Cardiology Flashcards
Goals of primary prevention in CAD
Maintain or achieve ideal weight
Physical activity
Eat healthy diet
Fruits, vegetables, fiber, low glycemic index, unsaturated fats, omega-3 fatty acids (Mediterranean diet)
Refrain from cigarette smoking (and vaping)
Maintain blood pressure at goal
<140/90 if low risk
<130/80 if risk factors of known CAD
Maintain normal ‘bad’ cholesterol levels (LDL)
Glycemic control in diabetes
High risk patients <70 y/o without bleeding risk, should take aspirin daily (*new guidelines)
Small amount of alcohol consumption (less than 2 drinks/day)
Risk Factors for CAD
- Age >65yrs
- Gender (male > female until menopause)
- Cigarette smoking
- Dyslipidemia (abnormal cholesterol levels)
- Hypertension (HTN)
- Abdominal obesity (central obesity)
- Family history of 1st degree relative with premature MI (men age <55 women <65)
risk factor that is considered a “coronary artery disease equivalent”
Diabetes
Define Metabolic Syndrome
•Constellation of metabolic abnormalities that confer increased risk of CAD
Three or more of the following
- Abdominal obesity
- Triglycerides >150mg/dL
- HDL <40mg/dl for men and <50mg/dl for women
- Fasting glucose ≥ 110mg/dL (hyperglycemia/insulin resistance)
- Hypertension
what artery supplies blood to left ventricle and atrium
Left main coronary a.
The left anterior descending artery branches off the left coronary artery and supplies blood to the front of the left
The circumflex artery branches off the left coronary artery and encircles the heart muscle. This artery supplies blood to the outer side and back of the heart.
Which coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes
Right coronary artery (RCA).
symptoms of chronic stable angina
- Chest discomfort or dyspnea with exertion lasting ~5-15 minutes, predictable & reproducible (due to flow limiting lesion)
- Relieved by rest and/or nitroglycerin
- Description of discomfort varies
- Tightness, squeezing, burning, gas, indigestion or ill characterized
- Typically located central or slightly left side of chest
- Pre-syncope (lightheadedness)
- Fatigue
exclusion criteria for ETT
- ST abnormalities
- LVH
- LBBB
- Vent-paced
- WPW
when would we include imaging stress tests
include imaging if patient has known CAD or multiple risk factors 2
Name types of imaging and nonimaging stress tests
- Non-Imaging Test
- Exercise tolerance testing (ETT) (uses treadmill & EKG)
Imaging Tests – include imaging if patient has known CAD or multiple risk factors 2.
- Echocardiography (exercise or pharmacologic)
- Radionuclide myocardial perfusion imaging (exercise or pharmacologic)
- Positron emission tomography (PET) (almost always pharmacologic)
first line stress test for most pts
ETT
describe Radionuclide myocardial perfusion imaging
Exercise or pharmacologic
Imaging before and after stress
Inject radioactive nucleotide
Poorly perfused areas of the heart do not take up color, localize lesion to coronary artery
Highly sensitive
what test would we use to look for stress induced regional wall motion abnormalities (RWMAs
stress echo
to localize lesion to particular coronary artery
Wont contract normally with the rest of the heart
**operator dependent
when would we use Nuclear Medicine PET CT stress test
Very sensitive
Very expensive
Best test for obese patients
Not readily available
classif presentation of ACS
- Early morning
- Substernal chest pressure, “like and elephant sitting on my chest.”
- Severe
- Sense of impending doom
- Radiates to L arm, both arms or jaw
- Associated shortness of breath, nausea, diaphoresis, lightheadedness
- Lasts >20min but <1 hr
- Risk factors
- Poor exercise tolerance at baseline
3 types of ACS
- Unstable Angina
- Non-ST Elevation Myocardial Infarction (NSTEMI)
- ST Elevation Myocardial Infarction (STEMI)
- **(most serious of the three)
Unstable plaque without plaque rupture is what type of ACS?
What would we see on EKG
unstable angina
Ischemic symptoms suggestive of ACS and no elevation of cardiac biomarkers (Troponin).
May or may not have ST depressions or non-specific changes (i.e. T wave inversion).
EKG can be normal
Potentially same manifestations as UA but do have elevated cardiac biomarkers (Troponin) suggestive of myocardial tissue death
sx?
NSTEMI
Unstable plaque +/- rupture (incomplete or complete occlusion)
Plaque rupture with complete occlusion
STEMI
what are the anterior leads and corresponding artery
V2, V3, V4
LAD
what are the left lateral leads
I, aVL, V5, V6
Left circumflex a
Name inferior leads and corresponding a.
II, III, aVF
Right coronary a.
name right ventricular leads and corresponding a.
aVR, V1
Right coronary a
name osterior leads and corresponding a
ST depressions in V2-V4
RCA
New LBBB in setting of acute CP is ____ until proven otherwise
MI
Recall which patients need urgent coronary artery reperfusion (catheterization and percutaneous intervention)
- Hemodynamic instability or cardiogenic shock
- Severe left ventricular dysfunction or heart failure
- Recurrent or persistent rest angina despite intensive medical therapy
- New or worsening mitral regurgitation
- Sustained ventricular arrhythmias
Immediate tx of ST elevation in MI
- cute Triage
- Responsiveness, airway, breathing, and circulation
- Evidence of systemic hypoperfusion/cardiogenic shock (hypotension, tachycardia, impaired cognition, cool/clammy)
- Congestive heart failure
- Ventricular arrhythmias
- Activate cardiac catheterization lab (cath lab)
- IV heparin bolus then continuous infusion
- MONA (morphine, oxygen (if needed), nitrates, aspirin)
- Oxygen if arterial O2 saturation ≤90% or respiratory distress
- Consider Glycoprotein IIb/IIIa inhibitors (Eptifibatide- (Integrilin))
- Percutaneous coronary intervention (PCI) – if available yields highest rates of survival if reperfusion is done within 90min (Door to balloon time). (consider transfer – ?allow 120min)
- Fibrinolytic therapy if PCI not available
- Beta-blocker
- Optimize potassium & magnesium
- * If patient is found to have severe 3 vessel disease during PCI à will need coronary artery bypass graft surgery (CABG)
All patients with known CAD should be on
•Asa, BB, and statin if no contraindications
recognize demand ischemia
Describe the pathophysiology of Prinzmetal angina
Vascular smooth muscle hyper-reactivity
- Generally caused by focal spasm of a major coronary artery
- Results in high grade obstruction
- Transient myocardial ischemia
- Occasionally myocardial infarction
Spasm occurs in the absence of oxygen supply/demand mismatch
• Can happen in normal or diseased vessels
clinical features of Prinzmetal angina
Angina symptoms at rest
Often between midnight and early morning
Associated with transient (15min) ST segment elevation
Triggered by coronary artery vasospasm
Generally in the absence of high grade coronary artery stenosis
Few if any cardiovascular risk factors
Drug use
Repeat EKG after 15min with total resolution of ST segments
EKG findings in vasospastic angina
Repeat EKG after 15min with total resolution of ST segments
tx of vasospastic angina
Sublingual nitroglycerin as needed during episodes
Smoking cessation
Long acting nitrates
CCBs
Si/sx of Hypertrophic obstructive cardiomyopathy
fatigue, dyspnea, chest pain, palpitations, presyncope or syncope
– Diastolic dysfunction
Myocardial ischemia
Mitral regurgitation
Systolic dysfunction (end-stage)
– Heart failure
Supraventricular and ventricular arrhythmias
Sudden death - most common cause in young people
Teenagers and young adults who collapse and lose consciousness during exercise
PE finding of Hypertrophic obstructive cardiomyopathy
Harsh crescendo-decrescendo systolic murmur
– Increase intensity with Valsalva maneuver
– Decrease intensity with squatting
**preload dependent
Hypertrophy of the ventricular septum – Significant left ventricular outflow tract (LVOT) obstruction
how does heart look in hypertrophic obst ructive cardiomyopathy
– Hypertrophy of the ventricular septum – Significant left ventricular outflow tract (LVOT) obstruction
Diastolic dysfunction
systolic dys (late-stage)
Takotsubo cardiomyopathy si/sx
severe psychological stress
Takotsubo cardiomyopathy PE / EKG findings
– Left ventricular apical ballooning
– ST elevation without CAD
dilated cardiomyopathy - impaired systolic function
cause of Chagas dz
– Protozoan infection (Trypanosoma cruzi)
Leading cause of DCM in Central and S. America
si/sx chagas dz
– Nonspecific EKG abnormalities
– Left ventricular apical aneurysms
•Apex of the heart dilates
– Heart failure
– Arrhythmias & heart blocks (all types)
Thromboembolism (right or left ventricular mural thrombi)
• Pulmonary Embolism
• Cerebrovascular accident (CVA) = stroke
– Chest pain
dilated vs restrictive cardiomyopathy
dilated:
Dilatation and impaired contraction of one or both ventricles –
- Impaired systolic function
- (Ejection Fraction (EF) <40%
restrictive
Non-dilated ventricles with impaired ventricular filling
Hypertrophy is typically absent (normal wall thickness)
Muscle layers are stiff and reduced stretching
Rigid ventricular walls resulting in diastolic dysfunction
Systolic function usually remains normal à cardiac output is reduced bc total volume in ventricle in diastole is reduced
•EF is preserved
Biatrial enlargement
dilated MC is a systolic / diastolic dysfunction white restrictive CM is systolic / diastolic
dilated - systoluc
restrictive - diastolic
dilated MC EF is _____ while in restrictive CM EF is ____.
dilated: EF reduced
restrictive EF preserved
common causes of dilated CM
1.Idiopathic (most common – often familial/gene mutations LMNA Gene mutations (LaminA/C)
Infections (i.e. viral myocarditis, Chagas disease)
- Toxins (drugs, meds, alcohol)
- Tachycardia induced CMP 5.
- Stress (takotsubo) – sometimes considered “unclassified”