Hypsarhythmia was originally spelled with one ‘r’ by Drs Frederick and Erna Gibbs when they coined the term in 1952 . They wished to emphasize that “the term applied to a specific type of electroencephalographic abnormality”, and preferred the specific one ‘r’ spelling to avoid confusion with a literal translation of the two ‘r’ Greek root, “mountainous arrhythmia” [2, 3]. The one ‘r’ spelling was the rule in the 1950s-60s . The two ‘r’ spelling eventually became convention in the literature by the mid-1970s (Figure 1).
Although the Editor of Pediatric Neurology Briefs prefers the single ‘r’ spelling in deference to Dr Gibbs, the intended meaning is accepted for both spellings today.