[Exam 1] Chapter 29: Management of Patients with Complications from Heart Diseases (Page 818-833) Flashcards
What is heart failure?
Clinical syndrome resulting from structural or functional cardiac disorders that impair the ability of the ventricles to fill or eject blood
HF used to be referred as
congestive heart failure
Now, HF is recognized as a clinical lsyndrome characterized by signs and symptoms of
fluid overload or inadequate tissue perfusion.
Occurs when heart cannot generate CO sufficient to meet bodys demands.
HF is chronic, progressive condition that is managed with lifestyle changes and medications to prevent episodes of
acute decompensated heart failure, characterized by increased symptoms, decreased CO, and low perfusion
Two major types of HF are identified by
assessment of left ventricular function, usually echo-cardiogram
Most common type of HF is
alteration in ventricular contraction called systolic heart failure, which is characterized by weakened heart muscle
Second most common type of HF is
diastolic heart failure, which is cahracterized by a stiff and noncompliant heart muscle making it difficult for the ventricle to fill
How is EF calculated?
Subtracting the amount of blood present in the left ventricle at the end of systole from the amount present at the end of diastole and calculating the percentage of blood that is ejected
Normal EF is
55-65% of ventricular volume
EF is normal in what Hf?
Diastolic, known as heart failure with preversed EF
what is Heart Failure Class I
No limitation of physication
Ordinary activity does not cause undue fatigue
What is Heart Failure Class II
Slight limitation of physical activity
Comfortable at rest, but oridinary activity causes fatigue
What is Heart Failure Class III
Marked limitation of physical activity
Comfortable at rest, but less than ordinary activity causes fatigue
What is Heart Failure Class IV
Unable to carry out any physical activity
Symptoms of cardiac insufficiency at rest
What can cause Myocardial dysfunction and HF?
Coronary Artery Disease
Hypertension
Cardiomyopathy
Valvular Disorders
What is the primary cause of HF?
Atherosclerosis of the coronary arteries and coronary artery disease is found in the majority of patients with HF
Ischemia causes myocardial dysfunction because
it deprives heart cells of oxygen and causes cellular damage
What does MI cause?
focal heart muscle necrosis
death of myocardial cells
loss of contractility
What does sytemic or pulmonary hypertension do to the body?
Increases afterload, which increases cardiac workload and leads to hypertrophy of myocardial muscle fibers
What does sustained hypertension do?
Eventually leads to changes that impair the hearts ability to fill properly during diastole, and hypertrophied ventricles may dilate and fail
What is Cardiomyopathy?
Disease of the myocardium. Various types lead to HF and dysrhythmias.
Most common type of cardiomyopathy?
Dilated cardiomyopathy which causes diffuse myocyte necrosis and fibrosis and commonly leads to progressive HF
Dilated Cardiomyopathy can result from
an inflammatory process such as myocarditis or from a cytotoxic agent.
Criteria for Stage A HF?
Patients at high risk for developing left ventricular dysfunction but without structural heart disease
Treatment for Stage A HF
Heart healthy lifestyle
RF control of hypertension, lipids, diabetes, obesity
Criteria for Stage B HF?
Patients with left ventricular dysfunction or structural heart disease who have not developed symptoms of HF
Treatment for Stage B HF
Implement Stage A
Ace Inhibitor
Beta Blocker
Statins
Criteria for Stage C HF
Patients with left ventricular dysfunction or structural heart disease with current or prior symptoms of heart disease
Treatment for Stage C HF
Stage A/B
Diuretics
Aldosterone Antagonist
Sodium Restriction
Implantable Defribilator
Criteria for STage D HF
Patients with refractory end-stage HF requiring specialized interventions
Treatment for Stage D HF
A,B,C
Fluid restriction
End-of-life care
Extraoridnary measures
Inotropes
Cardiac Transplantion
Valvular heart disease is also a cause of HF. With Vascular dysfunction it becomes difficult to
move the blood forward, increasing pressure within the heart and increasing cardiac workload, leading to HF
What does cardiorenal syndrome describe?
How dysfunction in one of these systems leads to dysfunction in the other, resulting in increased morbidity and mortality
Significant myocardial dysfunction usually occurs before the patient experiences signs and symptoms of HF such a
shortness of breath, edema, or fatigue
As HF develops, body activtes what to fight back?
Neurohormonal comensatory mechanisms which represent bodys attempt to cope with the HF.
Systolic HF results blood doing what?
Decreased blood ejected from the ventricle
Sensed by baroreceptors. Sympathetic nervous sytem is then stimulated to release epinephrine and norepinephrine.
Purpose is to increase HR and contractility but has multiple negative effcts
Negative effects of epinephrine and norepinephrine cause what to the body?
Vasocontriction in the skin, GI Tract, Kidneys
Causes release of REnin to release Angiotensin II to increase blood pressure. Leads to fluid volume overload
When the cardiac chambers are overdistended, what is released?
ANP and BNP
Promote vasodilation and diuresis.
As the hearts worklkoad increases, contractility of the myocardial muscle fibers…
decreases
This results in an increase in end-diastolic blood volume in teh ventricle , stretching the myocardial muscle and increasing size of ventricles
Heart compensates for increased workload by
increasing the thickness of the heart muscle but leads to abnormal changes known as ventricular remodeling
Signs and Symptoms of HF related to
congestion and poor perfusion and the ventricle that is mosst affected
Left sided heart failure causes different manifesttions than
right-sided heart failure
Left-Sided Heart Failure: Pulmonary congestion occurs when
left ventricle cannot effectively pump blood out of the ventricle into the aorta and the systemic circulation
Increased volume increase pressure which decreases blood flow
Left-Sided Heart Failure: The blood volume and pressure build up in left atrium, decreasing
flow through the pulmonary veins into the left atrium . Pulmonary venous blood volume and pressure increase in the lungs, forcing fluid into pulmonary capilaries into pulmonary tissue and alveoli causing edema and impaired gas exchange
Left-Sided Heart Failure: Clinical manifestations of Pulmonary Congestion include
dyspnea, cough, pulmonary crackles, and low oxygen saturation levels
Left-Sided Heart Failure: Pulmonary Congestion and Heart Sounds
You may be able to hear S3
Left-Sided Heart Failure: With minimal to moderate activity, what may happen?
Dyspnea or shortness of breath
Left-Sided Heart Failure: Difficulty with Orthopnea, which is
difficulty breathing when lying flat.
Use pillows to prop themselves up in bed.
Left-Sided Heart Failure: SOme patients have Paroxysmal Noctural Dyspnea (PND) which is when
some patients have sudden attacks of dyspnea at night
Left-Sided Heart Failure: Problem with fluid that accumulates during the day and is reabsorbed at night?
LV cannot eject the increased circulating blood volume, the pressure in the pulmonary circulation increases , shifting fluid into the alveoli. Thus cannot exchange oxygen and CO2
Left-Sided Heart Failure: Cough with this is usually
Dry and nonproductive. Most complain of dry hacking cough that may be mislabed as asthma. Pink frothy sputum indicated acute decompensated HF with pulmonary edem
Left-Sided Heart Failure: Lung sounds
As it progresses, the crackles can be ausculted throughout the lung fields
Left-Sided Heart Failure: Amount of blood ejected from left ventricle decreases, leading to
inadequate tissue perfusion
Left-Sided Heart Failure: With a reduced CO and catecholamines decreases blood flow to the kidneys , urine output
drops.
Renal perfusion pressure falls nd RAAS is stimulated to increase blood pressure and intravascular volume.
Left-Sided Heart Failure: AS HF progresses, decreased output from left ventricle may cause other symptoms such ass
Decreased GI Perfusion
Decreased brain perfusion causes dizziness, lightheadness, confusion, restlessness, and anxiety due to decreased oxygen
Left-Sided Heart Failure: Decrease in SV causes the sympathetic nervous system to
increase the heart rate, often causing the patient to complain of palpitaitons
Right-Sided Heart Failure: When the right ventricle fails, congestion in the peripheral tissues and the viscera
predominates
Right-Sided Heart Failure: Peripheral tissues and viscerea predominates because
right side of the heart cannot eject blood effectively and cannot accommodate all of the blood that normally returns to it from the venous circulation
Right-Sided Heart Failure: Increased venous pressure leads to
jugular venous distention and increased capillary hydrostatic pressure throughout the venous system
Right-Sided Heart Failure: Systemic clinical manifestations include
edema of the lower extremities, hepatomegaly, ascites (accumulation of fluid in the perioneal cavity) and weight gain due to retention of fluid
Right-Sided Heart Failure: Edema usually affects
the feet and ankles and worsens when the patient stands or sits for a long period . Edema may decrease when patients elevate the legs
Right-Sided Heart Failure: Edema can progress to
The legs and thighs and eventually into the external genitalia and lower trunk
Right-Sided Heart Failure: Ascites evidenced by
increased abdominal girth and may accompany lower ody edema
Right-Sided Heart Failure: Sacral edema common on those who are on
bed rest, because sacral area is dependent