Limitations of the Glasgow Coma Scale: Challenges and Considerations.

Traumatic brain injury (TBI) is a prominent cause of long-term disability and death in the United States. The Glasgow Coma Scale (GCS) plays a crucial role in managing TBI by providing a standardized method for assessing severity, monitoring progression, guiding treatment decisions, predicting outcomes, facilitating communication, and supporting research and quality improvement efforts. The scale offers a practical approach to assessing the impairment of consciousness in response to specific stimuli. However, to date, there is a paucity of literature discussing the limitations of the GCS. In this narrative review, we have analyzed seven studies published between 2009 and 2024 in hopes of highlighting some of the limitations, such as potential subjectivity in scoring, inability to assess certain brainstem reflexes, and the need for supplementary assessments for specific neurological conditions. After reviewing literature from the past 15 years, several limitations of the GCS become apparent, including its failure to incorporate brainstem reflexes with limitations arising due to sedation and intubation of the patient. Moreover, the GCS consists of three sub-scales that are summed and assumed to carry equal weight. This can result in a loss of information as it is possible to achieve identical GCS scores through various combinations. Awareness of the limitations of the GCS can be crucial for clinicians when making decisions in specific scenarios, while also encouraging consideration of potential improvements to the scale.