artificial pacemaker

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1. an object or substance that controls the rate at which a certain phenomenon occurs.
3. in biochemistry, a substance whose rate of reaction sets the pace for a series of interrelated reactions.
artificial pacemaker an electronic cardiac pacemaker that has a pulse generator to generate an extrinsic electrical impulse, causing the heart muscle to depolarize and then contract; its rate is preset regardless of the heart's intrinsic activity. It can be either temporary (transcutaneous, transvenous, or epicardial) or implanted.
asynchronous pacemaker an implanted pacemaker that delivers stimuli at a fixed rate, independent of any atrial or ventricular activity; this type is now rarely used except to initiate or terminate some tachycardias.
AV sequential pacemaker an implanted pacemaker with dual chamber pacing that maintains the atrial part of ventricular filling by stimulating the atrium if it does not respond at the proper interval after ventricular activity; used for patients with abnormal sinus node function or decreased atrioventricular conduction.
cardiac pacemaker a small mass of specialized muscle tissue in the heart that sets a rhythm of contraction and relaxation for the other parts of the heart, resulting in the heartbeat. Usually the pacemaker site is the sinoatrial node, near the junction with the superior vena cava. The normal rhythm, 60 to 100 contractions per minute, increases during physical or emotional stress and decreases during rest. The pace varies from person to person and is affected by abnormal conditions such as heart injuries and generalized infections. If the normal pacemaker fails to function, its regulating task may be taken over by another small mass of special muscular tissue, the atrioventricular node.
DDD pacemaker dual chamber pacemaker.
demand pacemaker an artificial pacemaker that activates only when it receives sensations indicating a lack of adequate spontaneous rhythm by the heart. It thus avoids competition with the patient's own natural pacemaker.
diaphragmatic pacemaker phrenic pacemaker.
dual chamber pacemaker an implanted pacemaker having two leads, one in the atrium and one in the ventricle, so that electromechanical synchrony between the chambers can be approximated. Called also DDD pacemaker.
A dual chamber pacemaker senses and paces in both the atrium and the ventricle.
ectopic pacemaker any biological cardiac pacemaker other than the sinoatrial node; under normal conditions it is not active.
electronic pacemaker artificial pacemaker.
epicardial pacemaker a temporary pacemaker whose leads are attached to the epicardial surface; usually used in the diagnosis and treatment of postoperative dysrhythmias.
escape pacemaker an ectopic pacemaker that assumes control of cardiac impulse propagation because of failure of the sinoatrial node to generate one or more normal impulses.
external pacemaker an artificial pacemaker located outside the body; the primary types are transcutaneous and transvenous. See also temporary pacemaker.
gastric pacemaker a saddle-shaped area of the greater curvature of the stomach at the junction of its proximal and middle thirds, which regulates the frequency of gastric contractions.
implantable pacemaker (implanted pacemaker) an artificial pacemaker implanted within the body.
phrenic pacemaker the device used in electrophrenic respiration; it converts radiofrequency signals into electrical impulses that stimulate the phrenic nerve, resulting in descent and flattening of the diaphragm and improved inhalation of air. Called also diaphragmatic pacemaker.
synchronous pacemaker an implanted pacemaker that synchronizes the physiological events in the atrium with those of the ventricle; it stimulates the ventricle when triggered by the P wave from the atrium.
temporary pacemaker an artificial pacemaker in which the pulse generator is not implanted, usually either a transcutaneous or transvenous pacemaker. See also external pacemaker.
transcutaneous pacemaker a temporary pacemaker in which large surface, high impedance electrodes are applied to the anterior and posterior chest walls to deliver high current stimuli of long duration for pacing of the ventricles.
transvenous pacemaker an artificial pacemaker, either external or implanted, that is connected to the heart by pacing leads passed through the venous circulation to make contact with the endocardium of the right atrium or right ventricle.
uterine pacemaker either of the two regulating centers that control uterine contractions, located near the openings of the fallopian tubes. When the fetus is ready to be born the pacemakers set off a series of rhythmic contractions in the uterine muscle that gradually force the infant out into the birth canal.
wandering pacemaker a condition in which the site of origin of the impulses controlling the heart rate shifts from the head of the sinoatrial node to a lower part of the node or to another part of the atrium.

ar·ti·fi·cial pace·mak·er

any device that substitutes for the normal pacemaker and controls the rhythm of the organ; especially an electronic cardiac pacemaker, which may be implanted in the chest, with electrodes attached to the external cardiac surface, or passed through the venous circulation into the right side of the heart (pervenous pacemaker).

artificial pacemaker

See pacemaker.

ar·ti·fi·cial pace·ma·ker

(ahr'ti-fish'ăl pās'mā-kĕr)
Any device that substitutes for the normal pacemaker and controls the rhythm of the heart; especially an electronic cardiac pacemaker, which may be implanted in the chest, with electrodes attached to the external cardiac surface, or passed through the venous circulation into the right side of the heart (pervenous pacemaker).

artificial pacemaker


artificial pacemaker

; cardiac pacemaker implanted electronic device that regularizes cardiac function (heart rate and rhythm) in patients with bradycardia or asystole; electrosurgery units interfere with pacemaker function and are contraindicated in patients with an indwelling pacemaker; a pacemaker patient may develop bradycardia, lapse into unconsciousness and require cardiopulmonary resuscitation (CPR) following accidental or relative overdose of local anaesthetic
References in periodicals archive ?
Dr Bilal said that the main aim and theme of this conference is to develop the field of Cardiac Pacing and Clinical Electro physiology in the region and especially in Pakistan where the field is evolving very rapidly.
The way we've practiced cardiac pacing for the last 3 decades must be abandoned," said Michael O.
About EBR Systems: EBR's wireless pacing technology (WiCS) was developed to eliminate cardiac pacing leads, historically an impediment to efficacy and major source of complications and reliability issues.
Contract notice: Supply of pacemakers and cardiac pacing leads.
The world survey of cardiac pacing and cardioverter-defibrillators: Calendar year 2005.
Aimed at biomedical engineers, it provides an introduction to cardiac pacing and defibrillation.
director of Cardiac Pacing and Tachyarrhythmia Devices at the Cleveland Clinic, principal investigator in the trial and a paid consultant for Medtronic who serves on several Medtronic advisory boards and also receives royalty payments from Medtronic for technology he developed.
Often referred to as "ablate and pace" therapy, AV junction ablation, which produces complete AV block to assure heart rate control and rhythm regulation, followed by implantation of a cardiac pacing device, is a routine, clinically validated treatment for patients with symptomatic, drug-refractory permanent AF.
Contract award: supply of equipment and electrodes for cardiac pacing and balloon catheters and guidewires angioplasty
March 6, 2013 /PRNewswire/ --ICAP Patent Brokerage announces for auction an IP package of leadless cardiac pacing devices from Magnetic Pacing Technologies GmbH and the University of Duisburg-Essen.
The WiCS([R]) cardiac pacing system represents a significant medical breakthrough, eliminating the cardiac pacing lead by stimulating the heart through wireless transmission of energy.