Wiebe, E · Canadian family physician Medecin de famille canadien · 1996
This study looked at two individual ME/CFS patients to see which treatments might help them personally. One patient tried high-dose vitamin B12 injections but they didn't help. Another patient tried a medication called nimodipine and found it worked very well for them. The doctors used a special testing method called N of 1 trials, where treatments are tested in one person at a time to see what actually helps that specific individual.
This study highlights the potential value of personalized treatment testing in ME/CFS, where heterogeneity means patients respond differently to interventions. It suggests that N of 1 trial methodology could be a useful clinical tool for physicians managing individual ME/CFS patients who need to identify which specific treatments work for them.
This study does NOT prove that vitamin B12 is ineffective for all ME/CFS patients or that nimodipine is a general cure—these were only two individual cases. The findings cannot be applied broadly to the ME/CFS population, and single-case responses do not establish causation or provide evidence of efficacy beyond the individuals studied. Placebo effects and natural symptom fluctuation are not controlled for.
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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