Other leads will span only about 2.5 seconds. Each ECG is divided by large boxes and small boxes to help measure times and distances. Each large box represents 0.20 seconds, and there are five ...

There are two different rates that can be determined on an ECG. The atrial rate is indicated ... If two consecutive R waves are separated by only one large box, then the rate is 300 beats per ...

Department of Family Medicine, University of Washington, Seattle, Washington, USA Correspondence to Professor Jonathan A Drezner, Department of Family Medicine, University of Washington, P.O. Box ...

Box 354410, Seattle, WA 98195, USA; jdrezner{at}fammed.washington.edu Background Interpretation of ECGs in athletes is complicated by physiological changes related to training. The purpose of this ...

A television commercial cannot influence viewers who have switched to another channel. Yet, billions of dollars in television advertising are bought each year without precise measurement of the ...