Heart failure Flashcards
What is Heart failure ?
Congestive heart failure
Inability of heart to pump blood to meet metabolic demand of the body.
2 types
Systolic heart failure
0 Ventricles cannot pump hard enough during systole
0 Diastolic heart failure - not enough filling of ventricles during diastole.
Can either be:
o left side
o right sided
o biventricular
left sided can cause right sided vice versa
as one side impacts the other - In this case it is whatever side came first.
O lefts sided most common
CONSQEUNCE
- Blood backs up into lungs causing fluid build up - pulmonary oedema
What is stroke volume ?
How do you calculate Cardiac output ?
What is the ejection fraction ?
- normal ?
- abnormal ?
SV - Volume of blood pump out of left ventricles per beat / systolic contraction
CO = SV X HR
Ejection fraction - measurement of the amount of blood leaving LV vs total volume in LV - expressed as a precentage
e.g total volume - 110 , SV - 70
EF = 70 / 110 ML = 64 %
Normal - 50 -70 %
40 - 50 % - borderline
Below 40 - systolic Heart failure - on pumping out a little blood each beat.
How does Systolic heart failure impact EF , EDV , EDP ?
SHF ————————-> LV cannot pump as hard ( decreased contractility - ability to contract ) ——————-> SV decreased ———————> Cardiac output decreased.
EF = SV / TV
(decreased EF - Top number decreased ) - Heart failure with reduced ejection fraction.
EDV - amount of blood in ventricle at the end of diastole. ( LEDV - Left ventricle - REDV - right V )
(LEDV = Leftover blood (which was not ejected ) + blood from lungs )
- high - more left over blood after systole ( so more in LV in diastole )
EDP - end diastolic pressure - HIGH
( Higher volume in ventricle - higher pressure )
Causes of systolic heart failure
or ischemic Heart disease due to Atherosclerosis - plaque build ( blocks blood supply , cells die )
Ischemia after MI (heart attack - BV completely blocked ———————> No blood ——————–> myocardium damaged ———————–> scar tissue —————–> cant contract with same force)
o Decreased
contractility
0 Hypertension ————– LV hypertrophy ——————> O2 demand increases (increased muscle ) + Reduced 02 demand (compression of cardiac vessels ) = weaker contractions
0 Dilated cardiomyopathy - chamber get bigger —————–> ventricle wall thin out (too thin ) —————-> weakened - cannot pump hard enough
( Frank starling - at first increased chamber size ————–> increased preload (more filling) ————–> increased volume = greater contraction strength ———–> but not sustainable
- Systolic heart failure - often the cause of Left sided heart failure
How does Diastolic heart failure effect EF , EDV , ECF ?
EF - normal
( even though stroke volume is low - Total volume is also low - because issue with not enough blood filling the ventricle ) -so fraction evens out
EX - SV - 70ml , TV - 110 ml
-normal 70 / 110 = 64 %
SHF - SV - 44 ml , TV - 110 ml = 40 %
DHF - SV - 44ml , 69 ml
44/69 = 64 % -HEART FAILURE WITH PRESERVED EJECTION FRACTION.
EDV - normal in beginning , then reduced by the end
EDP - is elevated
Causes of Left sided HF - Diastolic heart failure ?
Ventricular hypertrophy - ventricular wall gets thicker ( concentric hypertrophy - crowds into chamber space ) ——————-< ventricle less able to stretch ————–> fills less.
Long standing hypertension —————–> (concentric )V hypertrophy
Aortic Stenosis (narrowing of aortic valve )——————> Concentric Hypertrophy
Genetic - Hypertrophic cardiomyopathy —————————- > abnormal thickening of V wall
Restrictive cardiomyopathy —————-> Stiff ventricle wall (less stress )———-> reduced filling capacity
Symptoms of Left sided heart failure ?
0 Pulmonary oedema ( very important ) ———————-> Dyspnoea (trouble breathing )———————-> CRACKLES (heard on auscultation
Orthopnoea - difficulty breathing when lying down.
( lying down ———–> venous return increases ———> heart has to deal with more blood ———–> worsen SHF)
0 Orthopnoea ———————-> * Paroxysmal nocturnal dyspnoea ( not be able to breath wakes them up at night ————————> may sleep with more pillows to keep body elevated.
0 Fatigue
SHF ———-> reduced CO ———–> not enough blood to organs
o reduced blood flow to kidney —————> RAAS activation ——————–> aldosterone production ——————> increased reabsorption of NA / h20 ——————–> Fluid retention ————–> worsens pulmonary oedema & causes peripheral oedema ( legs etc )
0 Pitting oedema
0 sympathetic nervous system activation ——————— reduced CO ————–> SNV activation ————— >Activates RAAS (worsens fluid retention )
S3 /S4 extra heart sound.
Symptoms of Right sided heart failure ?
0 Chronic lung disease -
Chronic lung disease ——————> difficult gas exchange / 02 exchange——————–> Hypoxia ———————> vasoconstriction of arteries in lung—————————> pulmonary blood pressure rise ——————> harder for right side of heart to pump against ————————–> Hypertrophy ——————> reduced filling capacity —————-> cant contract as well ——————> failure
(Dyspnea )
FLUID RETENTION
0 congestion in veins
- blood backs up to body ———————–> IJV distention/ enlarged ———————> hepatomegaly ( congestive hepatopathy - in this case ) ——————– cardiac cirrhosis & liver failure
2. Splenomegaly
3. Ascities
( Liver - nutmeg liver - dark spots where veins enlarged )
0 Pitting oedema
0 blood sample - Haemosiderin laden macrophages / heart failure cells ———–> blood leaks into alveoli ———————-> macrophages digest these —————–> turn brown colour (iron build up )
0 Arrhythmia ( can happen in both L & R ) - heart cells get irritated by thinning or thickening of V wall.
Most common cause of Right sided Heart failure ?
Left sided heart failure
LSHF ———————-> back of blood to lungs ———————–> increased pressure in pulmonary artery ————————> right ventricle has to pump harder against the pressure
Treatment of Heart failure ?
ACE
ARB
Aldosterone receptor antagonists
Spironolactone
Beta blockers - beware in decompensated HF - rapidly worsens (BB decrease HR ,a
Carvedilol , bisoprolol
Metoprolol
Neprilysin inhibitors - neprilysin - enzymes - breaks down peptides which promote urine sodium excretion & vasodilation.
0 Thiazide / loop diuretics
0 Hydralazine & Nitrates
- VAD - ventricular assist device
Heart transplant - end stage - nothing worked.
- Cardiac resynchronisation therapy
Causes of Right sided heart failure ?
Atrial / ventricular septal defect - shunt form left atrium/ ventricle to right————————–> increased right fluid volume ——————-> Hypertrophy —————–> prone to ischemia —————–> (SHF ) or smaller V chamber size (DHF )
0 Chronic lung diseases -COR POLMONAE - when lung conditions cause RSHF .
Typical symptoms of HF - CKS
0 Breathlessness — on exertion, at rest, on lying flat (orthopnoea), nocturnal cough, or waking from sleep (paroxysmal nocturnal dyspnoea).
0 Fluid retention (ankle swelling, bloated feeling, abdominal swelling, or weight gain).
0 Fatigue, decreased exercise tolerance, or increased recovery time after exercise.
0 Light headedness or history of syncope.
Risk factors
0 Coronary heart disease
0 previous history of MI , Hypertension , atrial Fib , Diabetes
0 Family history of HF or sudden cardiac death
0 Drugs & alcohol
What would you examine for if HF suspected
0 Tachycardia (heart rate over 100 beats per minute) and pulse rhythm.
0 A laterally displaced apex beat,
o heart murmurs
o third or fourth heart sounds (gallop rhythm).
0 Hypertension.
0 Raised jugular venous pressure.
0 Enlarged liver (due to engorgement).
0 Respiratory signs
o
tachypnoea,
o basal
crepitations,
o pleural
effusions.
0 Dependent oedema (legs, sacrum), ascites.
0 Obesity.
Management of suspected HF ?
0 Review medication - reduce /stop any that could worsen HF
Sufficiently severe symptoms - give loop diuretic
o Furosemide 20–40 mg daily.
o Bumetanide 0.5–1.0 mg daily.
o Torasemide 5–10 mg daily.
if higher dose needed - check adherence - check alternative causes
