*Degeneration of heart tissue because of aging *Damage to tissues in the heart from heart attack or heart disease *High blood pressure or hypertension *Congenital heart defect which is disorder present at birth *Heart tissue infection also known as myocarditis -Complication of heart surgery *Hypothyroidism or underactive thyroid gland *Imbalance of electrolytes which are mineral related substances needed for conducting electrical impulses *Obstructive sleep apnea which is the repeated disruption of breathing during sleep. *Inflammatory disease, such as lupus or rheumatic fever *Buildup of iron in the organs known as hemochromatosis *Medications, such as drugs for other heart rhythm disorders as well as high blood pressure and narcotic pain medications may also reduce respiratory rate *Dysautonomia
Bradypnea
Apnea
Hypopnea
Expiratory apnea
Bendopnea
Reflex bradycardia
Cyclospasm
Cornea