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Effect of triggering potential on calculations of jitter in single‐fiber EMG
Author(s) -
Baslo M. Bariş,
Yildiz Nebil,
Yalinay Pinar,
Ertaş Mustafa
Publication year - 2002
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.10131
Subject(s) - jitter , electrophysiology , electromyography , contraction (grammar) , physics , medicine , computer science , physical medicine and rehabilitation , telecommunications
Jitter values are calculated in reference to a triggering potential during single‐fiber electromyography (SFEMG) performed during voluntary contraction. When there are more than two single‐fiber action potentials (SFAP) and the selected triggering potential is from an abnormal end‐plate, all the jitters calculated from the same trace will be affected. In this study, the effect of triggering potential on calculated jitter was investigated in myasthenic and healthy volunteers by switching the triggering potential and recalculating the jitter off‐line. Selecting a triggering potential from an abnormal end‐plate increased the number of abnormal individual jitters as well as the mean jitter. Therefore, if the equipment software has the capacity to change the trigger potential, the triggering potential should not be from an abnormal end‐plate if all possible jitter values are to be calculated for traces having three or more single‐fiber potentials. Otherwise, only one jitter value should be included from any one trace to prevent false‐positive results. © 2002 Wiley Periodicals, Inc. Muscle Nerve 25: 000–000, 2002