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SAGE Open Med. 2014 Jul 28;2:2050312114545530. doi: 10.1177/2050312114545530. eCollection 2014.

Depression and heart rate variability in firefighters.

Author information

1
School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.
2
Acute andTertiary Care Department at University of Pittsburgh, Pittsburgh, PA, USA.
3
Strong Memorial Hospital, Rochester, NY, USA.

Abstract

INTRODUCTION:

Depression has been found to increase the risk of mortality in patients with coronary artery disease through a mechanism of changing cardiac autonomic tone which is reflected by alteration of heart rate variability indices. This study investigated whether such mechanism existed in firefighters who were at high risk of depression and sudden cardiac death.

METHODS AND RESULTS:

In total, 107 firefighters were recruited. All completed Beck Depression Inventory and underwent 24-h ambulatory electrocardiographic monitoring. The root-mean-square of successive differences, standard deviation of all normal-to-normal intervals index, and the percentage of differences between adjacent normal-to-normal intervals >50 ms were significantly lower in depressed than in non-depressed firefighters after controlling for hypertension, age, and body mass index (40.1 ± 18.8 vs 62.5 ± 77.4, p < 0.01; 63.0 ± 19.2 vs 72.1 ± 34.8, p < 0.01; 8.4 ± 7.2 vs 12.7 ± 10.9, p < 0.01, respectively).

CONCLUSION:

Decreased vagal tone is a possible mechanism linking depression and sudden cardiac death in firefighters.

KEYWORDS:

Depression; firefighters; heart rate variability

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