This ruler is intended for use as an ongoing reference tool for healthcare professionals who participate in the management of cardiopulmonary arrest or other cardiovascular emergencies. This includes out-of-hospital healthcare providers, emergency department personnel, and other systems of care providers.
graphically defines ACS ECG findings for heart injury, ischemia, and infarction
gives directions on how to measure ST deviation with a transparent "window" grid
has 2 transparent grids calibrated to 25 mm/s paper
the "window" grid is placed over the ECG tracing to measure the ST segment at the appropriate time after the J point (0.04 second for ACS and 0.08 second for stress testing)
the interval grid is used to measure PR, QRS, and QT intervals
identifies infarct location with ECG graphics for specific leads for anterior, inferior, and lateral infarct
lists normal values for PR, QRS, and QTc intervals
has ruler markings to estimate heart rate, inch, and cm.