Catatonia as a putative nosological entity: A historical sketch

Area of Science:

• Psychiatry
• Neurology
• Medical History

Background:

• Kahlbaum first proposed catatonia as a distinct disease, but its nosological status remained debated.
• Kraepelin's classification of catatonia as a schizophrenia subtype significantly influenced its diagnostic categorization for decades.
• Previous diagnostic systems, including early DSM editions, largely followed Kraepelin's restrictive view, hindering independent research.

Purpose of the Study:

• To review the historical evolution of catatonia's diagnostic classification.
• To highlight recent shifts in understanding catatonia as a potentially independent entity.
• To examine the implications of new DSM-5 categories for catatonia research.

Main Methods:

• Historical analysis of psychiatric nosology concerning catatonia.
• Review of Kraepelinian and post-Kraepelinian classification systems.
• Examination of diagnostic criteria changes across DSM editions, particularly DSM-5.

Main Results:

• Catatonia's diagnostic journey reflects a shift from a syndrome to a distinct disorder.
• DSM-5 introduced new categories, including 'Unspecified Catatonia', facilitating independent study.
• The deletion of 'catatonic schizophrenia' marks a significant departure from historical classifications.

Conclusions:

• Recent diagnostic revisions in DSM-5 support the investigation of catatonia as a separate diagnostic entity.
• The 'Unspecified Catatonia' category may foster research into catatonia's unique pathophysiology and treatment.
• Re-evaluating catatonia outside the schizophrenia spectrum is crucial for advancing clinical understanding and patient care.