Antidepressants strongly influence the relationship between depression and heart rate variability: findings from The Irish Longitudinal Study on Ageing (TILDA)
Key result
Antidepressant use, rather than depression itself, was associated with significantly lower heart rate variability in older adults, with SSRIs showing less impact than SNRIs or TCAs.
Why the study?
Do antidepressant medications reduce heart rate variability in older adults with or without depression?
Population
4750 older adult participants from the first wave of The Irish Longitudinal Study on Ageing (TILDA)
Comparison
Antidepressant medications vs Controls and depressed participants not taking…
Design
Cross-sectional
Authors
Discussion
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Implication
Antidepressant effects on HRV merit consideration in older adults; hypothesis-generating and should not yet change prescribing or confirm causality.
Study Design
Type
Cross-Sectional (n=4,750)
Multicenter
Yes
Structured PICO
Do antidepressant medications reduce heart rate variability in older adults with or without depression?
P
Population
4,750 community-dwelling adults aged 50 and older in Ireland, assessed cross-sectionally to evaluate the impact of depression and antidepressant use on heart rate variability.
E
Exposure
Antidepressant medications (including SSRIs, tricyclic antidepressants, or SNRIs)
C
Comparator
Controls (not depressed and not taking antidepressants, n=4107) and depressed participants not taking antidepressants (n=317)
O
Outcome
Heart rate variability (HRV) measures including time domain (SDNN) and frequency domain (LF and HF) derived from 10 min supine rest ECGsurrogate
Main Result
Mean Difference: -2
Absolute Event Rate: 39.7% vs 40.7%
p-value: p=0.04
Reductions in heart rate variability observed among depressed older adults appear to be driven by antidepressant medications rather than depression itself.
Limitations
- Use of a self-report measure of depression (CES-D) rather than a formal clinical diagnosis
- Floor effects of age on HRV could have limited the ability to detect an association between HRV and depression
- Cross-sectional design limits causal inferences
- Antidepressant use could be a marker of disease severity
- use of a self-report measure of depression
- floor effects of age on HRV could have limited ability to detect an association between HRV and depression
Cite This Study
O’Regan et al. (2014) conducted a cross-sectional in Depression (n=4,750). Antidepressants vs. Non-depressed controls not taking antidepressants was evaluated on Adjusted standard deviation of normal to normal intervals (SDNN) during paced breathing (MD -2.0, p=0.04). Antidepressant use, rather than depression itself, was associated with significantly lower heart rate variability in older adults, with SSRIs showing less impact than SNRIs or TCAs.