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Unstable angina is a signal that your arteries are becoming very narrow and that you could experience a heart attack. If left untreated, your unstable angina can lead to heart attack, heart failure, or arrhythmias (irregular heart rhythm). These can be life-threatening conditions.
With unstable angina and NSTEMI, the blockage is not (yet) complete. Clinically, NSTEMI is identical to unstable angina except for one thing. In NSTEMI, in contrast to unstable angina, the cardiac enzyme blood tests are abnormal, indicating that at least some actual cell damage is occurring to heart muscle cells.