American Journal of Medicine, internal medicine, medicine, health, healthy lifestyles, cancer, heart disease, drugs

Psychiatric Comorbidity and Other Psychological Factors in Patients with “Chronic Lyme Disease”

This study found that misdiagnosis of Lyme disease was common, resulting in repeated and unnecessary antibiotic treatment. Psychiatric comorbidity and other psychological factors were associated with functional outcomes.

Abstract

Background
There is no evidence of current or previous Borrelia burgdorferi infection in most patients evaluated at university-based Lyme disease referral centers. Instead, psychological factors likely exacerbate the persistent diffuse symptoms or “Chronic Multisymptom Illness” (CMI) incorrectly ascribed to an ongoing chronic infection with B. burgdorferi. The objective of this study was to assess the medical and psychiatric status of such patients and compare these findings to those from patients without CMI.

Methods
There were 240 consecutive patients who underwent medical evaluation and were screened for clinical disorders (eg, depression and anxiety) with diagnoses confirmed by structured clinical interviews at an academic Lyme disease referral center in New Jersey. Personality disorders, catastrophizing, and negative and positive affect also were evaluated, and all factors were compared between groups and with functional outcomes.

Results
Of our sample, 60.4% had symptoms that could not be explained by current Lyme disease or another medical condition other than CMI. After adjusting for age and sex, clinical disorders were more common in CMI than in the comparison group.

Conclusions
Psychiatric comorbidity and other psychological factors are prominent in the presentation and outcome of some patients who inaccurately ascribe longstanding symptoms to “chronic Lyme disease.”

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— Afton L. Hassett, PsyD, Diane C. Radvanski, MS, Steven Buyske, PhD, Shantal V. Savage, BA, Leonard H. Sigal, MD

This article was originally published in the September 2009 issue of The American Journal of Medicine.

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