NURS 472 Lecture Notes - Lecture 4: Lithium Iodide, Pulse Generator, Artificial Cardiac Pacemaker
19 Jan 2018
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Document Summary
Conditions that result in failure of the heart to initiate or conduct an intrinsic electrical impulse at a rate adequate to maintain perfusion system. Dysrhythmias or conduction defects compromise the electrical system and the hemodynamic response of the heart. Epicardial--- thoracotomy and place electrodes on outside of heart. Permanent--- pacemaker pocket on patients right below clavicle. Lithium iodide battery source and electronic circuits enclosed in a hermetically sealed metal container. Permanent pulse generators are inserted in a subcutaneous pocket in the pectoral region below the clavicle. Communication network between the pulse generator and the heart muscle. One or more electrodes are at the distal end of the lead and provide sensing and pacing of the heart muscle. When intrinsic heart rate drops to the programmed minimum rate, the pacemaker delivers a stimulus through the lead. As a result of this stimulus, the cardiac chamber containing the pacemaker lead is depolarized.
