Method and apparatus for discrimination atrial fibrillation using ventricular rate detection
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61B-005/0452
출원번호
US-0998553
(2001-11-28)
발명자
/ 주소
Wang, Li
Brown, Mark L.
출원인 / 주소
Medtronic, Inc.
인용정보
피인용 횟수 :
105인용 특허 :
46
초록▼
A method and apparatus for method for discriminating heart rhythms includes computing a first predetermined number of RR intervals from received QRS intervals, and computing a median RR interval corresponding to a predetermined number of the first predetermined number of RR intervals. A predetermine
A method and apparatus for method for discriminating heart rhythms includes computing a first predetermined number of RR intervals from received QRS intervals, and computing a median RR interval corresponding to a predetermined number of the first predetermined number of RR intervals. A predetermined beat-to-beat variation and a corresponding predetermined count are determined based on the computed median RR interval. Beat-to-beat variation differences between the first predetermined number of RR intervals are computed and a determination is made as to whether the computed beat-to-beat variation differences are greater than the predetermined beat-to-beat variation, and as to whether a number of the computed beat-to-beat variation differences that are greater than the predetermined beat-to-beat variation is greater than the predetermined count. The heart rhythm is identified as an irregular rhythm in response to the number being greater than or equal to the predetermined count.
대표청구항▼
1. A method for discriminating heart rhythms in an implantable medical device, comprising the steps of:receiving a QRS interval corresponding to the heart rhythm and computing a first predetermined number of RR intervals from the received QRS intervals; computing a median RR interval corresponding t
1. A method for discriminating heart rhythms in an implantable medical device, comprising the steps of:receiving a QRS interval corresponding to the heart rhythm and computing a first predetermined number of RR intervals from the received QRS intervals; computing a median RR interval corresponding to a predetermined number of the first predetermined number of RR intervals; determining a rate zone in response to the computed median RR interval; determining a predetermined beat-to-beat variation corresponding to the rate zone; varying a count in response to the rate zone and the predetermined beat-to-beat variation; computing beat-to-beat variation differences between the first predetermined number of RR intervals; comparing the beat-to-beat variation differences to the predetermined beat-to-beat variation to determine whether the number of the computed beat-to-beat variation differences greater than the predetermined beat-to-beat variation is greater than the count; and identifying the heart rhythm in response to the number of the computed beat-to-beat variation differences relative to the count. 2. The method of claim 1, wherein the step of computing beat-to-beat variation differences comprises calculating the difference of the absolute value of RR(n)-RR(n-1), wherein RR(n) and RR(n-1) are consecutive RR intervals of the first predetermined number of RR intervals.3. The method of claim 1, wherein the step of identifying comprises the steps of:identifying the heart rhythm as an irregular rhythm in response to the number of the computed beat-to-beat variation differences greater than the predetermined beat-to-beat variation being greater than or equal to the count; and identifying the heart rhythm as a regular rhythm in response to the number of the computed beat-to-beat variation differences greater than the predetermined beat-to-beat variation being less than the count. 4. The method of claim 3, wherein the irregular rhythm corresponds to atrial fibrillation.5. The method of claim 1, wherein the predetermined beat-to-beat variation is set equal to 50 ms in response to the rate zone being greater than 500 ms, to 25 ms in response to the rate zone being less than or equal to 500 ms and greater than 400 ms, and to 15 ms in response to the rate zone being less than or equal to 400 ms.6. The method of claim 5, wherein the count is set equal to 8 in response to the rate zone being greater than 400 ms and to 5 in response to the rate zone being less than or equal to 400 ms.7. A method for discriminating between heart rhythms in an implantable medical device, comprising the steps of:computing a first predetermined number of RR intervals from received QRS intervals; computing a median RR interval corresponding to a predetermined number of the first predetermined number of RR intervals; determining a rate zone in response to the computed median RR interval; determining a predetermined beat-to-beat variation and varying a predetermined count in response to the rate zone and the predetermined beat-to-beat variation; computing beat-to-beat variation differences between the first predetermined number of RR intervals; determining whether the computed beat-to-beat variation differences are greater than the predetermined beat-to-beat variation; and determining whether a number of the computed beat-to-beat variation differences that are greater than the predetermined beat-to-beat variation is greater than the predetermined count; identifying the heart rhythm as an irregular rhythm in response to the number being greater than or equal to the predetermined count; and identifying the heart rhythm as a regular rhythm in response to the number being less than the predetermined count. 8. The method of claim 7, wherein the beat-to-beat variation differences are computed by taking the difference of the absolute value of RR(n)-RR(n-1), wherein RR(n) and RR(n-1) are consecutive RR intervals of the first predetermined number of RR intervals, and wherein the irregular rhythm corresponds to atrial fibrillation.9. The method of claim 7, wherein the predetermined beat-to-beat variation is set equal to 50 ms in response to the rate zone being greater than 500 ms, to 25 ms in response to the rate zone being less than or equal to 500 ms and greater than 400 ms, and to 15 ms in response to the rate zone being less than or equal to 400 ms.10. The method of claim 9, wherein the predetermined count is set equal 8 in response to the rate zone being greater than 400 ms and to 5 in response to the rate zone being less than or equal to 400 ms.11. An implantable medical device, comprising:sensing means for sensing cardiac activity of a patient; first detector means for computing a median RR interval in response to a predetermined number of RR intervals associated with the sensed cardiac activity, determining a rate zone in response to the computed median RR interval, determining a variation associated with the determined rate zone, varying a count in response to the rate zone and the variation, computing variation differences between intervals of the predetermined number of intervals, determining whether the number of the computed variation differences that are greater than the determine variation is greater than the count, and outputting a signal in response to the determined number of the computed variation differences relative to the count; and trigger means for receiving the signal from the detector means and initiating storage of the sensed cardiac activity. 12. The device of claim 11, wherein the cardiac activity is determined to be an irregular rhythm in response to the number of the computed variation differences that are greater than the determined variation being greater than or equal to the count.13. The device of claim 12, wherein the irregular rhythm corresponds to atrial fibrillation.14. The device of claim 11, wherein the cardiac activity is determined to be a regular rhythm in response to the number of the computed variation differences that are greater than the determined variation being less than the count.15. The device of claim 11, wherein the determined variation is set equal to 50 ms in response to the rate zone being greater than 500 ms, to 25 ms in response to the rate zone being less than or equal to 500 ms and greater than 400 ms, and to 15 ms in response to the rate zone being less than or equal to 400 ms.16. The device of claim 15, wherein the count is set equal to 8 in response to the rate zone being greater than 400 ms and to 5 in response to the rate zone being less than or equal to 400 ms.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (46)
Nappholz Tibor A. (Englewood CO) Koestner Ken (Englewood CO), Apparatus and method for detecting abnormal cardiac rhythms in dual chamber arrhythmia control system.
Greenhut Saul E. (Aurora CO) Murphy Anthony (Annandale AUX), Apparatus and method for detection of atrial fibrillation by ventricular stability and ventricular pacing.
Krig David B. ; Gilkerson James O. ; Dreher Robert D. ; Wald Jan D. ; Linder William J. ; Zimmer William L., Apparatus and method for treating ventricular tachyarrhythmias.
Bardy Gust H. (Seattle WA) Olson Walter H. (North Oaks MN) Peterson David K. (Mounds View MN) Taepke Robert T. (Fridley MN), Apparatus for detection of and discrimination between tachycardia and fibrillation and for treatment of both.
Holschbach Jean M. (Circle Pines MN) Nichols Lucy M. (Maple Grove MN) Thompson David L. (Fridley MN), Compressed storage of data in cardiac pacemakers.
Steinhaus Bruce M. (Parker CO) Wells Randy T. (Littleton CO), Detection of cardiac arrhythmias using correlation of a cardiac electrical signals and temporal data compression.
Segalowitz Jacob (505 S. Beverly Dr. ; Ste. 1240 Beverly Hills CA 90212), Device-system and method for monitoring multiple physiological parameters (MMPP) continuously and simultaneously.
Salo Rodney W. (Fridley MN) Tockman Bruce A. (Minneapolis MN) Mower Morton M. (Edina MN), Implantable cardiac function monitor and stimulator for diagnosis and therapy delivery.
Vollmann William (N. Lauderdale FL) Mumford Van E. (Miami FL), Implantable cardiac pacer with discontinuous microprocessor, programmable antitachycardia mechanisms and patient data te.
Andersen Hans (Voellingby SEX), Method and apparatus for detecting a sequence of abnormal events in an electrical signal, particularly in the depolariza.
Mader Steven J. (Minneapolis MN) Lisowski John R. (Minneapolis MN) Olson Walter H. (North Oaks MN) Huberty Kenneth P. (Lutz FL), Method and apparatus for discrimination of ventricular tachycardia from supraventricular tachycardia and for treatment t.
Bardy Gust H. (Seattle WA) Olson Walter H. (North Oaks MN) Peterson David K. (Mounds View MN) Taepke Robert T. (Fridley MN), Method and apparatus for discrimination of ventricular tachycardia from ventricular fibrillation and for treatment there.
Corbucci Giorgio (San Giovanni In Persiceto ITX), Method and device for monitoring and detecting sympatho-vagal activity and for providing therapy in response thereto.
Pless Benjamin (Menlo Park CA) Sweeney Michael (Menlo Park CA) Winkle Roger (Palo Alto CA) Nathan Anthony (Bushey Heath GB2), Method for combined cardiac pacing and defibrillation.
Schmid Johann J. (Buchs CHX) Thie Werner (Dielsdorf CHX), Method of, and apparatus for, determining the starting point and the end point of closed signal patterns.
Klein George J.,CAX ; Warkentin Dwight H. ; Riff Kenneth M. ; Lee Brian B. ; Carney James K. ; Turi Gregg ; Varrichio Anthony J., Minimally invasive implantable device for monitoring physiologic events.
Sarkar, Shantanu; Hansen, Daniel L; Neitzell, Grant A; Reiland, Jerry D; Wyszynski, Ryan, Method and apparatus for adjusting a threshold during atrial arrhythmia episode detection in an implantable medical device.
Sarkar, Shantanu; Hansen, Daniel L; Neitzell, Grant A; Reiland, Jerry D; Wyszynski, Ryan, Method and apparatus for atrial arrhythmia episode detection.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.