Cardiology Flashcards
What is the most common cause of CHF
Coronary Artery Disease (CAD)
What are the 3 forms of CHF
- Left vs. Right Sided
- Systolic vs. Diastolic
- High vs. Low Outlet
What are common causes of left and right sided heart failure
Left sided: CAD and HTN
Right sided: Left HF, pulmonary disease
What are the 3 compensatory mechanisms for HF
Increased preload
Increased afterload
Decreased contractility
What happens to the kidneys in CHF
Decreased renal perfusion so they compensate
How do the kidneys compensate with CHF and why
The kidneys aren’t getting enough blood, so they think the body is dehydrated
They stimulate the renin-angiotensin-aldosterone and ADH system
That results in fluid and sodium retention and fluid overload (central and peripheral) EDEMA
What happens to the ventricles when preload increases (volume overload)
Ventricles dilate (leads to increase in BNP)
List the steps in cycle resulting from poor cardiac function and fluid accumulation in the lung with hypoxemia
Acute LV systolic Dysfunction
Decreased myocardial contractility and CO
Catecholamine production (increases HR and BP)
Increase in SVR (Afterload) and BP
Increased myocardial wall tension and O2 demands
Leads to diastolic dysfunction, increased pulmonary artery and capillary hydrostatic pressures, hypoxia, and increases myocardial ischemia
What disease processes are associated with low output HF
CAD Severe HTN Valvular disease Cardiomyopathy Dysrhythmias Massive PE
What disease process are associated with high output HF
Increased metabolic demands
Thyroxicosis, severe anemia, AV fistula, Beriberi (thiamine deficiency), Paget’s Disease
What symptoms are noted with Left HF
*Think about things that would result from fluid buildup in lungs due to increased pulmonary venous pressure**
Dyspnea, Orthopnea, paroxysmal nocturnal dyspnea, weakness, fatigue, tachycardia, basilar rales, Cheyne Stoke’s breathing
What symptoms are noted with Right HF
JVSD, Peripheral edema, RUQ pain, Ascites, Hepatomegaly
What is the most useful diagnostic test for CHF. What do you see?
Echo
Systolic and diastolic function, ventricular hypertrophy, wall motion abnormalities, valvular disorders
What is the most important determinant in prognosis for CHF and how do you measure it.
Ejection Fraction, measured by Echo
Normal EF is 55-60
EF
What are two other methods to Dx HF
CXR: Cardiomegaly, Cephalization, Kerley B lines, pleural effusions
BNP: Released due to volume overload
What should all patients with CHF be placed on. Why?
Ace-I and Diuretic
What two therapies have proven to improve OUTCOMES in CHF
Ace-I and Beta-Blocker
What two therapies improve Sx in CHF
Nitrates and diuretics (loop or thiazide)
What do Nitrates and diuretics do?
Decrease preload
What do Ace-I do?
Decrease afterload and improve CO and improve renal perfusion
Decrease aldosterone production and potentiate other vasodilators
What do Beta-Blockers do?
Decrease catecholamines
What are examples of Positive Inotropes or Sympathomimetics
Digoxin, Dobutamine, Dopamine
Management of CHF
think LMNOP
Lasix (Ace-I) Morphine Nitrates Oxygen Position (place upright to decrease venous return)
Also, Nesiritide which is a synthetic BNP and decreases RAAS activation which leads to sodium excretion
What is the most common type of Cardiomyopathy
Dilated Cardiomyopathy
What results with dilated cardiomyopathy
Systolic dysfunction
Ventricles can’t contract well so there is poor EF
Heart compensates by dilating
What are some causes of dilated cardiomyopathy
Idiopathic
Viral (Enterovirus like Coxsackie and Echovirus), Parvovirus
Alcohol abuse, Cocain
Pregnancy
What are some sx of dilated cardiomyopathy
HF sx: Weakness, SOB, peripheral edema, Crackles, S3, JVD
Dx of dilated cardiomyopathy
Echo: See LV dilation, reduced EF, regional or global LV hypokinesis
CXR: Cardiomegaly, curly B-lines
Tx of dilated cardiomyopathy
Think CHF
Ace-I, Diuretics, Digoxin, Beta-Blockers
What do you do in dilated cardiomyopathy if EF
Add implantable defibrillator
What results in Restrictive Cardiomyopathy
Diastolic Dysfunction
Problem with filling
Fibrosis or infiltration of heart muscle, stiff, inflexible
What happens with EF in Restrictive Cardiomyopathy
Normal or near normal
What are causes of Restrictive Cardiomyopathy
Infiltrative Diseases like Amyloidosis, sarcoidosis
What are sx of Restrictive Cardiomyopathy
Think CHF
Kussmaul’s sign (increased JVP)
Dx of Restrictive Cardiomyopathy
Echo: Nondilated ventricles with normal wall thickness, some dilation of atria
CXR: Normal size heart or small
Tx of Restrictive Cardiomyopathy
Treat sx: Diuretics and vasodilators
What is happening in Hypertrophic Cardiomyopathy
Thickened ventricles (usually left) Has components of both systolic and diastolic dysfunction
Sx of Hypertrophic CArdiomyopathy
Sometimes none! Could result in sudden cardiac death (due to V.fib)
Dyspnea, Angina, Syncope, Arrhythmias
How can you increase the sound of a murmur
Valsalva maneuver
It decreases the volume in the LV while creating turbulent flow
How can you decrease the sound of a murmur
Squatting, First Clench
Increases peripheral vascular resistance so dilates aorta and creates less turbulent flow
Dx of Hypertrophic Cardiomyopathy
Echo: Assymetric wall thickness, especially septal, systolic anterior motion of mitral valve
EKG: LVH
CXR: Cardiomegaly
Tx of Hypertrophic Cardiomyopathy
Avoid strenuous exercise Beta Blockers are 1st line CCB, Disopyramide (all 3 are negative inotropes) Surgery: Myomectomy Alcohol Septal Ablation
What is P-Wave
The beat goes through the atrium
What is the PR segment
Beat goes through the AV node
What is QRS
Rapid contraction through ventricle
What is a T wave
Ventricular Repolarization
What is a normal sinus rate
> 60bpm
What is Atrial Fibrillation
Irregularly Irregular Rhythm
No P waves seen
Tx for A.Fib
Rate control: Vagal maneuver, CCB or B-Blocker
Cardioversion may be done BUT need to anticoagulate for 3-4 weeks before doing so so they don’t throw a clot
What are the components of the CHADS2 criteria, and what is it measuring. Tx based on score.
Measuring stroke risk C: CHF H: HTN A: Age>75 D: DM S2: Stroke, TIA, Thrombus (2points) High risk: >2 need to place on Warfarin Moderate risk: 1. Warfarin or ASA Low Risk: 0. No tx or ASA
What are the EKG findings for a 1st degree AV block
1 p for every QRS
PR intervals are prolonged but they are constant
Tx for 1st degree AV block
Nothing. They’re usually age related, effects of meds, myocarditis, etc.
What are the EKG findings for a Type I 2nd degree AV block, and what is another name for this type of block
Mobitz I, Wenkebach
P-waves are constant
PR intervals gradually increase and eventually lead to a dropped QRS complex
What causes a Type I 2nd degree AV block
Heightened vagal tone, normal variant, inferior wall ischemia, tends to be transient
Tx for Type I 2nd degree AV block
Atropine, Epinephrine, Pacer
What are the EKG findings for a Type II 2nd degree AV block, and what is another name for this type of block
Mobitz II
P-waves are constant
PR intervals are constant but there is a dropped QRS complex
Random drop in QRS complex
What causes a Type II 2nd degree AV block
MI, usually anterior MI
Tx for Type II 2nd degree AV block
Pacer
What are the EKG findings for a 3rd degree AV block, and what type of block is this
Complete heart block
P waves are not related to QRS
All P’s are not followed by QRS (results in reduced CO)
PR intervals vary - no apparent association with P-waves and QRS complexes
What are causes of 3rd degree AV block
MI, usually inferior (narrow QRS), or anterior (wider QRS)
What does the QRS complex tell you in the a 3rd degree AV block regarding prognosis
Narrow QRS: Good prognosis
Wide QRS: Worse prognosis
Tx for a 3rd degree AV block
Pacer
Summarize 1st, 2nd, and 3rd degree heart blocks
1st degree: A p-wave is being conducted but slower than we would want. This is ok because every signal is making it through at a predictable manner, so no tx.
2nd degree: Most P-waves are being conducted
2nd degree Type I: QRS is dropped due to progressive elongation of PR intervals. This is in a predictable manner, so not as concerning. Tx is Atropine and Pacer
2nd degree Type II: QRS is dropped randomly, PR intervals are all the same size. Random pacing means poor perfusion. This needs to be tx with a pacer
3rd degree heart block: No p-waves are making it through, meaning conduction system is relying on AV node or ventricles, which is too slow to perfuse appropriately. Tx is pacer
What is the risk with Atrial Fibrilliation
The atrial are not contracting, so blood is stagnant there and CLOTS can form
What is the definitive tx for A.Fib
Catheter ablation to get rid of the accessory pathways
What is Ventricular Fibrillation
Ventricles are not contracting
No QRS
This is incompatible with life
Tx for V.Fib
Shock, Cardiovert
What is Torsades de Pointes and how do you treat.
Sin curve seen on EKG
Precursor to V.Fib if not tx
Tx: IV magnesium
What can you see with Torsades de Pointes on EKG
QT Prolongation
Sin-curve
What is Atrial Flutter. What do you see on EKG
When the atrium is contracting too quickly
Both Atrium and Ventricle contract
EKG: Saw-tooth waves, no P-waves
What is a risk with Atrial Flutter
Clots
TX for Atrial Flutter. Definitive Tx
Vagal maneuvers, CCB, Beta-Blockers
Definitive: Ablation
What is Wolff-Parkinson-White
Accessory signal present that is not allowing appropriate repolarization before the next depolarization signal comes through
What do you see on EKG with WPW
Delta Waves
What is a risk with WPW
Arrhythmia
What is happening in Supraventricular Tachycardia
A signal is coming from above the ventricles, so could be the AV node or the Atria
What do you see in SVT
Narrow QRS
Tx for SVT
Valsalva
Drugs: Beta-Blockers or CCB
They shut down the parasympatehtic conduction at AV node
What is the difference between ischemia and infarct and how do each look on an EKG
Ischemia: Tissue Obstruction. ST depressions
Infarct: Tissue Death. ST Elevation
What is a RBBB and what do you see on EKG
Delay in electrical signal at right side of bundle branch
See Wide Positive QRS in Leads V1, V2
What is LBBB and what do you see on EKG
Delay in electrical signal at left side of bundle branch
See Wide Negative QRS in leads V4-V6. Also see a notch or “fork” at the top of the QRS complex in V6
What do you see on EKG with LVH
Large QRS Complex (tall peaks)