Faculty Bibliography

Fatigue is commonly reported as an adverse effect of antiepileptic drugs. Ln other disorders, fatigue has been closely correlated with depression. We examined the frequency of fatigue in epilepsy patients, the contribution of depression to fatigue, and the impact of fatigue upon quality of life. We measured fatigue and depression with the Fatigue Severity Scale (FSS) and Center for Epidemiological Studies-Depression scale (CES-D), respectively in 89 patients with epilepsy at an epilepsy center, 26 depressed controls (DC), and 30 normal health adults (NHA). Patients with epilepsy also completed the Quality of Life in Epilepsy (QOLIE-10) scale. Forty-four percent of epilepsy patients met criteria for severe fatigue, while 52% were depressed. The correlation between fatigue and depression was high among epilepsy patients (r = .60, p = .0001). Both fatigue and depression had an inverse relationship with quality of life in epilepsy (p < .0001). Fatigue in epilepsy is common and is closely associated with depression. Fatigue is associated with significant impairment in quality of life in epilepsy. (C) 1998 by Elsevier Science Inc. All rights reserved

Cognitive problems are frequently reported in patients with eosinophilia-myalgia syndrome (EMS). This is the first study to explore, in EMS, the relationship between specific neuropsychological deficits and fatigue and pain. Relationships among depression, sleep disturbance, and neuropsychological deficits in EMS were also examined. Neither fatigue nor pain was correlated with memory impairment. Sleep disturbance was significantly correlated with verbal memory impairment, but not with deficits in visuospatial memory. These results suggest that cognitive loss in EMS cannot be attributed to pain or fatigue. Although some aspects of memory impairment may be associated with disturbed sleep, visual memory deficits are clearly independent of sleep deficits and may result from direct effects of the disease on the central nervous system.

BACKGROUND: Patients with chronic fatigue syndrome (CFS) and post-Lyme syndrome (PLS) share many features, including symptoms of severe fatigue and cognitive difficulty. OBJECTIVE: To examine the neuropsychiatric differences in these disorders to enhance understanding of how mood, fatigue, and cognitive performance interrelate in chronic illness. METHODS: Twenty-five patients with CFS, 38 patients with PLS, and 56 healthy controls participated in the study. Patients with CFS met 1994 criteria for CFS and lacked histories suggestive of Lyme disease. Patients with PLS were seropositive for Lyme disease, had met the Centers for Disease Control and Prevention criteria, or had histories strongly suggestive of Lyme disease and were experiencing severe fatigue that continued 6 months or more following completion of antibiotic treatment for Lyme disease. All subjects completed self-report measures of somatic symptoms and mood disturbance and underwent neuropsychological testing. All patients also underwent a structured psychiatric interview. RESULTS: Patients with CFS and PLS were similar in several somatic symptoms and in psychiatric profile. Patients with CFS reported more flulike symptoms than patients with PLS. Patients with PLS but not patients with CFS performed significantly worse than controls on tests of attention, verbal memory, verbal fluency, and motor speed. Patients with PLS without a premorbid history of psychiatric illness did relatively worse on cognitive tests than patients with PLS with premorbid psychiatric illness compared with healthy controls. CONCLUSIONS: Despite symptom overlap, patients with PLS show greater cognitive deficits than patients with CFS compared with healthy controls. This is particularly apparent among patients with PLS who lack premorbid psychiatric illness.

Lyme disease is the major tick-borne disease, caused by Borrelia burgdorferi (Bb). Neurological involvement is common in all stages. In vivo expression of Bb antigens (Ags) and the immune response to them has not been well investigated in the cerebrospinal fluid (CSF). Upregulation of outer surface protein (Osp) C and concomitant downregulation of OspA before tick inoculation of the spirochete has been reported in skin and blood in animals. CSF OspA Ag in early disease suggests otherwise in CSF. Early Ag expression and IgM response in human CSF was investigated here. Paired CSF and serum was collected from 16 early, predominantly erythema migrans Lyme disease patients with neurologic problems, 13 late Lyme disease patients, and 19 other neurologic disease (OND) controls. Samples were examined for IgM reactivity to recombinant Bb-specific Osps using ELISA and immunoblot. Of 12 early Lyme disease patients with neurologic involvement with both CSF and serum IgM against OspC, 7 (58%) had IgM to OspA (n = 5) or OspB (n = 2) that was restricted to the CSF, not serum. Overall, 12 of 16 (75%) of these early Lyme disease patients with neurologic involvement had CSF and serum IgM against OspC. Only 3 of 13 (23%) late Lyme disease patients and none of 19 OND controls had CSF IgM directed against OspC. In conclusion, in CSF, OspC and OspA can be coexpressed, and IgM response to them occurs in early Lyme disease patients with neurologic involvement. This biologic finding may also provide a discriminating marker for CNS infection in Lyme disease.