ECG in sinus tachycardia of the heart
Sinus tachycardia is defined as sinus rhythm with a frequency higher than 100 beats / min. The cause of sinus tachycardia may be physical exertion, emotional stress, or any other condition leading to the activation of the sympathetic nervous system.
Sometimes sinus tachycardia may be inadequate. A possible cause is hyperthyroidism, but often the cause remains unclear. Most often this is observed in young women. A high heart rate is usually constant and shows an additional excess increase in response to physical exertion arising immediately after its onset.
Less commonly, inadequate sinus tachycardia occurs as a result of primary disturbances in the sinus node itself (re-entree of the sinus node).
Since sinus tachycardia is usually a physiological response, it rarely needs special treatment. However, if sinus tachycardia is inadequate, the heart rate can be reduced with the help of BAB or ivabradine, which is a selective inhibitor of the automatic function of the sinus node.
If the patient does not have a serious disease, then the heart rate at rest rarely exceeds 100 beats / min. Therefore, when detecting apparent sinus tachycardia at rest, the likelihood of a different heart rhythm, such as atrial tachycardia or atrial flutter (TP), should be considered.