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FOUNDATION OVERVIEW

Cystic fibrosis (CF) is a life-threatening genetic disease of the epithelial cells in the body, especially those lining the intestinal tract and airways of the lungs. Normally, epithelial cells transport chloride through the cystic fibrosis transmembrane regulator (CFTR) with sodium and water following the ion flux. CF is the loss of the function of the CFTR with defective movement of Cl and water in the body. Thus, the composition of fluid secreted by the pancreas, hepatobiliary tree, reproductive tract, sweat glands, and the airways is thick and leads to obstruction with malfunction. This malfunction eventually leads to widespread organ system disease (Table 47-1).

TABLE 47-1Organ System Effects of Cystic Fibrosis

Clinical presentation of CF patients is divided into early disease and disease later in life. Early disease is milder and later disease is advanced and severe. Early obstruction in the gastrointestinal system manifests as abdominal distention, pain, vomiting, and change in stool output. Early maldigestion, due to lipase deficiency, produces stools with high-fat content known as steatorrhea. Symptoms of steatorrhea are stools with foul odor, bulkiness, greasiness, and more frequent in number. Late maldigestion leads to varying degrees of malnutrition. Late pancreatic disease leads to insulin inefficiency known as cystic fibrosis-related diabetes (CFRD). Late disease in the biliary tract leads to obstruction and liver failure (Table 47-2).

TABLE 47-2Early Versus Late Disease in CF Patients

Pulmonary disease is also divided into early and late disease. Early obstruction in the pulmonary system leads to coughing, sputum production, wheezing, retractions, tachypnea, dyspnea, and cyanosis. Early pulmonary infection begins with a slow cycling pattern with well-being alternating with pulmonary deterioration known as exacerbations. Initial acute pulmonary exacerbations (APE) are primarily caused by Staphylococcus aureus, and subsequent infection is caused by Pseudomonas aeruginosa and MRSA. Late pulmonary disease leads to increasing oxygen requirements, digital clubbing, increased anterior-posterior chest diameter, and flattened diaphragm. The destruction of ...

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