Sinus rhythm is the term for the regular pattern of heartbeats driven by the heart’s natural pacemaker, the sinus node. Variations like sinus tachycardia (fast heart rate) and sinus bradycardia (slow ...

Background A routine sports evaluation identified constant alternation between a junctional and idioventricular rhythm in a 9-year-old child. During exercise testing, electrography demonstrated that ...

The correct diagnosis is sinus bradycardia, AV dissociation, and accelerated junctional rhythm and occasional capture (Figure 2). The other QRS complexes occur at a regular interval and a rate of 42 ...

The electrophysiologic mechanism may be due to either enhanced automaticity or triggered activity. In contrast to the paroxysmal variety, the nonparoxysmal type develops gradually and disappears ...

Patients with recent-onset atrial fibrillation commonly undergo immediate restoration of sinus rhythm by pharmacologic or electrical cardioversion. However, whether immediate restoration of sinus ...

A sinus arrhythmia refers to a problem with the sinus node of the heart. This controls the rhythm of the heart and can be fast (sinus tachycardia) or slow (sinus bradycardia). This article looks at ...

Tachycardia describes when the heart beats faster than normal. Sinus rhythm with tachycardia occurs when the sinus node fires electrical impulses abnormally quickly. Inappropriate sinus tachycardia ...

Sinus tachycardia is a heart rate that is faster than normal, and it can be triggered by exercise, stress, or anxiety. However, it may also indicate an underlying health problem. Symptoms of sinus ...

Bradycardia is a condition characterized by a slower than normal heart rate. While a normal adult heart beats between 60 and 100 times per minute, bradycardia is defined when heart rate falls below 60 ...

Sick sinus syndrome (SSS) is a heart rhythm problem that affects your heart's natural pacemaker. You may develop symptoms of SSS like dizziness, fainting, and fatigue. Treatment may include lifestyle ...