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Sinus Tachycardia Information
Sinus tachycardia is defined as a heart rate faster than 100 beats/min that is caused by rapid impulse formation from the normal pacemaker; it occurs with fever, exercise, emotion, pain, anemia, heart failure, shock, thyrotoxicosis, or in response to many drugs. Alcohol and alcohol withdrawal are common causes of sinus tachycardia and other supraventricular arrhythmias. The onset and termination are usually gradual, in contrast to paroxysmal supraventricular tachycardia due to reentry. The rate infrequently exceeds 160 beats/min but may reach 180 beats/min in young persons. The rhythm is basically regular, but serial 1-minute counts of the heart rate indicate that it varies five or more beats per minute with changes in position, with breath holding, or with sedation. Rare individuals have persistent or episodic "inappropriate" sinus tachycardia that may be very symptomatic or may lead to left ventricular contractile dysfunction. Radiofrequency modification of the sinus node has mitigated this problem.
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