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Pathophysiology of Heart Failure
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Increased Afterload
An increase in the resistance that the heart must pump against, which can lead to or exacerbate heart failure.
Arrhythmias
Irregular heartbeats can arise from heart failure, leading to a further decrease in cardiac efficiency and output.
Peripheral Edema
Fluid accumulation in the body tissues, often in the lower extremities, due to right-sided heart failure and venous congestion.
Neurohormonal Activation
Activation of systems like the renin-angiotensin-aldosterone system (RAAS) can lead to fluid retention, vasoconstriction, and further cardiac dysfunction.
Exercise Intolerance
Inability to perform physical activity due to reduced cardiac output, poor oxygenation, and fatigue associated with heart failure.
Diastolic Dysfunction
The heart's ability to relax and fill during diastole is impaired, causing increased filling pressures and symptoms of congestion.
Decreased Contractility
A reduction in the force with which the heart muscle contracts, diminishing cardiac output and tissue perfusion.
Ventricular Remodeling
Alterations in the size, shape, and function of the heart after injury, leading to further decline in cardiac function.
Systolic Dysfunction
The heart's ability to contract is impaired, leading to a decrease in ejection fraction and cardiac output.
Renal Insufficiency
The kidneys' function deteriorates due to diminished blood flow, which can trigger fluid retention and further worsen heart failure.
Increased Preload
Elevated venous pressure leads to increased ventricular filling and myocardial stretch, potentially worsening heart failure.
Cachexia
Severe weight loss and muscle wasting seen in advanced heart failure due to chronic inflammation and malnutrition.
Functional Mitral Regurgitation
Leakage of the mitral valve not due to valve defects but secondary to ventricular dilation and dysfunction in heart failure.
Pulmonary Edema
Fluid accumulation in the lungs due to elevated left ventricular filling pressures, resulting in shortness of breath and hypoxia.
Cyanosis
A bluish discoloration of the skin and mucous membranes due to low oxygen levels in the blood resulting from heart failure.
Endothelial Dysfunction
Impaired function of the blood vessel lining, leading to altered vasomotion and contribution to increased afterload.
Reduced Cardiac Output
Occurs when the heart can't pump enough blood to meet the body's needs, leading to fatigue and shortness of breath.
Myocardial Hypertrophy
The heart muscle thickens in response to increased workload, which can eventually lead to a stiff and less efficient heart.
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