Method and apparatus for delaying a ventricular tachycardia therapy
First Claim
1. A method for controlling the delivery of a shock therapy in a patient experiencing ventricular tachycardia, comprising:
- detecting a ventricular tachycardia;
delivering, for a first period of time, an anti-tachycardia pacing therapy when said ventricular tachycardia is detected and ceasing said anti-tachycardia pacing therapy after said first period of time;
thendetermining if the ventricular tachycardia is terminate;
thendetermining a hemodynamic state of said patient;
thendelaying a programmed shock therapy as long as said ventricular tachycardia continues and a predetermined result of said hemodynamic state exists;
thenredelivering, after a second period of time, said anti-tachycardia pacing therapy if said ventricular tachycardia continues and based on said hemodynamic state; and
thendelivering said programmed shock therapy if said ventricular tachycardia continues and based on said hemodynamic state.
0 Assignments
0 Petitions
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.
21 Citations
14 Claims
-
1. A method for controlling the delivery of a shock therapy in a patient experiencing ventricular tachycardia, comprising:
-
detecting a ventricular tachycardia; delivering, for a first period of time, an anti-tachycardia pacing therapy when said ventricular tachycardia is detected and ceasing said anti-tachycardia pacing therapy after said first period of time;
thendetermining if the ventricular tachycardia is terminate;
thendetermining a hemodynamic state of said patient;
thendelaying a programmed shock therapy as long as said ventricular tachycardia continues and a predetermined result of said hemodynamic state exists;
thenredelivering, after a second period of time, said anti-tachycardia pacing therapy if said ventricular tachycardia continues and based on said hemodynamic state; and
thendelivering said programmed shock therapy if said ventricular tachycardia continues and based on said hemodynamic state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system for controlling the delivery of a shock therapy in a patient experiencing ventricular tachycardia comprising:
-
a hemodynamic sensor having a hemodynamic output indicative of a hemodynamic condition of said patient; an implantable medical device comprising; a plurality of electrodes configured to be positioned in said patient; a pacing circuit, having a pacing output, operatively coupled to at least one of said plurality of electrodes; a high voltage circuit, having a high voltage output, operatively coupled to at least one of said plurality of electrodes; a sensing circuit operatively coupled to at least one of said plurality of electrodes, having a sensor output indicative of a cardiac condition of said patient; a microprocessor configured to; identify, based on said sensor output, said cardiac condition; deliver, for a first period of time, said pacing output based on said cardiac condition, ceasing said pacing output after said first period of time;
thenidentify, based on said hemodynamic output, said hemodynamic condition;
thendelay said high voltage output based on said hemodynamic condition and said cardiac condition;
thenredeliver, after a second period of time, said pacing output based on said cardiac condition; and
thendeliver said high voltage output based on said hemodynamic condition and said cardiac condition. - View Dependent Claims (10, 11, 12, 13, 14)
-
Specification