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Heart & Cardiometabolic HealthCoronary Health & Imaging

Coronary Artery Disease: Warning Signs, Risk Factors, and Medical Management

Coronary Artery Disease (CAD) is the leading cause of mortality globally, caused by atherosclerotic plaque build up in the epicardial coronary arteries. This section covers current diagnostic modalities such as coronary artery calcium scoring and CT coronary angiography plus current medical therapy including high intensity statins, beta blockers & ACE inhibitors. Indications for revascularisation are also discussed.

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Written by Dr. Naresh Trehan, MBBS, MD, FACSChairman & Chief Cardiac Surgeon, Medanta – The Medicity
Medically Reviewed by Dr. Rommel Tickoo, MBBS, MD✓ Verified
MBBS, MD (Internal Medicine)• Reviewed October 2026•Medical Review Board
Published: 2026-09-04Reviewed: October 2026Updated: 2026-11-03T09:55:00.700Z 10 min read 4820 Views
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Coronary Artery Disease: Warning Signs, Risk Factors, and Medical Management

Quick Summary & Key Findings

Diagnostic investigations include; ECG, Cardiac biomarkers (Troponin), Coronary CT angiography and Invasive Angiography. Treatment includes lifestyle optimisation, high intensity statin therapy, antiplatelets (Aspirin), BP control and interventions such as PCI with drug eluting stents or CABG if there is haemodynamically significant stenosis.

The biggest cause of sudden cardiac death and heart failure in cardiovascular medicine is Coronary Artery Disease (CAD). Atherosclerosis is a chronic low grade inflammatory pathology of the intimal artery layer.

ApoB containing lipoproteins pass through the endothelial micro-fissures are oxidized and cause macrophage influx leading to foam cells, fatty streaks and fibro-atheromatous plaques with necrotic lipid cores.

Identifying if a patient has stable angina (flow limiting stenosis upon exertion) or an acute coronary syndrome (plaque rupture leading to acute thrombotic occlusion) is vital to provide timely care.

Pathophysiology: Plaque Rupture vs. Stable Ischemia

Atherosclerosis occurs in stages: 1) Endothelial damage due to smoking, hypertension, hyperglycaemia and high levels of ApoB/LDL particles in the blood 2) Monocytes are recruited into the sub endothelium where oxidised LDL particles accumulate. Foam cells form and so inflammatory fatty streaks. 3) Smooth muscle cells lay down collagen to form a fibrous cap to prevent the necrotic core coming into contact with systemic circulation. 4) Matrix metalloprotease will cause degradation of the fibrous cap. The thrombogenic tissue factor is exposed to platelets in the circulation resulting in immediate clot formation. This leads to an acute myocardial infarction (STEMI or NSTEMI).
Coronary Artery Calcium (CAC) scoring via non-contrast CT accurately quantifies subclinical atherosclerotic plaque burden
High-Sensitivity C-Reactive Protein (hs-CRP) serves as an independent inflammatory biomarker of cardiovascular risk
Ischemia occurs when coronary luminal narrowing exceeds 70% during peak myocardial oxygen demand
Atypical symptoms (dyspnea, nausea, fatigue without chest pain) are common in women, diabetics, and the elderly

Diagnostic Modalities for Coronary Artery Disease

Diagnostic TestClinical PurposeSensitivity / SpecificityIdeal Patient Profile
Coronary Artery Calcium (CAC) ScanNon-contrast CT measuring calcified plaque volume (Agatston Score).High Sensitivity (~98%), Moderate SpecificityAsymptomatic intermediate-risk adults determining statin initiation.
Coronary CT Angiography (CCTA)Contrast CT imaging anatomy of coronary lumen and plaque morphology.Sensitivity 95–99%, Specificity 88–92%Symptomatic low-to-intermediate risk outpatients with chest pain.
Stress Echocardiogram / Nuclear SPECTEvaluates myocardial perfusion and inducible wall motion abnormalities under exertion.Sensitivity 80–88%, Specificity 75–85%Patients with exertional chest tightness or suspected exercise-induced ischemia.
Invasive Coronary Angiography (Cath)Gold standard catheterization for direct visualization and immediate PCI/stenting.Definitive Diagnostic & Interventional Gold StandardAcute coronary syndromes, STEMI/NSTEMI, or refractory severe angina.

Classic vs. Atypical Symptoms of Myocardial Ischemia

Recognize the diverse clinical presentations of heart disease:
Classic Angina Pectoris: Sub-sternal chest pressure, heaviness, squeezing, or burning ('an elephant sitting on the chest')
Radiation Patterns: Discomfort radiating to the left shoulder, inner arm, neck, lower jaw, or between the shoulder blades
Levine's Sign: Clenched fist held over the center of the chest during episodes of discomfort
Exertional Dyspnea: Unexplained shortness of breath provoked by walking upstairs and relieved by rest
Atypical Presentation: Diaphoresis (cold sweats), lightheadedness, sudden profound fatigue, or epigastric indigestion without chest pain
Clinical Advisory
Don’t try to drive to a hospital. If you or someone close to you has severe chest pain, sweat without any reason, feels dizzy, or is short of breath for more than 5 minutes call an ambulance. Take one 325mg adult strength aspirin if you can.

Atheromatous Plaque Biology, Coronary Calcium Agatston Scores & The ISCHEMIA Trial

Coronary Artery Disease (CAD) is caused by the chronic build-up of ApoB containing lipoproteins in the sub-endothelial space. This leads to macrophages being attracted to the area, causing them to transform into foam cells and produce chronic fibroatheromatous plaques in the epicardial coronary arteries. Stable angina will occur when there is >70% fixed stenosis of the vessel lumen, or >or >50% stenosis of the left main coronary artery. This causes an imbalance between oxygen supply and demand when the patient is physically or emotionally stressed. Acute Coronary Syndromes (ACS) often occur due to the acute rupture or surface erosion of non-obstructive high lipid, thin cap fibroatheroma (TCFA) plaques.
Coronary Artery Calcium (CAC) Agatston Scoring: CAC Score 0 (Very low (<1%) 10-year risk for ASCVD. Statins can often be safely avoided). CAC Score 1-99 (Slight plaque burden). CAC Score 100-399 (Moderate plaque. Definite indication for statins and lifestyle modification). CAC Score >=400 (High plaque burden. >20% 10-year event rate. Must be given high intensity statins. Consider functional stress imaging).
Landmark ISCHEMIA Trial Findings The ISCHEMIA trial demonstrated that an initial invasive strategy (cardiac catheterisation and stenting or CABG) for patients with stable coronary disease with moderate to severe ischemia on stress testing did not decrease major cardiovascular events or mortality from any cause when compared to an intensive medical conservative strategy after 5 years of follow up (published in NEJM n=5,179).
Coronary Computed Tomography Angiography (CCTA): The SCOT-HEART trial has established CCTA as the preferred imaging modality for diagnosing patients with stable chest pain. It allows direct visualisation of the anatomical features of both calcified and vulnerable non-calcified plaques and severity of stenosis using a non-invasive technique.
High Sensitivity Cardiac Troponin (hs-cTn): Rapid rule out or rule in Non-ST Elevation Myocardial Infarction (NSTEMI) can be performed quickly using serial measurements of High Sensitivity Cardiac Troponin with validated rapid diagnostic protocols (either 0/1h or 0/2h). This can be done by observing dynamic delta increases.

Guideline-Directed Medical Therapy (GDMT), Antiplatelet Protocols & CABG vs PCI

Long term secondary prevention in CAD requires aggressive medical stabilization of the whole coronary vasculature to prevent plaque progression and secondary thrombotic occlusion.
There are four pillars of CAD medical treatment – 1. Intensive statin use (atorvastatin 80mg or rosuvastatin 40mg) to achieve an LDL level of
Duration of Dual Antiplatelet Therapy (DAPT): After implantation of a drug eluting stent (DES), dual antiplatelet therapy with low-dose aspirin and potent P2Y12 inhibitors (ticagrelor 90mg twice daily or prasugrel 10mg once daily) should be continued for 12 months. Individualised DAPT can be determined based on the PRECISE-DAPT and DAPT scores. After 12 months antiplatelet therapy should be changed to single antiplatelet monotherapy.
Surgical CABG vs. Percutaneous PCI (SYNTAX Trial): Coronary Artery Bypass Grafting (CABG) is still better than PCI with stents for complex multi-vessel disease, high SYNTAX >22, diabetes and left main trunk stenosis. This results in significantly fewer long term revascularisations and deaths.
Cardiac Rehabilitation Sign up for comprehensive supervised out-patient cardiac rehab and reduce your risk of death from all causes by 26% and reduce your risk of hospital readmission by 31%. b

Myocardial Perfusion SPECT vs. Stress Echocardiography & Vulnerable Plaque Biology

Choice of non-invasive functional testing in coronary artery disease must take into account patients baseline ECG interpretation, functional capability and pre-test clinical likelihood. In patients who can exercise on a treadmill with normal ST segments at rest, a standard treadmill exercise test (ETT) can provide useful information about functional capacity and prognosis based on the Duke Treadmill Score. Patients with baseline LBBB, LVH or pre-excitation require advanced imaging.
Myocardial Perfusion Scintigraphy (SPECT/PET) – Patients are injected with a radioactive tracer (99mTc-sestamibi) at rest and peak exercise. Alternatively patients may be given a vasodilator drug (regadenoson). The presence of a reversible defect indicates inducible ischaemia. A fixed defect indicates previous cardiac scarring/infarction.
Stress Echocardiography The real time ultrasound assessment of segmental wall motion abnormalities. If there is not increased contraction in a segment of the myocardium or if new areas of hypo/akinesia occur during dobutamine administration or treadmill exercise then it will accurately diagnose epicardial coronary artery stenoses supplying that area.
High-Risk Vulnerable Plaque Morphology on CTA: Features of high-risk plaque on coronary CTA include low density plaque (d <30 Hounsfield Units representing a large necrotic lipid core), positive extra-luminal remodelling index (>1.1) and napkin ring sign (thin fibrous cap with central hypo-density).
Fractional Flow Reserve (FFR/FFR-CT): Determines whether the stenosis is hemodynamically significant. If FFR is ≤ 0.80 across the lesion it is deemed to be hemodynamically significant (causing ischemia) and revascularization should be performed.

Frequently Asked Questions

R
Clinical Reviewer License Verified

Dr. Rommel Tickoo, MBBS, MD

Director, Internal Medicine & Infectious Diseases, Max Super Speciality Hospital, Saket • MBBS, MD (Internal Medicine)
Medical Review Board

Dr. Rommel Tickoo is the Director of Internal Medicine at Max Super Speciality Hospital, Saket, New Delhi. With over 24 years of experience in adult primary care, infectious disease management, routine screenings, and fever diagnostics, he reviews mediguide4u preventive care and vaccination protocols.

License ID: DMC-12876
Director, Department of Internal Medicine, Max Super Speciality Hospital, Saket, New Delhi
Medically evaluated on October 2026View Dr. Profile, Verified Credentials & Articles

References & Clinical Resources

  1. Virani SS, Newby LK, Arnold SV, et al.. 2023 AHA/ACC/ACCP/ASPC/NLA/PCNA Guideline for the Management of Patients With Chronic Coronary Disease (2023). [Access Resource Link] — Circulation. 148(9):e9-e119
  2. Libby P, Theroux P. Coronary Atherosclerosis: Pathophysiology and Clinical Implications (2005). [Access Resource Link] — Circulation. 111(25):3481-3488
  3. Hoffmann U, Truong QA, Schoenfeld DA, et al.. Coronary Computed Tomography Angiography for the Evaluation of Patients with Acute Chest Pain (2012). [Access Resource Link] — New England Journal of Medicine. 367(4):299-308
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5.0 out of 5 (2 reviews)
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Marcus T., Cardiology PatientVerified Patient
•August 18, 2026

This guide broke down the exact diagnostic thresholds and medication pathways so clearly. My cardiologist recently discussed adjusting my regimen, and reading this helped me prepare specific questions for my follow-up visit.

Dr. Ashok Seth, MBBS, MD, FRCP, FACCInterventional Cardiologist & Medical Reviewer
August 19, 2026

Thank you for sharing, Marcus. Preparing targeted questions beforehand makes clinical consultations far more productive. Always discuss any dosage or timing adjustments directly with your attending physician.

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Patricia L., Nurse PractitionerHealthcare Professional
•August 29, 2026

The structured comparison tables and ACC/AHA clinical trial references are outstanding. I frequently print sections of this guide to explain lifestyle modifications to patients in our outpatient clinic.

Dr. Ashok Seth, MBBS, MD, FRCP, FACCInterventional Cardiologist & Medical Reviewer
August 30, 2026

We are honored to support your clinical practice, Patricia. Translating complex cardiovascular guidelines into patient-friendly education is the core mission of our editorial board.

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