Jaundice overview: Difference between revisions
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==Causes== | ==Causes== | ||
Common causes of jaundice are classified under conjugated and unconjugated hyperbilirubinemia. Unconjugated hyperbilirubinemia is caused by either increased bilirubin production in the body, impaired hepatic bilirubin uptake in the liver or impaired bilirubin uptake in the liver, all of which causes pooling of unconjugated bilirubin in the body leading to unconjugated hyperbilirubinemia. On the other hand, intra or extrahepatic cholestasis lead to accumulation of conjugated bilirubin causing conjugated hyperbilirubinemia. | |||
==Differential Diagnosis== | ==Differential Diagnosis== | ||
Revision as of 20:27, 7 February 2018
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
Jaundice is yellowish discoloration of the skin, conjunctiva (a clear covering over the sclera, or whites of the eyes) and mucous membranes caused by hyperbilirubinemia (increased levels of bilirubin in red blooded animals). Usually the concentration of bilirubin in the blood must exceed 2–3 mg/dL for the coloration to be easily visible.
Historical Perspective
Classification
Pathophysiology
Bilirubin is the catabolic product of the heme which is the main component of the red blood cells. Bilirubin is formed in the liver and spleen then it passes through several process in order to be metabolized. Metabolism processes include hepatic uptake, conjugation, clearance and excretion of the bilirubin in the bile. Jaundice develops due to increase the level of bilirubin and deposition under the skin and cause the yellow discoloration of the skin. Pathogenesis of neonatal jaundice includes physiologic process of bilirubin accumulation or pathological mechanism. The pathological jaundice may be acquired or inherited. Acquired neonatal jaundice include Rh hemolytic disease, ABO incompatibility disease, and hemolytic disease due to G6PD enzyme deficiency. Inherited neonatal jaundice is due to defect of one of the processes of bilirubin metabolism and it concludes some inherited syndromes. Inherited neonatal jaundice include Gilbert's syndrome, Crigler-Najjar syndrome type I and II, Lucey-Driscoll syndrome, Dubin-Johnson syndrome, and Rotor syndrome.
Causes
Common causes of jaundice are classified under conjugated and unconjugated hyperbilirubinemia. Unconjugated hyperbilirubinemia is caused by either increased bilirubin production in the body, impaired hepatic bilirubin uptake in the liver or impaired bilirubin uptake in the liver, all of which causes pooling of unconjugated bilirubin in the body leading to unconjugated hyperbilirubinemia. On the other hand, intra or extrahepatic cholestasis lead to accumulation of conjugated bilirubin causing conjugated hyperbilirubinemia.
Differential Diagnosis
Jaundice is yellowish discoloration of the skin, conjunctiva, and mucous membranes caused by hyperbilirubinemia. Usually, the concentration of bilirubin in the blood must exceed 2–3 mg/dL for the coloration to be easily visible. This page contains different causes of jaundice.
Epidemiology and Demographics
The incidence of jaundice is approximately 40,000 per 100,000 individuals of intensive care unit patients.Neonatal jaundice is more common among Asian and mixed Asian/white infants than white infants. Hepatocellular jaundice mainly from viral hepatitis commonly affects young patients. Cholestatic jaundice mainly from liver cancer, hepatitis, and liver cirrhosis commonly affects older patients.Male are more commonly affected by hepatocellular jaundice and liver cancer than female.Female are more commonly affected by hemolytic jaundice mainly from cholangiocarcinoma than male.
Risk Factors
Screening
There is insufficient evidence to recommend routine screening for jaundice.
Natural History, Complications, and Prognosis
Natural History
Complications
Prognosis
Diagnosis
History and Symptoms
Common symptoms of jaundice that the patient will notice, is yellowing of the skin, nausea, and vomiting. Specific symptoms will depend on the underlying factor that caused jaundice to occur. Patients may present with fever, anorexia, dark urine, fatigue, pruritis, right upper quadrant pain. A detailed history of alcohol use, blood transfusions, history of viral hepatitis and family history of liver disease must be taken in all patients.
Physical Examination
Jaundice is a yellowish discoloration of the skin and sclerae that is an important symptom of elevated serum bilirubin. Physical examination of patients with jaundice is based on underlying disease, include Cervical lymphadenopathy, hepatomegaly, splenomegaly, and Peripheral edema.
X-ray
There are no x-ray findings associated with jaundice.
CT
Abdominal CT scan may be helpful in the diagnosis of cirrhosis in patient with jaundice. Findings on CT scan suggestive of cirrhosis include cirrhotic liver, as shrinkage and atrophy in liver, dilated portal vein and/or splanchnic veins, esophageal varices, collaterals in any abdominal organ, splenomegaly, and ascites.
MRI
Abdominal MRI may be helpful in the diagnosis of jaundice caused by cirrhosis. Findings on MRI suggestive of cirrhosis include re-canalized umbilical vein, dilated portal vein and/or splanchnic veins, esophageal varices, collaterals in any abdominal organ, splenomegaly, and ascites.
Ultrasound
Ultrasonography may be helpful in the diagnosis of jaundice due to cirrhosis. Findings on an abdominal ultrasonography suggestive of cirrhosis include splenomegaly, ascites, re-canalization of umbilical vein -- pathognomonic of portal hypertension, and porto-systemic collaterals.
Other imaging studies
Endoscopic retrograde cholangiopancreatography (ERCP) is an alternative imaging modality for diagnosing the cause of cholestasis in patients with jaundice.
Other Diagnostic Studies
The gold standard diagnostic test for jaundice caused by cirrhosis is liver biopsy, although it is rarely necessary for diagnosis or treatment.
Treatment
Medical Therapy
The mainstay of treatment for jaundice is to conjugate the unconjugated bilirubin or excretion and clearance of bilirubin from the circulation. Jaundice is treated mainly through treating underlying diseases, such as viral hepatitis, alcoholic hepatitis, or cirrhosis.
Surgery
Surgery is not the first-line treatment option for patients with jaundice. Surgery is usually reserved for patients with either cirrhosis, cholestasis, and liver failure. The surgical procedures which are used to treat jaundice include transjugular intrahepatic portosystemic shunting (TIPS), cholecystectomy, and liver transplantation.