Sinus nodal reentrant tachycardia is an uncommon form of SVT.
Overview
Sinus nodal reentrant tachycardia is a reentrant tachycardia.
It occurs because there is an extra electrical connection within the heart, which may be present from birth.
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Symptoms may include palpitations, lightheadedness, or dizziness.
As with most SVTs, symptoms usually begin abruptly and without any particular warning.
They also disappear equally abruptlymost often after a few minutes to several hours.
For example, performing theValsalva maneuveror immersing their face in ice water for a few seconds.
However, their characteristics differ.
In contrast, IST is an automatic tachycardia.
Consequently, it does not start and stop abruptly but rather, it more gradually accelerates and gradually decelerates.
Also, the heart rate in most people with IST often is never actually entirely “normal.
If more intensive treatment is requiredeither because of frequent episodes or difficulty terminating episodesdrug therapy can be effective.
Medicines like beta-blockers or calcium channel blockers may reduce the frequency of episodes and/or make them easier to stop.
Oxford University Press; 2018:2066-2069. doi:10.1093/med/9780198784906.003.0483
Fogoros RN, Mandrola JM.The electrophysiology study in the evaluation of supraventricular tachyarrhythmias.
