What is VVI pacemaker?

What is VVI pacemaker?

VVI(R) is ventricular demand pacing. The ventricle is paced, sensed, and the pulse generator inhibits pacing output in response to a sensed ventricular event. This mode of pacing prevents ventricular bradycardia and is primarily indicated in patients with atrial fibrillation with a slow ventricular response.

How does a DDD pacemaker work?

If a pacemaker is in DDD mode, it tries to follow the atrial rhythm. If the atrial rate accelerates, the pacemaker will track it. If the atrial rate becomes too high, there is a MAXIMAL RATE to prevent 1:1 conduction of supraventricular tachycardias which would have rates that would preclude ventricular filling.

What is atrial sensed ventricular paced rhythm?

AAI: The atria are paced, when the intrinsic atrial rhythm falls below the pacemaker’s threshold. VVI: The ventricles are paced, when the intrinsic ventricular rhythm falls below the pacemaker’s threshold. VDD: The pacemaker senses atrial and ventricular events, but can only pace the ventricle.

What is a fixed rate pacemaker?

n. An artificial pacemaker that emits electrical stimuli at a constant frequency regardless of the heart’s rhythm.

What is sinoatrial node dysfunction?

Sinus node dysfunction, previously known as sick sinus syndrome, describes disorders related to abnormal conduction and propagation of electrical impulses at the sinoatrial node. An abnormal atrial rate may result in the inability to meet physiologic demands, especially during periods of stress or physical activity.

What is mA On pacemaker?

The output of a pacemaker is the current (measured in milliamperes, mA) which it produces as a brief pulse. It cannot be an more narrow; the narrower the pulse the higher the voltage required to stimulate the cardiac tissue.

What are the 2 types of pacemakers?

Types of Pacemakers

• Single-chamber pacemaker.
• Dual-chamber pacemaker.
• Biventricular pacemaker.

What is a Dddr pacemaker?

The latest cardiac pacing mode to become available is the dual-chamber, rate-modulated mode (referred to as DDDR), which restores both rate responsiveness and atrioventricular synchrony in patients with sinus node dysfunction and atrioventricular block.

What is a DDD AICD pacemaker?

Equipment Design. Pacemaker, Artificial* Syncope / etiology. Tachycardia, Ventricular / diagnosis. Tachycardia, Ventricular / therapy*