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[Comparative study of magnetic resonance and evoked potentials in patients with clinically defined multiple
J Iriarte1, P de Castro, M Gudín
1Departamento de Neurología. Clínica Universitaria de Navarra, Facultad de Medicina, Universidad de Navarra, Pamplona.
Abstract:
In an attempt to establish the efficacy of the most recent diagnostic tests--magnetic resonance (MR) imaging and multimodal evoked potentials (EP), 28 patients with clinically definite multiple sclerosis (MS) (1.a Poser's categories) were studied. The MR was positive in 26 (92%) patients; the EP were altered in 23 (82%)--the visual EP in 18 (64.2%), the auditory EP in 5 (17.8%), and the somatosensory EP in 15 (53.5%). Three patients with abnormal brain stem MR had normal EP. Two patients had normal MR and altered EP. There was not any patient with normal MR and EP. The MR was the most sensitive technique for the diagnosis of MS, but only during the 3 first years of evolution. After this study we consider the convenience to have both MR and EP positive to give a patient the diagnostic of clinically definite with paraclinic support (category 1.b of Poser).
Insights
Magnetic resonance (MR) imaging and evoked potentials (EP) are effective diagnostic tools for multiple sclerosis (MS). Combining MR and EP offers stronger paraclinical support for diagnosing MS.
Area of Science:
- Neurology
- Neuroimaging
- Neurophysiology
Background:
- Multiple Sclerosis (MS) diagnosis relies on clinical presentation and paraclinical evidence.
- Evaluating the efficacy of advanced diagnostic techniques like MR imaging and EP is crucial.
Purpose of the Study:
- To establish the diagnostic efficacy of magnetic resonance (MR) imaging and multimodal evoked potentials (EP) in patients with clinically definite multiple sclerosis (MS).
- To determine the combined diagnostic value of MR imaging and EP for supporting MS diagnosis.
Main Methods:
- Studied 28 patients with clinically definite MS (Poser's category 1.a).
- Assessed the sensitivity of MR imaging and various EP tests (visual, auditory, somatosensory).
Main Results:
- MR imaging was positive in 92% of patients; EP were altered in 82%.
- Visual EP showed alterations in 64.2%, somatosensory EP in 53.5%, and auditory EP in 17.8%.
- No patient had normal MR and normal EP; MR was most sensitive within the first 3 years of MS evolution.
Conclusions:
- MR imaging is a highly sensitive diagnostic tool for MS, particularly in early stages.
- Combining MR imaging and EP enhances paraclinical support for diagnosing clinically definite MS (Poser's category 1.b).
- Concurrently positive MR and EP results strengthen the diagnostic certainty for MS.