Elias B. Hanna

Practical Cardiovascular Medicine


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      1 * ACC defines DTB as the time from first medical contact (FMC) to first establishment of reperfusion with an interventional device; the preferred term is “FMC-to-device time.” FMC is the time of on-scene arrival of emergency medical service, or the time of hospital arrival in case the patient transports himself. First establishment of reperfusion corresponds to the first balloon inflation or thrombectomy that successfully re-establishes coronary flow. Note that the term DTB is not used in ESC guidelines: “STEMI diagnosis-to-wire crossing” is used instead.

        I. Causes of angina and pathophysiology of coronary flow

        II. Diagnostic approach

        III. Silent myocardial ischemia. Is there a role for screening asymptomatic patients and post-PCI patients?

        IV. Medical therapy: antiplatelet therapy

        V. Medical therapy: antianginal therapy and risk factor control

        VI. Indications for revascularization

        VII. CABG and CABG vs. medical therapy

        VIII. PCI and PCI vs medical therapy

        IX. PCI vs. CABG in multivessel and left main disease

        X. High-surgical-risk patients

        XI. Role of complete functional revascularization

        XII. Hybrid CABG–PCI

        XIII. Enhanced external counterpulsation (EECP)

        XIV. Mortality in CAD

        Appendix 1. Notes on various surgical grafts

        Appendix 2. Coronary vasospasm (variant angina, Prinzmetal angina)

        Appendix 3. Microvascular endothelial dysfunction

        Appendix 4. Women with chest pain and normal coronary arteries

        Appendix 5. Diagnostic strategy for ischemia with non-obstructed coronary arteries (INOCA)

        Appendix 6. Myocardial bridging

        Appendix 7. Coronary collaterals, chronic total occlusion

        Appendix 8. Hibernation, stunning, ischemic preconditioning

        Questions and answers

      A. Angina caused by fixed coronary obstruction

      Coronary blood flow constitutes ~5% of the total cardiac output and may increase up to 5 times with exercise. Normally, the coronary microcirculatory resistance constitutes the only resistance to myocardial flow; the epicardial vessels are just conductance vessels that offer no resistance to myocardial flow. In the presence of a functionally significant stenosis, classically a 70% diameter stenosis, the trans-stenotic flow drops during exertion; at a 90% diameter stenosis, the trans-stenotic flow drops at rest. During exercise or adenosine infusion, exten- sive microvascular dilatation occurs, requiring an extensive increase in flow to fill the dilated circulation;