Von Economo’s disease and postencephalitic parkinsonism responsive to carbidopa and levodopa

Abstract

Postencephalitic parkinsonism (PEP) is currently perceived as having a very close etiologic relationship with encephalitis lethargica (von Economo’s disease [EL]), with PEP developing immediately after the acute phase of EL or at some time later. EL was classically described by von Economo and has somnolent-ophthalmoplegic, hyperkinetic, and amyostatic-akinetic forms. Previous cases have reported success with levodopa in PEP. We report a case with PEP showing success after administration of levodopa and carbidopa. This case would support the hypothesis that this syndrome effects dopamine neurotransmission.

Keywords:

• von Economo
• encephalitis lethargica
• postencephalitic parkinsonism
• carbidopa
• levodopa
• catatonia

Introduction

Encephalitis lethargica (von Economo’s disease, sleeping disease; EL) occurred in epidemic proportions between 1916 and 1929. The clinical manifestations were described in detail by the Austrian physician von Economo who described the atypical encephalitis that predominantly affected the basal ganglia resulting in movement, psychiatric, and sleep disorders.⁴ Parkinsonism was the classic movement disorder, but hyperkinetic movements were often concurrent.² Psychiatric disorders were common, and EL has shown similarities with catatonia.⁴ There have been a number of contemporary reports of EL in the recent decades and diagnostic criteria have been proposed.^2,3 Contemporary postencephalitic parkinsonism (PEP) is related to a postencephalitic state in which there is subsequent degeneration of the basal ganglia leading to clinical parkinsonism.⁴ While the etiology remains uncertain, modern reviews have EL associated with PEP due to post-infectious and/or autoimmune phenomenology.¹ We report a case that showed movement disturbance, psychiatric, and sleep disturbance. In addition, we describe the improvement of symptoms once levodopa and carbidopa are initiated, recurrence of symptoms when withheld, and resolution of symptoms with re-administration of levodopa and carbidopa.

Case

A 66-year-old Caucasian male was admitted to the hospital for altered mental status. The patient has been a resident at a psychiatric facility for bipolar disorder.

The patient’s history was obtained by a Geriatric Psychiatrist at the Psychiatric facility who has been following the patient, Baseline mental state and function is reported as ambulatory. The patient interacts with fellow residents and speaks appropriately with linear process. The patient is not noted to have any tremors or movement disturbances. Gait is recalled as steady. According to the reports, the patient was on olanzapine 5 mg nightly for a few months, which was discontinued due to drowsiness 8 weeks prior to admission. The patient has remained on standing valproic acid extended release tablet 1,000 mg at bedtime and clonazepam 0.25 mg PO BID for anxiety and irritability.

Five days prior to admission, the patient was noted to be febrile; the patient remained bedridden with continuous sleep, fixed stare and movement similar to oculogyric crisis, and intermittent rigidity. Valproic acid was held and the patient was started on lorazepam q8h for 3 days for suspected catatonic features. However, the patient’s condition worsened. The patient was then recommended escalation of care and presented to the hospital and admitted to the medical service.

Once admitted, the patient was medically worked up by the critical care team and found to have a blood pressure of 100 s/70 s, heart rate of 110 s, and oxygen saturation of 99%–100% on 2 L nasal cannula. The patient remained unresponsive rigid presentation, and disoriented. Intravenous cefepime, vancomycin, and metronidazole were initiated. Head CT without contrast reported no bleed or acute findings and noted incidental arachnoid cyst.

Psychiatrist was consulted to evaluate for altered mental status with concern for catatonic features and to rule out neuroleptic malignant syndrome or serotonin syndrome. On examination, the patient appeared ill, with no obvious lesions, head without any tenderness or deformities, pupils equally round and reactive to light and accommodation, fixed stare, poor dentition, no oropharyngeal erythema or injection, S1 S2 audible without murmur, chest clear to auscultation without wheeze rhonchi or rales, abdomen soft non-tender and non-distended, palpable pulses throughout without any edema. The patient appeared alert, responded to voice, with incomprehensible sounds, moves all extremities spontaneously, visible mild resting tremor to distal extremities, with reflexes intact, and found to be hypertonic throughout all 4 extremities. Due to the patient’s fever, autonomic instability, rigid appearance, and chronic psychiatric disorder, acute catatonia was suspected with etiology uncertain. The patient was recommended to start lorazepam 2 mg IV every 8 hours.

By day 3, the patient’s condition remained the same with minimal improvement in bradykinesia, rigidity, and fixed stare. A resting tremor and decreased glabellar reflex were noted. The patient’s home dose of valproic acid was re-initiated. The neurology team was consulted for further evaluation of mental status changes and the team recommended a lumbar puncture and MRI of the brain. Due to suspicion of dental infection, the oral and maxillofacial team was consulted and excision of the carious non-restorable teeth was performed on day 4. Operative report mentions no obvious abscess, fluid collection, or gross infection. The patient tolerated anesthesia, and the perioperative period was without notable oral or maxillofacial complications. The patient’s presentation on days 5–7 remained the same and lorazepam was titrated down and discontinued. In addition, the patient failed a swallow study and a nasogastric tube was placed for nutritional tube feeds.

On day 7, an EEG was performed, which reported “an abnormal EEG due to generalized background slowing. Generalized background slowing may be due to toxic/metabolic/infectious state, or alternatively due to medication effect. No seizures recorded. Clinical correlation is recommended.” Blood cultures, urine culture, and preliminary lumbar puncture cultures reported no growth. Broad-spectrum antibiotics were discontinued. A trial of carbidopa and levodopa 25/100 mg every 8 hours was initiated. A review of comprehensive laboratory and diagnostic testing is resulted in Box 1. Axial and sagittal plane of brain MRI is displayed in Figure 1.

Figure 1 MRI of the brain with contrast.

Notes: (A) T2WI axial view. (B) T1WI sagittal view. Both views demonstrate nonspecific dural enhancement.
Abbreviations: MRI, magnetic resonance imaging; T1WI, T1-weighted image; T2WI, T2-weighted image.

Box 1 Laboratory results and diagnostics

Arterial blood gas pH 7.42, PCO2 38 mm[Hg], PO2 119 mm[Hg], HCO3 24 mmol/L

WBC 15.74 10*3/µL, RBC 3.58 10*6/µL, hemoglobin 10.7 g/dL, hematocrit 34.6%, MCV 96.6 fL, MCH 29.9 pg, RDW 13.3%, PLT

249 10*3/µL, neutrophils 13.69 10*3/µL, lymphocytes 1.10 10*3/µL, monocytes 0.82 10*3/µL, eosinophils 0 10*3/µL, basophils 0.14 10*3/µL

Glucose 120 mg/dL, BUN 36 mg/dL, creatinine 1.44 mg/dL, sodium

144 mmol/L, potassium 4.2 mmol/L, chloride 108 mmol/L, CO2

22 mmol/L, calcium 8.6 mg/dL, albumin 2.8 g/dL, phosphorus

2.6 mg/dL, magnesium 1.9 mg/dL

AST 31 U/L, ALT 23 U/L, ALP 63, bilirubin total 0.5 mg/dL, bilirubin direct <0.2 mg/dL, protein 6.4 g/dL

Lactate 0.7 mmol/L, CPK 278 U/L

INR 2.1, PT 24.0 s, PTT 26.3 s

Valproic acid, total 8.2 µg/mL

TSH 1.05 µ[IU]/mL

Folate 16.1 ng/mL, vitamin B12 1,174 pg/mL

Urinalysis color yellow, cloudy, specific gravity 1.025, pH 5.5, protein 1+, Glu negative, ketones negative, bilirubin negative, blood 1+, leukocyte esterase 3+, urobilinogen negative, nitrite negative, WBC >180, RBC 10, squamous epithelial <1, Mucus 1+

Urine culture no growth

CSF appearance clear and colorless, protein 39, corrected nucleated cells 3 uL, RBC 869 uL, granulocyte 60%, lymphocyte 30%, monocyte 10%, eosinophils 0%, albumin 19.2%, herpes 1 and 2 not detected, IGG/ALB 0.22, CSF VDRL nonreactive, glucose 71, IGG 4.3

CSF smear few polys no organisms

CSF culture no growth

Blood culture no growth

Urine culture no growth

Nasal MRSA not detected

CXR no acute cardiopulmonary disease

Abbreviations: WBC, white blood cell; RBC, red blood cell; MCV, mean corpuscular volume; MCH, mean corpuscular hemoglobin; RDW, red blood cell distribution width; PLT, platelet; BUN, blood urea nitrogen; AST, aspartate aminotransferase; ALT, alanine aminotransferase; ALP, alkaline phosphatase; CPK, creatine phosphokinase; INR, international normalized ratio; PT, prothrombin time; PTT, partial thromboplastin time; TSH, thyroid stimulating hormone; CSF, cerebral spinal fluid; IGG/ALB, immunoglobulin G / albumen; CSF VDRL, cerebral spinal fluid venereal disease research laboratory test; MRSA, methicillin resistant staph aureus; CXR, chest x-ray (radiograph).

On days 8–10, the primary team members and psychiatry team were in agreement of clinical improvement; the patient was able to wiggle toes on command, with less rigidity and cessation of tremor, and able to track eyes with personnel. On day 10, the carbidopa and levodopa dose was increased to 25/250 mg every 8 hours.

On day 14, family members reported dramatic improvement in mental status with recognition of family members, relying to name, responding with one-word answers. Lower extremities were no longer rigid. Upper extremities were with some resistance. Speech pathology noted improvement in swallow function and recommended gentle diet initiation.

On day 16, a comprehensive discussion was done with the primary medical, neurology, and psychiatry teams with the family; due to the patient’s atypical presentation and potential activating properties of carbidopa and levodopa, a trial to discontinue carbidopa and levodopa was entertained to truly consider a postencephalitic parkinsonian state. This was agreed with all clinicians and family members were in agreement.

During days 16–21, the patient was weaned off the carbidopa and levodopa initially by reduction in dose from 25/250 to 25/100 mg every 8–12 hours and then discontinued. The patient’s appearance worsened with notable recurrence of fixed stare, mutism, and rigidity.

On day 21, the patient failed speech therapy’s swallow trail and it was recommended that they have nothing by mouth. Due to these worsening clinical features and concern for swallow and airway compromise, carbidopa and levodopa were re-initiated.

On day 23, the patient had a dramatic improvement to clinical presentation; resolution of rigidity, tracking eyes, increased words when conversing, and sleep cycle were restored. The patient was oriented to self, place, and year. No tremor to the extremities or obvious bradykinesia was noted. The patient started to ambulate out of bed with assistance. In addition, the patient passed the speech therapy swallow study, began to tolerate meals, and self-fed with meal trays. The patient was discharged on day 25 and was transferred back to a rehabilitation and skilled nursing facility.

Ninety-day follow up is notable for continued administration of carbidopa and levodopa 25/200 mg controlled release tablet orally twice daily. The patient and family report that the patient is back to baseline function and residing at a long-term care psychiatric facility.

Ethics

The authors obtained written informed consent from the patient to have case details and accompanying images published.

Discussion

The case reported identifies a patient with a chronic psychiatric disorder and new onset persistent fever without an obvious source, and presents with unretractable catatonic features, which evolved to a parkinsonism-like presentation that clinically responded to carbidopa and levodopa administration. Catatonia is marked by heterogeneous signs that are observed or elicited; most common are immobility, stupor, negativism, staring, and echolalia.^5,6 The subtypes are based on the specific nature of movement disturbance and other associated features: retarded – mutism, inhibited movement, posturing, rigidity, negativism, and starting; malignant – fever, autonomic instability, delirium, and rigidity; excited – excessive and purposeless motor activity, restlessness, stereotypy, impulsivity, frenzy, agitation, and combativeness.⁵ Benzodiazepines and then electroconvulsive therapy (ECT) are considered as the first line treatment of choice in suspected catatonia.⁶ In cases with poor response, there have been reports describing other treatments such as valproate,⁷ zolpidem,⁸ memantine,⁹ and bromocriptine.¹⁰

While this patient presented with features similar to malignant catatonia, the patient failed a trial of lorazepam prior to hospital admission as well as a 5-day trial once admitted. This brought into question of resolving any underlying illness or alternate etiologies, especially, since 60%–80% of reported catatonia cases respond to full remission with benzodiazepine or ECT.⁵ Although ECT was considered by the psychiatry team, the patient’s presentation of distal extremity tremors, axial dystonia, dysphagia, decreased spontaneous eye blink rate, and speech impairment suggested highly atypical and unreported symptoms of catatonia, which warranted revisiting the differential diagnoses. A literature search of valproic acid-induced parkinsonism will yield multiple case reports, series, and reviews indicating a likely adverse effect. Valproic acid-induced parkinsonism has been reported after months of therapeutic administration and is generally reversible with the withdrawal of valproate.¹¹ We entertained the idea of valproic acid-induced parkinsonism. However, the patient is reported to have been chronically administered a sub-therapeutic dosage of valproate for a couple of years. In addition, 3 days prior the admission, the nursing facility held valproic acid, which was not re-started until day 3–4 of hospital admission. During the period of withholding this patient’s valproic acid, there was no clinical improvement of symptoms and some subjective argument for worsened appearance.

Oliver Sacks’ descriptions of L-dopa-induced “Awakening” of PEP patients described a similar experience with dyskinesias necessitating cessation of L-dopa.¹² This phenomenology is based on the hypothesis that a combination of dopamine depletion followed by hypersensitive dopamine receptors is occurring in EL, resulting in a tenuous dopamine neurotransmission imbalance.² Behavioral disorders are also characteristic features of EL, and are almost universal in historical and contemporary cases (agitation, catatonia, depression, apathy).¹ Hallmark symptoms of EL generally suggest extrapyramidal, behavioral, and sleep disturbances.¹³ Historical EL describes mainly parkinsonism, dystonia, tongue and jaw tremor, abnormal postures, and truncal instability,¹ much of which this case presented.

The pathophysiology of EL is not fully understood. Although commonly occurring in the post-infectious setting, there is no consistent infectious precipitant nor evidence of microorganisms invading the central nervous system.² This case presented with a potential toxic and/or metabolic encephalopathy with postencephalitic parkinsonism. Some case reports have been successful with the use of lorazepam for agitation in suspected EL.² Alternatively, electro-convulsive therapy has been successfully used in catatonic EL.¹⁴ Another case report noted success with steroids in suspected EL, which would support the inflammatory hypothesis of concentrated inflammatory infiltrates to the midbrain and basal ganglia.¹⁵

Recent discoveries appear to point towards a variety of different etiologies of EL-like disorders and within the context of autoimmune encephalitis. There have been increasing descriptions of novel anti-neuronal and anti-glial antibodies that are associated with paraneoplastic and non-paraneoplastic neurological syndromes.¹⁶ Autoimmune encephalitis and paraneoplastic encephalitis were entertained since EL and PEP have been suggested to be autoimmune encephalitides. CSF autoimmune antibodies or IVIG/plasma exchange was not obtained or performed due to the improvement of symptomatology. In addition, the initial CSF analysis did not yield elevated protein and brain MRI did not report abnormal signals, which would be atypical for autoimmune encephalitis.

The clinical presentation and investigative findings to the case presented confirm the role of dopamine in suspected EL and PEP. While the patient may have initially presented with catatonic features, the patient poorly responded to lorazepam and dramatically improved with a dopamine agonist. The etiology of this case presentation remains unclear. While we concurred to a diagnosis of PEP, there was uncertainty in confirming the suspected EL. However, there appeared to be an encephalitic process with new onset parkinsonism, which dramatically improved with the administration of carbidopa and levodopa. While historical contexts appear to still have blurred lines in the definitions of von Economo’s encephalitis, contemporary EL, or PEP, this case supports the considerable reports that suggest the role of dopamine agonists in suspected dopamine-deleted states. Further study should be considered.

Author contributions

Both authors managed the patient, contributed toward data analysis, drafting and critically revising the paper, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.

Acknowledgments

We would like to thank Jia Z Cheng, MD, Department of Neurology, Cooper Neurological Institute, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, NJ, USA, for assistance with manuscript editing.

Disclosure

The authors report no conflicts of interest in this work.