Detecting sleep disorders in an active medical device, in particular, an implantable device such as a cardiac pacemaker, a defibrillator, a cardiovertor or a multisite device

• US 20040176695A1
• Filed: 12/19/2003
• Published: 09/09/2004
• Est. Priority Date: 12/24/2002
• Status: Active Grant

• Current Assignee: Sorin CRM SAS (MicroPort Scientific Corp.)
• Original Assignee: Ela Medical S.A. (LivaNova Plc)
• Inventors: Poezevara, Yann
• Granted Patent: US 7,440,795 B2
• Time in Patent Office: Days
• US Class Current: 600/513
• CPC Class Codes: A61N 1/3601 of respiratory organs
• CPC Class Codes: A61N 1/3702 Physiological parameters A61N1/365 takes precedence; evoked response A61N1/371

Abstract

An active medical device, in particular an implantable device such as a cardiac pacemaker, a defibrillator, a cardioverter, or a multisite device, which includes a function for determining sleep disorders. This device is able to collect the heartbeat rate in at least one cavity of the heart, and analyze the rate to evaluate a value of heartbeat rate according to the rate thus collected. The device is able to discriminate in the collected heartbeat rate the spontaneous events sinusal in origin, and to evaluate the heart rate according only to these spontaneous sinusal events, and to analyze the variations in time of the aforementioned heart rate to determine the presence of a sleep respiratory disorder according to these variations. This analysis can be carried out by a search for episodes of bradycardia followed by episodes of tachycardia, or by determination of an index of sinusal variability that is a function of the detected variations and comparison of this index with a predetermined threshold.

Claims

1. An active medical device comprising:

means for collecting a heartbeat rate in at least one heart cavity; and

means for analyzing the collected heartbeat rate and evaluating a value of heart rate as a function of the collected rate;

wherein the means for analyzing the collected heartbeat rate further comprises means for discriminating in said collected heartbeat rate spontaneous events of a sinusal origin, means for evaluating the heartbeat rate as a function of said discriminated sinusal spontaneous events, and means for analyzing variations in time of said heartbeat rate and determining from said variations a presence of a sleep respiratory disorder.

2. The device of claim 1, wherein said analyzing means further comprises means for processing said aforementioned variations and determining therefrom cyclic profiles of episodes of bradycardia followed by episodes of tachycardia.

3. The device of claim 1, wherein the analyzing means further comprises means for determining an index of sinusal variability as a function of said variations, and means for comparing said index with a predetermined threshold.

4. The device of claim 3, further comprising means for memorizing said determined index of sinusal variability.

5. The device of claim 1, further comprising a physiological sensor having an output signal corresponding to the respiratory activity of the patient, and means for correlating said physiological sensor output signal with said means for analyzing the collected heartbeat rate.

6. The device of claim 5 wherein the correlating means further comprises means for confirming an apnea condition as a function of said correlation.