CSF-neurofilament and levodopa tests combined with discriminant analysis may contribute to the differential diagnosis of Parkinsonian syndromes.
The differentiation between Parkinson's disease (PD), progressive supranuclear palsy (PSP) and multiple system atrophy (MSA) is important for prognostic and therapeutic purposes. In order to evaluate the diagnostic capability of two tests reflecting these items, patients fulfilling strict clinical criteria for PD (n=35), MSA (n=36) and PSP (n=14), were consecutively included. An analysis of neurofilament protein (NFL), a marker of axonal degeneration in the cerebrospinal fluid (CSF) and a levodopa test, recorded with optoelectronic technique were performed. Using discriminant analyses, the test's abilities to predict the clinical PD or non-PD (MSA and PSP) diagnoses were compared. Whereas the CSF-NFL and levodopa tests predicted 79 and 85% correct diagnoses respectively, the combined test predicted 90% correct diagnoses. We conclude that the CSF-NFL and levodopa tests provide detailed information of clinical variables on which the clinical diagnostic criteria are based. As they are pathologically unrelated, the diagnostic precision increases compared to clinical diagnoses when they are combined.
Holmberg
B
B
Institute of Clinical Neuroscience, Department of Neurology, University of Göteborg, Sahlgrenska University Hospital, 413 45, Sweden. bjorn.holmberg@neuro.gu.se
Johnels
B
B
Ingvarsson
P
P
Eriksson
B
B
Rosengren
L
L
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D000978:Antiparkinson Agents; D003937:Diagnosis, Differential; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D007980:Levodopa; D008297:Male; D008875:Middle Aged; D019578:Multiple System Atrophy / Q000134:cerebrospinal fluid / Q000175:diagnosis; D009410:Nerve Degeneration / Q000134:cerebrospinal fluid / Q000473:pathology; D016900:Neurofilament Proteins / Q000134:cerebrospinal fluid*; D020734:Parkinsonian Disorders / Q000134:cerebrospinal fluid* / Q000175:diagnosis*; D013129:Spinal Puncture; D013494:Supranuclear Palsy, Progressive / Q000134:cerebrospinal fluid / Q000175:diagnosis
D000978:Antiparkinson Agents; D016900:Neurofilament Proteins; D007980:Levodopa