Heart rate variability in coronary artery disease patients with and without panic disorder

Area of Science:

• Cardiology
• Psychiatry
• Autonomic Nervous System Function

Background:

• Panic disorder (PD) and coronary artery disease (CAD) frequently co-occur, with PD exacerbating cardiovascular outcomes in CAD patients.
• Reduced heart rate variability (HRV) predicts adverse cardiac events and is observed in PD and CAD populations.
• The specific impact of comorbid PD on HRV in CAD patients remains unclear.

Purpose of the Study:

• To investigate heart rate variability (HRV) in patients with both coronary artery disease (CAD) and panic disorder (PD).
• To explore potential mechanisms linking comorbid PD to increased cardiovascular morbidity in CAD.

Main Methods:

• Evaluated HRV using 48-hour electrocardiographic monitoring in 42 CAD patients.
• Compared HRV indices between 20 CAD patients with PD and 22 CAD patients without PD.
• Utilized power spectral analysis to assess cardiac autonomic modulation.

Main Results:

• CAD patients with PD showed significantly lower LF/HF ratios, indicating potentially reduced sympathetic modulation.
• Patients with both PD and CAD had a higher proportion of HF power and lower VLF power compared to non-PD patients.
• No other significant differences in HRV indices were found between the groups.

Conclusions:

• Comorbid PD in CAD patients may be associated with altered autonomic modulation, specifically lower sympathetic activity during daily life.
• These HRV findings do not support changes in HRV as the primary mechanism for the heightened cardiovascular risk observed in CAD patients with PD.
• Further research is needed to elucidate the complex interplay between PD, CAD, and cardiovascular outcomes.