Demographic data and urinary catecholamine

Conflict of interest
We have no conflict of interest to declare.
QT interval; Emergency medical responders; Work stress
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1. Introduction
Psychological stress is a normal reaction to a threat or disturbing change in the environment. Stress produces both psychological and physical responses. Together, these responses lead to a biochemical cascade which sets off a flight-fight or freeze reaction by the body.1
The stress response (fight-or-flight/freeze) is a normal reaction that LB Broth, Miller leads to an increase in arousal and the ability to deal with threat. In the absence of a continued threat, the body relaxes and goes back to its normal state of tension. Small doses of daily stress are not unhealthy at all. They are part of life and the body is adapted to handle them. In times of extreme stress, however, synapsis stress response can become turned on at all times, with no relaxation. This can have serious physical and psychological consequences.2
It is possible that there is a discrepancy between an experience of mental distress and objectively assessed life event stress. Usually, image however, stressful life events lead to prolonged mental stress, which in turn, may impair one’s physiological ability to cope with acute stress.3 Prolonged mental stress has been related to unpleasant effects and behavioral inhibition, and has been shown to predict myocardial infarction.4 and 5 Mental stress has also been shown to have an influence on sudden cardiac death, ventricular arrhythmias and cardiac autonomic function.6
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