With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Edward VIII was King of the Dominions of the British Empire during his brief role as King of the United Kingdom.
text_B: In medicine , a Holter monitor -LRB- often simply `` Holter '' or occasionally ambulatory electrocardiography device -RRB- is a portable device for continuously monitoring various electrical activity of the cardiovascular system for at least 24 hours -LRB- often for two weeks at a time -RRB- .. medicine. medicine. electrical. electricity. electrocardiography. electrocardiography. The Holter 's most common use is for monitoring heart activity -LRB- electrocardiography or ECG -RRB- .. heart. heart. electrocardiography. electrocardiography. Its extended recording period is sometimes useful for observing occasional cardiac arrhythmias which would be difficult to identify in a shorter period .. For patients having more transient symptoms , a cardiac event monitor which can be worn for a month or more can be used .. cardiac event monitor. cardiac event monitor. The Holter monitor was developed at the Holter Research Laboratory in Helena Montana by experimental physicists Norman J. Holter and Bill Glasscock , who started work on radio telemetry in 1949 .. Norman J. Holter. Norman Holter. radio telemetry. radio telemetry. Inspired by a suggestion from cardiologist Paul Dudley White in the early 1950s , they redirected their efforts toward development of a wearable cardiac monitoring device .. Paul Dudley White. Paul Dudley White. The Holter monitor was released for commercial production in 1962 .. When used to study the heart , much like standard electrocardiography , the Holter monitor records electrical signals from the heart via a series of electrodes attached to the chest .. electrical. electricity. heart. heart. electrocardiography. electrocardiography. Electrodes are placed over bones to minimize artifacts from muscular activity .. The number and position of electrodes varies by model , but most Holter monitors employ between three and eight .. These electrodes are connected to a small piece of equipment that is attached to the patient 's belt or hung around the neck , keeping a log of the heart 's electrical activity throughout the recording period .. electrical. electricity. heart. heart
not_related.