In the heart, β-adrenergic receptors are primarily responsible for responding to SNS signals. With a sustained block of the SNS, the researchers observed loss of the day-night rhythm in sinus node ...

A New Pacemaker Algorithm for the ... Jude Medical, Cardiac Rhythm Management Division, Sylmar, CA) in patients with sick sinus syndrome and AF. Background. This algorithm increases the pacing ...

Tachycardia-bradycardia syndrome (i.e. pauses after converting to sinus rhythm) Severe sinus bradycardia ... is the leading indication for permanent pacemaker implantation. Withholding drugs ...

creates action potentials faster than the sinus node. This ectopic focus becomes the predominant pacemaker of the heart. When the atrial rate is greater than 100 beats per minute, the rhythm is ...