Yes it is true.
Working night shift, causes cardiac problems like Bradycardia.
Working on shifts does not only destroy the circadian rhythms that controls sleep/wake cycle but also many physical and chemical roles in our body keep fluctuating during different times of the day.
One common health problem of night shift workers is coronary heart disease for it is at night that the digestion of food especially high saturated is delayed.
Lack of proper sleep and stressing our body during the night make a night shifters more susceptible to heart attacks.
A slow heart beat indicates how your body takes a change in the sleep cycle thus bradycardia occur.
However, the most common causes of heart failure are coronary artery disease, hypertension or high blood pressure, and diabetes.
Heart failure is a condition in which a problem with the structure or function of the heart impairs its ability to supply sufficient blood flow to meet the body's needs.
Common causes of heart failure include myocardial infarction and other forms of ischemic heart disease, hypertension, valvular heart ,disease,cardiomyopathy and diabetes.
Heart failure can cause a large variety of symptoms such as shortness of breath (typically worse when lying flat, which is called orthopnea), coughing, ankle swelling and reduced exercise capacity. Heart failure is often undiagnosed due to a lack of a universally agreed definition and challenges in definitive diagnosis. Treatment commonly consists of lifestyle measures (such as decreased salt intake) and medications, and sometimes devices or even surgery.
source: mdinfo
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