A family study of panic disorder

Area of Science:

• Psychiatry
• Human Genetics
• Epidemiology

Background:

• Panic disorder (PD) is a debilitating condition with potential familial aggregation.
• Understanding the inheritance patterns of PD is crucial for risk assessment and intervention.
• Previous studies suggest a role for both genetic and environmental factors in PD etiology.

Purpose of the Study:

• To investigate the familial aggregation and concordance rates of panic disorder.
• To estimate the increased risk of developing PD based on affected relatives.
• To explore potential genetic or shared environmental influences on PD.

Main Methods:

• Diagnosis of panic disorder in 117 probands using DSM III criteria.
• Family history data collected through proband interviews for parents and siblings.
• Log-linear modeling of binary pedigree data to estimate concordance and cumulative risk.

Main Results:

• No significant difference in concordance rates between parent-offspring and sibling pairs after age adjustment.
• A non-significant negative concordance was observed between spouse pairs.
• The model predicted a fivefold increase in PD risk for individuals with an affected parent or sibling.

Conclusions:

• Familial aggregation of panic disorder is significant, with affected relatives increasing risk.
• Observed concordance patterns are consistent with both genetic and shared family environmental factors.
• Further research, including twin and extended family studies, is needed to elucidate the etiology of panic disorder.