• Be 30 years of age or older
• Have symptoms of a heart attack such as chest pain or pressure, difficulty breathing, sweating or nausea
• Have positive findings for a heart attack on an electrocardiogram (ECG or EKG)
• The paramedic believes that based on their assessment, the patient is very likely having a heart attack or unstable angina.

A patient will not be enrolled if they meet any of the following conditions:

• Unconscious or unable to speak for themselves
• Unable or unwilling to comply with study
• Undergoing dialysis for kidney disease
• Lungs are congested with fluid
• A prisoner
• Known to be pregnant