Myocarditis/Cardiomyopathy Flashcards
What is Cardiomyopathy?
Structural/functional abnormality of heart muscle in the absence of:
- CAD
- HTN
- Valvular disease
- Congenital heart disease
What are the three main structural/functional categories of cardiomyopathy?
- Dilated
- Hypertrophic
- Restrictive
What is the most common cardiomyopathy
Dilated
Define Dilated cardiomyopathy
Thin, enlarged ventricular wall, systolic dysfunction
Define hypertrophic cardiomyopathy
Myocardial hypertrophy (thick muscle) in the absence of HTN or aortic stenosis
Define restrictive cardiomyopathy
Nondilated ventricles, impaired filling, reduced diastolic function
Define Heart Failure
- Systemic perfusion being inadequate to meet the body’s metabolic demand
- Due to any structural or functional cardiovascular abnormality causing a supply/demand mismatch
What is the main cause of dilated cardiomyopathy?
Idiopathic
What are the other non-idiopathic causes for dilated cardiomyopathy?
"ABCD PIG": Alcohol Beriberi (thiamine deficiency) Coxsackie B, Chagas disease Drugs: doxorubicin (anthracycline), cocaine Pregnancy Infection Genetic
What is the most common cause of heart failure due to systolic dysfunction?
Ischemic cardiomyopathy
What is a common cause of dilated cardiomyopathy?
Ischemic cardiomyopathy
How is Ischemic cardiomyopathy characterized?
LVEF≤35-40%
- coronary artery disease
- often occurs after MI
Treatment for ischemic cardiomyopathy
Aspirin High-intensity statin Beta-blocker ACE-inhibitor Loop diuretic if fluid overload
How is hypertensive cardiomyopathy characterized?
Concentric LVH
What can lead to hypertensive cardiomyopathy?
Uncontrolled and sustained HTN over a long time period
Define alcoholic cardiomyopathy
Excessive alcohol use leads to myocardial dysfunction
Who is at risk for alcoholic cardiomyopathy?
> 90g (7-8 drinks) per day for at least 5 years
When would you see a prolonged QTc (precursor to ventricular arrhythmias)
Alcoholic cardiomyopathy
Define Peripartum Cardiomyopathy
- Development of heart failure late in pregnancy or within 5 months of giving birth
- LVEF<45% with or without dilation
- Most common w/in 1 month postpartum
What are the risk factors for Peripartum Cardiomyopathy?
- age>30
- African descent
- Cocaine abuse
- Multiple fetuses
- Preeclampsia/eclampsia
What is the treatment for Peripartum Cardiomyopathy?
Heart transplant performed in 1/3
- diuretics
- Beta-blockers
- ACEi (DO NOT BREAST FEED)
Define Takotsubo Cardiomyopathy
- “Stress Cardiomyopathy” –>Catecholamine induced
- transient LV dysfunction
- on Echo: systolic apical ballooning
- Substernal pain
Investigation findings of Takotsubo Cardiomyopathy
- Troponin levels often 7x the upper limit of normal
- ECG with ST-elevation is common (Transient)
- Echocardiography shows apical ballooning pattern, decreased LVEF