Crossword Puzzle Analyzing the ElectrocardiogramOnline version Crossword puzzle to test knowledge of Lesson 4: Analyzing the Electrocardiogram. by Dan Comins 1 The portion of the ECG when no electrical activity is detected 2 A rate over 100 beats per minute. 3 A rate less than 60 beats per minute. 4 A rhythm when the R-R intervals are not consistent 5 An early complex occurring before the next expected beat 6 May be indicated by depressed ST segment 7 A beat firing outside the SA node even though the SA node is working 8 A back-up pacemaker beat 9 Represents depolarization of the ventricles 8 7 2 3 6 9 4