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What Are The Causes Of An Excessive Heart Rate
Sinus Tachycardia CausesThe term sinus tachycardia describes a rapid heartbeat where extra beats are caused by an increase in the firing of the sinus, or SA node, the heart's natural pacemaker.
The SA node controls the rate at which the ventricles, the lower chambers of the heart, contract. Exercise, anxiety, fear, excitement, fever, some forms of thyroid disease and smoking all cause sinus tachycardia.
Heavy caffeine intake and drugs such as cocaine or excess alcohol consumption can also cause sinus tachycardia. The effects of sinus tachycardia last only as long as the stimulus occurs and cause no long-term damage,toms shoes for sale. A person with sinus tachycardia might feel like the heart is pounding.
Ventricular Tachycardia CausesVentricular tachycardia originates in the ventricles of the heart. Ventricular tachycardia causes rapid contraction of the ventricles, which doesn't allow them to fill fully with blood. As a result, the body doesn't receive enough oxygen.
Ventricular tachycardia indicates serious damage to the heart, often from a heart attack or damage to the heart muscle, called cardiomyopathy, and must be reversed quickly, within 3 to 5 minutes, to prevent death, the University of Columbia warns,toms outlet. Symptoms include sudden collapse and no pulse.
Supraventricular CausesSupraventricular tachycardia, often called SVT, originates above the ventricles. One type of SVT, Wolf-Parkinson-White syndrome, may have no noticeable symptoms, the University of Columbia states.
Atrial Tachycardia CausesAtrial tachycardia, also called atrial fibrillation, originates in the atria, the upper chambers of the heart. The atria quiver at a rapid rate rather than pumping blood efficiently, resulting in less blood flow through the ventricles and to the rest of the body.
Cardiac factors that lead to atrial tachycardia or atrial fibrillation include heart attack, heart failure, atherosclerosis, recent heart surgery, heart valve disease or infection of the heart. High blood pressure and hyperthyroidism can also cause atrial fibrillation.
Respiratory problems such as emphysema, asthma or blood clots in the lung can lead to atrial tachycardia. It should not be used as a substitute for professional medical advice, diagnosis or treatment. LIVESTRONG is a registered trademark of the Lance Armstrong Foundation. Moreover, we do not select every advertiser or advertisement that appears on the web site-many of the advertisements are served by third party advertising companies. federal causes of action. The adequacy of the state-law ground to support a judgment precluding litigation of the federal claim is a federal question, which this Court reviews de novo. Pp. 361-366. (b) Under the Supremacy Clause, state courts have a concurrent duty to enforce federal law according to their regular modes of procedure. 833,toms shoes cheap. Such a court may not deny a federal right, when the parties and controversy are properly before it, in the absence of a "valid excuse." Douglas v. 747. 327. Pp,www.tomsshoes2013sale.com. 367-375. (c) The District Court of Appeal's refusal to entertain § 1983 actions against state entities such as school boards violates the Supremacy Clause. If that refusal amounts to the adoption of a substantive rule of decision that state agencies are not subject to liability under § 1983, it directly violates federal law, which makes governmental defendants that are not arms of the State liable for their constitutional violations under § 1983. Louis v. Conduct by persons acting under color