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Transcript of CORONARY ARTERY DISEASE: PATHOPHYSIOLOGY AND PRIMARY PREVENTION · pathophysiology and primary...
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C O R O N A R Y A R T E R Y D I S E A S E : PAT H O P H Y S I O L O G Y A N D
P R I M A R Y P R E V E N T I O NB E N H U D S O N
9 / 1 6 / 1 7
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O B J E C T I V E S
• Explain the basics of the pathophysiology of CAD
• Identify risk factors and use them to predict risk of symptomatic CAD.
• Appropriate selection of non-invasive testing to further risk stratify asymptomatic patients without CAD.
• Identify effective therapies for primary prevention of CAD.
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PAT H O P H Y S I O L O G Y
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PAT H O P H Y S I O L O G Y
• This is not a new disease - plaques seen in Egyptian mummies.
• This is not a disease of the elderly - it starts in our teenage years.
• Plaques may not grow in a continuous fashion but may grow in “bursts”.
• Most MI’s result from lesions that do not limit flow.
• This is a disease that is still not fully understood - Why plaques form where they do, complex interplay of cell signaling, why/when plaques rupture
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PAT H O P H Y S I O L O G Y
• Arteries have a trilaminar structure
• Intima - endothelial cells separated by medial layer by an internal elastic lamina. In adults there is often some thickening to include connective tissue and smooth muscle cells.
• Media - Concentric layers of smooth muscles cells interwoven with an elastin-rich matrix. It is bordered by the internal and external elastic lamina.
• Adventitia - loosely arranged collagen connective tissue. Cells are less common than other layers and are mostly fibroblasts and mast cells. Vaso vasorum and nerve endings are typically in the adventitia.
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A R T E R Y S T R U C T U R E
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PAT H O P H Y S I O L O G Y
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PAT H O P H Y S I O L O G Y
• Lesion locality
• The spatial heterogeneity is difficult to explain
• Common locations of lesions include proximal portions of vessels after branch points or bifurcations suggest a hemodynamic cause.
• Others have suggested atheromas develop from being leiomyomas of the artery wall.
• Angiogenesis - plaque microcirculation
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PAT H O P H Y S I O L O G Y
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PAT H O P H Y S I O L O G Y
• MI
• Most MI’s (2/3) occur fracture of a plaque’s fibrous cap.
• Superficial erosion is the second most common cause of MI (25%, more common in women than men).
• Most plaque disruptions do not cause MI.
• It is difficult to identify the vulnerable or high-risk plaques
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PAT H O P H Y S I O L O G Y
• Risk factors and atherogenesis
• Smoking - promotes endothelial injury, adversely effects endothelial function and promotes platelet adhesion and monocyte adhesion.
• Diabetes - thought to enhance monocyte adhesion to the endothelium. Also reduces endothelial function and promotes a pro-thrombotic state.
• Hypertension - damages endothelial cells which promotes lipid accumulation and stimulates suboptimal smooth muscle proliferation.
• Hyperlipidemia - excess LDL is available to initiate atherosclerosis.
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P R I M A R Y P R E V E N T I O N
• Why do we screen?
• Ischemic heart disease is the #1 killer in America
• Nearly half of men that reach middle age and a third of women will have symptomatic CAD in their lifetime.
• Mortality rates and age-adjusted CAD rates have actually been on the decline but number of new cases is unchanged
• Actual cases of CAD has remained stable.
• We have treatment options to decrease risk of developing symptomatic CAD.
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P R I M A R Y P R E V E N T I O N
• When should we start screening?
• Guidelines say we should assess traditional risk factors starting at age 20.
• Estimate 10 year risk starting at age 40.
• Estimate lifetime risk risk starting at age 20.
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P R I M A R Y P R E V E N T I O N
• Traditional risk factors
• Smoking
• Diabetes
• Hypertension
• Hyperlipidemia
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P R I M A R Y P R E V E N T I O N
• Traditional risk factors - its complicated…
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P R I M A R Y P R E V E N T I O N
• How to screen?
• ASCVD/Pooled cohort recommended as the screening calculator of choice by ACC/AHA
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P R I M A R Y P R E V E N T I O N
• Other risk factors
• Metabolic syndrome
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P R I M A R Y P R E V E N T I O N
• Other risk factors
• Metabolic syndrome
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P R I M A R Y P R E V E N T I O N
• Risk scores aren’t perfect…
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P R I M A R Y P R E V E N T I O N
• Other tests/risk factors that may be helpful to risk stratify low/intermediate risk patients
• Family history of premature CAD (men <55 or women <65)
• Elevated coronary artery calcium score
• Elevated hs-CRP
• ABI <0.9
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P R I M A R Y P R E V E N T I O N
• Other screening tests
• EKG - reasonable in just about everyone
• Stress testing
• ETT - Reasonable in asymptomatic patients if intermediate risk, particularly if initiating an exercise program.
• Nuclear imaging or stress echo - generally not recommended in asymptomatic individuals as a screening tool for CAD.
• Transthoracic echo - generally not recommended in asymptomatic individuals as screening for CAD. May have a role when hypertensive heart disease is suspected.
• Coronary CTA - Not recommended in asymptomatic individuals
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P R I M A R Y P R E V E N T I O N
• Advanced lipoprotein analysis…
• Discriminating between small, dense LDL and large, less dense LDL.
• Apolipoprotein B levels predict CV risk better than LDL
• Non-HDL cholesterol
• Lipoprotein (a) - a type of LDL that has a strong correlation to excess risk of CVD.
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P R I M A R Y P R E V E N T I O N
• Advanced lipoprotein analysis…
• Discriminating between small, dense LDL and large, less dense LDL.
• Apoplipoprotein B levels predict CV risk better than LDL
• Non-HDL cholesterol
• Lipoprotein (a) - a type of LDL that has a strong correlation to excess risk of CVD.
L I T T L E O R N O D ATA T H AT T H E S E A D D I N C R E M E N TA L B E N E F I T T O R I S K A N A LY S I S O R T H AT TA R G E T E D T R E AT M E N T C H A N G E S
O U T C O M E S .
R O U T I N E M E A S U R E M E N T I S N O T R E C O M M E N D E D .
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P R I M A R Y P R E V E N T I O N
• Management - Life’s simple 7!
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P R I M A R Y P R E V E N T I O N
• Management - Life’s simple 7!
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P R I M A R Y P R E V E N T I O N
• Management - Life’s simple 7!
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P R I M A R Y P R E V E N T I O N
• Management - Life’s simple 7!
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P R I M A R Y P R E V E N T I O N• Management - Exercise
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P R I M A R Y P R E V E N T I O N• Management - Exercise
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P R I M A R Y P R E V E N T I O N
• Management - Exercise
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P R I M A R Y P R E V E N T I O N
• Management - smoking cessation
• Recommendation is complete cessation and avoidance of 2nd hand smoke.
• Smoking cessation decreases risk of CAD by ~33%
• Best results with cessation are a combination of counseling and pharmacologic therapies which is more effect than either therapy alone.
• Proven drug therapies include:
• Nicotine replacement
• Varenicline
• Bupropion
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P R I M A R Y P R E V E N T I O N• Management - smoking cessation
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P R I M A R Y P R E V E N T I O N
• Management - Normal weight
• Goal BMI 18-25 and waist circumference <40in in men and 35in in women.
• Weight loss of 5-10% of body weight can have profound impact on other risk factors (i.e. reduction in risk of diabetes).
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P R I M A R Y P R E V E N T I O N
• Management - Glucose control
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P R I M A R Y P R E V E N T I O N
• Management - Glucose control
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P R I M A R Y P R E V E N T I O N
• Management - Diet
• Decreased processed foods
• Limit sugars and foods with added sugars
• Limit refined grains
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P R I M A R Y P R E V E N T I O N
• Management - Mediterranean Diet
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P R I M A R Y P R E V E N T I O N• Management -
Lipid control…
8/16/17, 11(59 PMMajor recommendations for statin therapy for ASCVD prevention.png 1,241×1,780 pixels
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P R I M A R Y P R E V E N T I O N
• Management - Lipid control
• Are risk calculators helpful in deciding when to initiate a statin?
• It identifies those at high risk that need priority in risk reduction
• But are they really the best tool we have to identify those that will benefit from statins?
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P R I M A R Y P R E V E N T I O N
• Management - Lipid control
• Statins in patients on hemodialysis
• Multiple studies show no difference in MACE comparing statin to placebo.
• Slight trend to significance in reduction of cardiac events (excluding stroke)
• Statins in patients with ischemic and non-ischemic cardiomyopathy (EF ~30%)
• Two large studies showed no reduction in MACE or hospital admission
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P R I M A R Y P R E V E N T I O N
• Management - Lipid control
• What to add to statins?
• Fibrates - No effect on mortality
• Niacin - AIM-HIGH trial, adding niacin to simvastatin was not beneficial
• Fish oil - majority of trials show no benefit on MACE outcomes
• Ezetimibe - IMPROVE-IT trial showed a 2% decrease in event rate when added to simvastatin.
• PCSK9 inhibitors - outcome data looks promising. Indications include familial hypercholesterolemia and LDL >100 in those with CVD on max statin and/or ezetimibe therapy. Problem - EXPENSIVE
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P R I M A R Y P R E V E N T I O N• Management - Aspirin