Não tenho a certeza da terminologia usada no Brasil, é apenas uma sugestão. Pela descrição dos textos que se seguem, acho que só poderá ter um nome deste género...
Espero ter ajudado...

The current ECG display procedure, with which many clinicians are dissatisfied, involves an "erase bar." As soon as the ECG is turned on the display unit screen displays a waveform (each pulse representing a heartbeat) which begins on the left most side of the display unit screen and proceeds towards the right side of the display unit screen. Once the waveform reaches the right most side of the display unit screen (such that the waveform extends from the right most side of screen to the left most side of the screen) an erase bar, moving from left to right and starting on the left most side of the screen, begins to erase the waveform. The erase bar typically has a leading edge facing the right side of the display unit screen and a trailing edge facing the left hand side of the screen. As the oldest data points of the first waveform are being erased on the leading edge of the erase bar, new data points are displayed on the trailing edge of the erase bar thus forming a new waveform
http://www.patentstorm.us/patents/5953018-description.html


Method of displaying waveform: moving erase bar and moving trace.
http://www.danica.nl/gastro/manometrie-uk.htm

The erase bar is used for a selective erase function in newer-generation electrophotographic copiers. Since the LEDs are individually addressable and spaced about one millimeter apart, areas as small as single characters can be erased from the photoreceptor before printing the copy
http://findarticles.com/p/articles/mi_m0HPJ/is_n5_v40/ai_784...

método de barra de apagamento. A amplitude do. sinal de ECG pode ser ajustada em 5,10, ou. 20mm/mv. ... advertência, no modo manual, a cada 10 min., para ...
www.ccl.ma.gov.br/pagina.php?Acao=D&IdArq=243&Ext=pdf