Editing Holter monitor (section)

===Recorder===

The size of the recorder differs depending on the manufacturer of the device. The average dimensions of today's Holter monitors are about 110x70x30&nbsp;mm, but some are only 61x46x20&nbsp;mm and weigh&nbsp;99 g.<ref>[http://www.superecg.com/en/hearthbug/reliable-and-accurate/ HeartBug technical specifications] {{webarchive|url=https://web.archive.org/web/20131004213531/http://www.superecg.com/en/hearthbug/reliable-and-accurate/ |date=2013-10-04 }}</ref>

Most Holter Monitors monitor the ECG via two or three channels. Depending on manufacturer, different lead systems and numbers of leads are used; the number of leads may be minimised for patient comfort. Two or three channel recording has been used for a long time in the Holter monitoring history; 12-channel Holters were introduced later, using either the standard 12-lead electrocardiograph or the modified (Mason-Likar) [[Cardiac stress test|exercise lead]] system.<ref>{{cite journal | last1=Papouchado | first1=M. | last2=Walker | first2=P. R. | last3=James| first3=M. A. | last4=Clarke | first4=L. M. | title=Fundamental differences between the standard 12-lead electrocardiograph and the modified (Mason-Likar) exercise lead system | journal=European Heart Journal | publisher=Oxford University Press (OUP) | volume=8 | issue=7 | date=1 July 1987 | issn=0195-668X | doi=10.1093/eurheartj/8.7.725 | pages=725–733| pmid=3653124 }}</ref> 

These Holters can occasionally provide information similar to that of an [[ECG]] stress test examination. They are also suitable when analyzing patients after [[myocardial infarction]]. Recordings from these 12-lead monitors are of a significantly lower resolution than those from a standard 12-lead ECG, and in some cases have been shown to provide misleading ST segment representation, even though some devices allow setting the sampling frequency up to 1000&nbsp;Hz for special-purpose examinations such as detection of "late potential".

Another innovation is the inclusion of a triaxial movement sensor, which records the patient's physical activity and, on examination and software processing, extracts three movement statuses: sleeping, standing, or walking. Some modern devices can record spoken patient diary entries that can be listened to.