heart failure “the inability of the heart to supply adequate blood flow and therefore oxygen...
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Heart Failure
“The inability of the heart to supply adequate blood flow and therefore oxygen delivery to peripheral tissues and organs”
Warwick Cardiology Society
http://www.cvphysiology.com/Heart%20Failure/HF002.htm
& Starling’s Law
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Learning Objectives 1• Understand how the pumping activity of the heart is
affected by changes in venous return and total peripheral resistance
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Quick review on Starling’s Law• Relation of venous return (and hence preload) to stroke volume (due to
force generation)– Stretch Sarcomere lengthening ↑ force generated ↑ SV– Length-tension and force-velocity relationships
• Note other non-Starling relationship (Trop C-calcium sensitivity due to increased sarcomere length)
• Not just one Starling curve – curve depends on ionotropy/afterload state– High afterload/decreased ionotropy Curve shifted down and R-wards– Low afterload/increased ionotropy Shifts curve up and leftwards
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Learning Objectives 2
• Explain the pathophysiology of heart failure• Describe the clinical characteristics of the principal types
of heart failure, and the circumstances which lead to its development
• Identify targets for drug action for the manipulation of cardiac output
• Describe the principles involved in the general management of heart failure, and the categories of drugs used in its therapy.
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• Principle types of heart failure & Circumstances for development
• Pathophysiology• Clinical characteristics• Principles of management• Categories of drugs and their targets
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HF types
Type CircumstanceAcute Hours/days
Low output state/decompensated CHF
MI, Ventricular septal rupture, IE ( Acute MR/AR), Sepsis, severe arrhythmias, valve dysfunction
Chronic Months/years
Associated w/ cardiac adaptive response to precipitating cause (e.g. CAD, congenital defects, valvular disease, arrhythmias etc)
Adaptive responses: e.g. hypertrophy, dilatation
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Type Circumstance
SystolicDiastolic
LeftRight
Biventricular
ForwardBackward
High OutputLow Output
Impaired ejection fraction (contractility)Impaired ventricular filling (stiffness)
Involves left side of the heartInvolves left side of the heart often due to LHF. If isolated, then due to cor pulmonale
Both sides
Unable to maintain adequate COUnable to accommodate venous return
HF due to demand for increased COHF associated with poor CO
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Pathophysiology
• Causes:– Intrinsic – e.g. dilated and hypertrophic
cardiomyopathies– Extrinsic – uncontrolled HTN, ↑SV, hormonal
(e.g. Hyperthyroidism), Pregnancy, Drugs (alcohol, cocaine)
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‘HEART FAILED’
• H – Hypertension• E – Endocarditis/environment (e.g. heat wave)• A – Anaemia• R – Rheumatic Heart Disease and other valvular disease• T - Thyrotoxicosis• F – Failure to take medications• A – Arrhythmia• I – Infection/Ischaemia/Infarction• L – Lung problems (PE, pneumonia, COPD)• E – Endocrine (Phaeochromocytoma, hyperaldosteronism)• D – Dietary indiscretions
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Pathophysiology cont…• Cardiac dysfunction changes to:
– Vascular function• Systolic and Diastolic
– Neurohumoral status• Vasoconstriction via:
– Sympathetics– R-A system– ADH– ANP
• Increases preload and afterload aggravate HF
– Blood volume• ↓ renal perfusion• Sympathetic adrenergic• RAAS• ADH• Relate to Venous pressure & oedema
Purpose:
Maintain cardiac output +
Arterial Blood Pressure
Some of these compensatory changes can worsen cardiac function
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Clinical Characteristics
Left Failure Right Failure
Low CO (Forward) FatigueSyncopeSystemic hypotensionCool extremitiesSlow capillary refillPeripheral cyanosisPulsus alternansMitral regurgitationS3 – 3rd heart sound; Ken-tucky
RHF can mimic most of the Sx of forward left heart failure if decreased RV output leads to LV underfilling
Venous Congestion (Backward)
DyspnoeaOrthopnoeaPNDCoughCrackles
Peripheral oedemaElevated JVP with AJR/HJR and Kussmaul’s signHepatomegalyPulsatile Liver
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• Others:• Ascites• Pleural effusion (excess fluid between 2 pleural layers)• Cardiac dilatation (increased ventricular end-diastolic
volume) or hypertrophy (increased end-systolic ventricular pressure)
• AF
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Management Principles
• Aim:– Improve QOL via symptomatic relief– Prevent hospital admission and reduce length
of stay of any admissions
• How:– Non-pharmacological– Pharmacological
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Non-pharmacological
• Lifestyle advice:– Smoking cessation– Low salt diet– Safe alcohol use– Weight loss for BMI >30– Exercise regimes– Secondary prevention for CAD– Once only pneumococcal vaccination and
annual Influenza vaccination
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Categories of drugs & targets
• Beta Blockers (-lols)• ACEi or ARBs (-prils, -sartans)• Digoxin• Aldosterone antagonists/K+ sparing
diuretics (Spironolactone, Eplerenone)• Loop diuretics (Furosemide/Bumetanide)• Stop/avoid aggravating drugs (nSAIDs,
Calcium antagonists, steroids, glitazones)
• Carvedilol, Bisoprolol, Metoprolol targets the SNS via B1 receptor and dampens activity
• Lisinopril, Ramipril target ACE and downregulates activity• Candesartan, Losartan, Valsartan target AT Receptor and
downregulates activity• Digoxin targets Na+/K+ pump in cardiomyocytes to indirectly
increase intracellular calcium• Aldosterone antagonists target MR to decrease aldosterone
binding• Loop diuretics target the loop of Henle to cause increased
diuresis
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RAAS
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Investigations• CXR (HERB-B)
• Heart enlargement• Pleural Effusion• Re-distribution (alveolar
oedema)• Kerley B-Lines• Bronchiolar-alveolar cuffing
• ECG– Likely abnormal
• Bloods– Anaemia, thyrotoxicosis etc,
BNP (re: V distension – hence 1st line test)
• ECHO– Underlying anatomical
problems (cardiomyopathy, valves, pericardial effusion)
• MRIoedematous
Bilateral effusions
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References
• http://www.cvphysiology.com/Heart%20Failure/HF002.htm
• Last year’s lecture by Dr Banerjee• Wikipedia (I know…naughty)• USMLE 2012• Toronto Notes 2012
Remember, a common cause of RHF is LHF!
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Questions?