Neuropsychiatric Symptoms and CSF Markers Predict General Paresis Outcomes

The Great Imitator in the Modern Memory Clinic

General paresis, a tertiary manifestation of neurosyphilis, remains a critical diagnostic consideration for clinicians managing progressive cognitive decline and psychiatric syndromes [1]. While often overshadowed by more common neurodegenerative conditions, this infection-driven dementia frequently presents with a complex array of mental and behavioral disorders that can lead to initial misdiagnosis, such as being mistaken for alcohol-related disorders or parkinsonism [2]. Beyond the classic cognitive deficits, patients often exhibit a broad spectrum of neuropsychiatric symptoms, including mood disturbances and personality changes; notably, a recent study of 100 patients found a significant negative correlation between Neuropsychiatric Inventory total scores and Mini-Mental State Examination scores (r = -0.583, P < 0.001) [3]. Accurate differentiation from Alzheimer's disease or frontotemporal dementia is essential, as the underlying inflammatory and autoimmune responses in neurosyphilis, which may include the presence of autoimmune encephalitis antibodies in 11% of cases, require specific antimicrobial and supportive strategies [1, 4]. These findings emphasize that higher baseline neuropsychiatric symptom severity and lower educational attainment are independent risk factors for a poor prognosis, which was observed in 62% of patients at a 12-month follow-up [3].

Mapping the Neuropsychiatric and Cognitive Landscape

The clinical presentation of general paresis is characterized by a profound and near-universal intersection of behavioral and cognitive decline. Researchers conducted a retrospective analysis of clinical data from 100 patients diagnosed with general paresis who were admitted to clinical care between January 2022 and June 2024. To quantify the behavioral and cognitive burden of the disease, the study utilized the Neuropsychiatric Inventory (a clinical tool used to evaluate 12 behavioral domains in dementia) and the Mini-Mental State Examination (a 30-point screening tool for cognitive impairment). The results demonstrated that every patient in the cohort (100%) exhibited varying degrees of neuropsychiatric symptoms, underscoring the near-universal presence of behavioral disturbances in this population at the time of admission. This suggests that for the practicing physician, the absence of psychiatric symptoms should perhaps prompt a reconsideration of a neurosyphilis diagnosis.

The severity of these symptoms was substantial, with a mean Neuropsychiatric Inventory total score of 42.38 ± 29.96 points. When examining specific behavioral domains, the researchers found that depression (6.20 ± 3.83) and apathy (5.75 ± 3.78) were the highest-scoring neuropsychiatric symptoms, while aberrant motor behavior (0.62 ± 1.08) was the lowest-scoring symptom. These findings suggest that mood and motivation deficits are the primary psychiatric manifestations clinicians should expect when evaluating patients with neurosyphilis, rather than overt motor restlessness. Parallel to these behavioral findings, all 100 patients (100%) exhibited cognitive impairment, reflected by a mean Mini-Mental State Examination score of 13.78 ± 2.92. Within the cognitive domains assessed, impaired recall ability (0.94 ± 0.69) was identified as the most significant deficit, providing clinicians with a specific marker for the cognitive profile of general paresis. For the practicing physician, these baseline assessments provide a clear map of the clinical challenges; the profound deficit in recall ability, scoring less than one point on average, highlights a level of cognitive dysfunction that significantly impacts patient autonomy and the complexity of managing their long-term care.

Quantifying the Link Between Behavior and Cognition

The relationship between behavioral dysregulation and cognitive failure in general paresis is not merely coincidental but statistically coupled. The researchers utilized Spearman correlation analysis (a statistical method used to measure the strength and direction of the relationship between two ranked variables) to examine the interplay between behavioral disturbances and cognitive function. This analysis revealed a significant negative correlation between Neuropsychiatric Inventory total scores and Mini-Mental State Examination total scores (r = -0.583, P < 0.001). For the clinician, this inverse relationship indicates that as the severity of neuropsychiatric symptoms increases, cognitive performance tends to decline predictably. These findings suggest that the total burden of psychiatric symptoms may serve as a reliable clinical proxy for the underlying degree of cognitive impairment in patients with general paresis, allowing for a more holistic assessment of disease severity during a standard psychiatric intake.

This association was not limited to global scores but extended across the entire spectrum of behavioral manifestations, suggesting a widespread neurological insult. All Neuropsychiatric Inventory subscales showed significant negative correlations with Mini-Mental State Examination total scores (all P < 0.001), demonstrating that every measured behavioral domain tracks closely with cognitive deterioration. Specific clinical features were particularly indicative of cognitive status; for instance, the correlation between delusions and Mini-Mental State Examination scores was r = -0.573 (P < 0.001), while the correlation between appetite and eating changes and Mini-Mental State Examination scores was r = -0.556 (P < 0.001). These data points emphasize that even non-cognitive symptoms, such as changes in eating habits or the presence of fixed false beliefs, are statistically linked to the severity of the patient's dementia, providing physicians with multiple clinical indicators of disease progression that can be monitored over time.

Predictors of 12-Month Clinical Prognosis

Identifying patients at risk for poor long-term outcomes is essential for tailoring the intensity of follow-up care and family counseling. All 100 patients in the study received standardized anti-syphilis treatment and completed a 12-month follow-up period to assess long-term recovery. The researchers determined the clinical prognosis for each participant based on cerebrospinal fluid test results at the final 12-month follow-up, categorizing patients into good and poor outcome groups. At the conclusion of this period, 38 patients (38.00%) were found to have a good prognosis, while 62 patients (62.00%) were classified as having a poor prognosis, indicating that a majority of patients in this cohort did not achieve optimal laboratory resolution despite standard therapy. This high rate of poor prognosis underscores the need for early intervention before irreversible neurological damage occurs.

To identify which baseline characteristics could predict these outcomes, the authors utilized multivariate logistic regression (a statistical method used to determine the independent effect of multiple variables on a single outcome). This analysis identified four independent risk factors that significantly influenced the likelihood of a poor prognosis. Socioeconomic factors played a role, as lower educational attainment was an independent risk factor for poor prognosis (OR = 0.191, 95% CI: 0.052–0.709, P = 0.013). Furthermore, the inflammatory state at the time of diagnosis was highly predictive; an elevated baseline cerebrospinal fluid white blood cell count was an independent risk factor for poor prognosis (OR = 3.194, 95% CI: 1.628–6.268, P < 0.001), suggesting that more intense initial central nervous system inflammation correlates with more difficult-to-treat disease. Baseline clinical assessments also provided critical prognostic information; the severity of behavioral disturbances at intake was a primary indicator of future health, with higher Neuropsychiatric Inventory total scores serving as an independent risk factor for poor prognosis (OR = 1.073, 95% CI: 1.029–1.119, P < 0.001). Similarly, the degree of cognitive impairment at presentation was a major determinant of recovery, as lower Mini-Mental State Examination scores were an independent risk factor for poor prognosis (OR = 0.493, 95% CI: 0.338–0.720, P < 0.001). These findings emphasize that patients presenting with low education, high cerebrospinal fluid inflammatory markers, and severe neuropsychiatric or cognitive deficits are at the highest risk for poor outcomes, necessitating targeted interventions and closer clinical monitoring.

References

1. Wang R, Chen S, Fei C, et al. Clinical, radiological, pathological and prognostic features of general paresis: a cohort study.. 2025. doi:10.1093/brain/awae389

2. Shi Z, Sun Y, Han X. Unmasking the hidden culprit: neurosyphilis mimicking parkinsonism in a middle-aged male. BMC Neurology. 2025. doi:10.1186/s12883-025-04101-y

3. Meng T, He Y, Qin L, et al. Correlation analysis of psychiatric and behavioral symptoms with cognitive impairment and prognosis in patients with general paresis. Frontiers in Psychiatry. 2026. doi:10.3389/fpsyt.2026.1769770

4. Lathe R, Schultek NM, Balin BJ, et al. Establishment of a consensus protocol to explore the brain pathobiome in patients with mild cognitive impairment and Alzheimer's disease. Alzheimer s & Dementia. 2023. doi:10.1002/alz.13076