Mechanical Strength Study of a Cranial Implant Using Computational Tools

The human head is sometimes subjected to impact loads that lead to skull fracture or other injuries that require the removal of part of the skull, which is called craniectomy. Consequently, the removed portion is replaced using autologous bone or alloplastic material. The aim of this work is to develop a cranial implant to fulfil a defect created on the skull and then study its mechanical performance by integrating it on a human head finite element model. The material chosen for the implant was PEEK, a thermoplastic polymer that has been recently used in cranioplasty. A6 numerical model head coupled with an implant was subjected to analysis to evaluate two parameters: the number of fixation screws that enhance the performance and ensure the structural integrity of the implant, and the implant’s capacity to protect the brain compared to the integral skull. The main findings point to the fact that, among all tested configurations of screws, the model with eight screws presents better performance when considering the von Mises stress field and the displacement field on the interface between the implant and the skull. Additionally, under the specific analyzed conditions, it is observable that the model with the implant offers more efficient brain protection when compared with the model with the integral skull.

Clinical Significance of Vascular Occlusive Events following Moderate-to-Severe Traumatic Brain Injury: An Observational Cohort Study

Preventing hemorrhage progression is a potential therapeutic opportunity in traumatic brain injury (TBI) management, but its use has been limited by fear of provoking vascular occlusive events (VOEs). However, it is currently unclear whether VOE actually affects outcome in these patients. The aim of this study was to determine incidence, risk factors, and clinical significance of VOE in patients with moderate-to-severe TBI. A retrospective observational cohort study of adults (≥15 years) with moderate-to-severe TBI was performed. The presence of a VOE during hospitalization was noted from hospital charts and radiological reports. Functional outcome, using the Glasgow Outcome Scale (GOS), was assessed at 12 months posttrauma. Univariate and multivariate logistic regressions were used for endpoint assessment. In total, 848 patients were included, with a median admission Glasgow Coma Scale of 7. A VOE was detected in 54 (6.4%) patients, of which cerebral venous thrombosis was the most common (3.2%), followed by pulmonary embolism (1.7%) and deep vein thrombosis (1.3%). Length of ICU stay (p < 0.001), body weight (p = 0.002), and skull fracture (p = 0.004) were independent predictors of VOE. VOE development did not significantly impact 12-month GOS, even after adjusting for potential confounders using propensity score matching. In conclusion, VOE in moderate-to-severe TBI patients was relatively uncommon, and did not affect 12-month GOS. This suggests that the potential benefit of treating bleeding progression might outweigh the risks of VOE.

Evaluation of Sports-Related Concussion in Children (5–12) and Adolescents (13–18)

ObjectiveThe objective of this study was to examine the association between sport/non-sport concussions as well as age and time to recovery after concussion diagnosis in children and adolescents.BackgroundThere is an ongoing debate between policy makers and medical specialists on when is the appropriate time to allow children to begin playing contact sports. This dilemma is important because sports are incredibly prevalent in our child and adolescent population today. There is still significant debate if age at time of concussion diagnosis is associated with long term affects and time to recovery.Design/MethodsOf the 725 patients who received a diagnosis of concussion at Children's of Alabama (COA) from 2018 to 2019, 350 patients were included for retrospective cohort review based on documented recovery data defined as follow up appointment PRN (as needed) or begin return to play protocol. 221 patients were lost to follow up while 7 were excluded for concomitant skull fracture. Recovery time, patient demographic data, symptoms severity score, and injury characteristics were then analyzed for each patient.ResultsOverall, the mean time of recovery after new diagnosis of any concussion was 87.2 days. The mean time to documented recovery in sports-related concussion was 82.6 days compared to 98.5 days in non-sports related concussion. Of note, both the 5–12 and 13–18 age groups had the same mean time to recovery at 87 days.ConclusionsSports related concussion showed decreased mean time to recovery compared to non-sports related concussion. Also, age did not play a factor in time to recovery as there was no difference in the 2 age groups. This data, along with the NCAA-DOD Care Consortium showing repetitive head injury during early adolescence is unrelated to brain health as measured by specific outcome measures, has the potential to provide valuable information for future policy on child and adolescent sports.

A prospective cross-sectional study on the cases in a tertiary care hospital about the patterns of head injury caused by falling from heights

One of the most common injuries and death in India are caused by falling from heights. Although a majority of these bereavements are accidental and are due to a slip from higher altitudes like multi storey buildings, trees, construction sites, etc., alcohol consumption also plays a vital role. In such occurrences of death due to falling from heights, head injury is a very common phenomenon and it complicates the investigation procedure for the investigators and the medico legal experts to arrive at a conclusion because these injuries impersonate the injuries sustained from other accident cases like a road accident per say. Due to the absence of eyewitness in most of these cases, a detailed analysis on the pattern and the nature of the injuries is required to arrive at a conclusion. These injuries sustained vary owing to the site of impact and the stature from where the victim had fallen and the critical answer to the medico legal queries lies in a detailed autopsy of the victim’s body and a thorough examination at the scene of occurrence. On the account of a comprehensive study insufficiency in Tamilnadu, a modest attempt was made to analyse the pattern of head injuries sustained on the victims of fall from different heights and is presented as a cross- sectional study.The case study on the fatal incidents of fall from height was recorded and analysed statically in a sampling of one hundred cases which was subjected to detailed autopsy in a tertiary care hospital. In this analysis the nature and pattern of injuries, data regarding the nature of fall, the site of primary impact, period of survival and a detailed examination of head injuries were all noted. The statistical analysis was carried out using Microsoft Excel 2009.From the analysis, it is observed that the maximum number of fall from height cases seemed to be from the age group of 31 years ~40 years (30%) and males contributed to a majority of these cases (90%). Amongst head injury cases, 82% of the cases had intracranial haemorrhage and 10% had facial bone fractures. In the 82% of cases, 76% of cases had both subarachnoid haemorrhage and subdural haemorrhage. Also skull fracture was seen in 40% of the cases and the base of the skull fracture was noted almost equally in 37% of the cases. Injuries to head and cervical spine constituted to the salient features of primary head impacts, SAH alone is rare in such cases.On the account of observation and analysis, it is noted that most of these cases were accidental in nature (93%) and Males (90%) in the age group of 31-40 years were in highest number (30%). Cranial injuries with subarachnoid and subdural haemorrhage seemed to be the most common cause of death amongst victims falling from heights. Also skull fracture were seen in 40% of the cases and base of skull fracture noted almost equally in 37% of the cases. While SAH alone in rare in these cases, injuries to head and cervical spine were the key impacts of primary head impacts.

Traumatic Head Injury and the Diagnosis of Abuse: A Cluster Analysis

OBJECTIVES: Data guiding abusive head trauma (AHT) diagnosis rest on case-control studies that have been criticized for circularity. We wished to sort children with neurologic injury using mathematical algorithms, without reference to physicians’ diagnoses or predetermined diagnostic criteria, and to compare the results to existing AHT data, physicians’ diagnoses, and a proposed triad of findings. METHODS: Unsupervised cluster analysis of an existing data set regarding 500 young patients with acute head injury hospitalized for intensive care. Three cluster algorithms were used to sort (partition) patients into subpopulations (clusters) on the basis of 32 reliable (κ &gt; 0.6) clinical and radiologic variables. P values and odds ratios (ORs) identified variables most predictive of partitioning. RESULTS: The full cohort partitioned into 2 clusters. Variables substantially (P &lt; .001 and OR &gt; 10 in all 3 cluster algorithms) more prevalent in cluster 1 were imaging indications of brain hypoxemia, ischemia, and/or swelling; acute encephalopathy, particularly when lasting &gt;24 hours; respiratory compromise; subdural hemorrhage or fluid collection; and ophthalmologist-confirmed retinoschisis. Variables substantially (P &lt; .001 and OR &lt; 0.10 in any cluster algorithm) more prevalent in cluster 2 were linear parietal skull fracture and epidural hematoma. Postpartitioning analysis revealed that cluster 1 had a high prevalence of physician-diagnosed abuse. CONCLUSIONS: Three cluster algorithms partitioned the population into 2 clusters without reference to predetermined diagnostic criteria or clinical opinion about the nature of AHT. Clinical difference between clusters replicated differences previously described in comparisons of AHT with non-AHT. Algorithmic partition was predictive of physician diagnosis and of the triad of findings heavily discussed in AHT literature.

Cerebral venous thrombosis with a catch

Background: Cerebral venous thrombosis (CVT) is a rare entity typically occurring in patients in hypercoagulable states. They can also occur in cases of trauma. The symptoms are nonspecific. Case Description: A 28-year-old male presented to the emergency department with a head injury. During the necessary imaging, it was found that he had a depressed skull fracture and other signs of traumatic brain injury. Unbeknownst to the patient and the patient party, it was also revealed that the patient only had one kidney. Wound debridement and excision of the depressed fracture were performed. A postoperative MRI revealed that the patient had CVT. Conclusion: There should be a high index of suspicion for CVT in case of traumatic head injuries. The surgeon should plan management according to the patient’s comorbidities.

Clinic and diagnostics of the non-penetrating gun-shoot craniocerebral injuries in the local war

Objective ‒ to evaluate the features of the clinical manifestations and effectiveness of multi-slice computed tomography (MSCT) of the head for the diagnosis of non-penetrating gun-shoot head injuries in the local war.Materials and methods. The medical data of 155 patients who received a non-penetrating gun-shoot head injuries during the war in the Eastern Ukraine between 2014‒2020 were analyzed. All patients were males between 18 and 60 years (average age ‒ 35.1 years). The peculiarities of clinical manifestations and results of diagnostic evaluation of non-penetrating gun-shoot head injuries during specialized neurosurgical care in medical institutions on the third and fourth levels of medical aid have been studied.Results. Wide diagnostic capabilities of MSCT were revealed for determination of the wounds localization, type of the projectile, the nature of the wound channel, gunshot skull fractures, and associated intracranial injuries. It was found that with non-penetrating bullet and shrapnel tangential cranio-cerebral wounds, incomplete and depressed fractures usually occurred, and with single and multiple shrapnel blind wounds, incomplete ‒ perforated and depressed fractures with the presence of bone fragments. The pathomorphological features of the nature of the wound channels and intracranial injuries were determined. They are always associated by traumatic subarachnoid hemorrhages and brain contusions, in most cases – focal. Intracranial hematomas were observed in 3.1 % of the patients.Conclusions. Clinical manifestations of the non-penetrating craniocerebral gunshot wounds depend not only on the type of cranial soft tissue injury, but also on the nature of the skull fracture and are mainly occurred because of the severity of the traumatic brain injury. MSCT of the head makes it possible to determine the localization of the wound, the type of the wounding projectile, the nature of the cranial soft tissues damage, wound channel, gunshot skull fractures and associated intracranial injuries.

When Minutes Matter: Rapid Infusion in Emergency Care

Purpose of Review This review provides historical context and an update on recent advancements in volume resuscitation for circulatory shock. Emergency department providers who manage critically ill patients with undifferentiated shock will benefit from the insights of early pioneers and an overview of newer techniques which can be used to optimize resuscitation in the first minutes of care. Recent Findings Rapid infusion of fluids and blood products can be a life-saving intervention in the management of circulatory and hemorrhagic shock. Recent controversy over the role of fluid resuscitation in sepsis and trauma management has obscured the importance of early and rapid infusion of sufficient volume to restore circulation and improve organ perfusion. Evidence from high-quality studies demonstrates that rapid and early resuscitation improves patient outcomes. Summary Current practice standards, guidelines, and available literature support the rapid reversal of shock as a key priority in the treatment of hypotension from traumatic and non-traumatic conditions. An improved understanding of the physiologic rationale of rapid infusion and the timing, volume, and methods of fluid delivery will help clinicians improve care for critically ill patients presenting with shock. Clinical Case A 23-year-old male presents to the emergency department (ED) after striking a tree while riding an all-terrain vehicle. On arrival at the scene, first responders found an unconscious patient with an open skull fracture and a Glasgow coma scale score of 3. Bag-valve-mask (BVM) ventilation was initiated, and a semi-rigid cervical collar was placed prior to transport to your ED for stabilization while awaiting air transport to the nearest trauma center. You are the attending emergency medicine physician at a community ED staffed by two attending physicians, two physicians assistants, and six nurses covering 22 beds. On ED arrival, the patient has no spontaneous respiratory effort, and vital signs are as follows: pulse of 140 bpm, blood pressure of 65/30 mmHg, and oxygen saturation 85% while receiving BVM ventilation with 100% oxygen. He is bleeding profusely through a gauze dressing applied to the exposed dura. The prehospital team was unable to establish intravenous access. What are the management priorities for this patient in shock, and how should his hypotension best be addressed?