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The main pathophysiology of heart failure is a reduction in the efficiency of the heart muscle, through damage or overloading. As such, it can be caused by a wide number of conditions, including myocardial infarction (in which the heart muscle is starved of oxygen and dies), hypertension (which increases the force of contraction needed to pump blood) and cardiac amyloidosis (in which misfolded ...
Heart failure is not the same as cardiac arrest, in which blood flow stops completely due to the failure of the heart to pump. [12] [13] Diagnosis is based on symptoms, physical findings, and echocardiography. [6] Blood tests, and a chest x-ray may be useful to determine the underlying cause. [14] Treatment depends on severity and case. [15]
Pressure overload may affect any of the four chambers of the heart, though the term is most commonly applied to one of the two ventricles. Chronic pressure overload leads to concentric hypertrophy of the cardiac muscle, which can in turn lead to heart failure , myocardial ischaemia or, in extreme cases, outflow obstruction.
High-output heart failure is a heart condition that occurs when the cardiac output is higher than normal because of increased peripheral demand. There is a circulatory overload which may lead to pulmonary edema secondary to an elevated diastolic pressure in the left ventricle .
Heart failure with reduced ejection fraction (HFrEF, hef-REF) is a form of heart failure in which the ejection fraction is reduced. [1] This is defined as a left ventricular ejection fraction (LVEF) of 40% or less. About half of heart failure patients have a reduced ejection fraction. [2]
Moderate intensity exercise is defined as exercise that increases heart rate to 55-74% of maximum heart rate. [42] High intensity exercise increasing the heart rate to 70-100% of maximum heart rate for shorter intervals is at least as effective, and this type of exercise may increase oxygen uptake by the heart compared to moderate intensity ...
Cardiac symptoms of heart failure include chest pain/pressure and palpitations.Common noncardiac signs and symptoms of heart failure include loss of appetite, nausea, weight loss, bloating, fatigue, weakness, low urine output, waking up at night to urinate, and cerebral symptoms of varying severity, ranging from anxiety to memory impairment and confusion.
Heart failure, both with and without preserved ejection fraction, though through different mechanisms, result in an increase in left ventricular end-diastolic pressure (LVEDP). [7] Because CPP is measured by the difference in aortic and LVEDP pressures, an increase in LVEDP will decrease CPP.
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