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After assessing stability, EMS clinicians should categorize the ECG using a simple scheme. Using a traditional approach of separating dysrhythmias into dozens of categories is tempting but unneeded. In the field evaluation, assess stability and three ECG features: QRS complex rate, regularity, and duration.

ECG interpretation may occur in multiple different ways. They include EMS clinicians interpreting independently, with or without the aid of an integrated computerized interpretation, and medical oversight physicians who interpret transmitted tracings. Some errors are common. For example, EMS personnel misclassify QRS duration and rate in up to 20% to 30% of tachycardias [3]. Protocols and medical oversight decisions must assume that the potential for misclassification exists and attempt to minimize attendant adverse outcomes. The strategies outlined herein apply to both in‐field and transmitted interpretations. In all steps, one key step to ECG interpretation is using a printed strip and not a “guesstimate” from the monitor screen.