When a patient presents to the emergency room with an acuteepisode of cardiac ischemia, the challenges for the physicianare to determine whether the patient is having a myocardialinfarction or has unstable angina and to determine the amountof myocardium at risk and the responsible coronary artery. Thatinformation will influence the decision to restore blood flowto the jeopardized area with thrombolytic agents or balloonangioplasty. In the acute phase of cardiac ischemia, the electrocardiogramis still the most important source of information to addressthese questions. Both the QRS complex and changes in the ST-Tsegment . . . [Full Text of this Article]
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