Search results
Results from the WOW.Com Content Network
Bradycardia arrhythmia may have many causes, both cardiac and non-cardiac. Non-cardiac causes are usually secondary and can involve recreational drug use or abuse , metabolic or endocrine issues, especially hypothyroidism , an electrolyte imbalance , neurological factors, autonomic reflexes , situational factors, such as prolonged bed rest ...
Often sinus node dysfunction produces no symptoms, especially early in the disease course. Signs and symptoms usually appear in more advanced disease and more than 50% of patients will present with syncope or transient near-fainting spells as well as bradycardias that are accompanied by rapid heart rhythms, referred to as tachycardia-bradycardia syndrome [4] [5] Other presenting signs or ...
Rhythm strip of sinus bradycardia at 50 bpm. Sinus bradycardia is commonly seen in normal healthy persons and athletes in the absence of pathophysiological diseases or conditions. [1] Different factors or etiologies could lead to the dysfunction of the sinus node, causing a malformation or prolongation of the impulse.
Reflex bradycardia is a bradycardia (decrease in heart rate) in response to the baroreceptor reflex, one of the body's homeostatic mechanisms for preventing abnormal increases in blood pressure. In the presence of high mean arterial pressure , the baroreceptor reflex produces a reflex bradycardia as a method of decreasing blood pressure by ...
Norepinephrine (Levophed) is the most common first-line vasopressor for people who don't respond well to other hypotension treatments such as fluid resuscitation. Atropine is administered for bradycardia. It acts on the vagus nerve so it's not effective in heart transplant patients as the vagus nerve is severed during the transplant.
Wandering atrial pacemaker may be seen in young, healthy individuals as well as in the elderly and those with lung disease. [2] The cause of wandering atrial pacemaker is unclear. Increased tone from the vagus nerve may factor into the rhythm appearing in young, healthy individuals who exercise. The vagus nerve is a part of the parasympathetic ...
Heart attacks occur when a blood clot causes a blockage in the arteries of the heart like the one described above. Risk factors include diabetes, a family history of premature heart disease, high ...
Uptake of acetylcholine in axoplasm is prevented and the presynaptic nerve releases more acetylcholine into the synapse, which initially causes bradycardia. In the atrioventricular node, the resting potential is lowered, which facilitates conduction. This is seen as a shortened PR-interval on an electrocardiogram.