Unstable angina (UA) is a type of angina pectoristhat is irregular. It is also classified as a type of acute coronary syndrome(ACS).
It can be difficult to distinguish unstable angina from non–Q-wave myocardial infarction.Unstable angina (UA) and non-ST elevation (non-Q wave) myocardial infarction (NSTEMI) differ primarily in whether the ischemia is severe enough to cause sufficient damage to the heart's muscular cells to release detectable quantities of a marker of injury (typically troponin T or troponin I). Unstable angina is considered to be present in patients with ischemic symptoms suggestive of an ACS and no elevation in troponin, with or without ECG changes indicative of ischemia (e.g., ST segment depression or transient elevation or new T wave inversion). Since an elevation in troponin may not be detectable for up to 12 hours after presentation, UA and NSTEMI are frequently indistinguishable at initial evaluation.
We researched this topic for you and found the following best online resources. They are categorized into basic, advanced, and research level based on the extent of information you need. You will be taken to the respective websites by pressing on the links below.
http://www.aafp.org/afp/2004/0801/p525.html unstable angina and non–st-segment elevation myocardial infarction: --part i. initial evaluation and management, and hospital care by stephen d. wiviott, m.d., and eugene braunwald, m.d., thrombolysis in myocardial infarction study group, brigham and women’s hospital, and harvard medical school, boston, massachusettsam fam physician. 2004 aug 1;70(3):525-532.
http://www.hindawi.com/journals/ecam/2013/948319/ xiaochen yang, xingjiang xiong, heran wang, guoyan yang, and jie wang, “xuesaitong soft capsule (chinese patent medicine) for the treatment of unstable angina pectoris: a meta-analysis and systematic review,” evidence-based complementary and alternative medicine, vol. 2013, article id 948319, 7 pages, 2013. doi:10.1155/2013/948319
http://www.hindawi.com/journals/ecam/2016/8617062/ suman cao, wenli zhao, huaien bu, ye zhao, and chunquan yu, “ligustrazine for the treatment of unstable angina: a meta-analysis of 16 randomized controlled trials,” evidence-based complementary and alternative medicine, vol. 2016, article id 8617062, 11 pages, 2016. doi:10.1155/2016/8617062
http://www.hindawi.com/journals/ecam/2013/673193/ chen mao, vincent c. h. chung, jin-qiu yuan, et al., “evaluation of the add-on effect of chinese patent medicine for patients with stable or unstable angina: a systematic review and meta-analysis,” evidence-based complementary and alternative medicine, vol. 2013, article id 673193, 15 pages, 2013. doi:10.1155/2013/673193
http://www.hindawi.com/journals/crp/2013/127270/ m. curial, e. nath, and e. lang, “novel antiplatelet agent use for acute coronary syndrome in the emergency department: a review,” cardiology research and practice, vol. 2013, article id 127270, 8 pages, 2013. doi:10.1155/2013/127270
http://www.hindawi.com/journals/ecam/2012/715790/ xuelan qiu, andrew miles, xuehua jiang, xin sun, and nan yang, “sulfotanshinone sodium injection for unstable angina pectoris: a systematic review of randomized controlled trials,” evidence-based complementary and alternative medicine, vol. 2012, article id 715790, 11 pages, 2012. doi:10.1155/2012/715790