Ischemic Heart Disease Chapter 17

1
Ischemic Heart DiseaseChapter 17
Pharmacotherapy A Pathophysiologic Approach
The McGraw-Hill Companies
2
Abbreviations

• ACC American College of Cardiology
• ACEI angiotensin-converting enzyme inhibitor
• ACIP Asymptomatic Cardiac Ischemia Pilot
• AHA American Heart Association
• AV arteriovenous
• CABG coronary artery bypass grafting
• CAD coronary artery disease
• CASS Coronary Artery Surgery Study
• CHD coronary heart disease
• CT computed tomography
• CVD cardiovascular disease

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Abbreviations

• DCA directional coronary atherectomy
• ECG electrocardiogram
• EDRF endothelium-derived relaxing factor
• ETT exercise tolerance (stress) testing
• GMP guanosine monophosphate
• HDL high-density lipoprotein
• HERS Heart Estrogen/Progestin Replacement Study
• IHD ischemic heart disease
• I Na late sodium current
• ISDN isosorbide dinitrate
• ISMN isosorbide mononitrate

4
Abbreviations

• LAD left anterior descending
• LDL low-density lipoprotein
• LV left ventricle
• MI myocardial infarction
• MVO2 myocardial oxygen demand
• PCI primary coronary intervention
• PTCA percutaneous transluminal angioplasty
• R1 resistance 1-large epicardial or surface
  vessels
• R2 resistance 2-intramyocardial arteries and
  arterioles

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Key Concepts

• Ischemic heart disease (IHD) caused by coronary
  atherosclerotic plaque formation which leads to
  imbalance between O2 supply demand
• results in myocardial ischemia
• Chest pain cardinal symptom of myocardial
  ischemia caused by coronary artery disease (CAD)
• Risk factor identification/modification important
  interventions for patients with known/suspected
  IHD

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Key Concepts

• Major risk factors that can be altered
• dyslipidemia
• high total low-density lipoprotein cholesterol
• low high-density lipoprotein cholesterol
• high triglycerides
• smoking
• glycemic control in DM
• HTN
• therapeutic lifestyle changes
• exercise, weight reduction, reduced dietary
  cholesterol
• reduction in inflammation may play an important
  role

7
Key Concepts

• Most CAD patients should receive antiplatelet
  therapy
• Manage chronic stable angina patients initially
  with ß-blockers for symptomatic control
• at least as well as nitrates or CCBs
• decrease risk of recurrent MI, CAD mortality
• Nitroglycerin, other nitrate products useful for
  angina prophylaxis when patients undertake
  activities known to provoke angina
• When angina occurs on a regular, routine basis
• institute chronic prophylactic therapy

8
Key Concepts

• CCBs effective monotherapy
• generally used with ß-blockers or as monotherapy
  for patients intolerant to ß-blockers
• most patients with moderate to severe angina
  require 2 drugs to control symptoms
• ranolazine 2nd line drug
• used with ß-blockers CCBs

9
Key Concepts

• Pharmacologic management as effective as
  revascularization if 1 or 2 vessels involved
• no differences in survival
• recurrent MI
• other measures of effectiveness
• Multivessel involvement best managed with
  revascularization
• left main coronary artery disease
• left main equivalent disease
• 2- to 4-vessel involvement with significant left
  ventricular dysfunction

10
Key Concepts

• Revascularization
• percutaneous transluminal coronary angioplasty
• coronary artery bypass graft (CABG)
• certain patients (e.g. diabetics) should have
  CABG
• Percutaneous transluminal coronary angioplasty
  CABG produce similar results

11
Key Concepts

• Clinical performance measures for chronic stable
  CAD
• American College of Cardiology, American Heart
  Association

• BP
• lipid profile
• drug therapy hyperlipidemia
• symptom activity assessment

• smoking cessation
• antiplatelet therapy
• ß-blocker therapy for prior myocardial infarction
• ACE inhibitor therapy
• diabetes screening

12
Ischemic Heart Disease

• Caused by epicardial vessel atherosclerosis which
  leads to coronary heart disease
• Presentation
• acute coronary syndrome
• chronic stable exertional angina pectoris
• ischemia without clinical symptoms
• heart failure, arrhythmias
• cerebrovascular disease
• peripheral vascular disease

13
Epidemiology

• 79 million American adults gt 1 type of
  cardiovascular disease (CVD)
• 2,400 Americans die of CVD each day
• average of 1 death every 33 seconds
• In 2004, CHD was responsible for 52 of CVD
  deaths
• Common initial presentation
• women angina
• men myocardial infarction

Rosamond W, Flegal K, Friday G, et al. Heart
disease and stroke statistics2007 update A
report from the American Heart Association
Statistics Committee and Stroke Statistics
Subcommittee. Circulation 200711569171.
14
Criteria for Determination of the Specific
Activity Scale Functional Class
MET, metabolic equivalents of activity.
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
15
Criteria for Determination of the Specific
Activity Scale Functional Class
MET, metabolic equivalents of activity.
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
16
Angina

• Classified by symptom severity, disability,
  specific activity scale
• Number of vessels obstructed important
  determinate of outcome
• Risk factors for increased mortality
• heart failure
• smoking
• left main or left main equivalent CAD
• diabetes
• prior MI

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Grading of Angina Pectoris by the Canadian
Cardiovascular Society Classification System
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
18
Etiology/Pathophysiology

• Coronary atherosclerotic plaque formation leads
  to imbalance between O2 supply demand ?
  myocardial ischemia
• Ischemia lack of O2, decreased or no blood flow
  in myocardium
• Anoxia absence of O2 to myocardium

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Etiology/Pathophysiology

• Determinants of myocardial oxygen demand (MVO2)
• HR
• contractility
• intramyocardial wall tension during systole (most
  important)
• Determinants of ischemia
• resistance in vessels delivering blood to
  myocardium
• MVO2

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Etiology/Pathophysiology

• Coronary blood flow
• inversely related to arteriolar resistance
• directly related to coronary driving pressure
• Extent of functional obstruction important
  limitation of coronary blood flow
• severe stenosis (gt 70)
• ischemia symptoms at rest

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Etiology/Pathophysiology

• Changes in O2 balance lead to rapid changes in
  coronary blood flow
• Mediators that affect O2 balance
• adenosine
• other nucleotides
• nitric oxide
• prostaglandins
• CO2
• H

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Etiology/Pathophysiology

• Extrinsic factors
• alterations in intramyocardial wall tension
  throughout the cardiac cycle
• phasic systolic vascular bed compression
• factors that favor reduction in blood flow
• Intrinsic factors
• myogenic control
• Bayliss effect
• neural components
• parasympathetic nervous system, sympathetic
  nervoussystem, coronary reflexes

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24
Etiology/Pathophysiology

• Factors limiting coronary perfusion
• coronary reserve diminished at 85 obstruction
• critical stenosis occurs when obstructing lesion
  encroaches on the luminal diameter exceeds 70

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25
Short-Term Risk of Death or Nonfatal Myocardial
Infarction in Patients with Unstable Angina
CABG, coronary artery bypass grafting CAD,
coronary artery disease CCS, Canadian
Cardiovascular Society ECG, electrocardiogram
Ml, myocardial infarction MR, mitral
regurgitation Tnl, troponin TnT, troponin T.
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
26
Clinical Presentation of Angina

• Many ischemia episodes are silent (no symptoms)
• Patients often have reproducible pattern, pain,
  other symptoms
• Increased frequency, severity, duration, symptoms
  at rest suggests unstable angina

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Clinical Presentation of Angina

• Symptoms
• sensation of pressure/burning over or near
  sternum often but not always radiating
• left jaw, shoulder, arm
• chest tightness, shortness of breath
• visceral pain lasts 0.5 to 30 min
• precipitating factors exercise, cold
  environment, walking after a meal, emotional
  upset, fright, anger, coitus
• relief with rest, nitroglycerin

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Clinical Presentation of Angina

• Signs
• abnormal precordial systolic bulge
• abnormal heart sounds
• Typically no abnormal laboratory tests
• Likely to have abnormal tests for IHD risk
  factors
• History of chest pain

29
Differential Diagnosis of Episodic Chest Pain
Resembling Angina Pectoris
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
30
Differential Diagnosis of Episodic Chest Pain
Resembling Angina Pectoris
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
31
Cardiac Findings in CAD Patients
CHF, congestive heart failure MI, myocardial
infarction S1, first heart sound S2, second
heart sound S3, third heart sound S4, fourth
heart sound
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
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Diagnostic Tests

• Electrocardiogram (ECG)
• normal in ½ of patients with angina not
  experiencing an acute attack
• ST-T wave changes
• depression
• T-wave inversion
• ST-segment elevation
• significant ischemia
• ST-segment depression gt 2 mm
• exertional hypotension
• reduced exercise tolerance

34
Lead V4 at rest (top) and after 4½ min of
exercise (bottom). There is 3 mm (0.3 mV) of
horizontal ST-segment depression, indicating a
positive test for ischemia.
35
Diagnostic Tests

• Exercise Tolerance Testing (ETT)
• recommended for patients with intermediate
  pretest probability of CAD based on age, gender,
  symptoms
• insensitive for predicting coronary artery
  anatomy but correlates well with outcome
• Echocardiography
• useful if physical examination suggests valvular,
  pericardial disease, ventricular dysfunction

36
45-year-old avid jogger who began experiencing
classic substernal chest pressure underwent an
exercise echo study. With exercise the patient's
heart rate increased from 52 to 153 bpm. The left
ventricular chamber dilated with exercise, and
the septal and apical portions became akinetic to
dyskinetic (red arrow). These findings are
strongly suggestive of a significant flow
limiting stenosis in the proximal left anterior
descending coronary artery, which was confirmed
at coronary angiography.
37
Diagnostic Tests

• Cardiac imaging
• radionucleotide angiocardiography
• technetium pyrophosphate scans
• positron emission tomography
• ultrarapid computerized tomography
• spiral CT
• ultrafast CT
• electron-beam CT
• Cardiac catheterization angiography

38
Stress and rest myocardial perfusion PET images
obtained with rubidium-82 in a patient with chest
pain on exertion. The images demonstrate a large
and severe stress perfusion defect involving the
mid and apical anterior, anterolateral, and
anteroseptal walls, and the LV apex, showing
complete reversibility, consistent with extensive
and severe ischemia in the mid left anterior
descending coronary artery territory (red
arrows).
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IHD Treatment

• Short term goals
• reduce/prevent angina symptoms that limit
  exercise capability impair quality of life
  (QOL)
• Long-term goals
• prevent CHD events
• MI
• arrhythmias
• heart failure
• extend the patients life

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IHD Treatment

• Risk factor identification/modification
• risk factors play a major role in determining
  occurrence severity of IHD
• risk factors are additive
• classified as alterable or unalterable

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IHD Treatment

• Unalterable risk factors
• gender
• age
• family history
• environmental influences
• climate, air pollution, trace metals in drinking
  water
• diabetes mellitus

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IHD Treatment

• Alterable risk factors
• smoking
• HTN
• hyperlipidemia
• obesity, sedentary lifestyle
• hyperuricemia
• psychosocial factors (stress, type A behavior)
• medications
• progestins
• corticosteroids
• cyclosporine

46
The American College of Cardiology and American
Heart Association Evidence Grading System
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
47
Stable Exertional Angina Pectoris

• ASA (Class I, Level A)
• ß-blockers with prior MI (Class I, Level A)
• ACE inhibitors for patients with CAD diabetes
  or LV systolic dysfunction (Class I, Level A)
• LDL-lowering therapy with CAD LDL gt 130 mg/dL
  (Class I, Level A)
• target LDL lt 100 mg/dL
• lt 70 mg/dL in patients with CHD multiple risk
  factors
• Sublingual nitroglycerin for immediate angina
  relief (Class I, Level B)

48
Stable Exertional Angina Pectoris

• Calcium antagonists or long-acting nitrates for
  symptom reduction when ß-blockers contraindicated
  (Class I, Level B)
• Calcium antagonists or long-acting nitrates in
  combination with ß-blockers when initial
  ß-blocker treatment is inadequate (Class I, Level
  C)
• Calcium antagonists or long-acting nitrates as
  substitutes for ß-blockers if initial ß-blocker
  treatment leads to intolerable side effects
  (Class I, Level A)

49
Stable Exertional Angina Pectoris

• May substitute clopidogrel when ASA
  contraindicated (Class IIa, Level B)
• Use of long-acting nondihydropyridine calcium
  antagonists instead of ß-blockers as initial
  therapy (Class IIa, Level B)
• Therapies to avoid
• dipyridamole (Class III, Level B)
• chelation therapy (Class III, Level B)

50
Effect of Drug Therapy on Myocardial O2 Demand
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
51
Stable Exertional Angina Pectoris

• ß-blocker place in therapy
• effective in chronic exertional angina as
  monotherapy and in combo with nitrates and/or
  CCBs
• 1st line in chronic angina that requires daily
  maintenance therapy
• ideal candidates
• physical activity figures prominently in anginal
  attacks
• coexistent hypertension
• history of supraventricular arrhythmias or
  post-MI angina
• anxiety associated with angina

52
Stable Exertional Angina Pectoris

• ß-blockers
• symptom control
• reduce risk of recurrent MI, CAD mortality
• may be used for chronic prophylaxis in patients
  with gt 1 angina episodes/day
• smokers have reduced anti-anginal efficacy
• some have reduced efficacy based on lipid
  solubility
• propranolol lipid soluble, inducible metabolism

53
Stable Exertional Angina Pectoris

• ß-blockers
• overall effect of ß-blockers in patients with
  effort-induced angina ? reduction in O2 demand
• do not improve O2 supply
• can blunt reflex tachycardia from nitrate therapy
• may decrease exercise capacity in healthy
  individuals or those with HTN
• may improve exercise tolerance in angina patients

54
Stable Exertional Angina Pectoris

• ß-blockers
• dosing based on t½
• disparity between t½ duration of action for
  several BBs
• renal/hepatic dysfunction affect disposition
• route of elimination not major consideration in
  drug selection

55
Stable Exertional Angina Pectoris

• ß-blocker adverse effects
• abrupt withdrawal associated with increased
  severity number of pain episodes myocardial
  infarction
• pharmacologic effects
• CNS effects
• fatigue
• malaise
• depression

• hypotension
• decompensated heart failure
• bradycardia

• heart block
• bronchospasm
• altered glucose metabolism

56
Stable Exertional Angina Pectoris

• Nitrate place in therapy
• terminate acute anginal attack
• prevent effort/stress-induced attacks
• long-term prophylaxis
• usually in combination with ß-blockers or CCBs
• formulations

• chewable
• oral
• transdermal

• ointments
• spray
• IV

57
Stable Exertional Angina Pectoris

• Nitrate therapy for acute attacks
• sublingual
• buccal
• spray products
• Symptom prophylaxis when undertaking activities
  that precipitate attacks
• oral or transdermal products
• 0.3 to 0.4 mg SL 5 min prior to activity
• Chronic prophylaxis with long-acting forms
• tolerance limiting factor

58
Stable Exertional Angina Pectoris

• Nitrate therapy
• reduces MVO2 2? to venodilation
  arterial-arteriolar dilation ? reduction in wall
  stress from reduced ventricular volume pressure
• systemic venodilation increases flow to deep
  myocardial tissue
• dilation of large small intramural coronary
  arteries, collateral dilation, coronary artery
  stenosis dilation, abolition of normal tone in
  narrowed vessels, relief of spasms

59
Stable Exertional Angina Pectoris

• Nitrate therapy
• large 1st-pass effect
• short t½ (except isosorbide mononitrate)
• see Nitrate Products chart on slide 61
• large volume of distribution
• high clearance rates
• large interindividual variation in plasma/blood
  concentrations
• saturable metabolism
• accumulation of metabolites with multiple doses
• drug adsorption to PVC tubing, syringes

60
Stable Exertional Angina Pectoris

• Nitrate therapy adverse effects
• extension of pharmacologic effects
• postural hypotension with CNS symptoms,
  headaches, flushing 2? to vasodilation
• occasional nausea from smooth muscle relaxation
• reflex tachycardia, but bradycardia has been
  reported
• rash with all products (particularly with
  patches)
• production of methemoglobinemia with high doses
  for extended periods
• measurable ethanol propylene glycol
  concentrations with IV nitroglycerin
• tolerance

61
Nitrate Products
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
62
Stable Exertional Angina Pectoris

• Calcium channel blockers (CCBs)
• effective monotherapy (usually used if patients
  are intolerant of ß-blockers)
• generally used in combination with ß-blockers
• improve coronary blood flow through coronary
  artery vasodilation, decrease MVO2
• provide better skeletal muscle oxygenation than
  ß-blockers ? decrease fatigue, improve exercise
  tolerance
• CCBs have similar efficacy
• differences in electrophysiology,
  peripheral/central hemodynamic effects, ADR
  profiles useful in selecting appropriate agent

63
Stable Exertional Angina Pectoris

• Calcium channel blockers (CCBs)
• ideal candidates
• contraindications/intolerance to ß-blockers
• coeixting conduction system disease (except
  verapamil, diltiazem)
• Prinzmetal angina
• peripheral vascular disease
• severe ventricular dysfunction (amlodipine drug
  of choice)
• concurrent HTN

64
Stable Exertional Angina Pectoris

• Calcium channel blockers (CCBs)
• vasodilation of systemic arterioles coronary
  arteries
• reduction of arterial pressure and coronary
  vascular resistance
• depression of myocardial contractility
  conduction velocity of the SA/AV nodes
• MVO2 reduction due to reduced wall tension 2? to
  reduced arterial pressure
• may improve coronary blood flow through areas of
  fixed coronary obstruction
• inhibits coronary artery vasomotion/vasospasm
• non-dihydropyridine products affect AV conduction
  and contractility

65
Stable Exertional Angina Pectoris

• Calcium channel blockers (CCBs)
• large, variable, 1st-pass metabolism
• 20 to 50 bioavailability for diltiazem,
  nicardipine, nifedipine, verapamil, felodipine,
  isradipine
• amlodipine bioavailability 60 to 80
• most CCBs eliminated via CYP 3A4 other CYP
  isoenzymes

66
Stable Exertional Angina Pectoris

• Ranolazine
• reduces Ca2 overload in ischemic myocytes
  through selective inhibition of late Na current
  (INa)
• does not affect HR, inotropic state, hemodynamic
  state or increase coronary blood flow
• indicated for chronic angina treatment
• prolongs QT interval
• reserved for patients who have not achieved
  adequate response with other antianginal agents

67
Stable Exertional Angina Pectoris

• Ranolazine
• dose 500 mg BID then 1000 mg BID
• contraindications
• preexisting QT interval prolongation
• hepatic impairment
• drug interactions
• other QT interval-prolonging medications
• cytochrome P450 3A inhibitors decrease ranolazine
  clearance

68
Clinical Controversy

• MERLIN-TIMI 36
• Metabolic Efficiency With Ranolazine for Less
  Ischemia in Non-ST-Elevation Acute Coronary
  Syndromes
• Randomized, double-blind, controlled trial
  (n6560)
• 2 groups
• ranolazine 1000 mg BID
• placebo

Morrow DA, Scirica BM, Karwatowska-Prokopczuk E,
et al. Effects of ranolazine on recurrent
cardiovascular events in patients with
non-ST-elevation acute coronary syndromes the
MERLIN TIMI 36 randomized trial. JAMA
20072971775 83.
Evaluation of the Glycometabolic Effects of
Ranolazine in Patients With and Without Diabetes
Mellitus in the MERLIN-TIMI 36 Randomized
Controlled Trial Circulation, 2009 119 2032 -
2039.
69
Clinical Controversy

• MERLIN-TIMI 36 results
• NSTEMI angina symptom relief
• 6.2 HbA1c reduction at 4 months ranolazine
  group
• 5.9 HbA1c reduction at 4 months placebo
• 0.30 versus 0.04 (plt0.001) clinical
  significance?
• no significant reduction in composite 1 outcome
  at (median follow-up 348 days)
• CV death
• MI, recurrent ischemia

Morrow DA, Scirica BM, Karwatowska-Prokopczuk E,
et al. Effects of ranolazine on recurrent
cardiovascular events in patients with
non-ST-elevation acute coronary syndromes the
MERLIN TIMI 36 randomized trial. JAMA
20072971775 83.
Evaluation of the Glycometabolic Effects of
Ranolazine in Patients With and Without Diabetes
Mellitus in the MERLIN-TIMI 36 Randomized
Controlled Trial Circulation, 2009 119 2032 -
2039.
70
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72
Stable Exertional Angina Pectoris

• Nonpharmacologic therapy
• revascularization
• coronary artery bypass grafting
• percutaneous transluminal coronary angioplasty

73
Recommended Mode of Coronary Revascularization  
CABG, coronary artery bypass grafting EF,
ejection fraction LAD, left anterior descending
coronary artery PCI, percutaneous coronary
intervention. a50 diameter stenosis
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
74
(No Transcript)
75
Stable Exertional Angina Pectoris

• Revascularization
• based on extent of coronary disease ( of
  vessels, location/amount of stenosis)
  ventricular function
• complications coronary artery spasm,
  intraluminal thrombus
• combination therapy with acetylsalicylic acid,
  unfractionated heparin, or low-molecular-weight
  heparin, glycoprotein IIb/IIIa receptor
  antagonists stents have reduced occurrence of
  reocclusion late restenosis

76
Stable Exertional Angina Pectoris

• Coronary artery bypass grafting (CABG)
• reduces symptomatic angina not controlled by
  medical management or PCI
• improves patient lifestyle
• reduces CAD mortality
• reduces need for nitrates, ß-blockers

77
Stable Exertional Angina Pectoris

• Percutaneous transluminal coronary angioplasty
  (PTCA)
• reduced stenosis due to
• compression, redistribution of plaque
• embolization of plaque contents
• aneurysm formation
• disruption of plaque arterial wall
• patients usually heparinized during PTCA to
  prevent immediate thrombus formation at site of
  arterial injury
• anticoagulation up to 24 hrs

78
Stable Exertional Angina Pectoris

• Percutaneous transluminal coronary angioplasty
  (PTCA)
• prevention of restenosis
• combination therapy with acetylsalicylic acid,
  heparin, GP IIa/IIIa receptor antagonists
• bivalirudin
• drug-eluting bare metal stents

79
Stable Exertional Angina Pectoris

• PTCA vs CABG
• low-risk patients have greater alleviation of
  symptoms with PTCA
• moderate-risk patients had equal mortality MI
  rates with PTCA or CABG
• high-risk patients showed improved survival with
  CABG than medical therapy

80
Stable Exertional Angina Pectoris

• Drug-eluting stents
• sirolimus (Cypher)
• paclitaxel (Taxus)
• zotarolimus (Endeavor)
• target revascularization needed less often than
  bare stents
• combination antiplatelet therapy (ASA
  clopidogrel) for gt 1 yr following implantation

Eisenberg MJ Richard PR, BSc Libersan D Filion
KB. Safety of Short-Term Discontinuation of
Antiplatelet Therapy in Patients With
Drug-Eluting Stents. Circulation. 2009 119
1634-1642.
81
Drug-eluting stents

• Antiplatelet therapy often discontinued in
  surgical patients with drug-eluting stents
• risk factor for late stent thrombosis
• Medline search for late very late stent
  thrombosis cases Jan 2001 to July 2008
• When patients stopped antiplatelet agents
  simultaneously, median time to event 7 days
• If the thienopyridine was stopped ASA
  continued, median time to event 122 days

Eisenberg MJ Richard PR, BSc Libersan D Filion
KB. Safety of Short-Term Discontinuation of
Antiplatelet Therapy in Patients With
Drug-Eluting Stents. Circulation. 2009 119
1634-1642.
82
Variant Angina Pectoris

• Prinzmetal angina
• associated with ST-segment elevation
• commonly resolves without progression to MI
• usually younger patients

83
Variant Angina Pectoris

• Causes
• imbalance between endothelium-produced
  vasodilator factors (prostacyclin, nitric oxide)
  vasoconstrictor factors (endothelin,
  angiotensin II)
• imbalance of autonomic control characterized by
  parasympathetic dominance of inflammation
• adrenoreceptor polymorphisms may predispose
  patients to developing vasospasm

84
Variant Angina Pectoris

• Precipitating factors
• hyperventilation
• exercise
• exposure to cold
• May have no apparent precipitating cause

85
Coronary Artery Spasm

• Diagnosis
• ST-segment elevation during transient chest
  discomfort (usually at rest) that resolves when
  chest discomfort diminishes in patients with
  normal or non-obstructive lesions
• In absence of ST-segment elevation, may use
  provocative tests to precipitate coronary artery
  spasm
• ergonovine, acetylcholine, methacholine
• withdraw nitrates CCB prior to testing

86
Coronary Artery Spasm

• Treatment
• optimization of therapy includes dose titration
• treat all patients for acute attacks
• maintain prophylactic treatment 6 to 12 months
  following initial episode
• eliminate aggravating factors
• alcohol
• cocaine
• cigarette smoking

87
Coronary Artery Spasm

• Treatment
• nitrates for acute attacks
• CCBs
• nifedipine, verapamil, diltiazem equally
  effective single agents for initial treatment
• dose titration needed
• combination therapy with nifedipine-diltiazem or
  nifedipine-verapamil useful for patients
  unresponsive to single-drug regimens
• ß-blockers have little or no role

88
Silent Ischemia

• Associated with ST-segment elevation, depression
• Frequently occurs without antecedent HR, BP
  changes
• ischemia from reduction in O2 supply
• 2 classes
• Class I patients do not experience angina
• Class II patients have both asymptomatic
  symptomatic ischemia
• Associated with reduced survival, increased need
  for PTCA/CABG, increased risk of acute MI

89
Silent Ischemia

• Causes
• increased physical activity
• sympathetic nervous system activation
• ? cortisol secretion
• ? coronary artery tone
• enhanced platelet aggregation due to endothelial
  dysfunction leading to intermittent coronary
  obstruction

90
Silent Ischemia

• Diagnosis ambulatory ECG
• Initial management
• modify IHD risk factors
• HTN
• hypercholesterolemia
• smoking
• Treatment goal
• reduce number of ischemic episodes (symptomatic
  asymptomatic), regardless of direction of
  ST-segment shift

91
Silent Ischemia

• Pharmacologic treatment
• ß-blockers
• most useful for post-MI patients or those with
  high level of sympathetic nervous system activity
• CCBs alone or in combination effective in
  reducing symptomatic asymptomatic ischemia
• do not interrupt diurnal surge in ischemia
• less effective than ß-blockers
• combination ß-blockers CCBs better response
  than CCBs nitrates or CCB monotherapy

92
Therapeutic Outcomes

• Angina symptom improvement
• Improved cardiac performance
• Risk factor reduction
• Increased exercise capacity
• May use coronary angiography to assess extent of
  stenosis or restenosis after angioplasty or CABG

93
Clinical Controversy

• Many long-term trials compare ß-blockade vs CCBs
  to determine superior survival benefit
• ß-blockers recommended 1st line prophylactic
  therapy for symptomatic angina patients requiring
  daily pharmacologic therapy
• effective in post-MI patients
• favorable adverse effect profile
• Stable CAD medical management produces outcomes
  similar to revascularization
• may impact future use of healthcare resources

94
Clinical Controversy

• Recent developments in understanding organic
  nitrates bioactivation raise concern over
  endothelial dysfunction induced by long-term
  nitrate administration
• Nitrate products activated via different
  mechanisms
• impacts long-term effectiveness of individual
  drugs

95
American College of Cardiology, American Heart
Association, and Physician Consortium for
Performance Improvement Chronic Stable Coronary
Artery Disease Core Physician Performance
Measurement Seta
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
96
American College of Cardiology, American Heart
Association, and Physician Consortium for
Performance Improvement Chronic Stable Coronary
Artery Disease Core Physician Performance
Measurement Seta
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
97
American College of Cardiology, American Heart
Association, and Physician Consortium for
Performance Improvement Chronic Stable Coronary
Artery Disease Core Physician Performance
Measurement Seta
DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
98
Table Footnotes

• aRefers to all patients diagnosed with CAD
• bMedical reasons for not prescribing antiplatelet
  therapy (aspirin, clopidogrel, or combination of
  aspirin and dipyridamole) active bleeding in the
  previous 6 months with required hospitalization
  and/or transfusion(s), patient on other
  antiplately therapy, etc.
• Medical reasons for not prescribing a statin
  clinical judgement, documented LCL-C lt 130 mg/dL,
  etc.
• Medical reasons for not prescribing a ß-blocker
  bradycardia (defined as heart rate lt 50 beats/min
  without ß-blocker therapy), history of class IV
  (congestive) heart failure, history of second- or
  third-degree atrioventricular block without
  permanent pacemaker, etc.
• Medical reasons for not prescribing ACE inhibitor
  (ACEI) allergy, angioedema caused by ACEI,
  anuric rental failure caused by ACEI, pregnancy,
  moderate or severe aortic stenosis, etc.
• cPatient reasons for not prescribing antiplatelet
  therapy, statin, -blocker, or ACEI economic,
  social, and/or religious, etc.
• dAntiplatelet therapy may include aspirin,
  clopidogrel, or combination of aspirin and
  dipyridamole.
• eNot indicated for a statin refers to LCL-C lt 100
  mg/dL.
• fTest measure.
• gScreening for diabetes is usually done by
  fasting blood glucose or 2-hour glucose tolerance
  testing. Clinical recommendations indicate
  screening should be considered at 3-year
  intervals.

DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells
BG, Posey LM Pharmacotherapy A Pathophysiologic
Approach, 7th Edition http//www.accesspharmacy.c
om
99
Acknowledgements

• Prepared By Amy Pai, Pharm.D.
• Series Editor April Casselman, Pharm.D.
• Editor-in-Chief Robert L. Talbert, Pharm.D.,
  FCCP, BCPS, FAHA
• Chapter Author/Section Editor
• Robert L. Talbert, Pharm.D., FCCP, BCPS, FAHA