Guillain-Barré Syndrome Presents as Catatonic Stupor in Schizophrenia Case

The Diagnostic Challenge of the Silent Patient

Managing patients with schizophrenia requires constant vigilance for comorbid physical illnesses, as this population faces a significantly higher risk of infections and subsequent autoimmune complications [1, 2, 3]. A meta-analysis of eight cohort studies demonstrated that patients with autoimmune diseases of the nervous system have a 42% increased risk of developing schizophrenia (Relative Risk 1.42; 95% CI, 1.18-1.72), with a specific positive association noted for multiple sclerosis (Relative Risk 1.36; 95% CI, 1.12-1.66) [1]. While psychiatric symptoms often dominate the clinical picture, evidence suggests a complex interplay between systemic inflammation, immune dysregulation, and the pathogenesis of psychosis [4, 5]. For example, researchers have identified overlapping immune-related genes and inflammatory pathways, such as the mitogen-activated protein kinase (MAPK) and transforming growth factor beta (TGF-beta) signaling pathways, between patients with schizophrenia and those with severe viral infections [4]. When these patients present with acute immobility or mutism, clinicians frequently default to a diagnosis of catatonia, potentially overlooking underlying neurologic emergencies, such as encephalitis or stroke, that require immediate intervention [6]. A recent case study now illustrates the critical importance of maintaining a broad differential diagnosis when psychiatric presentations deviate from established patterns.

Clinical Progression and Initial Psychiatric Impression

The case involves a 28-year-old man with a 3-year history of schizophrenia, a severe psychiatric disorder characterized by chronic disturbances in thought, perception, and behavior. His clinical history was marked by a significant first episode that included hallucinations, persecutory delusions, and catatonia, a psychomotor syndrome featuring immobility and mutism. This initial presentation remitted successfully following the administration of antipsychotic medications. Over the subsequent years, the patient experienced two relapses involving hallucinations and delusions, though notably, these episodes occurred without catatonia. Both instances were managed with re-treatment, eventually leading to a stable period on regular risperidone maintenance therapy. The current clinical encounter began when the patient was admitted emergently after 2 weeks of lost contact. While the episode initially presented with a recurrence of hallucinations and delusions, his condition rapidly deteriorated. The symptoms progressed from apathy and reduced speech to complete mutism, immobility, and an inability to perform self-care. Given the patient's established history, clinicians initially diagnosed a psychiatric relapse according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria. Based on this assessment, the medical team initiated risperidone therapy, attributing the profound psychomotor retardation to catatonic stupor, a diagnosis supported by the patient's previous history of catatonic features during his first psychotic break. This initial diagnostic anchoring, which is the clinical tendency to rely heavily on a patient's known history to explain new symptoms, appeared consistent with the patient's psychiatric profile. Because schizophrenia patients are at an increased risk for infections, which can trigger both psychiatric exacerbations and neurologic complications, the presentation of total immobility in a patient with a known history of catatonia often leads to a primary psychiatric diagnosis. In this instance, the patient's complete mutism and inability to perform activities of daily living were viewed through the lens of his pre-existing severe psychiatric disorder, delaying the consideration of non-psychiatric etiologies for his paralysis.

Neurologic Red Flags and Laboratory Findings

Distinguishing between psychiatric and neurologic immobility requires a high index of suspicion, particularly because catatonia is relatively common in schizophrenia. This psychomotor syndrome manifests through clusters of symptoms such as catatonic stupor, mutism, and negativism, which can closely mimic the profound physical limitations of severe polyneuropathy. In this case, the diagnostic picture was complicated by the fact that patients with schizophrenia are at an increased risk of infections, which are recognized triggers for Guillain-Barré syndrome. While the patient's initial presentation of mutism and immobility was attributed to a psychiatric relapse, further clinical evaluation identified a pulmonary infection accompanied by limb weakness and decreased tendon reflexes. These findings provided a critical diagnostic pivot, as they differed significantly from the increased muscle tone and rigidity typically observed in catatonic states. The clinical presentation of Guillain-Barré syndrome typically involves limb weakness, paresthesia, facial weakness, respiratory muscle paralysis, and autonomic symptoms. These neurologic deficits can result in severe immobility and impaired communication, creating a symptomatic overlap with psychiatric stupor. The researchers noted that the coexistence of schizophrenia and Guillain-Barré syndrome significantly increases the risk of misdiagnosis or delayed diagnosis because history taking and clinical assessment are exceptionally challenging in patients who are already uncooperative or mute. To resolve the diagnostic uncertainty, the medical team performed a lumbar puncture to analyze the cerebrospinal fluid. The results confirmed albuminocytologic dissociation (a classic neurologic finding where protein levels are elevated despite a normal white blood cell count), which is highly suggestive of Guillain-Barré syndrome. Laboratory analysis of the patient's cerebrospinal fluid revealed a protein level of 0.61 g/L and a leukocyte count of 1.2×10^6/L, meeting the criteria for albuminocytologic dissociation. This objective evidence of an inflammatory demyelinating process allowed the clinical team to differentiate neurologic paralysis from psychiatric mutism. For the practicing clinician, this case highlights that when a patient with a history of schizophrenia presents with sudden immobility following an infection, the absence of typical catatonic posturing and the presence of diminished reflexes should prompt immediate neurologic investigation. Identifying these red flags is essential to prevent the potentially life-threatening consequences of untreated respiratory muscle paralysis or autonomic instability associated with progressing Guillain-Barré syndrome.

Management and Long-Term Clinical Outcomes

Upon confirming the diagnosis of Guillain-Barré syndrome, the medical team transferred the patient to the neurology department for targeted intervention. The researchers initiated a treatment regimen consisting of intravenous immunoglobulin at a dosage of 25 g/day for 5 days, supplemented by a structured rehabilitation program. This dual approach addressed the autoimmune-mediated demyelination while mitigating the physical deconditioning caused by prolonged immobility. The patient showed gradual clinical improvement following the completion of the immunoglobulin course. At the 1-year follow-up, the patient remained stable on a maintenance dose of risperidone 4 mg to prevent a recurrence of psychiatric symptoms. The authors reported that his symptoms had essentially resolved, allowing him to achieve a full functional recovery and return to his previous employment and daily activities. This case highlights a critical diagnostic pitfall in psychiatric practice, where mutism and immobility in patients with established psychiatric diagnoses are often incorrectly attributed to primary psychiatric illness. This phenomenon, sometimes referred to as diagnostic overshadowing, occurs when clinicians assume new physical symptoms are merely manifestations of a known mental health disorder. The researchers emphasize that a thorough neurologic examination and investigations such as lumbar puncture are critical in uncooperative patients, particularly when symptoms emerge following an antecedent infection. For the practicing clinician, the presence of diminished tendon reflexes should serve as a definitive signal to look beyond a psychiatric diagnosis. Timely neurologic screening and the use of objective diagnostic tools are essential to ensure that treatable, life-threatening conditions like Guillain-Barré syndrome are not overlooked in the context of chronic schizophrenia.

References

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