Krankheitsreste: The residual signs of catatonia. A case series.

Background: Catatonic signs were first described by 19th- and 20th-century researchers. An important concept known as "Krankheitsreste," or the residual signs of catatonia, was described by Kraepelin in 1896. Modern researchers describe patients who demonstrate "partial response to the treatment of catatonia with residual signs.