Traumatic brain injury in older adults: characteristics, causes and consequences

INTRODUCTION

Traumatic brain injury is of particular concern in the older population. We aimed to examine the trends in hospitalisations, causes and consequences of TBI in older adults in New South Wales, Australia.

METHODS

TBI cases from 1 July 1998 to 30 June 2011 were identified from hospitalisation data for all public and private hospitals in NSW. Direct aged standardised admission rates were calculated. Negative binomial regression modelling was used to examine the statistical significance of changes in trend over time.

RESULTS

There were 12,564 hospitalisations for TBI over the 13 year study period. Hospitalisation rates for TBI among the older population increased by 7.2% (95% CI 6.4-8.0, p<.0001) per year from 65.3/100,000 to 151.8/100,000. [corrected]. Males had a consistently higher hospitalisation rate. Just under one third of all hospitalisations were for adults aged 85 years and over. Traumatic subdural haemorrhage (42.9%), concussive injury (24.1%) and traumatic subarachnoid haemorrhage (12.7%) were the most common type of injury. Falls were the most common cause of TBI (82.9%). Rates of fall-related TBI increased by 8.4% (95% CI 7.5-9.3, p<.001) per year, whilst non-fall related head injury increased by 2.1% (95% CI 0.9-3.3, p<.0001) per year. The majority of falls were as a result of a fall on the same level and occurred at home. 13% of hospitalisations resulted in death, and the majority occurred in those who sustained a traumatic subdural haemorrhage.

CONCLUSIONS

The rapid increase in hospitalised TBI is being predominantly driven by falls in the oldest old and the greatest increase predominantly in intracranial haemorrhages, highlighting the need for future research to quantify the risk versus benefit of anticoagulant therapies.

[Hemorrhage in vitamin K deficiency--a preventable entity]

Der diaplazentare Transport von Vitamin K ist kaum messbar, die Muttermilch ist arm an Vitamin K und die intestinale Flora von Neugeborenen produziert praktisch kein Vitamin K. Deshalb weisen gesunde Neugeborene «physiologischerweise» tiefe Vitamin-K-Spiegel auf, was durch Verminderung der Vitamin-K-abhängigen Gerinnungsfaktoren zu schweren Mangelblutungen führen kann. Die klassische Form der Vitamin-K-Mangelblutung tritt mit einer Inzidenz von bis zu 1.5% bis zum 7. Lebenstag auf, die Spätform wird bis zur 12. Lebenswoche bei bis zu 10 von 100000 Neugeborenen festgestellt. Mit einer adäquaten Vitamin-K-Prophylaxe lassen sich Vitamin-K-Mangelblutungen grösstenteils verhindern. Die heute in der Schweiz empfohlene Prophylaxe von 3 oralen Dosen à 2 mg Konakion® MM in der 4. Lebensstunde, am 4. Lebenstag und in der 4. Lebenswoche ist bezüglich unerwünschter Nebenwirkung äusserst sicher, insbesondere besteht kein erhöhtes Krebsrisiko. Angesichts der dramatischen Folgen der häufig intrakraniell lokalisierten Vitamin-K-Mangelblutungen ist sowohl bei medizinischen Fachpersonen als auch bei den Eltern eine möglichst gute Compliance für diese einfache und sichere Prophylaxe wie auch eine entsprechende Aufklärung anzustreben.

The use of recombinant factor VIIa (NovoSeven) for treatment of active or impending bleeding in brain injury: broadening the indications

We report three patients with severe traumatic brain injury, both open and closed, who were treated with recombinant activated factor VII. This treatment was given in a desperate, last-ditch effort to save the life of patient 1, as a preventive or early treatment of a developing hematoma in patient 2, and as treatment of a threatening hematoma in patient 3. One of the three patients survived. During the past few years we have broadened the indications for recombinant activated factor VII and started using it as a preventive measure rather than as a "last line of defense." However, the potential complications of disseminated intravascular coagulation and thrombotic events, as well as the cost-effectiveness in view of the available evidence-based medicine, should be considered.

Recent research and views on shaking baby syndrome

Primary care physicians and psychiatrists should be aware of the incidence, causes, diagnosis, and prognosis of the conditions of Shaking Baby Syndrome (SBS). This article discusses both accidental and non-accidental head injury, and also addresses the legal aspects of SBS. Incidence, potential causes, explanations, prevention, and treatment of the condition, both for the perpetrators and the unfortunate victims, are considered. Of special importance is the fact that SBS is difficult to diagnose with absolute certainty. Hence the identification of a potential perpetrator can be difficult and injustices can occur.

Spinal anaesthesia and the use of anticoagulants

This chapter addresses the increasing incidence of spinal haematoma after central neuraxis anaesthesia in patients receiving drugs that affect coagulation. Administration of low-molecular-weight heparins in the perioperative period is highlighted because these drugs remain the 'gold standard' for prophylaxis against deep-vein thrombosis. The performance of spinal anaesthesia in patients already receiving antiplatelet drugs is discussed--as well as special warnings in such a setting. In addition, issues such as those concerning the administration of unfractionated heparin, anti-vitamin K drugs or new antiplatelet and antithrombotic medications are addressed. Finally, specific recommendations regarding each class of drug are defined in order to avoid the occurrence of a rare but catastrophic event such as spinal haematoma.

Brain injury-related fatalities in American football, 1945-1999

OBJECTIVE

Brain injuries have been the most common direct cause of death among American football players since the annual recording of football-related deaths began in 1931. This study examines the 55-year experience with brain injury-related fatalities in American football from 1945 to 1999, including not only the incidence but also the cause of death in discrete 5-year spans to focus on the variables that have either increased or decreased fatalities. In addition, we describe the types of injuries that have occurred, the activities in which the players were engaged at the time of injury, the level of play involved, and whether the injuries occurred during games or in practice sessions.

METHODS

Data were collected nationwide regarding football fatalities in all organized football programs in public schools and in college, professional, and youth programs by conducting personal interviews and eliciting responses to questionnaires. The information collected included demographic data about the injured player, equipment data, injury type and body part involved, and pertinent information regarding the exact circumstances of the accident.

RESULTS

We found that a total of 497 brain injury-related fatalities occurred among American football players during the period from 1945 through 1999. The causes of death were brain injuries in 69% of the cases, cervical spine injuries in 16%, and other injuries in 15%. Subdural hematoma was the type of injury associated with the majority (429, 86%) of brain injury-related fatalities. A majority (61%) of the brain injury-related fatalities occurred during participation in football games, and 75% of these were high school players. It should be noted that the number of high school football players is far greater (more than 1 million) than the number of either college (approximately 75,000) or professional (approximately 2000) players. The most frequent on-field activity involved when players sustained their fatal injuries was either tackling or being tackled (35%).

CONCLUSION

Brain injury-related fatalities accounted for 69% of all football fatalities from 1945 through 1999. The greatest number and percentage of brain injury-related fatalities occurred during the 5-year span from 1965 through 1969, and the smallest number and percentage occurred during the 2 decades from 1975 through 1994. Most brain injury-related fatalities involved a subdural hematoma sustained by high school football players while either tackling or being tackled in a game. In the 2 decades from 1975 through 1994, there was a dramatic reduction in these fatalities, and the preventive measures that have received most of the credit are 1) the 1976 rule change that prohibits initial contact with the head and face when blocking and tackling and 2) the National Operating Committee on Standards for Athletic Equipment helmet standard, which went into effect in colleges in 1978 and in high schools in 1980.

Ischemic preconditioning reduces infarct volume after subdural hematoma in the rat

The aim of the present study was to investigate the effects of ischemic preconditioning on infarct volume in a rat model of subdural hematoma (SDH). Ischemic preconditioning was induced by 15 min transient middle cerebral artery (MCA) occlusion followed 3 days later by the injection of 300 microl of autologous venous blood into the subdural space. Preconditioning significantly reduced the volume of cortical infarction (by 26%, P<0.001) 24 h after SDH induction, but not brain swelling (P>0.05) relative to sham-operated non-preconditioned animals. These data support the view that ischemic preconditioning reduces ischemic brain damage in this rat model of SDH.

Do microelectrode techniques increase accuracy or decrease risks in pallidotomy and deep brain stimulation? A critical review of the literature

Several recent publications have stated that the use of microelectrode recording (MER) during pallidotomy or deep brain stimulation (DBS) contributes to decreasing risks and side effects of surgery, and that such a technique is a prerequisite for minimizing lesion size and for accurate placement of the stereotactic lesion or the DBS electrode. To evaluate the consistency of these statements, we reviewed hundreds of papers and congress reports on MER- and non-MER-guided procedures published since 1992. This review showed that MER groups published more often than non-MER groups. While side effects of surgery were not uncommon in both groups, the rate of severe complications, such as hematoma, and mortality appeared to be higher when microelectrodes were used, both in ablative surgery and in DBS procedures. Besides, the nonaccurate placement of lesions or DBS electrodes, as assessed on published MRI figures, was not uncommon in MER publications. Lesion volume was, when reported, not different in both techniques. The electrical parameters of stimulation of implanted electrodes in the thalamic ventral intermediate (Vim) nucleus for treatment of tremor were higher in MER-guided surgery. The available literature suggests that MER techniques may increase the risks of surgery without enhancing its accuracy, compared to MRI-based macrostimulation techniques. To date, there is no randomized trial by one and the same group on the use of micro- versus macroelectrodes in surgery for movement disorders. A prerequisite for such a trial in the future must imply that the investigators have an equal nonprejudiced attitude towards, and equal confidence and experience in, either technique. Since such a prerequisite does not exist so far in the functional stereotactic community, a critical and comparative study of the available literature remains the only way to evaluate the pros and cons of either technique, in terms of targeting accuracy and surgical complications.

Extradural haematoma--a preventable cause of death

Traumatic extradural haematoma (EDH) complicates 1-4% of all head injuries and is a major factor contributing to morbidity and mortality. Clinical awareness and early diagnosis are the keys to successful management. With the advent of computerised tomographic (CT) scanning a trend towards 'zero mortality' has been reported. We report four adolescent cases presenting with mild head injury (Glascow Coma Score 13-15) who subsequently died as a result of EDH. We suggest that excessive delay both in recognising the condition and the subsequent referral and transfer are factors contributing to the mortality of these patients.

Intracranial hematoma in experienced teenage equestrians

Intracranial hematoma in pediatric equestrians is rare, notwithstanding the lack of uniform standards and requirements for the use of protective headgear during equestrian events. We report two teenage helmeted equestrians who sustained severe head trauma with intracranial hematoma due to falls during equestrian events. Current recommendations for the use of equestrian headgear are reviewed.

Childhood deaths from physical abuse

This paper gives a detailed account of 30 cases of childhood deaths caused by physical abuse, detected by the Suspected Child Abuse and Neglect (SCAN) team, General Hospital, Kuala Lumpur. They consisted of 12 Malays, 6 Chinese, 9 Indian, and 1 Indonesian child. Three cases could not be ascertained as to their ethnic origin. There were 13 male and 17 female children. The average age of the abused children was 2 years 5 months. The most frequent causes of death were intracranial hemorrhage and intraabdominal trauma. Of the 17 cases of intracranial hemorrhage, only four had X-ray evidence of skull fracture. This suggests the possibility of whiplash injuries with/without the abuser suspecting that he/she had injured the child. Of the 22 abusers who could be identified, there was no sex differentiation. Fathers formed the largest group of perpetrators, followed by mothers and childminders. Fifteen of the natural parents of the abused children were married, four were divorced and four were never married. Five of the abusers had aggressive personalities and three were drug addicts. Only one abuser was found to be an alcoholic even though a few were also under suspicion. For most cases, trigger factors could not be identified.

Incidence and causes of intracranial hemorrhage in infancy: a prospective surveillance study after vitamin K prophylaxis

In order to evaluate the effect of vitamin K prophylaxis on the incidence of intracranial hemorrhage (ICH) in infants aged from 1 week to 12 months, a prospective surveillance study, from 1974 to 1988, was performed on the well-defined population of Nagasaki Prefecture, Japan. The incidence of ICH in infancy markedly decreased, from 34.3/100,000 to 10.1/100,000 live births, with the oral administration of vitamin K2 at both birth and 1 week, or with additional supplementation at 1 month of age. The diminished incidence was attributed to the decreased occurrence of acute ICH due to late hemorrhagic disease (LHD), a late onset form of vitamin K deficiency, and chronic subdural hematoma. On comparing the possible etiological factors, and clinical and laboratory findings between these 2 groups, it became apparent that chronic subdural hematoma shared some etiological factors (such as breast-feeding, liver dysfunction and no supplementation of vitamin K) with LHD. Furthermore, chronic subdural hematoma developed in some patients who had previously had acute ICH due to LHD. These findings suggest that coagulopathy due to vitamin K deficiency, including LHD, is causally related in the majority of, if not all, cases of chronic subdural hematoma without any history of trauma or central nervous system infections.

[Repeated intracranial hemorrhages, their prevention and treatment]

The formation of recurrent hematomas was encountered in patients operated on for intracranial hematomas of traumatic and nontraumatic origin and for contusion of the brain. To prevent recurrent hemorrhages, the authors employed active aspiration of the wound canal contents by means of a three-jar aspirator or a microaspirator in the postoperatice period in 56 cases. It is noted that active aspiration of the wound discharge, continued for 2--4 days, makes it possible to avoid the formation of recurrent intracranial hematoma and to reduce resorption of the decomposition products, this improves the course of the postoperative period.

Subdural hematoma following open-heart operations

Six patients who died following open-heart operations were found at postmortem examination to have acute subdural hematomas. On the basis of the clinical and postmortem findings, two factors in the pathogenesis of the hemorrhage are postulated. In the presence of intraoperative heparin administration, significant hematoma formation may result from damage to the bridging dural veins from minor, inadvertent head trauma or alterations in cerebral volume from fluid shifts. Manipulation of the head in patients who have been given heparin should be undertaken with extreme care, particularly in infants. In any patient with neurological dysfunction who has also had an open-heart operation, the possibility of an expanding subdural hematoma must be considered.

Anti-siphon and reversible occlusion valves for shunting in hydrocephalus and preventing post-shunt subdural hematomas

✓ An anti-siphoning valve for use in hydrocephalic shunt systems is described. The addition of this valve to the system effectively reduces the hazard of negative intraventricular pressure when the patient is sitting or standing. The formation of post-shunt subdural hematomas was prevented by temporary postoperative occlusion of the shunt using a percutaneously reversible occlusion valve, which is also described.