object. To relate intracranial pressure (ICP) levels and single ICP wave amplitudes to the acute clinical state (Glasgow Coma Score, GCS) and final clinical outcome (Glasgow Outcome Score, GOS) in patients with subarachnoid haemorrhage (SAH). Methods. Twenty-seven consecutive patients with severe SAH had their ICP and arterial blood pressure (ABP) continuously monitored during days 1–6 after SAH. The acute clinical state could be assessed in 11 non-sedated cases using the Glasgow Coma Scale, while outcome was assessed in all cases after 6 months using the Glasgow Outcome Scale. The ICP/ABP recordings were stored as raw data files and analyzed retrospectively. For every consecutive 6 seconds time window, mean ICP, mean cerebral perfusion pressure (CPP) and the mean ICP wave amplitude were computed. Results. The GCS during days 1–6 after SAH was significantly related to the mean ICP wave amplitude, but not to the mean ICP or mean CPP. There was also a strong relationship between the mean ICP wave amplitude and GOS 6 months after SAH, with mean ICP wave amplitudes being significantly lower in those with moderate disability/good recovery, as compared with those with severe disability and death. Mean ICP was significantly higher in those who died than in the group with moderate disability/good recovery whereas mean CPP was not different between outcome groups. Conclusions. In this small patient group the mean ICP wave amplitude during days 1–6 after SAH was related to the acute clinical state (GCS) as well as to the clinical outcome (GOS) 6 months after SAH. Similar relationships were not found for mean ICP or the mean CPP, except for a higher mean ICP in those who died than in those with moderate disability/good recovery.     

Improvement in GOS and GOSE scores 6 and 12 months after severe traumatic brain injury

PRIMARY OBJECTIVE: To assess improvements in Glasgow Outcome Scale (GOS) and GOS extended (GOSE) scores between 6 months and 1 year following severe traumatic brain injury (TBI). METHODS AND PROCEDURES: One studied 214 adult patients with severe TBI with Glasgow Coma Scale (GCS) <9 admitted to Intensive Care Unit (ICU). GOS scores were obtained 6 and 12 months after injury in 195 subjects. Patients were predominantly male (84%) and median age was 35 years. MAIN OUTCOMES AND RESULTS: Outcome (GOS and GOSE at 6 months and 1 year) was better in the high GCS score at admission (6-8) group than in the low score group (3-5). The improvement in GOS scores between 6 months and 1 year was greater in the high GCS score at admission group than in the low score group. At 6 months, 75 patients had died and 120 survived. None died between the 6-12-month assessments; at 12 months, 36% had improved GOS score. CONCLUSIONS: GOS scores improved between 6-12 months after severe TBI in 36% of survivors and it is concluded that the expectancy of improvement is incomplete at 6 months. This improvement was greater in patients with better GCS scores (6-8) at admission than in those with worse GCS scores (3-5).     

The relation between acute physiological variables and outcome on the Glasgow Outcome Scale and Disability Rating Scale following severe traumatic brain injury

The relation between outcome and duration of adverse physiological events was studied, using suggested critical physiological values. Subjects were 184 patients with severe traumatic brain injury who received continuous monitoring of intracranial pressure (ICP), mean arterial pressure (MAP), cerebral perfusion pressure (CPP), and jugular venous oxygen saturation. Longer durations of adverse physiological events were significantly related to Glasgow Outcome Scale (GOS) scores and Disability Rating Scale (DRS) scores for all variables at all timepoints postinjury. When analyses excluded patients who died, the relation between adverse physiological events and GOS was nonsignificant; however, duration of ICP, MAP, and CPP still accounted for a significant portion of the variance in DRS scalres. The relative sensitivity of the GOS and DRS is discussed.     

Reduced mortality rate in patients with severe traumatic brain injury treated with brain tissue oxygen monitoring

OBJECT: An intracranial pressure (ICP) monitor, from which cerebral perfusion pressure (CPP) is estimated, is recommended in the care of severe traumatic brain injury (TBI). Nevertheless, optimal ICP and CPP management may not always prevent cerebral ischemia, which adversely influences patient outcome. The authors therefore determined whether the addition of a brain tissue oxygen tension (PO2) monitor in the treatment of TBI was associated with an improved patient outcome. METHODS: Patients with severe TBI (Glasgow Coma Scale [GCS] score < 8) who had been admitted to a Level I trauma center were evaluated as part of a prospective observational database. Patients treated with ICP and brain tissue PO2 monitoring were compared with historical controls matched for age, pathological features, admission GCS score, and Injury Severity Score who had undergone ICP monitoring alone. Therapy in both patient groups was aimed at maintaining an ICP less than 20 mm Hg and a CPP greater than 60 mm Hg. Among patients whose brain tissue PO2 was monitored, oxygenation was maintained at levels greater than 25 mm Hg. Twenty-five patients with a mean age of 44 +/- 14 years were treated using an ICP monitor alone. Twenty-eight patients with a mean age of 38 +/- 18 years underwent brain tissue PO2-directed care. The mean daily ICP and CPP levels were similar in each group. The mortality rate in patients treated using conventional ICP and CPP management was 44%. Patients who also underwent brain tissue PO2 monitoring had a significantly reduced mortality rate of 25% (p < 0.05). CONCLUSIONS: The use of both ICP and brain tissue PO2 monitors and therapy directed at brain tissue PO2 is associated with reduced patient death following severe TBI.     

Glial fibrillary acidic protein in serum after traumatic brain injury and multiple trauma

BACKGROUND: This study aimed to determine whether glial fibrillary acidic protein (GFAP) is released after traumatic brain injury (TBI), whether GFAP is related to brain injury severity and outcome after TBI, and whether GFAP is released after multiple trauma without TBI. METHODS: This prospective study enrolled 114 patients who had TBI with or without multiple trauma (n = 101) or multiple trauma without TBI (n = 13), as verified by computerized tomography. Daily GFAP measurement began at admission (<12 hours after trauma) and continued for the duration of intensive care (1-22 days). Documentation included categorization of computerized tomography according to Marshall classification, based on daily highest intracranial pressure (ICP), lowest cerebral perfusion pressure (CPP), lowest mean arterial pressure (MAP), and 3-month Glasgow Outcome Score (GOS). RESULTS: The GFAP concentration was lower for diffuse injury 2 than for diffuse injury 4 (p < 0.0005) or nonevacuated mass lesions larger than than 25 mL (p < 0.005), lower for a ICP less than 25 mm Hg than for a ICP of 25 mm Hg or more, lower for a CPP of 60 mm Hg or more than for a CPP of 60 mm Hg or less, lower for a MAP of 60 mm Hg or more than for a MAP less than 60 mm Hg (all p < 0.0005), and lower for a GOS of 1 or 2 than for a GOS of 3, 4 (p < 0.05), or 5 (p < 0.0005). After TBI, GFAP was higher in nonsurvivors (n = 39) than in survivors (n = 62) (p < 0.005). After multiple trauma without TBI, GFAP remained normal. CONCLUSIONS: The findings showed that GFAP is released after TBI, that GFAP is related to brain injury severity and outcome after TBI, and that GFAP is not released after multiple trauma without brain injury.     

Outcome prediction in severe traumatic brain injury with transcranial Doppler ultrasonography

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Management morbidity and mortality in grade IV and V patients with aneurysmal subarachnoid haemorrhage

Summary Intracranial haemodynamics were studied in 20 patients with diffuse and focal brain injury and experimental animals with acute intracranial hypertension by the use of TCD ultrasound. The mean flow velocity in the middle cerebral artery (MCA) commonly decreased on the side of the haematoma depending on intracranial pressure (ICP) elevation and cerebral perfusion pressure (CPP) reduction in focal injury. The decrease of the MCA flow velocity returned to normal after treatment. The flow velocities decreased bilaterally and there was no difference between the right and left side in diffuse injury. But the velocities increased in spite of ICP elevation when diffuse cerebral swelling developed. Cerebrovascular CO₂ reactivity was impaired in two groups of patients with low Glasgow Coma Scale (GCS) scores. The mean velocity of the MCA and blood flow in the internal carotid artery exhibited flow patterns which changed correlatively depending on CPP reduction in experimental animals. Noninvasive study by use of TCD ultrasound can provide valuable information on variant haemodynamic phenomena in patients with diffuse and focal brain injury.     

Efficacy and limitation of postoperative barbiturate therapy in severe head injury

Efficacy and limitation of barbiturate therapy employed as postoperative treatment for acute traumatic intracranial hematomas were studied in 20 patients. The clinical cases in this series included 15 males and 5 females with mean age of 41.8 years who all were operated on for intracranial hematomas within 3 days after injury. Glasgow Coma Scale (GCS) score was less than 7 in all instances and intracranial pressure (ICP) as well as arterial pressure was monitored postoperatively with Gaeltec and Gould transducers. Barbiturate therapy (5 mg/kg of thiopental as an initial dose and loading dose of 2-3 mg/kg/hour) was given when ICP rose above 20 mmHg and maintained for 3 days after operation. The outcome of the patients was assessed by Glasgow Outcome Scale 3 months after injury. The response of barbiturate on ICP and the changes of cerebral perfusion pressure (CPP) during the therapy in relation to the outcome were studied. Final outcome of the patients revealed 5 of good (good recovery and moderate disability), 3 of poor (severe disability and vegetative state) outcomes and 60% of mortality rate. Eleven out of 20 patients responded to barbiturate therapy and 0-20 mmHg of ICP reduction (mean reduction of 10 mmHg) was obtained in these cases. Among these cases, 2 out of 3 dead patients were older than 60 years. There were no responses of barbiturate in 7 patients to whom the therapy was started when ICP rose above 40 mmHg. No response of the therapy on ICP was also observed in the patients with GCS score of 3.(ABSTRACT TRUNCATED AT 250 WORDS)     

Children and young adults in a prolonged unconscious state after severe brain injury: long-term functional outcome as measured by the DRS and the GOSE after early intensive neurorehabilitation

OBJECTIVE: To investigate the long-term (2-15 years) functional outcome of children and young adults who received an early intensive neurorehabilitation programme (EINP) after a prolonged period of unconsciousness due to severe brain injury; to differentiate between traumatic brain injury (TBI) and non-traumatic brain injury (nTBI); and to compare the results on two different outcome scales: the Disability Rating Scale (DRS) and the Glasgow Outcome Scale Extended (GOSE). SUBJECTS: One hundred and forty-five patients, who were admitted to EINP between December 1987 and January 2001. Outcome measures: The Post-Acute Level of Consciousness scale (PALOC-s), the DRS, including categorized scores (DRScat), and the GOSE. RESULTS: The long-term functional level of 90 patients could be determined, of whom 25 were deceased. The mean DRS-score of the surviving patients was 6.8 (SD = 6.6); the mean score on the GOSE was 4.5 (SD = 1.7). There was a significant difference in the outcome amongst traumatic and non-traumatic patients (t88 = 4.21; p < 0.01). The correlation between the DRS and the GOSE was high (Spearman rho = 0.85; p < 0.01), as well as the correlation between the categorized scores of the DRS and the GOSE (Spearman rho = 0.81; p < 0.01). The distribution of outcome scores on the DRScat is more diverse than on the GOSE. Especially item 7 of the DRS, measuring functional independence, showed considerable variance in discriminating between different outcome levels. CONCLUSIONS: More patients with TBI than expected reached a (semi-) independent level of functioning, indicating a possible effect of EINP. Patients suffering from nTBI did not demonstrate these outcome levels. Only a few patients stayed in a vegetative state for more than a couple of years. In this cohort of severe brain-injured young people, the DRS offered the best investigative possibilities for long-term level of functioning.     

Prévention de l'augmentation de la pression artérielle et de la pression intracrânienne lors de l'intubation endotrachéale en neurochirurgie: esmolol versus lidocaïne

ObjectivesTo compare the preventive effects of esmolol and lidocaine on the increase in mean arterial pressure (MAP) and intracranial pressure (ICP) during endotracheal intubation in neurosurgery.Study designComparative, randomised, double-blind study.PatientsTwenty-two patients, physical status ASA I or II, undergoing neurosurgery, and randomised into two groups (esmolol group and lidocaine group).MethodsAfter induction of anaesthesia with thiopentone, vecuronium, fentanyl and isoflurane, one group received iv esmolol 1.5 mg·kg⁻¹ and the other iv lidocaine 1.5 mg·kg⁻¹, 130 sec before endotracheal intubation. The MAP measured with a radial catheter, the ICP obtained with a lumbar subarachnoid catheter and the cerebral perfusion pressure (CPP, calculated from MAP and ICP) were assessed before induction of anaesthesia, before esmolol or lidocaine injection, and before intubation, during the maximal change in MAP, as well as 2 and 5 minutes after intubation.ResultsThe time course of MAP, ICP and CCP were similar throughout the study in the two groups, with a significant decrease (P < 0.05) of the CPP from 92 ± 12 to 628 mmHg after esmolol, and from 96 ± 12 to 68 ± 15 mmHg after lidocaine. Following intubation, CPP increased significantly (P < 0.05) to 99 ± 23 mmHg after esmolol and to 99 ± 17 mmHg after lidocaine. The ICP increased also significantly (P < 0.05) after intubation from 11 ± 6 to 17 ± 10 mmHg in the esmolol group, and from 10 ± 6 to 16 ± 9 mm Hg in the lidocaine group.ConclusionsEsmotol or lidocaine as an iv bolus of 1.5 mg·kg⁻¹ before laryngoscopy and intubation do not completely prevent the increase in MAP and ICP.     

EFFECT OF BOLUS DOSES OF MIDAZOLAM ON INTRACRANIAL PRESSURE AND CEREBRAL PERFUSION PRESSURE IN PATIENTS WITH SEVERE HEAD INJURY

We have studied the effects of bolus doses of midazolam 0.15mg kg^–1 i.v. on intracranial pressure (ICP), mean arterialpressure (MAP) and cerebral perfusion pressure (CPP) in 12 patientswith severe head injury (Glasgow Coma Scale score 6). The studywas performed in patients aged 17–44 yr who were sedated(phenoperidine 20 µg kg^–1 h^–1) and paralysed(vecuronium 2 mg h^–1). Midazolam reduced MAP from 89.0mm Hg to 75.0 mm Hg (P<0.0001), while CPP decreased from71.0 mm Hg to 55.8 mm Hg (P<0.0001). During the study, CPPdecreased to less than 50 mm Hg in four patients. Midazolaminduced small, non-significant changes in ICP. However, whencontrol ICP was less than 18 mm Hg (n=7 patients), an increasein ICP was observed. The remaining five patients (control ICP18 mm Hg) exhibited a slight decrease in ICP. These findingssuggest that bolus administration of midazolam should be performedwith great caution in patients with severe head injury, especiallywhen ICP is less than 18 mm Hg.     

Prognostic value of early computerized tomography scanning following craniotomy for traumatic hematoma.

OBJECT: Patients with head injuries traditionally were categorized on the basis of whether their lesions appeared to be diffuse, focal, or mass lesions on admission computerized tomography (CT) scanning. In the classification of Marshall, et al., the presence of a hematoma (evacuated or not evacuated) is more significant than any diffuse injury (DI). The CT scan appearance after evacuation of a mass lesion has not been analyzed previously in relation to outcome. The authors have investigated the importance of: 1) neurological assessment at hospital admission; 2) the status of the basal cisterns and associated intracranial lesions on the admission CT scan; and 3) the degree of DI on the early CT scan obtained after craniotomy to identify patients at risk for development of raised intracranial pressure (ICP) and lowered cerebral perfusion pressure (CPP) and to discover the influence of the postoperative CT appearance of the lesion on patient outcome. METHODS: The authors prospectively studied 82 patients with isolated, severe closed head injury (Glasgow Coma Scale [GCS] score < or = 8), all of whom had intracranial hematoma. Both ICP and CPP were continuously monitored, and a CT scan was obtained within 2 to 12 hours after craniotomy. The CT images were categorized according to the classification of Marshall, et al. The mortality rate during the hospital stay was 37%, and 50% of the patients achieved a favorable outcome. Compression of the basal cistern on the admission (preoperative) CT scan was associated with raised ICP and a CPP of less than 70 mm Hg but not with any other features or with poor patient outcome. In 53 patients the postoperative CT scan revealed DIs III or IV and 29 patients had DIs I or II. The percentages of time during the hospital stay in which ICP was higher than 20 mm Hg and CPP was lower than 70 mm Hg as well as unfavorable outcome were higher in the group of patients in whom DI III or IV was present (p < 0.001). Raised ICP, CPP lower than 70 mm Hg, DI III or IV, and unfavorable outcome were more frequently observed in patients who presented with a motor (m)GCS score of 3 or less, bilateral unreactive pupils, associated intracranial injuries, and hypotension (p < 0.001). When logistic regression analysis was performed, an mGCS score of 3 or less (p = 0.0013, odds ratio [OR] 10.8), bilateral unreactive pupils (p = 0.0047, OR 31.8), and DI III or IV observed on CT scanning after surgery (p = 0.015, OR 8.9) were independently associated with poor outcome. CONCLUSIONS: Features on CT scans obtained shortly after craniotomy constitute an independent predictor of outcome in patients with traumatic hematoma. Patients in whom DI III or IV appears on postoperative CT scanning, who often present with an mGCS score of 3 or less and nonreactive pupils, are at high risk for the development of raised ICP and lowered CPP.     

血管内热交换降温对患者重型外伤性脑损伤的影响

目的 探讨血管内热交换降温对患者重型外伤性脑损伤的影响.方法 选择格拉斯哥昏迷评分(GCS评分)3～8分的重型外伤性脑损伤患者20例,采用随机数字表法,将患者随机分为冰袋降温组(IBC组)和血管内热交换降温组(EVC组),每组10例.IBC组术后采用冰袋降温,EVC组于手术开始时采用血管内热交换技术进行34℃亚低温治疗,维持至术后48 h.于术前10 min(基础状态)和术后24、48、72、96 h时取外周静脉血样,采用酶联免疫法测定血清神经元特异性烯醇化酶(NSE)、髓鞘碱性蛋白(MBP)和S-100B的浓度.分别于术前10 min和术后8、12、24、48、72 h时记录HR、MAP、颅内压(ICP)和脑灌注压(CPP),于术前10 min和术后12、24、48、72 h时行GCS评分,术后6个月行格拉斯哥预后评分(GOS评分).结果 与IBC组比较,EVC组术后8 h和12 h时HR降低,术后72 h时MAP升高,术后12、24、48和72 h时ICP降低,CPP升高,术后24、48、72和96 h时NSE的浓度及术后48、72、96 h时MBP和S-100B浓度降低,术后6个月GOS评分升高(P＜0.05或0.01);与基础状态比较,IBC组术后12 h时GCS评分降低,术后8、12、24、48、72 h时HR升高,术后24、48、72、96 h时NSE和S-100B的浓度及术后48、72、96 h时MBP浓度升高,EVC组术后48、72 h时HR升高,术后72h时MBP及术后48 h时S-100B浓度升高(P＜0.05或0.01).结论 通过血管内热交换降温技术进行34℃亚低温可有效减轻患者重型外伤性脑损伤的程度.

Abstract：

Objective To investigate the effects of mild hypothermia induced by endovascular cooling with heating exchange catheters on severe traumatic brain injury in patients. Methods Twenty patients with severe traumatic brain injury aged 18-60 yr were randomly divided into 2 groups (n=10 each):ice bay cooling group (group IBC) and endovascular cooling group (group EVC).The state of consciousness was scored on a Glasgow coma scale (GCS).The patients had GCS scores of 3-8. The patients underwent emergency surgery.A probe of intracranial pressure monitor was placed during operation.In group EVC intravascular heat exchange catheters were inserted via femoral vein and connected to intravascular heat exchange system (CoolGard 3000, Alsius, USA). In group EVC body temperature was reduced to 34℃ and maintained at this level for 48 h. MAP, HR, body temperature and intracranial pressure (ICP) were continuously monitored and cerebral perfusion pressure (CPP) was calculated. Blood samples were taken from peripheral vein for determination of serum concentrations of neuron specific enolase (NSE), myelin basic protein (MBP) and S-100B (by enzyme linked immunosorbent assay) and GCS scores were assessed at 10 min before (baseline) and 12, 24, 48 and 72 h after operation. The state of consciousness was again assessed 3 months after operation and scored on Glasgrow outcome scale(GOS). Results ICP was significantly lower and CPP was higher after operation in group EVC than in group IBC. Serum concentrations of NSE, MBP and S-100B were significantly lower after operation in group EVC than in group IBC. Conclusion Mild hypothermia induced by endovascular cooling with heating exchange catheters can effectively reduce severe traumatic brain injury in patients.     

CEREBRAL ELECTRICAL ACTIVITY INFLUENCES THE EFFECTS OF ETOMIDATE CEREBRAL PERFUSION PRESSURE IN TRAUMATIC COMA

The effects of 124 boluses of etomidate 0.2 mg kg^-1 i.v. onintracranial pressure (ICP), mean arterial pressure (MAP) andcerebral perfusion pressure (CPP) were studied in eight patientswith severe head injury (Glasgow coma score < 8). The datawere divided into two groups based on the minimum voltage ofthe cerebral function monitor (CFM) recording before the bolus.In group A this was less than 5 µV (representing profoundcortical electrical depression), while in group B the minimumvoltage was greater than 5µV. The mean decrease in ICPfollowing etomidate was significantly greater in group B (mean±SEM:–8.6 ±0.7 mm Hg) than in group A (–3.8±0.6mm Hg) (P < 0.0001). The decrease in arterial pressure wassimilar in both groups. Consequently, there was a small meanincrease in CPP in group B (2.2±0.9mm Hg), whereas ingroup A CPP decreased (–4.7±1.5mm Hg) (P < 0.001).There was a strong correlation between the decreases in ICPand MAP in group A (r = 0.70, P<0.01), but not in group B(r= 0.05). Thus, when cortical electrical activity was alreadymaximally suppressed, further administration of an i.v. anaestheticagent produced only relatively small decreases in ICP, largelyas a passive response to decreases in MAP. CPP was thereforeusually reduced. Conversely, in the absence of such depressionlarger decreases in ICP, unrelated to hypotension, occurredand these were usually associated with increases in CPP. However,even under these circumstances, potentially dangerous decreasesin CPP may be seen.     

Effet de l'ondansétron sur la pression intracrânienne et la pression de perfusion cérébrale chez le patient neurochirurgical

ObjectiveTo determine the effect of ondansetron on intracranial pressure (ICP), mean arterial pressure (MAP) and cerebral perfusion pressure (CPP).Study designProspective, comparative, randomized double-blind study.PatientsTwenty-six patients undergoing intracranial surgery.MethodInduction was obtained with propofol (1–2.5 mg·kg⁻¹), fentanyl (1.5 μg·kg⁻¹) and pancuronium (0.1 mg·kg⁻¹), and maintenance was achieved with propofol and fentanyl. Intermittent positive pressure ventilation was used to ensure mild hypocapnia at 35 ± 2 mmHg. Positioning of the patient was followed by 15 minutes steady-state. Patient received thereafter either 8 mg ondansetron or a placebo intravenously. The ICP was measured using a lumbar malleable spinal needle. CPP was calculated using the formula CCP = MAP-ICP. All variables were measured every minute for 15 minutes.ResultsThe ICP, MAP and CPP did not differ between the two groups. There were no differences in the highest ICP values in patients receiving either ondansetron or placebo (11 ± 5 versus 9 ± 5,± SD), respectively.ConclusionIntravenous administration of 8 mg ondansetron affects neither cerebral hemodynamics nor ICP.     

Correlation of cerebral perfusion pressure and Glasgow Coma Scale to outcome

Cerebral Perfusion Pressures (CPP) and Glasgow Coma Scale (GCS) scores were monitored to guide the management of severely head-injured patients. These measures were correlated to outcome (Glasgow Outcome Scale-GOS) in 136 consecutive patients at least 1 year after injury. The GOS showed highly significant positive correlations to either CPP or GCS assessments (p less than 0.001). Two parameters that are correlated with subsequent death in most patients include 1) highest (h) GCS = 3 or 4 (Day 1: 31 of 32 patients died, and Day 2: 19 of 19 patients died), and 2) CPP less than or equal to 60 mm Hg more than 33% of the hourly measures during Day 2 (36% of all subsequent deaths; 11% overlap with the highest Glasgow Coma Scale). The Day 2 measures identifying two groups that have a greater than 75% incidence of "good outcome" or GOS = 4 or 5 include 1) hGCS greater than or equal to 6 (N = 45) and 2) the average (a) CPP greater than or equal to 90 mm Hg (N = 26). Of the 45 patients with a GOS = 4 or 5 who had both CPP and GCS recorded on the third day, 44 were identified by these "good outcome" parameters.     

重型颅脑损伤持续颅内压及脑灌注压监护与预后关系

作者对５０例重型颅脑损伤患者（ＧＣＳ３－８分），及５０例伤情与诊断和手术方式基本相似的另一组患者进行颅内压（ＩＣＰ）与脑灌注压（ＣＣＰ）连续监测对比研究。结果表明，监护组除８例ＩＣＰ压力＜２．００ｋＰａ，ＣＰＰ＞９．３３ｋＰａ外，余４２例均有不同程度ＩＣＰ增高与ＣＰＰ降低。这些患者分别为创伤性颅内血肿、广泛性脑挫裂伤、继发性脑水肿或脑肿胀等，均采取积极的手术及综合治疗。死亡率为１４％。非监护组治疗方法与监护组相同，预后较差且并发症多，死亡率为２８％。作者认为，对重型颅脑损伤患者施行连续ＩＣＰ、ＣＰＰ监护，是降低并发症和死亡率，提高疗效的有力措施，具有重要的临床应用价值。