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US 2003/0199936 A1Published application
Atrioventricular delay adjustment
AssigneeMedtronic, Inc.
InventorsChester L. Struble, Lambert Muhlenberg
Life of this patent
Estimating the term…
Abstract
In a system that includes a ventricular pacemaker, the system adjusts an atrioventricular delay to synchronize the onset of isovolumetric contraction with the completion of ventricular filling. The system adjusts the atrioventricular delay as a function of electrical and pressure data from the heart. The system further adjusts the atrioventricular delay as a function of measurements of the time interval between a cardiac occurrence such as a ventricular pace and the completion of ventricular filling. The system may also adjust the atrioventricular delay as a function of the heart rate.
Claims71
An implantable medical device system comprising:
- a pacemaker that paces a ventricle of a heart at an atrioventricular delay following an atrial event;
- a pressure monitor that monitors the onset of isovolumetric contraction of the heart;
- and
- a processor that:
- selects a first interval representing a time between a first cardiac occurrence and an atrioventricular valve closure, wherein the cardiac occurrence is one of an atrial sense, an atrial pace and a ventricular pace;
- measures a second interval as a function of a time between a second cardiac occurrence and an onset of isovolumetric contraction;
- computes a difference between the first interval and the second interval;
- and
- adjusts the atrioventricular delay as a function of the computed difference.
6 more elements
A method comprising:
- selecting a first interval representing a time between a first cardiac occurrence and an atrioventricular valve closure, wherein the cardiac occurrence is one of an atrial sense, an atrial pace and a ventricular pace;
- measuring a second interval as a function of a time between a second cardiac occurrence and an onset of isovolumetric contraction;
- computing a difference between the first interval and the second interval;
- and
- adjusting the atrioventricular delay as a function of the computed difference.
2 more elements
A computer-readable medium comprising instructions that cause a processor to:
- select a first interval representing a time between a first cardiac occurrence and an atrioventricular valve closure, wherein the cardiac occurrence is one of an atrial sense, an atrial pace and a ventricular pace;
- measure a second interval as a function of a time between a second cardiac occurrence and an onset of isovolumetric contraction;
- compute a difference between the first interval and the second interval;
- and
- adjust the atrioventricular delay as a function of the computed difference.
2 more elements
A method comprising:
- measuring a first time interval between a first ventricular pace and a first atrioventricular valve closure at a first heart rate;
- measuring a second time interval between a second ventricular pace and a second atrioventricular valve closure at a second heart rate;
- recording the first time interval as function of the first heart rate;
- and
- recording the second time interval as a function of the second heart rate.
2 more elements
A computer-readable medium comprising instructions that cause a processor to:
- measure a first time interval between a first ventricular pace and a first atrioventricular valve closure at a first heart rate;
- measure a second time interval between a second ventricular pace and a second atrioventricular valve closure at a second heart rate;
- record the first time interval as function of the first heart rate;
- and
- record the second time interval as a function of the second heart rate .
2 more elements
An implantable medical device system, comprising:
- a pacemaker that paces a ventricle of a heart at an atrioventricular delay following an atrial event;
- a pressure monitor that monitors the onset of isovolumetric contraction of the heart;
- and
- a processor that:
- selects a value of a first interval representing a time between a ventricular pace and an atrioventricular valve closure;
- measures a second interval as a function of a time between a second ventricular pace and an onset of isovolumetric contraction;
- computes a difference between the first interval and the second interval;
- and
- adjusts the atrioventricular delay as a function of the difference.
6 more elements
A method comprising:
- selecting a value of a first interval representing a time between a first ventricular pace and an atrioventricular valve closure;
- measuring a second interval as a function of a time between a second ventricular pace and an onset of isovolumetric contraction;
- computing a difference between the first interval and the second interval;
- and
- adjusting an atrioventricular delay as a function of the difference.
2 more elements
A computer-readable medium comprising instructions that cause a processor to:
- select a value of a first interval representing a time between a first ventricular pace and an atrioventricular valve closure;
- measure a second interval as a function of a time between a second ventricular pace and an onset of isovolumetric contraction;
- compute a difference between the first interval and the second interval;
- and
- adjust an atrioventricular delay as a function of the difference.
2 more elements
An implantable medical device system comprising:
- means for pacing a ventricle of a heart at an atrioventricular delay following an atrial event;
- means for monitoring the onset of isovolumetric contraction of the heart;
- and
- means for selecting a value of a first interval representing a time between a first cardiac occurrence and an atrioventricular valve closure, wherein the cardiac occurrence is one of an atrial sense, an atrial pace and a ventricular pace;
- means for measuring a second interval as a function of a time between a second cardiac occurrence and an onset of isovolumetric contraction;
- means for computing a difference between the first interval and the second interval;
- and
- means for adjusting the atrioventricular delay as a function of the difference.
5 more elements
An implantable medical device comprising:
- a pulse generator that applies paces to a ventricle of a heart;
- a controller that controls the pulse generator to deliver each of the paces at an atrioventricular delay following an atrial event, wherein the atrioventricular delay is a function of a difference between a first value representing a time between a first ventricular pace and an atrioventricular valve closure, and a second value as a function of a time between a second ventricular pace and an onset of isovolumetric contraction.
A method comprising:
- measuring a first interval representing a time between a first cardiac occurrence and an atrioventricular valve closure, wherein the cardiac occurrence is one of an atrial sense, an atrial pace and a ventricular pace;
- measuring a second interval as a function of a time between a second cardiac occurrence and an onset of isovolumetric contraction;
- adjusting an atrioventricular delay to cause the first interval to equal the second interval.
Dependencies are inferred from the claim text.