חישה עלייתית
| 12:49 Nov 26, 2016 |
| Hebrew to English translations [PRO] Medical - Medical: Cardiology | |||||||
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| 3 | sensing |
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Answers
1 hr confidence: 
sensing Explanation: ד"א - תפוז www.tapuz.co.il/forums/viewmsg/311/.../צוותי_חירום - לקוצב זה יש אופציית חישה (sensing) כלומר כשאין פעילות עלייתית הקוצב נותן פולס גם לעליות וגם לחדרים אבל הוא יודע לחוש מתי כן יש הפעלה ספונטנית של העליה ואיתה הוא מתזמן ... Basic principles of pacing https://www.blackwellpublishing.com/.../Chow Samp... - dominant pacemaker in the heart, because its rate of depolarization exceeds .... can be the body of the pacemaker pulse generator itself. ..... sensed because there is no sensing in this mode (the second position in the code is ... chest or shoulder) may increase the activity of pacemakers driven by minute. Sensing The heart’s intrinsic electrical activity (i.e. the P wave or QRS complex) transmits a small electrical current (a few millivolts), through the pacemaker leads, to the pulse generator. This current can be registered or sensed by the pacemaker circuitry. Pacemaker sensingdescribes the response of a pacemaker to intrinsic heartbeats. The P waves, or atrial activity, are transmitted through the atrial lead (if present) to the atrial channel of the pacemaker, and sensed as atrial activity. Ventricular activity (the QRS complex) is transmitted through the ventricular lead (if present) to the ventricular channel of the pacemaker, and this is sensed as ventricular activity. For electrical activity to be transmitted from the heart to the pacemaker, a closed electrical circuit must be present, just the same as for an electrical impulse to be transmitted from the pacemaker to the heart. Thus, just as with pacing, sensing can be unipolar or bipolar. Bipolar sensing detects the intrinsic electrical activity occurringbetween the tip electrode and the ringelectrode of the lead. Unipolar sensing detects electrical activity occurringbetween the tip of the lead, and the metal shell of the pulse generator. Because this is a much larger area, other electrical signals, such as might be generated by the muscles of the diaphragm or sources outside the body, are more likely to be detected (and therefore incorrectly interpreted by the pacemaker as heart beats). Troubleshooting the temporary pacemaker circuit - Deranged Physiology www.derangedphysiology.com/.../troubleshooting-temp... - Are the wires detached from the pulse generator? ... This will not take care of oversensing as a cause of pacing failure, but it should defeat undersensing. ... Give up. Time to pace externally while waiting for another wire to be floated, or the epicardial ... Thus, the first step is to increase the pacemaker output. -------------------------------------------------- Note added at 1 hr (2016-11-26 14:17:45 GMT) -------------------------------------------------- Rate response Currently available pacemakers (and defibrillators) can be programmed to vary the pacing rate in response to the patient’s level of activity. Activation of the sensor by changes in these factors, which are not related to exercise, might be a cause of more rapid than expected pacing at rest. For example, hyperventilation or an activity that causes motion of the pacemaker pulse generator (e.g. physical therapy of the chest or shoulder) may increase the activity of pacemakers driven by minute ventilation and accelerometer sensors, respectively. -------------------------------------------------- Note added at 1 hr (2016-11-26 14:18:49 GMT) -------------------------------------------------- Figure 1.12 The second intrinsic complex (a PVC) does not create a large enough signal to be sensed in the ventricular channel with the sensing set at 2.5 mV (dotted line). Therefore, the pacemaker does not recognize the presence of the second intrinsic R wave. (The marker channel at the bottom indicates which intrinsic R waves are sensed by the pacemaker.) If the sensitivity (i.e. the threshold for sensing) had been lowered to 1.5 mV, the second beat would have been sensed. -------------------------------------------------- Note added at 1 hr (2016-11-26 14:19:00 GMT) -------------------------------------------------- page 13-14 |
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