E3 PreliminaryPreliminaryPEM not requiredCross-SectionalPeer-reviewedReviewed
Standard · 3 min
["Prolonged" decay test and auditory brainstem responses in the clinical diagnosis of the chronic fatigue syndrome].
Neri, G, Bianchedi, M, Croce, A et al. · Acta otorhinolaryngologica Italica : organo ufficiale della Societa italiana di otorinolaringologia e chirurgia cervico-facciale · 1996
Quick Summary
This study tested whether two hearing-related tests could help diagnose ME/CFS. Researchers examined 21 people with suspected ME/CFS using specialized hearing tests that measure how the brainstem processes sound and how the ear muscles respond to loud noises. When both tests were combined, they correctly identified about 82% of people with ME/CFS, suggesting these tests might be useful diagnostic tools.
Why It Matters
This work explores objective neurophysiological markers for ME/CFS diagnosis at a time when no biomarker exists, potentially offering clinicians a quantifiable diagnostic tool. The combination of two complementary tests showed promise in detecting brainstem dysfunction, an abnormality increasingly recognized in ME/CFS pathophysiology.
Observed Findings
High-frequency ABR (51-71 pps) revealed abnormalities in 10/21 patients: absent first wave (6 cases), wave latency delays (5 cases), or both (1 case)
Prolonged Decay Test showed 71.4% agreement with clinical findings (23.8% false negatives, 4.8% false positives)
Combined ABR and Prolonged Decay Test achieved 81.8% clinical-audiological concordance with zero false positives
Low-frequency ABR (11 pps) showed minimal abnormalities across the sample
High-frequency ABR had 61.9% concordance with clinical findings when used alone
Inferred Conclusions
High-frequency auditory brainstem stimulation is more sensitive than low-frequency stimulation for detecting neurophysiological abnormalities in CFS patients
The Prolonged Decay Test (stapedial reflex assessment) complements ABR findings and improves diagnostic accuracy when combined
Combined neurophysiological testing may be useful for objective CFS diagnosis, though further validation is needed
Brainstem auditory dysfunction appears to be a detectable feature in a subset of CFS patients
Remaining Questions
Do these same auditory abnormalities occur in healthy controls or in other conditions, or are they specific to ME/CFS?
What This Study Does Not Prove
This study does not prove these tests can definitively diagnose ME/CFS, as it lacked a healthy control group and patients with other conditions for comparison. The small sample size (n=21) and cross-sectional design mean the findings require validation in larger, controlled studies before clinical implementation. Abnormalities observed do not explain the cause of ME/CFS or whether they are unique to this condition.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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