CONGESTIVE HEART FAILURE:
cardiac heart failure is a progressive clinical syndrome caused by the inability of the heart to pump sufficient blood to meet the body's metabolic needs .heart failure may be primarily due to systolic dysfunction or diastolic dysfunction.
ETIOLOGY AND PATHOPHYSIOLOGY:
Systolic dysfunction
Causes of systolic dysfunction(decreased contractility ) are reduced muscle mass, dilated cardiomyopathies, and ventricular hypertrophy .ventricular hypertrophy can be caused by pressure overload.or volume overload.
diastolic dysfunction:
The ventricular wall is thickened and unable to relax properly during diastole ventricular filling is impaired because of which output is low.it occurs in sustained hypertension, aortic stenosis, congenital heart disease, A-V Shunt, hypertrophic cardiomyopathy.
The leading cause of HF is coronary artery disease and hypertension.
Decreased cardiac output results in activation of compensatory responses to maintain circulation
1)tachycardia and increased contractility through sympathetic nervous system activation.
2)frank starling mechanism whereby increased preload increases stroke volume.
3)vasoconstriction.
4)ventricular hypertrophy and remodeling.
Although these compensatory mechanisms initially maintain cardiac function, they are responsu=ible for the symptoms of heart failure and contribute to disease progression.
SIGNS AND SYMPTOMS:
The patient presentation may range from asymptomatic to cardiogenic shock.
primary symptoms are dyspnea and fatique which lead to exercise intolerance.
other pulmonary symptoms include orthopnea, paroxysmal nocturnal dyspnoea, tachypnea, and cough.
fluid overload can result in pulmonary congestion and peripheral edema.
nonspecific symptoms include fatigue, nocturia,hemoptysis,abdominal pain,anorexia,nausea,bloating ,ascites,poor appetite or early satiety,mental status changes,and weight gain.
PHYSICAL ASSESSMENT :
Physical examination findings include:
pulmonary crackles, S3 gallop, cool extremities, Cheyne stokes respiration, tachycardia, narrow pulse pressure, cardiomegaly, symptoms of pulmonary edema(extreme breathlessness, and anxiety, sometimes with coughing and pink, frothy sputum), peripheral edema, jugular venous distention, hepatojugular reflux, and hepatomegaly.
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