Marco Piastra

Prognostic factors and outcome of children with severe head injury: an 8-year experience

Abstract.Objectives: Our aim was to analyze prognostic factors and their association with outcome among children with severe head injury. Methods: We conducted a retrospective study among children with severe head injury admitted to our Pediatric Intensive Care Unit (PICU) from November 1992 to December 2000. The patients were immediately evaluated for the severity of head injury (Glasgow Coma Score, GCS), clinical presentation, cerebral axial tomography, early complications (hypoxia and hypotension), metabolic and hematological alterations and early post-traumatic seizures. Six months after injury we applied the Glasgow Outcome Score (GOS). Correlations with GOS were evaluated using univariate and multivariate logistic models. Results: In all, 122 children with severe head injury were identified. The patients presented the following scores: 18 (14.7.0%) children had a GOS of 1; 2 had a GOS of 2 (1.6%); 27 (22.2%) a GOS of 3 and 75 (61.5%) a GOS of 4 or 5. A low GOS was significantly and independently associated with low GCS, multiple trauma, the presence of hypoxia and hypotension, disseminated intravascular coagulation (DIC), hyperglycemia and early post-traumatic seizures. Hematological alterations (white blood cells) were also associated with a low GOS, though not significantly. Conclusion: In addition to GCS, types of trauma and brain lesion, hypoxia and hypotension, hemocoagulative disorders (DIC), hyperglycemia and early post-traumatic seizures are predictors of GOS. A knowledge of these prognostic factors and the correct management of children with severe head injury helps clinicians to improve outcome and to reduce morbidity and mortality.

Early post-traumatic seizures in children with head injury.

Abstract Post-traumatic seizures (PTS) can be a serious complication of head injury, because they can cause secondary brain damage through increased metabolic requirements, raised intracranial pressure, cerebral hypoxia, and/or excessive release of neurotransmitters. In children, early PTS are more frequent than late ones. In this retrospective study we conducted an epidemiological analysis and tried to identify potential risk factors for the onset of early PTS in children hospitalized for head injury in our Paediatric Intensive Care Unit. The severity of injury was assessed using the Glasgow Coma Scale (GCS), while the outcome of traumatized children was defined using the Glasgow Outcome Score (GOS). Early PTS were diagnosed in 15 out of the 125 children hospitalized (12%). Most of the children (73.3%), developed seizures within 24 h of the trauma (immediate PTS). Among the risk factors, a very important role was played by the severity of the injury; in fact, the incidence of early PTS among patients with GCS≤8 was ten times greater than that among children with GCS 13–15. Other risk factors that significantly influenced the onset of early PTS, were age (60% of children with early PTS were less than 3 years old) and severe cerebral edema. Overall, children with early PTS had a worse outcome than the other patients. In fact, 53% had a GOS of ≤3 compared to 19.1% of those without early PTS (P<001). In particular, considering children with severe head injury, 80% of those with early PTS had a GOS of ≤ 3, compared to 41% of those without early PTS (P<0.05). In conclusion, PTS can be a serious complication of head injury in children, because they can worsen secondary brain damage. Appropriate management of head-trauma patients must include suitable and immediate prophylaxis with anti-epileptic drugs.

Management of status dystonicus: Our experience and review of the literature

Status dystonicus (SD) is a life threatening disorder that develops in patients with both primary and secondary dystonia, characterized by acute worsening of symptoms with generalized and severe muscle contractions. To date, no information is available on the best way to treat this disorder. We review the previously described cases of SD and two new cases are reported, one of which occurring in a child with static encephalopathy, and the other one in a patient with pantothenate kinase‐associated neurodegeneration. Both patients were admitted to an intensive care unit and treated with midazolam and propofol. This approach proved to be useful in the former while the progressive nature of the dystonia of the second patient required the combination of intrathecal baclofen infusion and bilateral pallidal deep brain stimulation. We believe that a rapid and aggressive approach is justified to avoid the great morbidity and mortality which characterize SD. Our experience, combined with the data available in the literature, might permit to establish the best strategies in managing this rare and severe condition.

Hemimegalencephaly: clinical implications and surgical treatment

IntroductionHemimegalencephaly (HME) is a quite rare malformation of the cortical development arising from an abnormal proliferation of anomalous neuronal and glial cells that generally leads to the hypertrophy of the whole affected cerebral hemisphere. The pathogenesis of such a complex malformation is still unknown even though several hypotheses are reported in literature.BackgroundHME can occur alone or associated with neurocutaneous disorders, such as neurofibromatosis, epidermal nevus syndrome, Ito’s hypomelanosis, and Klippel–Trenonay–Weber syndrome. The clinical picture is usually dominated by a severe and drug-resistant epilepsy. Other common findings are represented by macrocrania, mean/severe mental retardation, unilateral motor deficit, and hemianopia. The EEG shows different abnormal patterns, mainly characterized by suppression burst and/or hemihypsarrhythmia. Although neuroimaging and histologic investigations often show typical findings (enlarged hemisphere, malformed ventricular system, alteration of the normal gyration), the differential diagnosis with other disorders of the neuronal and glial proliferation may be difficult to obtain. Hemispherectomy/hemispherotomy is the most effective treatment to control seizure, and it also seems to provide good results on the psychomotor development when performed early, as demonstrated by the literature review and by the reported personal series reported here (20 children). The surgical therapy of HME, however, is still burdened by a quite high complication rate and mortality risk.

'No allogeneic blood transfusion' protocol for the surgical correction of craniosynostoses. II. Clinical application

Abstract The authors describe the results obtained in 13 consecutive cases of craniosynostosis operated on according to a protocol devised at avoiding allogeneic blood transfusion. The protocol is based on pre- and postoperative treatment with erythropoietin, preoperative autologous blood donation, preoperative normovolemic hemodilution and intraoperative blood salvage. Nine subjects were affected by simple forms of craniosynostosis, whereas the remaining 4 presented with oxycephaly or craniofacial syndromes. Five of the 13 children were under 7 months and a further 3, under 10 months of age at the time of the surgical operation. Seven children weighed less than 10 kg. Allogeneic blood transfusion was avoided in 11 of the 13 children considered. Two failures – defined as the necessity to reinfuse the patient with an allogeneic blood transfusion – were recorded, 1 of them resulting from an unexpected hemorrhage during surgery. The results obtained indicate that this protocol designed to avoid allogeneic blood transfusion can be safely applied in the great majority of children with craniosynostosis, even when the surgical correction is carried out early in life.

The influence of hemocoagulative disorders on the outcome of children with head injury.

Background: Although disseminated intravascular coagulation (DIC) and other hemocoagulative abnormalities are severe complications of head injury, their effect on clinical outcome remains unclear, particularly among children. Objectives: To evaluate the frequency of hemocoagulative abnormalities and their influence on outcome among children with head injury. Study Design: We conducted a prospective observational study among 60 children with head injury, immediately evaluating severity of head injury (Glasgow Coma Scale, GCS); cerebral axial tomography; prothrombin time; activated partial thromboplastin time (aPTT); fibrinogen level; concentration of fibrin-fibrinogen degradation products (FDP), and platelet count. Two months after injury, we applied the Glasgow Outcome Score (GOS). Associations with GOS were evaluated using univariate and multivariate logistic models. Results: Among children with severe head injury, 22.2% (6/27) developed DIC, all of whom died and had shown severe brain edema. Among those with severe head injury yet without DIC, the mortality was only 14.2%. A low GOS was significantly and independently associated with a low GCS, multiple trauma, delayed aPTT, low fibrinogen level, elevated FDP and low platelet count. Brain edema was also associated with a low GOS, though not significantly. Conclusions: In addition to GCS, type of trauma, type of brain lesion and certain coagulation abnormalities are predictors of GOS.

'No allogeneic blood transfusion' protocol for the surgical correction of craniosynostoses. I. Rationale

Abstract Improved anesthesiological and surgical care has resulted in a progressively declining need for allogeneic blood transfusion. In infants with craniosynostosis, however, allogeneic blood transfusion is still performed as a routine procedure. In the present paper, the authors describe a protocol they have devised with the aim of limiting or even avoiding allogeneic blood transfusion even in very young patients, consequently avoiding the risks of infective or immunologic reactions associated with the procedure. The protocol is based on stimulation of the hematopoietic system with erythropoietin, selection of an appropriate age for operation when a favorable balance between fetal and adult-type hemoglobin is established (that is after 4–6 months), preoperative preparation of the autologous blood supply, and intraoperative blood salvage.

Salicylate intoxication using a skin ointment

Acute percutaneous salicylate intoxication is a rare event in children but can happen with a skin disease where salicylic acid, used as a keratolytic ointment, can be absorbed transcutaneously. Until now, few cases of transcutaneous salicylate intoxication have been reported in the literature. Our case report is about a 5‐year‐old girl with lamellar ichthyosis and an acute salicylate transcutaneous intoxication after the application of a skin ointment. The child had a fever, hyperpnoea with respiratory alkalosis, comatose state and oculogyric crisis. We would like to emphasize the danger of applying salicylic acid in children with extensive skin diseases and, therefore, it is advisable to measure the plasma salicylic levels so as to prevent eventual salicylate toxicity.

Safety and Efficacy of Remifentanil in Craniosynostosis Repair in Children Less than 1 Year Old

Few studies on analgesia with remifentanil (Rf) in children are available, and there are no data on the use of this drug in pediatric neurosurgery. Rf is a new μ-receptor opioid agonist, acting through the activation of pain inhibitory mechanisms. We conducted a prospective trial on the analgesic effects of Rf in 20 children less than 1 year of age undergoing a neurosurgical procedure for craniosynostosis repair. Rf was administered at doses of 0.25 μg/kg/min, by continuous infusion, 1 h after admission to the pediatric intensive care unit (PICU). The treatment was prolonged for 12 h after the operation. The postoperative pain was evaluated in our PICU, comparing the changing of behavioral (AFS and CHEOPS score) and hemodynamic (heart rate, respiratory rate, systolic and diastolic blood pressure, oxygen saturation, O2 and CO2 partial pressure) parameters, before and after treatment with Rf. This drug showed a satisfactory pain control in all the children treated. No significant side effects were noticed, except for one episode of urinary retention. In conclusion, Rf appears to be safe and effective for the treatment of acute pain in the very young child submitted to craniosynostosis repair.

Preemptive analgesia with tramadol and fentanyl in pediatric neurosurgery.

Abstract Preemptive analgesia is based on administration of an analgesic before a painful stimulus generates, so as to prevent the subsequent rebound mechanism. Tissue injury results in disruption of the processing mechanisms of noxious stimuli afferent to the CNS (central nervous system) by way of an increase of inputs in the spinal cord. These reactions may be reduced by the administration of opioids. Few studies on preemptive analgesia with opioids in children are available, and none of them is concerned with pediatric neurosurgery. Tramadol and fentanyl are synthetic opioids which are relatively new and act through the activation of pain-inhibitory mechanisms. We conducted a randomized, prospective trial on the preemptive effects in children of these two analgesic drugs, administered according to three different protocols: tramadol as a bolus (1 mg/kg); tramadol by continuous infusion (150 µg/kg per h); fentanyl by continuous infusion (2 µg/kg per h). In all, 42 children undergoing major neurosurgical operations were enrolled in the study, 14 in each treatment group. Each treatment was started at the induction of general anesthesia and continued throughout the entire duration of the operation. The postoperative pain evaluation was conducted in the Pediatric Intensive Care Unit at the end of the surgical operations and involved comparison of any changes in behavioral (AFS scale and CHEOPS score) and hemodynamic (heart rate, respiratory rate, systolic and diastolic arterial pressure, oxygen saturation, O2 and CO2 partial pressure) parameters. Only 2 children, both in group A, needed further drug administration postoperatively. No significant side effects were noticed in any of the three groups, except that in group A there was a higher incidence of nausea and vomiting. Tramadol efficacy seems to be better when it is administered in continuous infusion; this treatment modality also leads to fewer adverse effects. Fentanyl, in contrast, proved to be superior to tramadol in the treatment of postoperative pain. In conclusion, preemptive analgesia is a valid technique for the treatment of acute pain in children undergoing major neurosurgical operations.