Abstract
Stable ischemic heart disease is a morbid clinical syndrome stemming from an imbalance between the metabolic demands of the myocardium and its oxygen supply. The resulting symptoms are brought about reliably by physical or emotional stress. The canonical symptom is classic angina, but clinical presentation can vary greatly among patients (see Chap. 1). Outpatient management is focused on both reduction in adverse cardiovascular events and relief of symptoms.
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Keywords
Diagnosis and Clinical Assessment
Key Definitions
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Coronary artery disease (CAD): any atheromatous plaque in the coronary arteries, regardless of effect on blood flow.
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Stable ischemic heart disease (SIHD): a clinical syndrome marked by stable symptoms. Symptoms are usually angina: pain or pressure brought on reliably by exertion or emotion and relieved by rest or nitroglycerine.
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CAD is one possible cause of SIHD.
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Unstable angina (UA): the symptomatic manifestation of an acute coronary syndrome (ACS).
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These symptoms (possibly similar to SIHD) are either brought on with less provocation or with no provocation at all, i.e., at rest.
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ACS results from an acute imbalance in myocardial oxygen supply and demand, often from an acute reduction in coronary blood flow.
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ACS ranges from UA alone to myocardial infarction (MI).
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ACS requires inpatient management.
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Clinical Pearl: Do not confuse a new diagnosis of SIHD with ACS!
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The first presentation of “new” angina does not necessarily mean it is unstable.
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History
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Whether seeing a patient with SIHD for the first time or in follow-up, establish details of their symptoms.
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What symptoms do they typically experience (typical angina, dyspnea, or other atypical symptoms)?
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What level of stress elicits their symptoms?
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What do they do when they experience those symptoms (rest, take nitroglycerin, etc.)?
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Have the symptoms changed or evolved? Evolution of symptoms should prompt additional workup and management.
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Assess other vascular beds.
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Claudication
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Transient neurologic symptoms
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Watch for new red flag symptoms.
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Previous or new anginal symptoms now occurring at rest
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Syncope/periodic dizziness/palpitations suggesting arrhythmia
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New lower extremity edema
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Physical Exam
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The physical examination is often normal or nonspecific in patients with SIHD, but it is useful to look for other associated findings that suggest non-coronary atherosclerotic vascular disease [1].
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New or worsening symptoms should prompt more detailed examination:
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Syncope → auscultation of new murmurs
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Claudication → peripheral pulses/ankle-brachial index
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Neurologic symptoms → Neuro exam
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Lower extremity edema → jugular venous pulsation, point of maximal impulse, auscultation for S3, lung auscultation for rales
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Routine Workup in SIHD
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Labs
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Lab work in SIHD focuses on comorbidities: CBC, CMP, lipid panel, HbA1c, BNP, and baseline CK especially upon diagnosis of CAD.
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If symptoms are progressing, consider repeating lab work.
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Electrocardiogram
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Rest echocardiography
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Not needed routinely
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Consider if:
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Heart failure/valvular disease signs/symptoms
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Known prior MI or a pathologic Q-wave on the ECG
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Evidence of ventricular arrhythmias, suggesting underlying cardiomyopathy [2]
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Advanced Noninvasive Testing: Who and when to Test
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Outpatient noninvasive testing is typically indicated in two groups:
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Patients with new symptoms suspicious for SIHD.
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Patients with known SIHD who have new or worsening symptoms.
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As above, new SIHD and ACS are distinct clinical syndromes – new SIHD can be assessed with outpatient testing, whereas ACS requires inpatient management.
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Noninvasive testing can identify patients with CAD and estimate prognosis.
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Most valuable when cause of new chest pain is truly uncertain (i.e., pretest probability 20–80%).
Types of Testing
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Stress (functional) testing (see Table 13.2).
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Most common form of noninvasive testing.
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Select the stressor.
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Exercise
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Pharmacologic
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Select the modality to assess ischemia.
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ECG
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Echocardiography
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Single-photon emission computed tomography [SPECT]
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And less often, positron emission tomography [PET] or cardiac MRI [CMR]
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Anatomical testing with coronary computed tomography angiography (CCTA)
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Increasingly utilized for evaluation of chest pain.
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The European Society of Cardiology and the National Institute for Health and Care Excellence in the United Kingdom recommend CCTA as the initial test for the evaluation of chest pain in patients without known CAD [5, 6].
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Key advantages:
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High negative predictive value (avoids unnecessary cardiac catheterization)
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Identifies nonobstructive coronary disease and coronary congenital anomalies
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Does not require exercise
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Recent key trials:
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PROMISE, NEJM 2015 – CCTA compared to functional testing as the initial diagnostic test among intermediate-risk patients with symptomatic SIHD: no difference in adverse cardiovascular events [7].
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SCOT-HEART, NEJM 2018 – CCTA + standard care in SIHD = lowered rates of combined primary endpoint of death from CHD or non-fatal MI [8].
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Invasive coronary angiography.
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Not typically indicated for initial evaluation of SIHD.
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In patients with very high likelihood of disease (i.e., >90%), noninvasive testing provides little additional information, so angiography is used when it will affect therapy.
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Test Selection Pearls
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In intermediate-risk patients that can exercise and have an interpretable ECG (Fig. 13.3), exercise with ECG alone carries a Class IA indication [2].
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Sensitivity of exercise without imaging is limited at 61% (i.e., 39% false-negative rate) and worse for women [2].
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Clinical Pearl: In practice, it is often preferred to add imaging to exercise to improve sensitivity. Use of imaging for this indication carries a Class IIa indication in the guidelines [2].
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It is essential to add imaging if the ECG is uninterpretable.
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CCTA is an appropriate first-line test for the evaluation of chest pain among patients at intermediate pretest probability regardless of the ability to exercise [9].
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Pharmacologic stress with imaging can be used for patients who [1] cannot exercise or [2] cannot exercise strenuously enough to generate a valid test result.
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For echocardiography and MRI, dobutamine is used as stressor.
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For SPECT and PET, vasodilators (regadenoson or dipyridamole).
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To choose between imaging modalities, consider the resources and technical expertise at your institution [2].
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Echocardiography has no radiation and provides information on valvular function and filling pressures.
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Clinical Pearl: In patients with left bundle branch block or ventricular pacing, avoid stress echo.
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The abnormal electrical activation of the heart impairs evaluation of ischemia in the interventricular septum (LAD territory).
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CCTA, SPECT, or PET imaging are less susceptible to poor image quality related to body habitus.
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When CAD/SIHD is already known, evolving or ongoing symptoms on anti-anginal therapy are ideally assessed by functional testing with imaging to localize and quantify ischemia to inform decisions on revascularization [10].
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CCTA/non-functional imaging is less valuable in this setting.
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SIHD Without Obstructive CAD
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Approximately 30% of patients presenting with angina have no obstructive CAD.
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Angina without obstructive coronary disease is more common among women [11].
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Risk of ischemic events is still increased, and medical therapy is still indicated [12, 13]!
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CCTA is the best test for diagnosing nonobstructive CAD.
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Among patients with angina and nonobstructive CAD, 50–65% are believed to have coronary microvascular dysfunction.
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Assessment of microvascular function can be done with CMR and PET perfusion [14].
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When to Refer to a Cardiologist
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When testing approach is unclear
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Uncertain diagnosis after noninvasive testing, to consider coronary angiography [10]
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Suspected microvascular dysfunction or variant (Prinzmetal’s) angina
Treatment
Goals of Treatment
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Prevention of ischemic events (cerebral, coronary, and peripheral) (Fig. 13.4).
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Reducing anginal symptoms.
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These goals are independent!
Behavior Modification
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Smoking cessation: Smoking increases cardiovascular disease mortality by 50%.
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Physical activity: Current guidelines recommend 150 minutes of at least moderate activity or 75 minutes of vigorous activity per week [15]. Patients with SIHD and those post-MI should participate in a cardiac rehabilitation program [2].
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Dietary modification: Emphasize intake of vegetables, fruits, whole grains, legumes, healthy protein sources (low-fat dairy, low-fat poultry, fish/seafood, and nuts), and non-tropical vegetable oils. The intake of sweets, sugar-sweetened beverages, and red meats should be limited [16].
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Alcohol moderation: One drink per day, no harm and possible benefit; beyond two drinks per day, no benefit and likely harm [17]. Heavy drinking worsens hypertension and may precipitate ischemia in SIHD and should be avoided [18].
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Psychological well-being: Interventions to reduce psychological stress may improve clinical outcomes in patients with SIHD [19].
Pharmacologic Therapy for Specific Risk Factors/Comorbidities
Lipids
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HMG-COA reductase inhibitors (statins) are the mainstay of lipid management.
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In SIHD patients: < 75 years, high potency statin (atorvastatin 80 mg or rosuvastatin 20–40 mg) is recommended; >75 years reasonable to reduce potency.
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Target LDL-C < 70 mg/dL with addition of ezetimibe and PCKS9 inhibitors in sequence in patients at high risk [16]. High risk = multiple previous CV events or CV event + multiple risk factors.
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Niacin is no longer recommended for the lowering of LDL-C [16].
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Fish oil: Over-the-counter formulations have not shown consistent benefit [20], but icosapent ethyl reduced cardiovascular events 25% on top of high-dose statins and aspirin in patients with SIHD and elevated triglycerides (REDUCE-IT, NEJM 2019) [21].
Hypertension
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Guidelines: goal BP of <130/80 mmHg in SIHD [22].
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Recent trial: SPRINT, NEJM 2015 – in SIHD patients over 50, targeting lower BP (121 vs 136 mmHg) decreased CV events by 31%, NNT = 44 [23].
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Agent of choice depends on comorbidities and other targets (i.e., angina, congestive heart failure, chronic kidney disease, or diabetes).
Diabetes
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For SIHD patients with HbA1c still >6.5–7%, consider SGLT2 inhibitors (e.g., empagliflozin, canagliflozin, dapagliflozin) and/or GLP-1 receptor agonists (e.g., liraglutide, semaglutide). Both have been shown to reduce CV events [24].
Obesity
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Lifestyle change is critical.
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If BMI >35, consider weight loss surgery.
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In patients with type 2 diabetes, Roux-en-Y gastric bypass has been shown to reduce CV events [26].
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Pharmacologic Therapy to Prevent MI or Death in SIHD Independent of Risk Factors
Antiplatelet Therapy
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If any atherosclerotic cardiovascular disease (CAD, SIHD, peripheral arterial disease, etc.), treat with medium-dose aspirin, usually 81 mg [15].
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When aspirin is contraindicated (e.g., allergy), patients can be treated with clopidogrel 75 mg daily.
Anticoagulation
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Anticoagulation reduces ischemic events but raises bleeding events! Consider risk/benefit with a cardiologist.
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Recent trial: COMPASS, NEJM 2017 – Rivaroxaban at a very reduced dose of 2.5 mg twice daily reduced cardiovascular mortality in SIHD at the expense of increased bleeding [27].
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Anti-inflammatory Therapy
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Colchicine 0.5 mg daily was shown in the LoDoCo2 trial (NEJM 2020) to reduce cardiovascular events in patients with chronic coronary disease [28].
Other Therapies
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Patients with SIHD should receive an annual influenza vaccine [2, 29].
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Patients with SIHD are at increased risk for complications from SARS-CoV-2 and vaccination is recommended [30].
Medications that Treat Angina
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β-Blockers,
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Initial therapy for prolonged relief of symptoms. Typically start here!
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Clinical Pearl: All beta-blockers reduce symptoms, though in patients with peripheral arterial disease, drugs with additional alpha blockade, such as carvedilol or labetalol, may prevent vasoconstriction mediated by unopposed alpha agonism [2].
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In patients with reduced EF, carvedilol, metoprolol succinate, and bisoprolol should be favored per guidelines [31].
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Contraindicated in severe bronchospastic lung disease.
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Calcium channel blockers
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Amlodipine: the preferred option, a dihydropyridine calcium channel blocker
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Diltiazem and verapamil: non-dihydropyridine calcium channel blockers
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Useful if beta-blockers produce side effects
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Should be avoided in patients with reduced ejection fraction given their negative inotropic effects
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Nitrates
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Short-acting nitrates : in the form of sublingual nitroglycerin or nitroglycerin spray are ideal for immediate relief of angina.
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Patients can administer one dose every 5 minutes for up to three doses.
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Long-acting nitrates :
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Three times daily isosorbide dinitrate
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Once (sometimes twice) daily isosorbide mononitrate
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Nitropaste
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Warn patients about the interaction between nitrates and PDE5 inhibitors leading to hypotension.
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Ranolazine is an anti-anginal that appears to reduce angina through its effect on the late sodium current.
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It prolongs QTc and therefore should be used with caution if a patient is on other QT-prolonging medications.
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Side effects are primarily GI upset.
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Usually a fourth-line agent.
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Revascularization in SIHD
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Revascularization (either by PCI or CABG) is indicated in patients with ischemic symptoms that are progressive or refractory to maximal medical management (Class 1A recommendation) [2].
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In the ISCHEMIA trial (NEJM 2020), revascularization did not reduce ischemic cardiovascular events or death in SIHD patients with moderate or severe ischemia. However revascularization did improve symptoms.
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Based on observational data, treatment of symptomatic patients with proximal left anterior descending artery disease or multivessel disease with an initial strategy of revascularization plus GDMT may be considered [32, 33]. Discuss with a cardiologist.
Key Learning Points
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In patients presenting with new symptoms: differentiate new SIHD and ACS, and consider baseline risk based on demographics and comorbidities.
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Consider noninvasive functional (exercise or pharmacologic stress test with ECG, echo, or nuclear imaging) or anatomic (CCTA) assessment for CAD in patients with new SIHD evaluation. CCTA is increasingly being recommended as a first-line test.
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The goals of treatment are to minimize adverse cardiovascular outcomes and death and reduce symptoms. These goals are often achieved with different pharmacotherapy. Therapy should be guideline based.
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Consider angiography/revascularization in conjunction with a cardiologist, particularly for patients with severe proximal disease when there are persistent symptoms despite GDMT.
Adapted with permission from Ref. [3]
Abbreviations
- ACS:
-
Acute coronary syndrome
- BMI:
-
Body mass index
- BNP:
-
B-type natriuretic peptide
- BP:
-
Blood pressure
- CABG:
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Coronary artery bypass graft
- CAD:
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Coronary artery disease
- CBC:
-
Complete blood count
- CCTA:
-
Coronary computed tomography angiography
- CK:
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Creatinine kinase
- CMP:
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Complete metabolic panel
- CMR:
-
Cardiac magnetic resonance imaging
- CV:
-
Cardiovascular
- ECG:
-
Electrocardiogram
- EF:
-
Ejection fraction
- GDMT:
-
Guideline directed medical therapy
- GI:
-
Gastrointestinal
- HbA1c:
-
Hemoglobin A1c
- HMG-CoA:
-
3-hydroxy-3-methyl-glutaryl-CoA reductase
- LDL-C:
-
Low density lipoprotein cholesterol
- MI:
-
Myocardial infarction
- NEJM:
-
New England Journal of Medicine
- NNT:
-
Number needed to treat
- PCI:
-
Percutaneous Coronary Intervention
- PCSK9:
-
Proprotein convertase subtilisin/kexin type 9
- PDE5:
-
Phosphodiesterase type 5
- SARS-Cov-2:
-
Severe acute respiratory syndrome coronavirus 2
- SGLT2:
-
Sodium-glucose co-transporter-2
- SIHD:
-
Stable ischemic heart disease
- SPECT:
-
Single photon Emission Computed Tomography
- UA:
-
Unstable angina
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Katz, D., Gavin, M.C. (2022). Stable Ischemic Heart Disease. In: Bhargava, A.A., Wells, B.J., Quintero, P.A. (eds) Handbook of Outpatient Cardiology . Springer, Cham. https://doi.org/10.1007/978-3-030-88953-1_13
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