Electrical dyssynchrony (cardiac resynchronization index; CRI) was measured at each setting using a multilead ECG system placed over the anterior and posterior torso. Biventricular pacing, which included multiple interventricular delays, was also conducted in a subset of 10 patients. Results: When ...
“can” electrode14for sensing atrial EGM signals. The signal sensed using atrial sensing electrodes includes far-field ventricular signals, similar to that obtained using surface ECG electrodes. During normal IMD operation, atrial sensing electrodes are coupled to atrial EGM sense amplifier102to allow...
sensed or paced atrial depolarization (P-wave), the intervals separating the sensed P-wave from the immediately preceding paced of sensed atrial contraction (P-P Interval) and the interval separating the sensed P-wave from the immediately preceding sensed or paced ventricular depolarization (R-P ...
Transesophageal ventricular pacing was performed in an additional 34 patients. Without the suppression system, ventricular paced activity, recorded from the esophagus, was not suitable for interpretation. About 10% of the atrial electrogram response could be recorded and evaluated during atrial pacing. ...
He now presented to our pacemaker clinic where his ECG done showed two types of paced complexes. The first few complexes were consistent with atrial sensed right ventricular apical pacing with left superior axis. Later complexes showed loss of atrial sensing with pacing from right ventricular out...
METHODS :Firstly, a simple deterministic measurement matrix (SDMM) is used to perform random projection operation on the ECG signals to complete the compression. Then, we use the transpose of the SDMM to perform transpose projection operation on the compressed signals in the cloud to obtain the ...
of a surface ECG. When sensed via a combination of electrodes34,36and42, this wave is referred to as a “far-field” R-wave. The amplitude of the far-field R-wave depends of the distance between the electrodes and the orientation of an axis of lead14B relative to the ventricular mass...
on the order of 150 milliseconds. It is during the T wave that the heart is most vulnerable to induced ventricular fibrillation should the heart be cardioverted during this period. The next ECG cycle begins with the next P wave. The duration of a cardiac cycle may be on the order of 800...
If there has not been a ventricular event sensed, the process continues with step 214 which determines using AV delay timer 96 whether the AV delay has expired. If the AV delay has not expired, the process returns to step 212 to continue looking for a ventricular event. If the AV delay ...
sensing means for sensing natural depolarizations of the patient's heart and generating a P-wave signal in response to a sensed atrial depolarization and an R-wave signal in response to a sensed ventricular depolarization; and control means responsive to said P-wave signal and R-wave signal ...