Bradycardiaand the main symptoms
Bradycardiais the medical term for the condition marked by the heart rate that is slower thannormal. If the heart beats slower than 60 times a minute, then the person hasbradycardia. In case when the heart is unable to pump enough blood that isrich in oxygen, bradycardia can be very serious problem. Sometimes, heart rateslower than 60 beats a minute appears in healthy, young adults and trainedathletes, but in these cases, bradycardia is not regarded as a disorder.
Bradycardiais a condition that has its characteristic symptoms. The most frequent warningsigns of this disorder are syncope or fainting, and shortness of breath.Furthermore, dizziness, weakness and fatigue may also appear. The persons whosuffer from bradycardia can also experience pain in the chest, disturbed sleepand confusion or impaired memory.
Causes of bradycardia
Bradycardia has numerous andvarious causes. All that prevents the normal functioning of the electricalimpulses that regulate the heart pumping is considered to be a cause ofbradycardia. Some of the causes of bradycardia are the infection of theheart tissue, hypertension, congenital heart defect, and degeneration of theheart tissue that happens as a result of aging. Furthermore, the causes ofbradycardia may also be hypothyroidism, hemochromatosis, rheumatic fever orlupus and heart attack or stroke. Moreover, medication for some otherheart diseases can be also factors that lead to bradycardia, as well ascomplicated heart surgery, obstructive sleep apnea and electrolytes imbalance.
The sinus node is the naturalpacemaker that produces electrical impulses inducing each heartbeat, andbradycardia appears when these electrical impulses are blocked, or when theyslow down. Sinus node dysfunction is one of the causes of bradycardia thatusually starts there, and this condition can lead to the occurrence ofbradycardia-tachycardia syndrome, or the altering of slow and fast heart rates.
Atrioventricular block, or heartblock, occurs when electrical impulses that are transmitted through theatria are not transmitted to the ventricles, and this condition may alsobe a reason for the appearance of bradycardia. There are four stages ofheart block. The first-degree heart block is the mildest, and in this stage,slowed electrical impulses reach the ventricles. In the case of second-degreeheart block, irregular and slower heart rhythm appears because not allelectrical signals, but only some, reach the ventricles. The third-degree orcomplete heart block occurs when no electrical impulses reach the ventricles.Bundle branch block occurs when the interruption of an electrical signalsomewhere in the right or left bundle branches exists.