Straightedge

Straightedges are useful in evaluating the baseline and determining whether there is any elevation or depression present. You can use the ruler provided in this book or a piece of paper, even the ECG paper folded in on itself (without creasing the paper—messy ECGs are tough to read). The best straightedges are clear with a line in the middle so you can see the whole area in question without obstructing any of the complex. You can then use the straight line to evaluate the baseline. If you wish to create additional rulers, make a copy of the one in Figure 3-11 on overhead transparency film. Your neighborhood copy store should be able to accommodate you, preferably in color.

Figure 3-11 ECG straightedge.

© Jones & Bartlett Learning.

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