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Implantable loop recorder
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Implantable loop recorder : ウィキペディア英語版
Implantable loop recorder

An implantable loop recorder (ILR), also known as an insertable cardiac monitor, is a small device about the size of a pack of chewing gum or USB memory stick that is implanted just under the skin of the chest to record the heart's electrical activity.〔(Implantable Loop Recorder (ILR) System ), with illustrations, Aurora Health Care
==Operation==
The ILR monitors the electrical activity of the heart, continuously storing information in its circular memory (the "loop" of the name) as electrocardiograms (ECGs). Abnormal activity such as arrhythmia (irregular heartbeats) is recorded by "freezing" a segment of the memory for later review. Typically, up to three episodes of abnormal activity can be stored,〔(Diagnostic assessment of recurrent unexplained syncope with a new subcutaneously implantable loop recorder ), Oxford Journals, 2000〕 with the most recent episode replacing the oldest.〔(The Implantable Loop Recorder: Current Uses, Future Directions ), ''The Journal of Innovations in Cardiac Rhythm Management'', 2011〕
Recording can be activated in two ways. First, recording may be activated automatically according to heart rate ranges previously defined and set in the ILR by the physician. If the heart rate drops below, or rises above, the set rates, the ILR will record without the patient’s knowledge. The second way the ILR records is through a hand-held "patient activator" whereby the patient triggers a recording by pushing a button when they notice symptoms such as skipped beats, lightheadedness or dizziness.〔 The ILR records by "freezing" the electrical information preceding, during and after the symptoms in the format of an electrocardiogram.〔 The physician can download and review the recorded events during an office visit using a special programmer, which looks similar to a laptop computer.〔(Implantable Loop Recorder (ILR) ), Brigham and Women's Hospital

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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