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Chapter 5 : 

Chapter 5 ECG Tools

ECG Tools : 

ECG Tools Various tools help you read and interpret ECGs: Calipers Axis-wheel ruler ECG ruler Straight edge

Using Calipers : 

Using Calipers Place one of the pins at beginning of object to be measured, and move the other pin to the end. Transfer distance to uncluttered part of ECG to evaluate height or time of measured object.

Measuring Distances Between Complexes : 

Measuring Distances Between Complexes

Walking Calipers : 

Walking Calipers You can walk calipers back and forth across an ECG to check the regularity of complexes. You can take that distance and move it anywhere on the paper.

Comparing Wave Heights : 

Comparing Wave Heights Use calipers to measure heights of waves Useful when determining the axis of the heart In this figure: Depth of negative wave is 7.0 mm Height of positive wave is 10.8 mm

Adding Wave Heights : 

Adding Wave Heights To add negative depth of one wave to positive height of another in a different lead: Start by measuring negative wave of complex in first lead. Place your calipers (open to same distance from A) on top of positive complex in second lead. Without moving the top pin, extend bottom pin to base of wave.

Comparing Widths : 

Comparing Widths You will use this for looking for things like: Atrioventricular blocks Aberrant beats Atrial premature contractions (APCs) Ventricular premature contractions (VPCs)

Axis-Wheel Ruler : 

Axis-Wheel Ruler Useful in calculating the true axis of waves and segments Back shows a representation of the hexaxial system Front shows red line and perpendicular line with an arrow

ECG Ruler : 

ECG Ruler Not needed if you have calipers Most have one side that measures rate, and a metric ruler on the other side

Straight Edge : 

Straight Edge Useful in: Evaluating baseline Determining if elevation or depression is present Best straight edges are clear with a line in the middle That way you can see whole area in question without obstruction

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