Method and apparatus for delaying a ventricular tachycardia therapy
First Claim
1. A method for controlling the delivery of a shock therapy in a cardiac patient experiencing ventricular tachycardia, comprising:
- detecting a ventricular tachycardia;
delivering an anti-tachycardia pacing therapy when said ventricular tachycardia is detected;
determining if the ventricular tachycardia is terminated after said anti-tachycardia pacing therapy is delivered; and
delaying a programmed shock therapy based on measures of hemodynamic state.
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Accused Products
Abstract
A device and method to detect slow ventricular tachycardia, deliver anti-tachycardia pacing therapies, and delay a scheduled shock therapy if the ventricular tachycardia is not terminated or accelerated. Preferably, a shock therapy is delayed after verifying hemodynamic stability based on a hemodynamic sensor. After a shock is delayed, the device operates in a high alert mode for redetecting an accelerated tachycardia. Anti-tachycardia pacing therapies are repeated during the shock delay. A number of conditions can trigger delivery of the delayed shock therapy including a specified period of elapsed time; determination that the patient is likely to be asleep; detection of myocardial ischemia; detection of compromised hemodynamics, or detection of a substantially prone position or sudden change in position. A delayed shock therapy may be triggered by the patient and repeated delivery of painful shock therapies in patients that are not seriously compromised by a recurring, slow ventricular tachycardia is avoided.
65 Citations
18 Claims
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1. A method for controlling the delivery of a shock therapy in a cardiac patient experiencing ventricular tachycardia, comprising:
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detecting a ventricular tachycardia;
delivering an anti-tachycardia pacing therapy when said ventricular tachycardia is detected;
determining if the ventricular tachycardia is terminated after said anti-tachycardia pacing therapy is delivered; and
delaying a programmed shock therapy based on measures of hemodynamic state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A device-implemented software system for controlling the delivery of a shock therapy in a cardiac patient experiencing ventricular tachycardia, the system comprising:
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means for detecting a ventricular tachycardia;
means for identifying if slow ventricular tachycardia is detected;
means for delivering programmed anti-tachycardia pacing therapies;
means for detecting termination of the ventricular tachycardia;
means for sustained redetection of slow ventricular tachycardia;
means for checking hemodynamic instability;
means for delaying programmed shock therapy; and
means for generating patient notification. - View Dependent Claims (16, 17, 18)
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Specification