pacing

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pacing

 [pās´ing]
1. regulation of the rate of a physiologic process, such as by providing timed stimuli.
biventricular pacing that in which a lead is used to deliver current directly to the left ventricle, in addition to those used to deliver current to the right atrium and ventricle, so that the ventricles can be induced to pump in synchrony.
cardiac pacing regulation of cardiac rhythm (or the rate of contraction of the heart muscle) with electrical stimuli from a pulse generator or an artificial pacemaker.
diaphragm pacing (diaphragmatic pacing) electrophrenic respiration.
dual chamber pacing control of the heart rate by means of an artificial pacemaker that paces, senses, or does both in the atria and in the ventricles.
single chamber pacing control of the heart rate by an artificial pacemaker that paces and senses in either atria or ventricles, usually in the latter.
transthoracic pacing a system of single or dual chamber epicardial pacing in which the electrode wires are sewn directly onto the epicardium and brought out through an incision in the chest wall. See also epicardial pacemaker.
transvenous pacing a system of single or dual chamber endocardial pacing in which the electrode wires are passed through veins into the right atrium or ventricle. See also transvenous pacemaker.

pacing

/pac·ing/ (pās´ing) setting of the pace.
asynchronous pacing  cardiac pacing in which impulse generation by the pacemaker occurs at a fixed rate, independent of underlying cardiac activity.
burst pacing  overdrive p.
cardiac pacing  regulation of the rate of contraction of the heart muscle by an artificial cardiac pacemaker.
coupled pacing  a variation of paired pacing in which the patient's natural depolarization serves as the first of the two stimuli, with the second induced by an artificial cardiac pacemaker.
diaphragm pacing , diaphragmatic pacing electrophrenic respiration.
overdrive pacing  the process of increasing the heart rate by means of an artificial cardiac pacemaker in order to suppress certain arrhythmias.
paired pacing  cardiac pacing in which two impulses are delivered to the heart in close succession, to slow tachyarrythmias and to improve cardiac performance.
ramp pacing  cardiac pacing in which stimuli are delivered at a rapid but continually altering rate, either from faster to slower (rate decremental or tune down), from fast to faster (cycle length decremental or ramp up), or in some cyclic combination of increasing and decreasing rates; used to control tachyarrhythmias.
synchronous pacing  cardiac pacing in which information about sensed activity in one or more cardiac chambers is used to determine the timing of impulse generation by the pacemaker.
underdrive pacing  a method for terminating certain tachycardias by means of slow asynchronous pacing at a rate not an even fraction of the tachycardia rate.

pacing

Etymology: L, passus, step
setting of the heart's rhythm by the sinus node, by another site in the heart, or by an artificial electrical stimulator. Also called atrial pacing, endocardial pacing, sequential pacing, ventricular pacing. See also programmable pacemaker.

pacing

Cardiology The timing of a physiologic event. See Burst pacing, Demand pacing, DDDR pacing, Dual-chamber pacing, Overdrive pacing, Physiologic pacing, Ramp pacing, Rate responsive pacing, Safety pacing, Transvenous pacing, Underdrive pacing.

pacing

Controlling the rate of an activity, especially the heart rate, usually by electronic devices, such as PACEMAKERS.

pacing

1. normal gait of some horses. See pace.
2. stereotyped pacing; a habit in all caged animals, especially if they are active species and are confined in very small areas. May cause excessive wear in footpads, in snakes the damage is usually to the front of the head.
3. setting the pace or rate of movement. See cardiac pacing.
References in classic literature ?
There was no sleep for me, however, that night as I thought; and instead of attempting to solicit it, I employed myself in rapidly pacing the chamber, having first removed my boots, lest my mother should hear me.
Weekly pacings are no longer a meaningful or accurate measure of the performance and long-term value of radio advertising," said John Hogan, chief executive officer of Clear Channel Radio.
Further, the weekly pacings report's scope covers just 32 of Clear Channel Radio's 250 markets.
Company Will Focus Sales Reporting on Monthly Actuals Report; Concludes Participation in Industry's Weekly Pacing Report
Pacing usually produces certain thoracic discomfort, mainly a burning chest sensation that most patients tolerate; nevertheless, minimizing of the pacing threshold is highly desirable and corresponding studies have been performed from the very early years of the development of this method [14].
Widely studied methods of reducing the stimulus current include finding the optimal position for the pacing electrode, finding suitable position of the patient [15, 16] and geometrical modification of the electrode.
The optimal position of the esophageal pacing electrode has been a subject of continuous discussions since this method was invented.
By gradually increasing the pacing current until stable capture of atrial pacing was confirmed by surface ECG, the pacing threshold of all 9 electrode positions was found.
A standard bipolar transesophageal catheter was inserted through the mouth and pacing was performed at interelectrode spacing of 40 mm and pulse duration of 10 ms.
It was electrically connected to the distal electrode of the esophageal catheter and the pacing threshold was determined again.
In clinical practice, transesophageal cardiac pacing usually causes patients discomfort or pain.
The lead set, exhibiting minimum pacing threshold, was determined (Fig.