Source:http://linkedlifedata.com/resource/umls/id/C0180306
UMD: Defibrillators-pacemakers that are permanently inserted (implanted) either abdominally or pectorally and are connected to the patient's heart through a set of epicardial and/or endocardial leads. These stimulators combine the energy shock capabilities of implantable defibrillators and the pacing mode capabilities of implantable pacemakers to address slowed heart rhythms (bradycardia) or certain classes of cardiac arrhythmias.,MEDLINEPLUS: <p>An <a href='http://www.nlm.nih.gov/medlineplus/arrhythmia.html'>arrhythmia</a> is any disorder of your heart rate or rhythm. It means that your heart beats too quickly, too slowly or with an irregular pattern. Most arrhythmias result from problems in the electrical system of the heart. If your arrhythmia is serious, you may need one of two devices implanted under your skin: a cardiac pacemaker or an implantable cardioverter defibrillator (ICD). </p><p>A pacemaker monitors the electrical impulses in the heart. When needed, it delivers electrical pulses to make the hea