Sinus bradycardiaSinus bradycardia is a sinus rhythm with a heart rate of less than 60 beats per minute in an adult.
Sinus tachycardiaSinus tachycardia is a sinus rhythm with a heart rate greater than 100 beats per minute in adults.
Sinus arrhythmiaSinus arrhythmia (respiratory sinus arrhythmia) is a sinus rhythm with periodic fluctuations in the duration of PP (RR) intervals, typically associated with respiratory phases.
Sinus pauseA sinus pause (sinus arrest) is a temporary cessation of impulse generation by the sinus node, manifested on the ECG by the absence of the expected sinus P wave and...
Sinoatrial blockSinoatrial block (SA block, sinoatrial exit block) is a disorder of impulse conduction from the sinus node to the atria; surface ECG generally cannot determine...
Sick sinus syndromeSick sinus syndrome (SSS) is a dysfunction of the sinoatrial node in which it fails to generate impulses with adequate frequency and rhythmicity...
Tachycardia-bradycardia syndromeTachycardia-bradycardia syndrome is a form of sick sinus syndrome in which episodes of supraventricular tachyarrhythmia (most commonly atrial fibrillation) alternate with marked...
Sinus node re-entrant tachycardiaSinus node re-entrant tachycardia (SNRT) is a paroxysmal supraventricular tachycardia arising via a re-entry mechanism within the...
Inappropriate sinus tachycardiaInappropriate sinus tachycardia (IST) is a persistent elevation in heart rate of sinus origin that is disproportionate to the level of physical, emotional...
Wandering atrial pacemakerWandering atrial pacemaker is a shift in the pacemaker site between the sinus node, various regions of the atria, and the upper part of the AV junction.
Ectopic atrial rhythmAn ectopic atrial rhythm is a replacement or accelerated rhythm in which the pacemaker is not the sinus node, but rather an ectopic focus in the...
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