One can define the sensitivity of a pacemaker electrode as the minimum myocardial voltage required to be detected as a P wave or R wave, measured in mV. The sensitivity of the pacemaker is actually a setting on the box, where the lower the number, the more sensitive the pacemaker.

What is the medical term for a pacemaker?

A pacemaker is a small device that’s placed (implanted) in the chest to help control the heartbeat. It’s used to prevent the heart from beating too slowly. Implanting a pacemaker in the chest requires a surgical procedure. A pacemaker is also called a cardiac pacing device.

What does pacing mean in medical terms?

: the act or process of regulating or changing the timing or intensity of cardiac contractions (as by an artificial pacemaker)

What does asynchronous pacing mode mean?

Asynchronous modes, VOO or DOO: These are asynchronous pacing modes in which the pulse generator delivers a pacing stimulus at a fixed rate, without any sensing capabilities.

What is stimulation threshold pacemaker?

From 100% pacing, gradually decrease output for A or V, while watching monitor until you lose capture. Now gradually increase output until 1:1 capture returns – this is the stimulation threshold. This is the lowest amount of energy that will reliably capture the heart and pace.

What are pacemaker tissues?

The cells that create these rhythmic impulses, setting the pace for blood pumping, are called pacemaker cells, and they directly control the heart rate. They make up the cardiac pacemaker, that is, the natural pacemaker of the heart.

What do the 3 letters of a pacemaker stand for?

Pacemaker codes Letter 1: chamber that is paced (A = atria, V = ventricles, D = dual-chamber). Letter 2: chamber that is sensed (A = atria, V = ventricles, D = dual-chamber, 0 = none). Letter 3: response to a sensed event (T = triggered, I = inhibited, D = dual – T and I, R = reverse).

What is the sensitivity of a pacemaker?

The actual maximum sensitivity of the pacemaker is very high – when the electrode is freshly inserted, it can potentially detect very subtle changes in local electrical activity. The general range of sensitivity for a normal pacemaker box is 0.4-10mV for the atria, and 0.8-20mV for the ventricles.

What is failure to sense pacemaker?

Failure to sense or undersensing occurs when the pacemaker fails to recognize spontaneous myocardial depolarization. This is recognized by the generation of unnecessary pacing spikes (follow too closely behind the patient’s QRS complexes, occur earlier than the programmed escape interval).

What is sensing in pacemaker?

A pacemaker has two essential tasks: pacing and sensing. Pacing means that the pacemaker paces the heart in case the heart’s own rhythm is interrupted, irregular, or too slow. Sensing means that the pacemaker monitors the heart’s natural electrical activity.

What are the modes of pacemaker?

Most patients can be managed with one of two or three common modes (AAI, VVI, or DDD), with or without rate responsiveness. Contemporary pacemakers are versatile and capable of the most commonly used pacing modes and basic functions (ie, mode switching and rate responsiveness). Some advanced features are available in selected devices.