摘要:
An implantable medical device is connectable to an epicardial left ventricular lead having at least one epicardial electrode and a myocardium penetrating catheter with at least one endocardial electrode and present in a lumen of the lead. The device comprises a pulse generator controller that controls a ventricular pulse generator to generate pulses to be applied to the epicardial and endocardial electrodes. The controller uses an endocardial-to-epicardial time interval or epicardial-to-endocardial time interval to coordinate endocardial and epicardial activation of the left ventricle to thereby achieve cardiac pacing that closely mimics the natural electrical activation pattern of a healthy heart.
摘要:
An implantable medical device is connectable to an epicardial left ventricular lead having at least one epicardial electrode and a myocardium penetrating catheter with at least one endocardial electrode and present in a lumen of the lead. The device comprises a pulse generator controller that controls a ventricular pulse generator to generate pulses to be applied to the epicardial and endocardial electrodes. The controller uses an endocardial-to-epicardial time interval or epicardial-to-endocardial time interval to coordinate endocardial and epicardial activation of the left ventricle to thereby achieve cardiac pacing that closely mimics the natural electrical activation pattern of a healthy heart.
摘要:
The present invention relates generally to methods and systems for optimizing stimulation of a heart of a patient. Hemodynamical index signals reflecting a mechanical functioning of a heart of a patient are recorded at different hemodynamical states. Corresponding hemodynamical reference signals at corresponding hemodynamical states are recorded. At least one hemodynamical index parameter is extracted from the recorded hemodynamical index signals. The at least one hemodynamical index parameter is a measure of the mechanical functioning of the heart and a hemodynamical index model is created, wherein the hemodynamical index model is based on the at least one hemodynamical index parameter and a comparison between output results from the hemodynamical index model and corresponding hemodynamical reference signals. From this hemodynamical index model, a hemodynamical index can be derived, which then can be used in determining patient customized cardiac pacing settings of the cardiac stimulator.
摘要:
An implantable medical device applies an electric signal over two electrodes and measures the resulting electric signal over a candidate pair of neighboring electrodes on a lead for a first heart ventricle or over a candidate electrode of the lead and a case electrode. An impedance signal is determined for each candidate pair or electrode based on the applied signal and the measured resulting signal. A time difference between start of contraction in a second ventricle and the timing of local myocardial contraction as identified from the impedance signal at the site of the candidate pair or electrode is determined for each candidate pair or electrode. An optimal pacing electrode is selected to correspond to one of the electrodes of the candidate pair having the largest time difference or the candidate electrode having largest time difference.
摘要:
An implantable medical device applies an electric signal over two electrodes and measures the resulting electric signal over a candidate pair of neighboring electrodes on a lead for a first heart ventricle or over a candidate electrode of the lead and a case electrode. An impedance signal is determined for each candidate pair or electrode based on the applied signal and the measured resulting signal. A time difference between start of contraction in a second ventricle and the timing of local myocardial contraction as identified from the impedance signal at the site of the candidate pair or electrode is determined for each candidate pair or electrode. An optimal pacing electrode is selected to correspond to one of the electrodes of the candidate pair having the largest time difference or the candidate electrode having largest time difference.
摘要:
In an implantable medical device, such as a cardiac stimulator such as a pacemaker, and method for predicting patient responses to physical exertion, the patient response is monitored over time to evaluate disease progression and pacing therapies of cardiac stimulators are adapted based on the predicted patient response. A current cardiac status indicator for the patient is created indicating a response of the patient to an increased physical activity as a primarily heart rate response or as a primarily a stroke volume response. The pacing parameters of the cardiac stimulator can thereafter be adapted depending on the current cardiac status indicator, wherein the adapted pacing parameters include a first pacing setting if the current cardiac status indicator indicates a primarily heart rate response or a second pacing setting if the current cardiac status indicator indicates a primarily stroke volume response.
摘要:
A late potential detecting system has an implantable medical device connected to at least one cardiac lead having implantable electrodes positioned at different sites of a ventricle myocardium. A sampling unit of the implantable medical device records electrogram samples for the different implantable electrodes to get different sample sets. The electrogram samples of the sample sets are time synchronized and magnitude potential representations of the potential data of the electrogram samples are determined. The magnitude potential representations of the time synchronized electrogram samples are then co-processed and used for determining a parameter that is indicative of any late potentials of the monitored ventricle.
摘要:
In a medical device and method to monitor pulmonary artery pressure of a patient, a first parameter related to the right ventricular straight volume of the patient's is detected, and a second parameter related to the right ventricular ejection rate of the patient's heart, or related to the workload of the patient's heart, is also determined. A pulmonary pressure index is determined by combining the first and second parameters, with variations of the pulmonary pressure index indicating variations in the pulmonary artery pressure. Pulmonary artery hypertension can be monitored with such a device and method.
摘要:
In implantable medical devices such a pacemaker or cardioverter/defibrillators (ICDs) and systems including such a device and an external programmer a measure of a hemodynamic parameter such as the cardiac output, the stroke volume, or the contractility of a patient is used to trend heart failure or in an AV/VV optimization scheme. The implantable medical device is adapted to measure the cardiac impedance and the cardiac impedance data is used to determine impedance morphology curves, which, in turn, are used to compute a measure of the hemodynamic parameter.
摘要:
In an implantable medical device, such as a bi-ventricular pacemaker and a method for detecting and monitoring mechanical dyssynchronicity of the heart, a dyssynchronicity measure indicating a degree of mechanical dyssynchronicity of a heart of a patient is calculated. A first intracardiac impedance set is measured using electrodes placed such that the first intracardiac impedance set substantially reflects a mechanical activity of the left side of the heart and a second intracardiac impedance set is measure using electrodes placed such that the second intracardiac impedance set substantially reflects a mechanical activity of the right side of the heart. The measure of a dyssynchronicity is calculated based on a resulting parameter set from a comparison between at least a subset of the first and the second impedance sets, respectively, the subsets containing information of the mechanical systole, wherein a reduced dyssynchronicity measure corresponds to an improved synchronicity between the right side and the left side of the heart.