One of the clearer real-world tests of a treatment's effectiveness is comparing outcomes for the same patient across different approaches — and when years of one method produce little progress while a different method produces substantial, lasting change in a fraction of the time, that comparison carries real clinical weight, even as a single case. This doesn't prove one method is universally superior, but it does demonstrate that treatment approach itself can be a decisive variable, not just the severity of what a patient is working through.
The broader clinical lesson is that stalled progress in therapy isn't always a sign that a patient's trauma is simply too severe to resolve — sometimes it's a sign that the specific treatment modality isn't the right match for how that particular trauma is stored and needs to be processed.
Van der Kolk describes a twenty-one-year-old patient, Kathy, whose father had used her for child prostitution from early childhood — a severity of abuse that had made little progress across three full years of prior conventional therapy. After switching to EMDR, she achieved what van der Kolk describes as the fastest full recovery from severe abuse he had personally witnessed, resolving substantially within eight sessions. Fifteen years later, she was a happily married assistant professor, a long-term outcome that confirmed the recovery wasn't a temporary or superficial improvement.