[Syndromal versus nosological diagnosis].

Area of Science:

• Psychiatry
• Psychopathology
• Medical Diagnostics

Context:

• Ongoing revisions of diagnostic manuals (ICD-11, DSM-5) prompt reevaluation of psychiatric classification systems.
• The historical debate between syndromal and nosological diagnostic approaches in psychiatry is resurfacing.
• Syndromal approaches gained traction due to their capacity for quantitative-dimensional assessment of psychopathological data.

Purpose:

• To evaluate the merits and limitations of syndromal diagnostic approaches in psychiatry.
• To compare syndromal methods with traditional nosological diagnosis in the context of current diagnostic manual revisions.
• To determine the optimal integration of syndromal and nosological frameworks for psychiatric classification.

Summary:

• Syndromal approaches allow detailed cross-sectional symptom recording but may result in numerous classifications without clear longitudinal or principled organizational aspects.
• Multivariate statistical analyses have failed to consistently map traditional nosological categories onto identified psychopathological syndromes.
• The limitations of syndromal approaches highlight the need for complementary nosological classification, primarily based on psychopathological course, especially given the lack of consistent neurobiological findings.

Impact:

• Informs the ongoing development of psychiatric diagnostic criteria for ICD-11 and DSM-5.
• Suggests a hybrid model for psychiatric diagnosis, integrating dimensional symptom assessment with longitudinal course-based classification.
• Underscores the importance of considering the psychopathological course in psychiatric diagnosis due to current limitations in neurobiological markers.