Unstable angina and NSTEMI are at different ends of the spectrum of the same disease.  While there is no way to determine which patients presenting with unstable angina will ultimately progress to NSTEMI, the distinction between the two entities is clear.   Often, for patients presenting prior to the four hour window before cardiac biomarkers are positive (namely CK-MB), the EKG in context of the patient's chest pain will be marker for whether patient has STEMI versus UA/NSTEMI and needs to urgently undergo percutaneous revascularization.
Non ST elevation myocardial infarction pathophysiology
Papillary muscle rupture pathophysiology
Pericarditis in malignancy pathophysiology
Chronic stable angina prognosis
Spontaneous coronary artery dissection pathophysiology
Pulseless ventricular tachycardia pathophysiology
ST elevation myocardial infarction causes
Unstable angina / non ST elevation myocardial infarction epidemiology and demographics