We have recently been experiencing problems on determining the correct output from the ECG module concerning the 111 lead output. The lower section of the Q pulse can sometimes be inverted so that any print out from a TRAM 451 does not correspond to the print outs from our ECG machines. Tried changing filters but still this anomoly.Anyone exxperienced the same problem in their CCU ? We have been waiting a few weeks for a reply from GE so thought I'd try here whilst waiting.