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Minor physical anomalies in patients with first-episode psychosis: their frequency and diagnostic specificity

T Lloyd1, P Dazzan, K Dean

  • 1Nottinghamshire Healthcare NHS Trust, Nottingham, UK. Tuhina.Lloyd@nottingham.ac.uk

Psychological Medicine
|July 31, 2007
PubMed
Abstract

Insights

Minor physical anomalies (MPAs) are not exclusive to schizophrenia, appearing in other psychoses too. This suggests a shared developmental origin for these conditions, possibly linked to early pregnancy.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Developmental Biology

Background:

  • Minor physical anomalies (MPAs) are more common in schizophrenia, but their diagnostic specificity is uncertain.
  • Investigating MPAs' prevalence and predictive value in first-episode psychosis is crucial.

Purpose of the Study:

  • To determine if MPAs are specific to schizophrenia.
  • To explore the predictive power of MPAs in first-episode psychosis across diagnoses.
  • To understand potential common developmental pathways in psychosis.

Main Methods:

  • Examined MPAs in 242 first-episode psychosis patients (schizophrenia, affective, substance-induced) and 158 controls.
  • Utilized categorical principal components analysis and ANOVA.
  • Tested significant individual MPA items using the chi-squared test.

Main Results:

  • Facial asymmetry, orbital landmark asymmetry, and Frankfurt horizontal plane differentiated schizophrenia and affective psychosis patients from controls.
  • A V-shaped palate, reduced palatal ridges, and left ear abnormalities were also significant differentiators.
  • Patients with affective psychosis showed significantly lowered eye fissures compared to controls.

Conclusions:

  • MPAs are not specific to schizophrenia, indicating shared developmental origins for affective and non-affective psychoses.
  • The observed MPA distribution suggests a first-trimester organogenesis insult.
  • MPAs may serve as early markers for psychosis risk.

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