Download Askep CHF (Congestive Heart Failure)
Congestive Heart Failure (CHF)
Definition
Congestive heart failure (CHF) is an imbalance in pump function in which the heart fails to adequately maintain the circulation of blood. The most severe manifestation of CHF, pulmonary edema, develops when this imbalance causes an increase in lung fluid secondary to leakage from pulmonary capillaries into the interstitium and alveoli of the lung.
CHF can be categorized as forward or backward ventricular failure. Backward failure is secondary to elevated systemic venous pressure, whereas left ventricular failure is secondary to reduced forward flow into the aorta and systemic circulation. Furthermore, heart failure can be subdivided into systolic and diastolic dysfunction. Systolic dysfunction is characterized by a dilated left ventricle with impaired contractility, whereas diastolic dysfunction occurs in a normal or intact left ventricle with impaired ability to relax and receive as well as eject blood.
http://emedicine.medscape.com