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When major changes are made to a classification, all previous studies using those parts of the classification that are changed must be revisited.
Drug trials according to previous diagnostic criteria must, for example, be repeated if diagnostic criteria undergo major changes, because patients falling under the new diagnosis will be different from those falling under the previous diagnosis.
I sincerely hope that this tradition can be upheld in the future, and that headache can continue to lead the way in the classification of neurological diseases.
Jes Olesen Chairman Headache Classification Committee International Headache Society ICHD-3, like ICHD-2, is now available in digital format.
The respective diagnoses can be viewed and selected in the text area after choosing a main heading.
Using the text, the menu and the search function, answers to specific questions in clinical practice can be researched quickly.
These are examples of the evidence-based process of disease classification that now underpins all future changes to the edition (ICD-11), from the World Health Organization (WHO).
The International Date Line functions as a “” separating two consecutive calendar dates.