Philips, Patient Monitoring

ST Map collects ST values and trends derived from the vertical (limb leads) and horizontal (chest leads) planes into an integrated display. The maps are multi-axis portraits of the patient’s ST segments as measured with the ST/AR algorithm. ST Map is available on all IntelliVue patient monitors with Release C software and higher.

The mind’s eye view provided by ST Map can help clinicians to recognize ST changes and their location in the heart more easily.

ST Map also offers trend views with intervals from 12 seconds to 30 minutes.

ST Maps can be used with conventional 12-lead, EASI derived 12-lead*, and standard 5-lead ECG placement. With a standard 5-lead placement, only the limb ST Map is displayed. ST Map reports can also be printed and added to the patient record.

Moreover, by setting a reference baseline, the clinician can easily see whether an intervention is having the desired effect. The baseline is displayed in yellow, while the current ST value color matches the ECG.

Although ST segment monitoring is not the most sensitive and specific technique for detecting myocardial ischemia, it is the only practical technique for continuous non-invasive monitoring of ischemic episodes. Continuous ST segment monitoring is clearly indicated in many areas:

Ruling out myocardial infarction
Evaluating patients with known or suspected coronary artery disease
Evaluating reperfusion after thrombolytic therapy
Evaluating post-MI ischemia
Evaluating reocclusion after angioplasty or atherectomy
Evaluating myocardial ischemia as the cause of respiratory failure
Evaluating intra- and post-operative ischemia for cardiac and high-risk surgical procedures

Since many conditions can cause ECG changes that mimic ischemia, clinicians must always interpret ST data in the context of other clinical information.

* EASI derived 12-lead ECGs and their measurements are approximations to conventional 12-lead ECGs and should not be used for diagnostic interpretations.