Systemic Lupus Erythematosus (SLE) is a chronic autoimmune disease in which the immune system attacks the body’s own tissues and organs. It can affect the skin, joints, kidneys, heart, lungs, blood vessels, as well as the central and peripheral nervous systems. When lupus is associated with neurological or psychiatric manifestations, the term Neuropsychiatric Systemic Lupus Erythematosus (NPSLE) is often used. These manifestations can vary considerably. They may range from cognitive and psychiatric disturbances to seizures, strokes, and peripheral nerve damage. Careful evaluation is particularly important because a neurological symptom in a patient with Systemic Lupus Erythematosus is not necessarily caused directly by lupus itself.
Neurological Symptoms in Systemic Lupus Erythematosus
The neurological complications of lupus can affect different parts of the nervous system and may present differently from one patient to another.
Possible manifestations include:
- Seizures
- Cognitive impairment
- Memory and concentration difficulties
- Acute confusion
- Stroke
- Movement disorders
- Peripheral neuropathy
- Cranial neuropathies
- Less commonly, spinal cord involvement
- Mood disorders
- Psychotic symptoms in some patients
The appearance of new neurological symptoms in a person with known or suspected Systemic Lupus Erythematosus requires careful assessment in order to determine the underlying cause.
Cognitive Impairment and “Lupus Fog”
Some patients with Systemic Lupus Erythematosus (SLE) report difficulties with memory, concentration, attention, or information-processing speed. These symptoms are sometimes described as “lupus fog.” Cognitive dysfunction may be mild or more pronounced and does not necessarily indicate the presence of progressive dementia. At the same time, fatigue, sleep disturbances, chronic pain, depression, anxiety, and certain medications may also affect cognitive function. For this reason, a comprehensive assessment is required rather than automatically attributing such symptoms to lupus.
Seizures and Systemic Lupus Erythematosus
Seizures are a recognized neurological manifestation of Systemic Lupus Erythematosus. They may occur in association with active inflammatory involvement of the central nervous system, vascular lesions, metabolic disturbances, or other contributing factors. When a patient with SLE experiences a first seizure, investigation of the underlying cause is necessary. Depending on the clinical presentation, this may include Brain Magnetic Resonance Imaging (MRI), Electroencephalography (EEG), laboratory investigations, and other specialized tests.
Stroke and Lupus
Systemic Lupus Erythematosus may be associated with an increased risk of stroke, particularly in patients with specific vascular or thrombotic risk factors. Particular attention should be given to the possible coexistence of Antiphospholipid Syndrome (APS), which can increase the risk of blood clot formation and ischemic events.
Traditional vascular risk factors should also be assessed, including:
- High blood pressure
- Diabetes mellitus
- Hyperlipidemia
- Smoking
- Obesity
- Other cardiovascular conditions
The sudden onset of weakness, speech disturbance, facial asymmetry, visual disturbance, or other focal neurological symptoms is a medical emergency.
Peripheral Neuropathy and Systemic Lupus Erythematosus
Systemic Lupus Erythematosus can also affect the peripheral nervous system.
Peripheral neuropathy may cause:
- Numbness
- Tingling
- Burning sensations
- Neuropathic pain
- Reduced sensation
- Muscle weakness
Depending on the type of nerve involvement, a single nerve, multiple individual nerves, or a more generalized polyneuropathy may be affected. In some cases, electromyography and nerve conduction studies (EMG/NCS) may be required to assess the function of the peripheral nerves and muscles.
Psychiatric Manifestations of Systemic Lupus Erythematosus
Systemic Lupus Erythematosus may be associated with neuropsychiatric symptoms, including mood changes, anxiety, acute confusion, and, more rarely, psychotic symptoms. However, the presence of depression, anxiety, or other psychiatric symptoms in a patient with lupus does not necessarily indicate direct involvement of the brain by the disease. Chronic illness, pain, fatigue, sleep disturbances, medication effects, and other psychological or medical factors should also be considered during the assessment.
Diagnosis of the Neurological Complications of Systemic Lupus Erythematosus
The diagnosis of neurological complications of Systemic Lupus Erythematosus can be complex because there is no single test that can confirm that a neurological symptom is directly caused by Systemic Lupus Erythematosus (SLE).
The diagnostic workup is individualized according to the patient’s symptoms and may include:
Neurological examination: Muscle strength, sensation, reflexes, coordination, walking, cranial nerve function, and cognitive abilities are assessed.
Magnetic Resonance Imaging of the Brain or Spinal Cord (MRI): MRI may be used to identify vascular, inflammatory, or other neurological lesions.
Electroencephalography (EEG): EEG is mainly used when seizures or episodes suggestive of epileptic activity are present.
Electromyography and Nerve Conduction Studies (EMG/NCS): These tests may help investigate peripheral neuropathy or other neuromuscular disorders.
Cerebrospinal fluid analysis: In selected cases, a lumbar puncture may be performed to investigate inflammation, infection, or other possible causes.
Blood and immunological tests: These may be used to evaluate SLE activity, possible metabolic causes, and conditions such as Antiphospholipid Syndrome. In patients with cognitive symptoms, cognitive or neuropsychological assessment may also be performed.
Treatment of the Neurological Complications of Systemic Lupus Erythematosus
The treatment of neurological complications of lupus depends on the underlying cause and the type of neurological manifestation. When there is strong evidence that symptoms are related to active inflammatory or immune-mediated Systemic Lupus Erythematosus (SLE), immunosuppressive or immunomodulatory treatment may be required. The choice of therapy depends on the severity and type of neurological involvement.
In other cases, treatment focuses on the specific mechanism or symptom and may include:
- Anti-seizure medication for seizures
- Treatment of neuropathic pain
- Treatment of depression, anxiety, or other psychiatric symptoms
- Antithrombotic or anticoagulant therapy when specifically indicated
- Management of vascular risk factors
- Physiotherapy and rehabilitation when motor difficulties are present
- Cognitive rehabilitation in selected patients
Treatment often requires collaboration between a Neurologist, Rheumatologist, and other medical specialists depending on the clinical manifestations.
Neurological Follow-Up in Systemic Lupus Erythematosus
Regular follow-up is particularly important in patients with SLE who have experienced neurological complications. The aim is to monitor the progression of symptoms, identify new neurological manifestations at an early stage, assess the response to treatment, and prevent possible complications. The appearance of a new seizure, sudden weakness or numbness, speech or visual disturbance, severe confusion, loss of consciousness, or any other acute neurological symptom requires immediate medical assessment. Early recognition of the neurological complications of Systemic Lupus Erythematosus, appropriate investigation of the underlying cause, and individualized treatment can contribute to better symptom control, prevention of permanent neurological damage, and preservation of functional ability and quality of life.