Preexisting Mental Disorders Increase Mortality After Spinal Injury

The Hidden Mortality Drivers in Spinal Trauma

Traumatic spinal injury remains a leading cause of global disability and premature death, often resulting in complex clinical trajectories that extend far beyond the initial neurological deficit [1]. While acute management focuses on stabilization and preventing secondary deterioration, long-term outcomes are frequently compromised by complications such as pressure sores, infections, and persistent motor deficits [2, 3]. Risk stratification in these patients typically relies on physical markers, such as the modified frailty index (a tool used to measure physiological reserve and vulnerability to stressors), to predict in-hospital mortality and discharge destination [4]. However, the intersection of physical trauma and psychiatric health remains a critical yet under-examined variable in survival models [5]. A recent population-based study examines how preexisting psychiatric conditions influence mortality rates following these injuries, providing clinicians with new data to identify highly vulnerable patients who may require intensive, multidisciplinary follow-up.

Mapping Psychiatric Comorbidity in Acute Injury

To investigate the intersection of psychiatric health and physical trauma, researchers conducted a population-based retrospective cohort study using comprehensive hospital records from New South Wales, Australia. The study identified individuals with acute traumatic spinal injury through hospital records and established a robust data linkage by integrating ambulance and emergency department records from June 1, 2013, to June 30, 2016. To track long-term outcomes, the researchers linked these clinical files with death records spanning from June 1, 2013, until December 31, 2018. This longitudinal approach allowed for a precise calculation of all-cause and cause-specific mortality rates across different psychiatric profiles.

The analysis revealed that one-third of people with traumatic spinal injury have a preexisting mental disorder, highlighting a highly prevalent comorbidity that complicates post-injury care and necessitates routine psychiatric screening in trauma bays. The researchers categorized these patients into three distinct groups to better understand the impact of specific psychiatric histories. Within the cohort, 23% of the patients had mental illness only, while 6% of the cohort had substance use disorder only. Furthermore, 5% of the cohort had a dual diagnosis of mental illness and substance use disorder. By stratifying the data this way, the findings provide a granular view of how different types of preexisting psychiatric conditions influence survival trajectories following a spinal cord or column injury.

Quantifying the Survival Gap

The researchers established a baseline for the study population by determining that the crude mortality rate for the cohort was 84.1 (95% CI 81.8 to 86.5) deaths per 1,000 person-years. To provide a more nuanced understanding of how these deaths compared to the broader community, the researchers calculated all-cause and cause-specific crude mortality rates alongside age-adjusted and sex-adjusted standardized mortality ratios. A standardized mortality ratio is a statistical measure that compares the observed number of deaths in a specific study group to the number of deaths that would be expected in the general population. To model the association between preexisting mental disorders and mortality, the study utilized flexible parametric survival models stratified by age (16 to 64 and 65 years or older), a method that allows for the analysis of risk over time while accounting for the non-linear effects of aging.

The analysis revealed that standardized mortality ratios ranged from 4 to 17 in people with mental disorders after injury compared to the general population. This elevation in risk was most acute among younger patients. In the younger age stratum, which included individuals between 16 and 64 years of age, those with a dual diagnosis of mental illness and substance use disorder had a standardized mortality ratio of 17.6 (95% CI 14.1 to 21.9). This represents a nearly 18-fold increase in the risk of death compared to age-matched individuals in the general population. Other psychiatric categories also demonstrated significantly higher mortality risks within the 16 to 64 year age group. Patients with substance use disorder only had a standardized mortality ratio of 9.2 (95% CI 7.3 to 11.7), while those with mental illness only had a standardized mortality ratio of 4.4 (95% CI 3.3 to 5.8). These data points indicate that while any preexisting psychiatric condition increases the likelihood of premature death following spinal trauma, the presence of substance use disorder creates a profound survival disadvantage for younger patients during the post-injury period.

Age-Specific Risks and Protective Factors

The survival trajectory following traumatic spinal injury is heavily influenced by the patient's age at the time of injury and the specific nature of their psychiatric history. The researchers found that preexisting mental disorders predict increased mortality risk after traumatic spinal injury, particularly for individuals aged 16 to 64 years. When comparing patients with spinal injuries to those without any mental health history, nearly all psychiatric subgroups faced a higher risk of death. However, a notable exception occurred in the younger age stratum, where the mental illness only group did not show an increased risk of mortality compared to those without a mental disorder. This suggests that in younger cohorts, the presence of a substance use disorder is a more potent driver of post-injury mortality than a non-substance-related mental health diagnosis alone.

The cause of death also varied significantly based on the patient's psychiatric profile. For patients with a history of substance use disorder, external cause mortality (deaths resulting from accidents, intentional self-harm, or assault) was markedly elevated. This finding underscores the vulnerability of this population to non-natural causes of death during the recovery phase, signaling to clinicians that discharge planning must include robust safety assessments. Conversely, the study identified systemic factors that may mitigate these risks. The data indicated that health insurance is protective against mortality after traumatic spinal injury, likely by facilitating more consistent access to specialized follow-up care, prescription medications, and rehabilitation services. Given these disparities, the authors conclude that increased integration with mental healthcare and addiction medicine is critical for reducing health inequities and improving long-term survival for patients managing preexisting psychiatric disorders after a traumatic spinal injury.

References

1. Feigin VL, Nichols E, Alam S, et al. Global, regional, and national burden of neurological disorders, 1990–2016: a systematic analysis for the Global Burden of Disease Study 2016. The Lancet Neurology. 2019. doi:10.1016/s1474-4422(18)30499-x

2. Ukachukwu AK, Nischal SA, Trillo-Ordonez Y, et al. Epidemiological Burden of Neurotrauma in Nigeria: A Systematic Review and Pooled Analysis of 45,763 Patients.. World neurosurgery. 2024. doi:10.1016/j.wneu.2023.11.070

3. Darko K, Shukla I, Hassan T, et al. Presentation, management, and outcome of traumatic spine injuries in Africa: a systematic review and meta-analysis.. Journal of neurosurgery. Spine. 2025. doi:10.3171/2024.8.SPINE24614

4. Rohollahi F, Farahbakhsh F, Kankam SB, et al. Role of Frailty Status in Prediction of Clinical Outcomes of Traumatic Spinal Injury: A Systematic Review and Meta-Analysis.. Journal of neurotrauma. 2023. doi:10.1089/neu.2023.0008

5. Posadzki P, Pieper D, Bajpai R, et al. Exercise/physical activity and health outcomes: an overview of Cochrane systematic reviews. BMC Public Health. 2020. doi:10.1186/s12889-020-09855-3