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Sinus Tachycardia

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Sinustachycardia Sinus tachycardia is [[Sinus_node_rhythms_and_arrhythmias|sinus rhythm]] with a rate of > 100bpm.
Sinustachycardia Sinus tachycardia is an examples of a [[Supraventricular Rhythms|supraventricular rhythm]].In sinustachycardia sinus tachycardia the sinus node fires between 100 and 180 beats per minute and thus , faster than normallynormal. The maximal heartrate heart rate decreases with age from around 200 bpm to 140 bpm. The maximal heartrage heart rate can be estimated by subtracting the age in years from 210. Sinustachycardia Sinus tachycardia normally has a gradual start and ending. Most often sinustachycardia sinus tachycardia is caused by an increase in the body's demand for oxygen, such as during exercise, stress, infection, blood loss and hyperthyroidism. It can also express an effort of the heart to compensate for a reduced stroke volume, as occurs during cardiomyopatycardiomyopathy.
The maximal heart rate is considered to be 220/min minus the age (or more precisely 207-0.7xAge <cite>Tanaka</cite><cite>Robergs</cite>). However , this is often exceeded during vigorous exercise and has a large inter-individual variation.
Appropiate sinustachycardia Appropriate sinus tachycardia can result from: <cite>Surawicz</cite>* exerciseExercise* anxietyAnxiety* alcohol Alcohol / caffeine use* drugs Drugs (e.g. beta-agonists like dobutamine)
The following disease states Inappropriate sinus tachycardia can result in sinustachycardiafrom:* feverFever* hypotensionHypotension* hypoxiaHypoxia* congestive Congestive heart failure* bleedingBleeding* anemiaAnemia* hyperthyroidismHyperthyroidism* cardiomyopathy Cardiomyopathy (with reduced left ventricular function and compensatory tachycardia)* myocarditisMyocarditis
Inappropiate sinustachycardia is rare and characterized by tachycardia at rest and exaggerated acceleration of the heart during physiologic stress. The mechanism leading to an exaggerated response of the sinus node to minimal physiologic stress is incompletely understood.


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