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Ischemic heart disease &
Angina pectoris
By
Onyedika
MD5
#671
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Content
Definition
Epidemiology
Pathogenesis (Acute plaque change, Inflammation,thrombus, vasoconstriction)
Angina pectoris
Myocardial infarctionChronic IHD
SCD
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Ischaemic heart disease
DefinitionAn imbalance between the supplyofoxygenandthe myocardialdemandresulting in myocardialischaemia.
Anginapectoris
symptom not a disease
chest discomfort associated with abnormalmyocardial function in the absence of myocardialnecrosis
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Determinants of myocardial
oxygen demandThe major determinants of myocardial oxygen
demand are heart rate, myocardial contractility,
and myocardial wall tension.
An adequate supply of oxygen to the myocardium
requires a satisfactory level of oxygen-carrying
capacity of the blood and an adequate level of
coronary blood flow.
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Epidemiology
Leading cause of death in US and industrialized
nations
Incidence rises progressively with increasing age.
M>F. Women are protected against MI duringtheir reproductive years
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Pathogenesis
Acute plaque change
Inflammation
Thrombus
Vasoconstriction
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Acute plaque changes
In most patients, unstable angina, infarction, andmany cases of SCD occur because of abrupt
plaque change followed by thrombosis, hence the
term acute coronary syndrome.
Vulnerable plaques
Plaques containing large a areas of foam cells and
extracellular lipid
Thin fibrous cap, contain few smooth muscle cells
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Role of Inflammation
Endothelial cells release CAMs, selectins
T-cells release TNF, IL-6, IFN-gamma tostimulate and activate endothelial cells and
macrophages
CRP predicts the risk of damage in coronary heart
disease
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Role of Thrombus
Total or partial vascular occlusion by a newly
formed thrombus on a disrupted
atherosclerotic plaque lead to unstableangina or sudden death.
Organizing thrombi produce potent activators
of smooth muscle proliferation, which can
contribute to the growth of atherosclerotic
lesions.
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Role of Vasoconstriction
Vasoconstriction directly compromises lumendiameter and potentiate plaque disruption.
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Classification s of IHD
Myocardial infarction (MI)
Sudden cardiac death
Angina pectoris
Chronic IHD with heart failure
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Angina Pectoris
Stable = 75% vessel block, transient ( 15 min.), not relived by rest, VD, Pre-infarctionAngina
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Microvascular Angina
(syndrome x)It may be due to spasm in the tiny blood
vessels of the heart, arms, and legs.
It is not characterized by arterial blockages,
so harder to diagnose but its prognosis is
excellent.
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Angina - Chest Pain
Site - Jaw to navel, retrosternal, left submammary
Radiation - Left chest, left arm, jaw, mandible,teeth, palate, back
Quality/severity - Tightness, heaviness,compressionclenched fists
Precipitating - physical exertion, cold windy
weather, emotion
Relieving factors -Rest, sublingual nitrates, aspirin
Autonomic symptoms - Sweating, pallor,
peripheral vasoconstriction.
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Chest Pain
Differential diagnosisCardiac pathology
Pericarditis, aortic dissection
Pulmonary pathology
Pulmonary embolus, pneumothorax, pneumonia
Gastrointestinal pathology
Peptic ulcer disease, reflux, pancreatitis, cafcoronary
Musculoskeletal pathology
Trauma, TietzesSyndrome
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Myocardial Infarction
It is necrosis of heart muscle resulting from ischemia.Chest pain
EKG ST-segment elevation (minutes to hours)
Q-wave and T-wave inversion (hours to days)
Lab. Evaluation: CK-MB gold standard,
Troponin- specific
CRP predicts risk of AMI in angina patients
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Chronic IHD
Also called ischemic cardiomyopathy
Patients - Post heart transplant receipts, previous
MI or CABG pts
Cause - Compromised ventricular function
Morphology - Vacuoles, Myocyte Hypertrophy
Diagnosis is by exclusion
Dr. Krishna Tadepalli, MD, www.mletips.com19
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Sudden cardiac death
It is unexpected death in one hour due to cardiac
causes with or without clinical symptoms
CauseAtherosclerosis ( 90%), others (10%)
Romano- Ward syndrome (KCNEgenes)
Long Q-T syndrome ( K+, Na+ channel
defects)
Mechanism- Most likely due to arrhythmias ( VF)
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Management
Pharmaceuticals:Beta Blockers
Ca++ Blockers
Nitrates - Vasculature vasodilationAnti-Hypercholesterolemia
HMG CoA Reductase Inhibitors
Antiplatelet MedicationClopidogrel (Plavix)
Aspirin
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Surgical Treatment
Stenting
Angioplasty (balloon)
Coronary Artery Bypass Graft
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Acute coronary syndrome
Syndrome Stenoses
Plaque
Disruption
Plaque-Associated
Thrombus
Stable angina >75% No NoUnstable
angina
Variable Frequent Non-occlusive
Transmural
MI
Variable Frequent Occlusive
Subendocard
ial MI
Variable Variable Widely variable
Sudden
death
severe Frequent Often small
Summary
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References
Kumar, V., & Robbins, S. L. 1. (2007). Robbins basic
pathology(8th ed.). Philadelphia, PA: Saunders/Elsevier.
P.Kumar and M.Clark: Kumar & Clarks Clinical Medicine
Lindenfeld J, et al. HFSA 2010 Comprehensive Heart FaailureGuidline.
Dr Chris Gale Clinical Research Fellow Medical Research Council -
University of Leeds
Dr.KrishnaTadepalli,MD. www.mletips.com
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