Is duration of illness really influencing outcome in major psychoses?

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Duration of illness (DI) is increasingly recognized as a critical prognostic factor in major psychoses (MP).
• Understanding DI's impact on treatment response, suicidal risk, cognitive function, and social functioning is crucial for patient outcomes.
• This review synthesizes current literature on DI's effects across different MP diagnoses.

Purpose of the Study:

• To systematically review and synthesize existing medical literature on the duration of illness (DI) in major psychoses (MP).
• To examine the relationship between DI and key patient outcomes, including treatment response, suicidal risk, cognitive impairment, and social functioning.
• To provide a comprehensive overview of DI's predictive value in schizophrenia, bipolar disorder, and major depressive disorder.

Main Methods:

• Comprehensive literature search across major scientific databases.
• Inclusion of studies with diverse methodologies, including open and double-blinded trials.
• Exclusion of studies focusing solely on duration of untreated illness/episode.

Main Results:

• In schizophrenia, longer DI is associated with poorer treatment response, increased suicidal risk, and diminished social functioning; cognitive impairment findings are inconsistent.
• For bipolar disorder, prolonged DI correlates with reduced treatment effectiveness, elevated suicidal risk, and cognitive deficits, though further research is warranted.
• Data on DI's predictive value in major depressive disorder are contradictory, highlighting the need for more conclusive studies.

Conclusions:

• Duration of illness (DI) emerges as a significant negative prognostic factor, especially in schizophrenia.
• For mood disorders (bipolar disorder and major depressive disorder), the impact of DI on outcomes requires further investigation to establish definitive conclusions.