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LIVER DISORDERS

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PROLONGED NEONATAL CHOLESTATIC JAUNDICE

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Key clinical features of disorders causing prolonged neonatal cholestasis are (1) jaundice with elevated serum conjugated (or direct) bilirubin fraction (> 2 mg/dL or > 20% of total bilirubin), (2) variably acholic stools, (3) dark urine, and (4) hepatomegaly.

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Prolonged neonatal cholestasis (conditions with decreased bile flow) is caused by both intrahepatic and extrahepatic diseases. Specific clinical clues (Table 22–1) distinguish these two major categories of jaundice in 85% of cases. Histologic examination of percutaneous liver biopsy specimens increases the accuracy of differentiation to 95% (Table 22–2).

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Table Graphic Jump Location
Table 22–1.   Characteristic clinical features of intrahepatic and extrahepatic neonatal cholestasis. 
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Table Graphic Jump Location
Table 22–2.   Characteristic histologic features of intrahepatic and extrahepatic neonatal cholestasis. 
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INTRAHEPATIC CHOLESTASIS

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ESSENTIALS OF DIAGNOSIS & TYPICAL FEATURES

  • Elevated total and conjugated bilirubin.

  • Hepatomegaly and dark urine.

  • Patency of extrahepatic biliary tree.

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General Considerations
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Intrahepatic cholestasis is characterized by impaired hepatocyte secretion of bile and patency of the extrahepatic biliary system. A specific cause can be identified in about 60% of cases. Patency of the extrahepatic biliary tract is suggested by pigmented stools and lack of bile duct proliferation and portal tract bile plugs on liver biopsy. It can be confirmed least invasively by hepatobiliary scintigraphy using technetium-99m (99mTc)-dimethyliminodiacetic acid (diethyl-IDA [DIDA]). Radioactivity in the bowel within 4–24 hours is evidence of bile duct patency, as is finding bilirubin in duodenal aspirates. However, these tests are rarely needed in the clinical setting. Patency can also be determined, when clinically indicated, by cholangiography carried out either intraoperatively, percutaneously by transhepatic cholecystography, or by endoscopic retrograde cholangiopancreatography (ERCP) using a pediatric-size side-viewing endoscope. Magnetic resonance cholangiopancreatography in infants is of limited use and highly dependent on the operator and equipment.

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1. Perinatal or Neonatal Hepatitis Resulting from Infection
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This diagnosis is considered in infants with jaundice, hepatomegaly, vomiting, lethargy, fever, and petechiae. It is important to identify perinatally acquired viral, bacterial, or protozoal infections (Table 22–3). Infection may occur transplacentally, by ascent through the cervix into ...

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