temporary pacemaker


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Related to temporary pacemaker: external pacemaker, Permanent pacemaker

pacemaker

 [pās´māk-er]
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.

temporary pacemaker

An electronic device for temporary cardiac pacing (e.g., during cardiac surgery and emergencies). The device consists of an electrode catheter inserted transvenously in the right ventricular apex that receives impulses from an external generator.
See also: pacemaker
References in periodicals archive ?
Mukhopadhyay et al., "Nonsurgical management of cardiac tamponade caused by a temporary pacemaker lead," Pacing and Clinical Electrophysiology, vol.
The fact that the misplaced temporary pacemaker lead did not disrupt the mass also argued against the presence of a cardiac thrombus.
Placement of temporary pacemaker is lifesaving especially if arrhythmias do not respond to atropine15.
Doctors at the AMRI Hospital have stated that his heartbeat has dropped below 50 when the normal is 60 and a temporary pacemaker has been installed.
If the goal is to create complete heart block, a temporary pacemaker must be inserted to ensure ventricular capture.
Dr Stables will insert a temporary pacemaker into the right side of the patients' hearts and place a tube into a blood vessel leading to the affected area.
Request for quotations : barmt # 376/19 whitehead rotators or similar type (lot 1); conicotomy kit (lot 2); biopsy forceps (lot 3); electrode catheter for setting a temporary pacemaker (lot 4); ultrafilter u9000 to the device artificial kidney
Independent predictors of cardiac perforation after pacemaker implantation were reported to be the use of a temporary pacemaker, helical screw-in leads, and oral steroid therapy [2].
Temporary pacemaker (TPM) transvenous lead was used in 134(92.41%) patients.
Later, after Helen, 60, had a temporary pacemaker fitted, doctors said Ross's actions had saved her life.
The placement of a temporary pacemaker in our patient appears to have sufficed and she did not require permanent pacemaker in the long run.

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