Abstract:
Pacing left and right ventricles of the heart for delivery of heart failure therapy involves measuring right ventricular (RV) pressure and a left ventricular (LV) pressure, and computing a parameter developed from one or both of the RV and LV pressure measurements. The parameter is indicative of a degree of left and right ventricular synchronization. At least one parameter of a heart failure pacing therapy is adjusted based on the parameter to improve synchronization of the right and left ventricles.
Abstract:
A method and apparatus for pacing left and right ventricles of the heart involve measuring one or both of a right ventricular (RV) pressure and a left ventricular (LV) pressure, and computing a parameter developed from one or both of the RV and LV pressure measurements. The parameter is indicative of a degree of left and right ventricular synchronization. The parameter is assessed, and an interventricular (V-V) delay is adjusted in response to the parameter assessment. The V-V delay is adjusted to effect a change in the parameter that improves synchronization of the right and left ventricles. The computed parameter is a parameter indicative of hemodyamic state, such as a PP Loop or a pre-ejection period.
Abstract:
Pacing left and right ventricles of the heart for delivery of heart failure therapy involves measuring right ventricular (RV) pressure and a left ventricular (LV) pressure, and computing a parameter developed from one or both of the RV and LV pressure measurements. The parameter is indicative of a degree of left and right ventricular synchronization. At least one parameter of a heart failure pacing therapy is adjusted based on the parameter to improve synchronization of the right and left ventricles.
Abstract:
A body implantable system employs a lead system having at least one electrode and at least one pressure transducer at a distal end. The lead system is implanted within a patient's heart in a coronary vein of the left ventricle. The lead system includes an occlusion device at a distal end to occlude flow in the coronary vein. The pressure transducer is attached to a catheter that is disposed within an open lumen of the lead system. The pressure transducer senses a coronary vein pressure, the coronary vein pressure being proportional to the left ventricular pressure. The sensed coronary vein pressure gives indications of hemodynamic state of the left ventricle, and measured coronary vein pressure can be used to change a signal sent to the electrode to adaptively pace the patient's heart. The body implantable system can further utilize a right ventricular pressure measurement in concert with the left ventricular pressure measurement to modify pacing therapy parameters.
Abstract:
A method and apparatus for predicting acute response to cardiac resynchronization therapy is disclosed. The method can comprise measuring a first interval during an intrinsic systolic cycle and measuring a second interval during a stimulated systolic cycle. The acute response can be predicted by comparing the percent change in duration between the first interval and the second interval against a pre-determined threshold value. The first and second time intervals can be measured using, for example, a surface ECG or, alternatively, an intracardiac electrogram. In one embodiment, the first interval can be the duration of an intrinsic QRS complex measured during a non-stimulated systolic cycle. Similarly, the second interval can be the duration of a stimulated QRS complex measured during a stimulated systolic cycle.
Abstract:
A method and apparatus for predicting acute response to cardiac resynchronization therapy is disclosed. The method can comprise measuring a first interval during an intrinsic systolic cycle and measuring a second interval during a stimulated systolic cycle. The acute response can be predicted by comparing the percent change in duration between the first interval and the second interval against a pre-determined threshold value. The first and second time intervals can be measured using, for example, a surface ECG or, alternatively, an intracardiac electrogram. In one embodiment, the first interval can be the duration of an intrinsic QRS complex measured during a non-stimulated systolic cycle. Similarly, the second interval can be the duration of a stimulated QRS complex measured during a stimulated systolic cycle.
Abstract:
An elongated monopolar or bipolar coronary vein lead having a reduced outer diameter and especially adapted to be advanced into a selected coronary vein for delivering a pacing signal to a predetermined region of a patient's heart, such as the left ventricle. A method of using the lead for pacing a patient's heart in the treatment of heart failure is also described. The method for pacing the heart includes advancing the coronary vein lead through both the coronary sinus and into a selected coronary vein of a patient's heart, connecting the lead to an electrical pacing source and applying electrical stimulation to a particular chamber of the patient's heart via the implanted lead. The lead includes a flexible tip and transition ring that enhances the ability to guide the lead through the coronary veins.
Abstract:
A cardiac rhythm management device in which amplitudes of electrograms from one or more cardiac sites are measured in order to ascertain the extent of hypertrophy. The device may then pace the heart by delivering pacing therapy in a manner that unloads the hypertrophied myocardium to effect reversal of undesirable remodeling.
Abstract:
A cardiac rhythm management device in which amplitudes of electrograms from one or more cardiac sites are measured in order to ascertain the extent of hypertrophy. The device may then pace the heart by delivering pacing therapy in a manner that unloads the hypertrophied myocardium to effect reversal of undesirable remodeling.