Slower Mac
A slow vein or bradycardia indicates that the heart beats slower than normal. In a normal state, the adult has a heart rate of 60 to 80 per minute, a child of 90 to 140, and an elderly person of 70 to 80 in a stable state. A heart rate of 60 or less for one minute is called bradycardia. In healthy people, bradycardia can occur, especially in athletes who have been persistent in vigorous exercise, the heart is larger than normal, cardiac output increases and heart rate is reduced by athlete's cardiac syndrome, resulting in bradycardia. The bradycardia is a typical example of arrhythmia with tachycardia, and it is considered to be one of relatively common arrhythmias. Dizziness, and syncope are the main symptoms, and heartburn, dyspnea, and helplessness may be symptoms. The causes of bradycardia can be classified into two major types: dysfunctional dysfunction and atrioventricular conduction block.