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Heart rate variability before and after treatment with electroconvulsive therapy
S K Schultz1, E A Anderson, P van de Borne
1Department of Psychiatry, University of Iowa, College of Medicine, Iowa City, IA 2242, USA. susan-schultz@uiowa.edu
Journal of Affective Disorders
|June 1, 1997
Summary
Electroconvulsive therapy (ECT) for depression did not increase, but rather decreased, cardiac parasympathetic activity. This reduction correlated with symptom improvement, suggesting resolution of depression, not ECT itself, impacts autonomic function.
Area of Science:
- Cardiology
- Psychiatry
- Autonomic Neuroscience
Background:
- Depression is potentially linked to reduced parasympathetic nervous system activity.
- Electroconvulsive therapy (ECT) is a treatment for severe depression.
Purpose of the Study:
- To investigate the effect of ECT on cardiac parasympathetic activity in patients with depression.
- To test the hypothesis that ECT increases cardiac vagal activity.
Main Methods:
- Assessed respiratory sinus arrhythmia (RSA), a marker of parasympathetic activity, using spectral analysis.
- Measured changes in RSA and heart rate variability (RR interval) before and after ECT in nine patients.
- Correlated changes in RSA with symptom severity using the Hamilton Depression Rating Scale (HDRS).
Main Results:
- ECT significantly reduced Hamilton Depression Rating Scale scores, indicating symptom improvement.
- A significant decrease in the amplitude of respiratory sinus arrhythmia was observed post-ECT.
- Reduced RSA contributed to decreased overall RR interval variability.
- The degree of symptom improvement correlated with the reduction in RSA.
Conclusions:
- Contrary to the hypothesis, ECT was associated with a relative decrease in parasympathetic activity.
- This decrease in parasympathetic activity appears linked to depression symptom resolution rather than ECT treatment itself.
- Further research is needed to clarify autonomic nervous system changes in depression and treatment implications.