Device and method for providing atrial-synchronized ventricular pacing with selective atrial tracking

a technology of atrial tracking and atrial synchronization, which is applied in the direction of electrotherapy, therapy, heart stimulators, etc., can solve the problems of reducing hemodynamic flow and reducing blood flow

Active Publication Date: 2006-11-02
MEDTRONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When damage to one of the high-speed fiber networks occurs, the ventricles may not contract at all or may contract at inappropriate times causing reduced hemodynamic flow.
Problems arise, however, if intrinsic atrial depolarizations become too rapid, a condition known as an atrial arrhythmia.
This results in rapid contractions of the ventricles prior to complete diastolic filling, resulting in diminished blood flow.

Method used

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Embodiment Construction

[0010]FIG. 1 shows implantable medical device (IMD) 10 including right ventricular lead 12, atrial / SVC lead 14, and left ventricular coronary sinus lead 16. IMD 10, in conjunction with leads 12, 14, and 16, is capable of providing cardiac resynchronization therapy (CRT). During normal operation IMD 10 provides bi-ventricular pacing in response to and synchronized with sensed atrial depolarizations. Synchronized bi-ventricular pacing means bi-ventricular paces follow atrial depolarizations (sensed or paced) by an appropriate Atrial-Ventricular (AV) interval. In response to a detected atrial arrhythmia, IMD 10 of the present invention switches from a one-to-one tracking algorithm in which each atrial sense results in synchronized bi-ventricular pacing, to a modified atrial tracking algorithm. With this modified tracking algorithm, IMD 10 still provides synchronized bi-ventricular pacing following an atrial sense; but rather than provide synchronized bi-ventricular pacing following eac...

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PUM

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Abstract

A device for delivering pacing therapy includes an atrial and ventricular leads, sensing circuitry connected to the leads for detecting depolarizations, and pulse generation circuitry for delivering ventricular pacing pulses based on sensed atrial depolarizations. The device includes control circuitry for controlling the pulse generation circuitry in a first mode in which the pulse generation circuitry delivers atrial synchronized pulses to both the right and left ventricular leads in response to each atrial depolarization sensed. In response to a detected atrial arrhythmia, the control circuitry causes the pulse generation circuitry to deliver atrial synchronized ventricular pacing pulses in response only to selected atrial depolarizations.

Description

BACKGROUND OF THE INVENTION [0001] Bi-ventricular pacing, or cardiac resynchronization therapy (CRT), is a method of treating heart failure patients. CRT devices utilize electrical stimulation to resynchronize ventricular contractions with intrinsic or paced atrial contractions in individuals with electrical conduction disturbances. [0002] Normally, electrical pulses originating in the atrium cause the contraction of both the right and left atrium. The contraction causes blood collected in the right and left atrium to be pumped into the right and left ventricles, respectively. The electrical signal continues to travel by way of conduction fibers to the right and left ventricles, causing them to contract. In order to maintain proper hemodynamic flow, it is important that the right and left ventricles contract after the right atrium and left atrium contract. The correct timing is normally maintained by the amount of time it takes electrical signals to conduct along high-speed fibers s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61N1/362
CPCA61N1/3622A61N1/3684A61N1/3627A61N1/36843
Inventor HESS, MICHAEL F.WARMAN, EDUARDO N.
Owner MEDTRONIC INC
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