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Heart Rate Variability Changes in Patients With Major Depressive Disorder: Related to Confounding Factors, Not to
Jan Sarlon1, Angelica Staniloiu2,3,4, Andreas Kordon2,5
1Center for Affective, Stress and Sleep Disorders, Psychiatric Clinics, University of Basel, Basel, Switzerland.
Autonomic nervous system (ANS) reactivity in major depressive disorder (MDD) is complex. Skin conductance during stress and respiration rate during relaxation correlate with symptom severity in MDD patients.
Area of Science:
- Neuroscience
- Psychiatry
- Psychophysiology
Background:
- Major Depressive Disorder (MDD) is a complex condition.
- Understanding the interplay between physiological responses and symptom severity is crucial for effective treatment.
Purpose of the Study:
- To investigate electrophysiological correlates of symptom severity in MDD patients.
- To assess influencing factors on symptom severity under baseline, stress, and relaxation conditions.
Main Methods:
- 89 MDD inpatients completed the Beck Depression Inventory (BDI-II).
- Physiological measures including heart rate variability (HRV), skin conductance (SC), and respiration rate (RR) were recorded.
- Factors like age, blood pressure, and nicotine consumption were evaluated.
Main Results:
- Symptom severity positively correlated with SC during stress and RR during relaxation.
- No significant association was found between HRV and symptom severity.
- Age and higher blood pressure were linked to lower HRV and higher resting heart rate (RHR).
Conclusions:
- Autonomic nervous system (ANS) changes in MDD are complex, highlighting the utility of assessing ANS reactivity to stressors.
- Elevated blood pressure may be underdiagnosed in middle-aged MDD patients.
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