I've never worked in a facility with monitor techs. Maybe it's regional? I'm in Boston. RN's are responsible for all rhythm interpretation and for notifying the M.D. of any significant changes. Personally, I don't trust anyone but myself to be responsible for my patients monitor alarms but then again I work on a highly specialized arrhythmia unit and the expectations for rhythm interpretation are high. Ratios are 2-3:1 days/eves and 4-5:1 on nights.