NUR 1211C Chapter Notes - Chapter Test 3: Dilated Cardiomyopathy, Coronary Artery Disease, Cardiac Catheterization
8 Feb 2020
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Systolic failure, hfref, results from the inability of the heart to pump blood effectively. Normal ef is 55% to 60%; hfref less than 45% Caused by impaired contractile function, increased afterload (hypertension), cardiomyopathy, and mechanical abnormalities. The lv in systolic failure loses its ability to generate enough pressure to eject blood forward through the aorta. The weakened heart muscles cannot generate adequate stroke volume, which affects co. because the lv cannot effectively push blood forward, end diastolic volumes and pressures in the lv increase. When the lv fails, blood backs up into the left atrium. The increased pulmonary hydrostatic pressure causes fluid leakage from the pulmonary capillary bed into the interstitium and then the alveoli. This results in pulmonary congestion and edema: diastolic failure or heart failure with preserved ef. Diastolic failure, hfpef, is the inability of the ventricles to relax and fill during diastole. Hypertension is the most common cause of the diastolic failure.
