Unipolar Cautery - can cause sensing and pacing malfunction as well as reprogrammingÄifferential Diagnosis Pacemaker Malfunction Problems with pocket.Cardioversion: Use AP pads >8cm from device to minimize adverse effects.MRI: mostly safe, consult cards on device specific recs.Airport security: may trigger alarm, no alteration of activity.Cell phones: do not interact with device.Manufacturer code on pulse generator is visible on Chest Xray.Boston Scientific Inc.: 100 bpm 85 bpm when battery is ready for replacement.Jude Medical Inc.: 98.6 bpm 86.3 bpm when battery is ready for replacement Medtronic Inc.: 85 bpm 65 bpm when battery is ready for replacement.Magnet mode - with placement of a magnet over the device, the mode changes to asynchronous (i.e.(recently acquired by Abbott, Inc.) (1-80) Manufacturer Hotline has patient database.Patient most often has a pocket card indicating manufacturer.Keeps a rate histogram, as well as % of time spent in AF.Keeps track of % of paced vs intrinsic beats.Can record rhythm strips of AF, VT, and VF episodes for later review.Rarely, externally placed electrode during open surgical procedure.Coronary veins along external LV wall via coronary sinus. Left Ventricle (most commonly placed for cardiomyopathy or CHF).Neurocardiogenic Syncope and Carotid Sinus Syndrome.Cardiac Resynchronization Therapy- Conduction delay (>150msec with mortality benefit) in chronic systolic heart failure further decreases EF, increases remodeling and increased MR.After Acute MI-high mortality with persistent AV block post MI.Chronic Bifascicular or Trifascicular block.
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