Failure to sense (FS) is defined as a specified number of consecutive failures to recycle correctly (he pacemaker's timing circuits. Similarly, a specified number of consecutive failures of the stimulus to evoke an active cardiac response is defined as a failure to capture (FC). When FC is ...
Paradoxically, there may be failure to capture — causing bradycardia — because the pacing spikes are very low in amplitude (due to the depleted battery voltage) and because at very high rates the ventricle may become refractory to stimulation Application of a magnet can be life saving but defi...
Although the pacemaker may be functioning normally, in that it is behaving properly with respect to its programmed parameters, failure to capture or properly sense would not be diagnosed from the various diagrams and markers without the simultaneously recorded surface ECG.27 Laddergramming has become...
Evidence of pacemaker malfunction, manifested as failure to capture or to sense spontaneous QRS, was encountered in 95 separate episodes or 43 percent of the total instances of insertion. Malfunction occurred in 45.9 percent of catheter pacemakers inserted through the arm vein and 40.7 percent of ...
Failure to capture occurs when the output stimulus fails to depolarize the myocardium. Causes include lead disconnect or fracture, low battery, low output setting, or an increase in the pacing threshold because of edema or scarring. Failure to sense occurs when the pacemaker ...
arrhythmia. The newest technology (as of the time of writing) in pacemakers is a pacemaker intended to be used for patients incongestive heart failure. There, the pacemaker attempts to stimulate the atrium and ventricle in a pattern that is similar to the heart's natural pattern, a bimodal ...
capture are not perfect, and so a second form of data is obtained after an early ventricular sense. Following the delivered VSP and the capture detection step, the pacemaker looks for the T wave, and times the QT, or stim-T interval from the VSP to the T wave. The running value of ...
1. Cardiac electrical system or failure of impulse propagation where the conduction from atria to the ventricles is delayed or blocked. Since the heart tissue can be activated by external electrical pulses, Brady- cardia can be treated by providing electrical pulses when the heart rate is low. ...
is sensed, the analysis module reduces the playback speed to facilitate study by an operator and activates a visual alarm. The conditions sensed include: failure-to-sense, failure-to-capture, and abnormal bradycardia. Application Number:
insertion of the pacer, from failure of the cardiac pacer to properly control (capture) the heartbeat. This may reflect problems in the electronics, the wire, the placement of the wire, or the myocardinum. The most catastrophic event is failure of the pacer to capture (non-capture). ...