natural pacemaker

natural pacemaker

any cardiac pacing site in the heart tissues, as opposed to an artificial pacemaker.

natural pacemaker

Cardiac pacing That cell or a group of cells within the heart which initiates each contraction. Normally, the S-A node performs the function; but in arrhythmias, cells almost anywhere in the heart can assume the role of the dominant pacemaker
References in periodicals archive ?
The heart beat is normally controlled by a special group of cells called the sinus node that forms a natural pacemaker.
Your heartbeat depends on a natural pacemaker, a small cluster of cells -- it's about the size of a peppercorn, Marban says -- that generates electrical activity.
These impulses override the heart's natural pacemaker, which can no longer control the rhythm of the heart.
Subject to partial settlement to ensure natural pacemaker and implantable cardioverter defibrillator devices and electrodes 2014th may 1 to june 2015.
It occurs when the heart's natural pacemaker, which controls the rhythmic physiological activity, develops abnormal rate or rhythm and interrupts the normal condition.
A new study by a group led by Catherine Proenza, PhD and Roger Bannister, PhD from the University of Colorado School of Medicine reports that one of the reasons for the age-dependent reduction in maximum heart rate is that aging depresses the spontaneous electrical activity of the heart's natural pacemaker, the sinoatrial node.
Most of these medications slow the heart rate, either by calming the sinus node, the body's natural pacemaker, or by slowing down the electrical activity in the heart.
The father-of-two suffers from atrial fibrillation, where abnormal electrical impulses override the heart's natural pacemaker causing its upper chambers to beat in an unusual rhythm.
Atrial fibrillation occurs when abnormal electrical impulses override the heart's natural pacemaker.
During AF, rapid and uncoordinated electrical discharges are generated by the heart's natural pacemaker (sinoatrial node) and other parts of the atria.
The implanted tissue has kept the guinea pig hearts beating after their natural pacemaker cells were destroyed.
She says he suffered from atrial fibrillation, just one form of many fast heartbeats which occur when the heart's natural pacemaker is not working properly.

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