Sinus arrhythmia is a variation in the heart's sinus rhythm, usually caused by changes in a person's breathing cycle. It's a ...

Sinus arrhythmia refers to a changing sinus node rate with the respiratory cycle, on inspiration and expiration. This is quite common in young, healthy individuals and has no clinical significance.

AFib causes an irregular heart rate that can make your heart feel as if it is fluttering or skipping beats. Panic attacks, on ...

Sinusitis can cause facial pressure, sinus headache, and other symptoms. Treatment may depend on the cause. A sinus infection, also known as sinusitis or rhinosinusitis, occurs when your nasal ...

With a sustained block of the SNS, the researchers observed loss of the day-night rhythm in sinus node pacemaking and in pacemaking ion channels. Surprisingly, the heart’s local circadian clock ...