Hi all:I have been a Nurse for the last 3 years. I spent all that time on a med/surg floor.I wanted critical care experience and have taken a new job on a surgical stepdown ICU unit.I started orientation yesterday. There is no formal classroom instruction, it is all computer modules.Yesterday I did the computer modules for the ECG interpretation. I understand how the heart works and I can interpret all the normal strips. I'm having a problem interpreting the abnormal strips. For example: PAC and the heart blocks, the junctional rhythms etc. I've reviewed the modules online at home using different books and practice ECG's on line, but still having difficulties and need to pass a multiple choice test tomorrow.Help! Extremely nervous, and need to pass. Any suggestions on better understanding this information would be very helpful.Thank you all in advance!