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Absolute contraindications are conditions where stress testing poses unacceptable risk. A myocardial infarction within the past 48 hours is an absolute contraindication due to the risk of arrhythmia, infarct extension, or sudden cardiac death. Other absolute contraindications include unstable angina, uncontrolled arrhythmias, symptomatic severe aortic stenosis, and acute myocarditis. Controlled hypertension, mild valvular disease, and diabetes are not absolute contraindications but require monitoring and precaution. Proper screening protects patient safety and aligns with American Heart Association guidelines for stress testing.

Syncope during stress testing indicates inadequate cerebral perfusion and is an absolute termination criterion. The test must be stopped immediately, patient placed in recovery, vitals monitored, and emergency support activated if needed. Continuing the test is unsafe. Documentation follows stabilization.

Baseline HR and BP provide a reference point to assess changes during exercise. Abnormal baseline values may also be contraindications for testing. They are not used for electrode placement or paper speed. Accurate baseline vitals ensure safe monitoring and valid interpretation of hemodynamic responses.

If the device disconnects, patients should reconnect leads if instructed, secure electrodes, and log the event in their diary. This allows the provider to interpret any artifacts. Ending the test wastes data, ignoring leads to missing information, and emergency calls are not necessary unless symptoms occur. Patient education ensures reliable results.

Lead II runs parallel to the heart’s electrical axis, producing prominent upright P waves and clear QRS/T complexes. This makes it ideal for rhythm interpretation. V1 helps evaluate atrial activity and bundle branch blocks. aVL and V6 are lateral leads useful for ischemia localization but not primary rhythm monitoring.