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REVIEW article

Front. Neurol., 17 September 2024
Sec. Neurotrauma
This article is part of the Research Topic Assessment and Treatment Interventions for Traumatic Brain Injury View all 18 articles

Global traumatic brain injury intracranial pressure: from monitoring to surgical decision

Dan ZhangDan Zhang1Yanzhi ShengYanzhi Sheng2Chengbin WangChengbin Wang2Wei ChenWei Chen1Xiaofeng Shi
Xiaofeng Shi1*
  • 1Longgang Central Hospital of Shenzhen, Guangdong, China
  • 2Shenzhen College of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangdong, China

Traumatic brain injury (TBI) is a significant global public health issue, heavily impacting human health, especially in low-and middle-income areas. Despite numerous guidelines and consensus statements, TBI fatality rates remain high. The pathogenesis of severe TBI is closely linked to rising intracranial pressure (ICP). Elevated intracranial pressure can lead to cerebral herniation, resulting in respiratory and circulatory collapse, and ultimately, death. Managing intracranial pressure (ICP) is crucial in neuro-intensive care. Timely diagnosis and precise treatment of elevated ICP are essential. ICP monitoring provides real-time insights into a patient’s condition, offering invaluable guidance for comprehensive management. ICP monitoring and standardization can effectively reduce secondary nerve damage, lowering morbidity and mortality rates. Accurately assessing and using true ICP values to manage TBI patients still depends on doctors’ clinical experience. This review discusses: (a) Epidemiological disparities of traumatic brain injuries across countries with different income levels worldwide; (b) The significance and function of ICP monitoring; (c) Current status and challenges of ICP monitoring; (d) The impact of decompressive craniectomy on reducing intracranial pressure; and (e) Management of TBI in diverse income countries. We suggest a thorough evaluation of ICP monitoring, head CT findings, and GCS scores before deciding on decompressive craniectomy. Personalized treatment should be emphasized to assess the need for surgical decompression in TBI patients, offering crucial insights for clinical decision-making.

Introduction

Traumatic brain injury (TBI) is the leading cause of disability and death among young people worldwide. TBI often leads to increased intracranial pressure, reducing cerebral perfusion pressure and causing cerebral ischemia (1). In particular within low-and middle-income countries, the incidence of TBI is the highest, and the mortality rate is also the highest (2). Severe TBI (sTBI) Management depends on mitigating secondary brain injury (35). In this scenario, medically refractory intracranial hypertension after sTBI is the most common cause of death (6). Monitoring intracranial pressure (ICP) is essential in managing severe traumatic brain injury, guiding both pharmacological and surgical treatments (7). The National Brain Trauma Foundation guidelines recommend the use of invasive ICP monitoring (IIB level of evidence) (8). To reduce secondary brain damage, high ICP is associated with high mortality and dysfunction in TBI patients. It is currently believed that patients with severe TBI require immediate treatment when the ICP is >22 mmHg (8). However, there has been controversy about this threshold in clinical management. At present, there is no level I evidence to support the use of clinical interventions to target a specific ICP threshold (9). Decompressive craniectomy (DC) stands as a crucial measure in mitigating intracranial pressure among patients, playing a pivotal role in their management (10, 11). Nevertheless, the efficacy of decompressive craniectomy in the treatment of severe head injury has remained a subject of ongoing controversy (12). Craniectomy decompression has the potential to trigger a range of intricate complications, it can even result in severe sequelae (13). Despite the ongoing controversy surrounding it, craniectomy decompression remains the ultimate life-saving procedure for patients suffering from refractory intracranial hypertension. For patients with refractory intracranial hypertension, there is no clear consensus on whether doctors continue to perform conservative treatments for decompression or immediately perform decompressive craniectomy (14). Regarding patients with refractory intracranial hypertension, there exists a lack of a clear consensus among medical professionals on whether to persist with conservative treatment methods for decompression or promptly proceed with decompressive craniectomy (15). The aim of our narrative review is to concisely elaborate on the significance and worth of contemporary intracranial pressure monitoring in patients presenting with elevated intracranial pressure, while simultaneously delving into the prevailing challenges and dilemmas surrounding its application. The main focus of the final review is to summarize the thorough assessment of ICP monitoring, head CT findings, and GCS scores for clinical surgical decisions.

In this review, we conducted a comprehensive evaluation of the disparities in morbidity and mortality rates associated with TBI across various income countries. Furthermore, we delved into the advancements made in ICP monitoring among TBI patients and discussed the application of ICP monitoring across different income nations. At the same time, the role of decompressive craniectomy in patients with TBI is summarized. Finally, we put forward ideas for the direction of future research and clinical services.

The epidemiology of TBI

The majority of the global population resides in low-and middle-income countries (LMIC), where the prevalence of TBI is very high. TBI poses a significant public health challenge, imposing a substantial economic burden on both nations and the world at large (16). The incidence of TBI in LMIC is triple that of high-income countries (HIC), as indicated by available data (17). Utilizing mathematical modeling, researchers have estimated the incidence of TBI in nations with varying income levels globally. The incidence of TBI in low-and middle-income countries accounts for 72% of the global incidence of TBI, and the results are listed in Figure 1A (17). In these countries, acquiring adequate healthcare resources remains a significant challenge. People living in low-and middle-income nations face a much higher risk of fatality from severe TBI, with the likelihood being twice as high as that in high-income countries (18). The total number of deaths is shown in Figure 1B. The decrease in mortality rates among patients with severe TBI in high-income countries may potentially stem from disparities in the quality and accessibility of medical care. TBI patients frequently exhibit a concomitant elevation in ICP. According to estimates, the ICP monitoring rate in the United States is 77.4% (19), Australia and New Zealand is 44.5% (20), Canada is 63% (21), and Europe is 37% (22), 11% in China (23), the data is shown in Figure 1C. In high-income countries, the rate of brain injuries among the elderly is gradually climbing, with a growing proportion of these injuries being caused by falls (24). In low-and middle-income countries, road traffic collisions continue to top the list as the leading cause of brain trauma (25). These epidemiological data consistently demonstrate significant disparities in the occurrence of TBI between high-income countries and their low-and middle-income counterparts. For low-and middle-income countries, individualized treatment may be required based on the clinical experience of clinicians. In comparison to HICs, the scarcity of intensive care capabilities among neurosurgeons in LMICs poses a significant hindrance to effective management, given that LMICs often have limited access to intensive care, and even in capable situations. The available resources are also very limited (26). Consequently, in numerous low-and middle-income countries, patients suffering from severe TBI are unable to receive proactive and comprehensive intensive care. Nursing interventions such as body position and tracheal suctioning can affect the change of intracranial pressure in patients with TBI (27, 28). Nursing operations should be carried out under close monitoring (2). In developed nations replete with a plethora of medical resources, TBI might exhibit relatively consistent trends, irrespective of external factors such as nursing interventions. However, In LMICs, limited medical resources often lead to insufficient numbers and capacity of medical personnel to meet patient needs (29). The implementation of intracranial pressure management methods recommended by guidelines, such as deep analgesia, sedation, and muscle relaxation, is frequently difficult to implement (8). Because analgesia and sedation necessitate continuous vigilant bedside monitoring by nurses, muscle relaxation demands a titrated treatment. The vast majority of patients failed to undergo therapeutic interventions deep sedation for the purpose of reducing intracranial pressure, nor were they administered muscle relaxation titration therapy (30). This led to significant variability in the ICP levels observed among TBI patients. Therefore, TBI management guidelines based on intracranial pressure are difficult to be properly applied in low-and middle-income countries. A multicenter randomized controlled trial (RCT) conducted in the integrated ICU of LMIC (such as Bolivia and Ecuador) compared the differences between two TBI management strategies, one of which was based on ICP and the other did not (31). In view of the increasing differences in resources and epidemiology between LMIC and HIC, the trials conducted in this case may not be enough to show that management based on ICP monitoring has no advantages (32). In the future, conducting more RCT studies for low-TBI populations in low-and middle-income countries is a key direction.

Figure 1
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Figure 1. Incidence rate of TBI in countries with different income levels in the world. (A) Incidence of TBI worldwide WHO region. (B) Differences in mortality of TBI by country-income group. (C) TBI in different regions use ICP monitoring.

However, a preponderance of studies and clinical trials pertaining to TBI are typically conducted in high-income nations, and some patients recruited to LMIC should be given more attention (19). Translating HIC research findings to LMICs is challenging due to their limited access to intensive care and scarce resources, even when available. A recent survey revealed that LMIC neurosurgeons’ lack of intensive care competence, in contrast to HICs, poses a significant hurdle in patient management (33).

The importance and role of intracranial pressure monitoring

Neurosurgery patients with TBI are critically patients, and their condition changes rapidly (34). ICP is one of the main complications of traumatic brain injury (33). A substantial body of cohort studies has consistently demonstrated that ICP is independently associated with an elevated risk of mortality and poor prognosis. Therefore, the core of strict management of TBI patients lies in the management of elevated ICP (3537). According to the changes in ICP, combined with the changes in the patient’s consciousness, pupils and vital signs, it can be timely and accurately judged and found changes and the development of the patient’s condition and timing of effective rescue (38). ICP monitoring can accurately reflect changes in intracranial pressure (39). According to the Fourth Edition Guidelines of the Trauma Foundation (8), TBI patients presenting with a GCS score ranging from 3 to 8 and exhibiting abnormal head CT scans should undergo ICP monitoring upon regaining consciousness. Abnormal CT scans of the head typically encompass a range of pathologies, including hematoma, contusion, swelling, herniation, and compression of the basal cistern (40). Furthermore, for patients who have sustained severe TBI and been admitted to the hospital with normal cranial CT scans, intracranial pressure ought to be meticulously monitored if they exhibit ≥2 of the following characteristics: age over 40 years; unilateral or bilateral limb dyskinesia; systolic blood pressure (blood pressure) < 90 mmHg (41). The consensus among experts, as outlined in these guidelines, underscores the necessity for ICP monitoring and management of patients suffering from TBI. In an observational study, the implementation of ICP monitoring correlated with a diminished risk of fatality (42). A study utilizing a vast prospectively collected database analyzed the impact of ICP reduction interventions on the 2-week mortality of patients with severe TBI treated with or without an ICP monitor. In patients with severe TBI who are treated with intracranial hypertension, the use of an ICP monitoring can significantly reduce the mortality rate compared with patients who are not treated with an ICP monitoring (43). Another study delved into the trials and case series pertaining to the treatment of severe closed TBI, meticulously analyzing both the mortality rates and the favorable outcomes 6 months post-injury. Active ICP monitoring and treatment of patients with severe TBI can significantly improve the prognosis (44). A prospective observational study meticulously assessed the impact of intraventricular ICP monitoring on the prognosis of elderly patients suffering from severe TBI. It has been found through research that the implementation of intraventricular ICP monitoring can mitigate the gravity of in-hospital mortality rates among geriatric patients who have sustained TBI, and improve their 6-month post-injury prognoses (45). A Meta-Analysis since the third edition of “Brain Injury Treatment Guidelines” shows the results (Including “Indications for Intracranial Pressure Monitoring”), with severe TBI monitored by ICP, an excellent survival rate has been observed (46). In cases of severe TBI, an elevation in ICP is intricately linked to mortality and an unfavorable clinical prognosis (47). The main goal of ICP monitoring in TBI is to be able to detect secondary injuries early and implement therapeutic interventions immediately (48). Although a randomized study showed that continuous monitoring of ICP in patients with TBI did not improve the prognosis compared with nursing care, however, based on imaging and clinical examination (49), there are significant differences in treatment plans between the two groups in this study. It does not endeavor to evaluate the inherent worth of ICP monitoring, but rather employs two distinct methodologies to ascertain the effectiveness of intracranial hypertension management. The core value of ICP monitoring is to guide the correct treatment strategy, so there is no need to use the evidence in this study to show that ICP monitoring has no value or can be used as an argument against the use of ICP monitoring (12). The implementation of long-term continuous ICP monitoring is advantageous, as the patterns of ICP variation can serve as a guiding principle for individualized treatment (50). In addition, ICP monitoring combined with other nervous system monitoring helps to understand the pathophysiological process of injury (51). Drawing upon clinical practice and literature reports, we provide a overview of the specific performance of ICP monitoring. The value of the following aspects: (a) Early judgment of the patient’s prognosis; (b) Judge whether to perform craniotomy and decompression, and determine the surgical strategy; (c) Early diagnosis of delayed intracranial hematoma, as an early warning; (d) Guide clinical treatment, such as the application of dehydration drugs, the time course of mild hypothermia treatment; and (e) Determine the surgical effect of bone flap surgery. A series of typical clinical studies are shown in Table 1, which shows the application value of ICP monitoring in traumatic brain injury.

Table 1
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Table 1. Clinical trial of useful value of ICP monitoring in patients with traumatic brain injury.

The current state of ICP monitoring technology and the future direction

The conventional ICP monitoring technique involves the direct implantation of a pressure sensor within the brain, subsequently connecting the pressure monitoring device to the exterior. This approach boasts the benefits of straightforward operation and precise pressure measurement (52). In contemporary medical practice, two prominent technologies, namely External Ventricular Drains (EVD) and Intraparenchymal Fiberoptic Monitors (IPM), stand as the preferred and recommended technology for intracranial pressure monitoring (53). At the same time, EVD can also drain cerebrospinal fluid to achieve the therapeutic purpose of reducing intracranial pressure (54). EVD is considered the gold standard. The conventional techniques employed for the monitoring of ICP are invasive in nature, which can potentially result in a series of complication. These include, but are not limited to, intracranial infections, intracranial hematomas, and damage to brain tissues (5558). In addition, the utilization rate of ICP monitoring technology in low-and middle-income nations remains exceptionally low. This may be attributed to the technical intricacies of ICP monitoring, as well as its prohibitively high cost (59). The optimal ICP monitoring device should exhibit precision, dependability, and cost-effectiveness, while concurrently imposing minimal morbidity (60). Therefore, the establishment of a non-invasive and simple bedside ICP monitoring method is of great value for trauma first aid. Prior research has revealed a positive correlation between changes in the optic nerve sheath diameter (ONSD) and ICP (61). However, it is worth noting that measurements of ONSD may encounter interference from the presence of papilledema (62). The Erasmus Medical Center in the Netherlands conducted clinical trials aimed at dynamically tracking alterations in ICP and analyzing whether such changes directly influence the measured value of ONSD. They discovered that the utilization of ultrasound measurement for ONSD in individuals suffering from TBI serves as a swift, straightforward, and efficacious approach (63). Accurate ICP non-invasive monitoring method, with ONSD≥5.0 mm as the critical value, accurately judge the increase of ICP (>20 mmHg) (64). This technology can be used in injured sites, emergency rooms and other places where invasive ICP monitoring cannot be implemented. In addition, compared with other literature reports using CT to measure the diameter of the optic nerve sheath, the ultrasonic measurement method can reflect ICP more simply and in real time, and is practical for clinical use (65). An observational study confirmed that the combination of ONSD and estimated ICP (eICP) using transcranial Doppler may improve the accuracy of estimating the occurrence of intracranial hypertension (66).

In fact, non-invasive ICP monitoring encompasses a diverse array of categories, which are outlined as follows: (1) imaging magnetic resonance, tomography, ONSD and other technologies; (2) indirect transmission of ICP, such as TCD and eyeball and ophthalmic artery methods; (3) monitoring metabolic changes, Such as near-infrared spectroscopy; and (4) the registration of functional activities, such as EEG, visual evoked potentials and auditory potentials (67). Theoretically speaking, the concept of a non-invasive technique for measuring intracranial pressure holds significant appeal, primarily due to its reduced tedious action and can avoid circumvent complications like hemorrhage and infection (68). The utmost priority thing is that the price is not too high. In the future, we aspire to conduct randomized clinical trials to substantiate the clinical impact of utilizing non-invasive techniques for intracranial pressure measurement.

How to manage the elevated intracranial pressure

The role of decompressive craniectomy in patients with TBI

Decompressive craniectomy (DC) is a neurosurgical intervention in which a part of the skull is removed to mitigate the pathological escalation of ICP, avert the occurrence of cerebral herniation, and prevent the onset of cerebral tissue ischemia (69). This surgery procedure holds the potential to improve cerebral hemodynamics and oxygenation in patients suffering from elevated ICP (70, 71). Furthermore, in certain instances, it can contribute to the reduction of mortality rates and disabilities among those afflicted with TBI (56). In patients with worsening cerebral edema, it effectively provides extra space for the swollen brain and reduces the risk of further elevation of ICP and brain herniation (57). The basic principle of DC is to remove a part of the skull, transforming the originally closed cranial cavity into a relatively open state, thereby changing the fixed capacity and limited ICP of the cranial cavity (72). Ever since the early 2000s, there has been a concerted effort not only to improve the pre-hospital care for TBI patients but also introduce well-designed programs and implement ICP monitoring. These advancements have collectively transformed the therapeutic environment of DC. The basic principle of decompression surgery is based on the Monro-Kellie law (59). According to this theory, the intracranial volume should be kept constant, and the volume should be compensated by the transfer of cerebrospinal fluid, cerebral blood volume or brain herniation. Removing a variable amount of bone, whether it involves enhancing the openness of the dura mater or augmenting the number through duraplasty, serves as a rapid and efficient approach to expand intracranial volume, thereby effectively reducing intracranial pressure and enhancing intracranial space (73). In recent years, the significant difference in the use of DCs globally has been the practice gap between low - and middle-income countries and high-income countries, which constitutes an important background for clinical decision-making (74). The application of DC surgery in high-income countries is supported by high-quality randomized controlled trials (RCTs) evidence. For example, the study on Neurosurgery at the University of Manitoba in Canada (75) integrated multiple clinical trial results, providing updated guidelines for the application of DCs in sTBI. These studies indicate that timely DC surgery can significantly reduce mortality in patients with refractory intracranial hypertension. High income countries rely on advanced medical technology and comprehensive postoperative management to ensure the safety and effectiveness of DC surgery (76). In contrast, low-income countries face many challenges in the application of DC surgery due to limited medical resources. These countries often lack advanced intracranial pressure monitoring equipment and appropriate nursing techniques, which limits the application of DC surgery (77). However, in emergency situations such as acute traumatic brain injury, DC surgery is still considered an important means of saving lives (78). However, inadequate postoperative management and rehabilitation support may affect the long-term prognosis of patients. Therefore, when formulating a global strategy for DC surgery, it is necessary to fully consider the economic, medical, and social conditions of different countries.

TBI management: optimal strategy for ICP monitoring

Determining the optimal timing for DC necessitates clinicians to possess a more comprehensive understanding of the ICP situation. This requires a complete ICP management plan. Given the significant individual differences among patients suffering from craniocerebral trauma, relying solely on a singular ICP indicator is evidently inadequate as a means to accurately assess prognosis.

Comprehensively, the value of ICP monitoring lies in real-time reflection of dynamic changes in intracranial pressure, providing key information for clinical diagnosis and treatment decision-making, and improving patient prognosis (79). A recent study has revealed that the score derived from head CT scans and the volume of brain contusion exhibit a correlation with the elevation of ICP (80). Consequently, these influencing characteristics can be harnessed to anticipate the risk of increased ICP in patients with sTBI and corresponding treatment (66). The combination of clinical and head CT examination results that can be used to make management decisions may be an effective strategy, which is also one of the directions of future clinical research. The Glasgow Coma Scale (GCS) provides a convenient method for quickly assessing the level of consciousness of TBI patients (67), but the GCS score alone cannot provide enough information to guide surgical decision-making. Therefore, elucidating the surgical requisites of patients should be combined with this information. Hence, we stress the importance of a comprehensive evaluation of ICP monitoring, head CT findings, and GCS scores for surgical decision-making to ensure a more reliable approach, particularly in specific scenarios. However, in high-income countries, despite the relatively abundant technological resources, the limited availability of technological resources and the significant differences in decision-making between high-tech medical services still exist (81). ICP monitoring, as the “gold standard” that directly reflects changes in intracranial pressure, is limited in its widespread application in all cases due to its high cost and operational complexity (82). In contrast, CT scanning has become the preferred method for preliminary assessment of traumatic brain injury due to its wide availability and relatively low cost (83). However, CT scanning has limitations in dynamically monitoring changes in intracranial pressure, and continuous observation of GCS scores has become an important supplementary tool to help doctors assess patients’ consciousness status and degree of neurological damage (84). Therefore, in the decision-making process, it is necessary to comprehensively consider the patient’s specific condition, treatment goals, resource cost-effectiveness, and potential risks in order to make the optimal treatment choice.

Conclusion and future directions

ICP monitoring combined with clinical manifestations and head CT imaging results can comprehensively evaluate the patient’s condition. We emphasize the importance of comprehensive evaluation of ICP monitoring, head CT results, and GCS scores for decision-making on whether to perform surgery, providing guidance to clinical doctors based on specific indications to ensure personalized and optimized treatment.

Author contributions

DZ: Writing – original draft, Visualization, Validation, Software, Resources, Methodology, Investigation, Formal analysis, Data curation, Conceptualization. YS: Writing – original draft, Visualization, Software, Resources, Methodology, Investigation, Formal analysis, Data curation, Conceptualization. CW: Writing – original draft, Visualization, Software, Resources, Investigation, Data curation, Conceptualization. WC: Writing – original draft, Software, Methodology, Investigation, Formal analysis, Data curation, Conceptualization. XS: Writing – review & editing, Visualization, Validation, Supervision, Software, Resources, Project administration, Methodology, Investigation, Formal analysis, Data curation, Conceptualization.

Funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Special Fund for Economic and Technological Development in Longgang District, Shenzhen (Grant no. LGKCYLWS2021000005).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: traumatic brain injury, intracranial pressure, decompressive craniectomy, TBI management, Glasgow Coma Scale

Citation: Zhang D, Sheng Y, Wang C, Chen W and Shi X (2024) Global traumatic brain injury intracranial pressure: from monitoring to surgical decision. Front. Neurol. 15:1423329. doi: 10.3389/fneur.2024.1423329

Received: 25 April 2024; Accepted: 02 September 2024;
Published: 17 September 2024.

Edited by:

Andrew P. Lavender, Federation University Australia, Australia

Reviewed by:

Jacek Szczygielski, University of Rzeszow, Poland
Rashad Hussain, University of Rochester Medical Center, United States

Copyright © 2024 Zhang, Sheng, Wang, Chen and Shi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Xiaofeng Shi, sxffxh@163.com

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.