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Jaundice

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Jaundice, also known as icterus, is a yellowish or greenish pigmentation of the skin and sclera due to high bilirubin levels.<ref name="NIH2016">Template:Cite book</ref><ref name="But2012">Template:Cite book</ref> Jaundice in adults is typically a sign indicating the presence of underlying diseases involving abnormal heme metabolism, liver dysfunction, or biliary-tract obstruction.<ref>Template:Cite book</ref> The prevalence of jaundice in adults is rare, while jaundice in babies is common, with an estimated 80% affected during their first week of life.<ref name="Kap2017">Template:Cite book</ref> The most commonly associated symptoms of jaundice are itchiness,<ref name="Bas2015">Template:Cite journal</ref> pale feces, and dark urine.<ref name="Rog2004" />

Normal levels of bilirubin in blood are below 1.0 mg/dl (17 μmol/L), while levels over 2–3 mg/dl (34–51 μmol/L) typically result in jaundice.<ref name=Rog2004>Template:Cite book</ref><ref name=CMAJ2015/> High blood bilirubin is divided into two types: unconjugated and conjugated bilirubin.<ref name=Win2011>Template:Cite journal</ref>

Causes of jaundice vary from relatively benign to potentially fatal.<ref name=Win2011/> High unconjugated bilirubin may be due to excess red blood cell breakdown, large bruises, genetic conditions such as Gilbert's syndrome, not eating for a prolonged period of time, newborn jaundice, or thyroid problems.<ref name=Rog2004/><ref name=Win2011/> High conjugated bilirubin may be due to liver diseases such as cirrhosis or hepatitis, infections, medications, or blockage of the bile duct,<ref name=Rog2004/> due to factors including gallstones, cancer, or pancreatitis.<ref name=Rog2004/> Other conditions can also cause yellowish skin, but are not jaundice, including carotenemia, which can develop from eating large amounts of foods containing carotene—or medications such as rifampin.<ref name="Rog2004" />

Treatment of jaundice is typically determined by the underlying cause.<ref name=Fer2014/> If a bile duct blockage is present, surgery is typically required; otherwise, management is medical.<ref name=Fer2014/> Medical management may involve treating infectious causes and stopping medication that could be contributing to the jaundice.<ref name=Fer2014>Template:Cite book</ref> Jaundice in newborns may be treated with phototherapy or exchanged transfusion depending on age and prematurity when the bilirubin is greater than 4–21 mg/dl (68–365 μmol/L).<ref name=CMAJ2015>Template:Cite journal</ref> The itchiness may be helped by draining the gallbladder, ursodeoxycholic acid, or opioid antagonists such as naltrexone.<ref name=Bas2015/> The word jaundice is from the French jaunisse, meaning 'yellow disease'.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>

Signs and symptomsEdit

File:Jaundice.jpg
A 4-year-old boy with icteric sclera due to G6PD deficiency

The most common signs of jaundice in adults are a yellowish discoloration of the white area of the eye (sclera) and skin,<ref>Template:Cite journal</ref> with scleral icterus presence indicating a serum bilirubin of at least 3 mg/dl.<ref name="Reuben_2012" /> Other common signs include dark urine (bilirubinuria) and pale (acholia) fatty stool (steatorrhea).<ref>Template:Cite book</ref> Because bilirubin is a skin irritant, jaundice is commonly associated with severe itchiness.<ref>Template:Cite book</ref><ref>Template:Cite journal</ref>

Eye conjunctiva has a particularly high affinity for bilirubin deposition due to high elastin content. Slight increases in serum bilirubin can, therefore, be detected early on by observing the yellowing of sclerae. Traditionally referred to as scleral icterus, this term is actually a misnomer, because bilirubin deposition technically occurs in the conjunctival membranes overlying the avascular sclera. Thus, the proper term for the yellowing of "white of the eyes" is conjunctival icterus.<ref>Template:Cite book</ref>

In individuals with darker skin tones, jaundice may be less readily apparent on the skin and is more reliably observed in areas such as the sclera, palms, soles, and oral mucosa. Educational resources have increasingly highlighted this variation to support accurate clinical assessment across diverse populations.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite journal</ref>

A rare sign of jaundice in childhood is the appearance of yellowish or greenish teeth. In developing children, hyperbilirubinemia can lead to yellow or green tooth discoloration as bilirubin deposits during tooth calcification.<ref>Template:Cite book</ref> While this may occur in children with hyperbilirubinemia, tooth discoloration due to hyperbilirubinemia is not observed in individuals with adult-onset liver disease. Disorders associated with a rise in serum levels of conjugated bilirubin during early development can also cause dental hypoplasia.<ref>Template:Cite journal</ref>

CausesEdit

File:Jaundice-types.png
Types of jaundice

Jaundice is a sign indicating the presence of an underlying diseases involving abnormal bilirubin metabolism, liver dysfunction, or biliary-tract obstruction. In general, jaundice is present when blood levels of bilirubin exceed 3 mg/dl.<ref name="Reuben_2012">Template:Cite book</ref> Jaundice is classified into three categories, depending on which part of the physiological mechanism the pathology affects. The three categories are:

Category Definition
Prehepatic/hemolytic The pathology occurs prior to the liver metabolism, due to either intrinsic causes to red blood cell rupture or extrinsic causes to red blood cell rupture.
Hepatic/hepatocellular The pathology is due to damage of parenchymal liver cells.
Posthepatic/cholestatic The pathology occurs after bilirubin conjugation in the liver, due to obstruction of the biliary tract and/or decreased bilirubin excretion.Template:Cn

Prehepatic causesEdit

Prehepatic jaundice is most commonly caused by a pathological increased rate of red blood cell (erythrocyte) hemolysis. The increased breakdown of erythrocytes → increased unconjugated serum bilirubin → increased deposition of unconjugated bilirubin into mucosal tissue.<ref>Template:Cite book</ref> These diseases may cause jaundice due to increased erythrocyte hemolysis:<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

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Hepatic causesEdit

File:Bilirubin pigment in cholestatic liver 40X.jpg
Microscopy of a biopsy of a cholestatic liver showing bilirubin pigment (brown pigment), H&E stain

Hepatic jaundice is caused by abnormal liver metabolism of bilirubin.<ref>Template:Cite book</ref> The major causes of hepatic jaundice are significant damage to hepatocytes due to infectious, drug/medication-induced, autoimmune etiology, or less commonly, due to inheritable genetic diseases.<ref>Template:Cite book</ref> The following is a partial list of hepatic causes to jaundice:<ref>Template:Cite book</ref>

Posthepatic causes (Obstructive jaundice)Edit

Posthepatic jaundice (obstructive jaundice) is caused by a blockage of bile ducts that transport bile containing conjugated bilirubin out of the liver for excretion.Template:Fact This is a list of conditions that can cause posthepatic jaundice:

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PathophysiologyEdit

File:Heme Breakdown.png

Jaundice is typically caused by an underlying pathological process that occurs at some point along the normal physiological pathway of heme metabolism. A deeper understanding of the anatomical flow of normal heme metabolism is essential to appreciate the importance of prehepatic, hepatic, and posthepatic categories. Thus, an anatomical approach to heme metabolism precedes a discussion of the pathophysiology of jaundice.Template:Citation needed

Normal heme metabolismEdit

Prehepatic metabolismEdit

When red blood cells complete their lifespan of about 120 days, or if they are damaged, they rupture as they pass through the reticuloendothelial system, and cell contents including hemoglobin are released into circulation. Macrophages phagocytose free hemoglobin and split it into heme and globin. Two reactions then take place with the heme molecule. The first oxidation reaction is catalyzed by the microsomal enzyme heme oxygenase and results in biliverdin (green color pigment), iron, and carbon monoxide. The next step is the reduction of biliverdin to a yellow color tetrapyrrole pigment called bilirubin by cytosolic enzyme biliverdin reductase. This bilirubin is "unconjugated", "free", or "indirect" bilirubin. Around 4 mg of bilirubin per kg of blood are produced each day.<ref name="PedRev">Template:Cite journal</ref> The majority of this bilirubin comes from the breakdown of heme from expired red blood cells in the process just described. Roughly 20% comes from other heme sources, however, including ineffective erythropoiesis, and the breakdown of other heme-containing proteins, such as muscle myoglobin and cytochromes.<ref name="PedRev" /> The unconjugated bilirubin then travels to the liver through the bloodstream. Because this bilirubin is not soluble, it is transported through the blood bound to serum albumin.Template:Citation needed

Hepatic metabolismEdit

Once unconjugated bilirubin arrives in the liver, liver enzyme UDP-glucuronyl transferase conjugates bilirubin + glucuronic acid → bilirubin diglucuronide (conjugated bilirubin). Bilirubin that has been conjugated by the liver is water-soluble and excreted into the gallbladder.Template:Citation needed

Posthepatic metabolismEdit

Bilirubin enters the intestinal tract via bile. In the intestinal tract, bilirubin is converted into urobilinogen by symbiotic intestinal bacteria. Most urobilinogen is converted into stercobilinogen and further oxidized into stercobilin. Stercobilin is excreted via feces, giving stool its characteristic brown coloration.<ref name="Berthelot_2018">Template:Cite book</ref> A small portion of urobilinogen is reabsorbed back into the gastrointestinal cells. Most reabsorbed urobilinogen undergoes hepatobiliary recirculation. A smaller portion of reabsorbed urobilinogen is filtered into the kidneys. In the urine, urobilinogen is converted to urobilin, which gives urine its characteristic yellow color.<ref name="Berthelot_2018" />

Abnormalities in heme metabolism and excretionEdit

One way to understand jaundice pathophysiology is to organize it into disorders that cause increased bilirubin production (abnormal heme metabolism) or decreased bilirubin excretion (abnormal heme excretion).Template:Citation needed

Prehepatic pathophysiologyEdit

Prehepatic jaundice results from a pathological increase in bilirubin production: an increased rate of erythrocyte hemolysis causes increased bilirubin production, leading to increased deposition of bilirubin in mucosal tissues and the appearance of a yellow hue.Template:Citation needed

Hepatic pathophysiologyEdit

Hepatic jaundice (hepatocellular jaundice) is due to significant disruption of liver function, leading to hepatic cell death and necrosis and impaired bilirubin transport across hepatocytes. Bilirubin transport across hepatocytes may be impaired at any point between hepatocellular uptake of unconjugated bilirubin and hepatocellular transport of conjugated bilirubin into the gallbladder. In addition, subsequent cellular edema due to inflammation causes mechanical obstruction of the intrahepatic biliary tract. Most commonly, interferences in all three major steps of bilirubin metabolism—uptake, conjugation, and excretion—usually occur in hepatocellular jaundice. Thus, an abnormal rise in both unconjugated and conjugated bilirubin (formerly called cholemia) will be present. Because excretion (the rate-limiting step) is usually impaired to the greatest extent, conjugated hyperbilirubinemia predominates.<ref>Template:Cite book</ref>

The unconjugated bilirubin still enters the liver cells and becomes conjugated in the usual way. This conjugated bilirubin is then returned to the blood, probably by rupture of the congested bile canaliculi and direct emptying of the bile into the lymph exiting the liver. Thus, most of the bilirubin in the plasma becomes the conjugated type rather than the unconjugated type, and this conjugated bilirubin, which did not go to the intestine to become urobilinogen, gives the urine a dark color.<ref>Template:Cite book</ref>Template:What

Posthepatic pathophysiologyEdit

Posthepatic jaundice, also called obstructive jaundice, is due to the blockage of bile excretion from the biliary tract, which leads to increased conjugated bilirubin and bile salts there. In complete obstruction of the bile duct, conjugated bilirubin cannot access the intestinal tract, disrupting further bilirubin conversion to urobilinogen and, therefore, no stercobilin or urobilin is produced. In obstructive jaundice, excess conjugated bilirubin is filtered into the urine without urobilinogen. Conjugated bilirubin in urine (bilirubinuria) gives urine an abnormally dark brown color. Thus, the presence of pale stool (stercobilin absent from feces) and dark urine (conjugated bilirubin present in urine) suggests an obstructive cause of jaundice. Because these associated signs are also positive in many hepatic jaundice conditions, they cannot be a reliable clinical feature to distinguish obstructive versus hepatocellular jaundice causes.<ref>Template:Cite journal</ref>

DiagnosisEdit

File:Obstructivebiliarydilation.png
Biliary-tract dilation due to obstruction as seen on CT scan (frontal plane)
File:Obstructivebiliarydilation2.png
Biliary-tract dilation due to obstruction as seen on CT scan (axial plane)

Most people presenting with jaundice have various predictable patterns of liver panel abnormalities, though significant variation does exist. The typical liver panel includes blood levels of enzymes found primarily from the liver, such as the aminotransferases (ALT, AST), and alkaline phosphatase (ALP); bilirubin (which causes the jaundice); and protein levels, specifically, total protein and albumin. Other primary lab tests for liver function include gamma glutamyl transpeptidase (GGT) and prothrombin time (PT).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> No single test can differentiate between various classifications of jaundice. A combination of liver function tests and other physical examination findings is essential to arrive at a diagnosis.<ref>Template:Cite journal</ref>

Laboratory testsEdit

Prehepatic jaundice Hepatic jaundice Posthepatic jaundice
Total serum bilirubin Normal / increased Increased Increased
Conjugated bilirubin Normal Increased Increased
Unconjugated bilirubin Normal / increased Increased Normal
Urobilinogen Normal / increased Decreased Decreased / negative
Urine color Normal<ref>Template:Cite book</ref> Dark (urobilinogen, conjugated bilirubin) Dark (conjugated bilirubin)
Stool color Brown Slightly pale Pale, white
Alkaline phosphatase levels Normal Increased Highly increased
Alanine transferase and aspartate transferase levels Highly increased Increased
Conjugated bilirubin in urine Not present Present Present

Some bone and heart disorders can lead to an increase in ALP and the aminotransferases, so the first step in differentiating these from liver problems is to compare the levels of GGT, which are only elevated in liver-specific conditions. The second step is distinguishing from biliary (cholestatic) or liver causes of jaundice and altered laboratory results. ALP and GGT levels typically rise with one pattern while aspartate aminotransferase (AST) and alanine aminotransferase (ALT) rise in a separate pattern. If the ALP (10–45 IU/L) and GGT (18–85 IU/L) levels rise proportionately as high as the AST (12–38 IU/L) and ALT (10–45 IU/L) levels, this indicates a cholestatic problem. If the AST and ALT rise is significantly higher than the ALP and GGT rise, though, this indicates a liver problem. Finally, distinguishing between liver causes of jaundice, comparing levels of AST and ALT can prove useful. AST levels typically are higher than ALT. This remains the case in most liver disorders except for hepatitis (viral or hepatotoxic). Alcoholic liver damage may have fairly normal ALT levels, with AST 10 times higher than ALT. If ALT is higher than AST, however, this is indicative of hepatitis. Levels of ALT and AST are not well correlated to the extent of liver damage, although rapid drops in these levels from very high levels can indicate severe necrosis. Low levels of albumin tend to indicate a chronic condition, while the level is normal in hepatitis and cholestasis.Template:Citation needed

Laboratory results for liver panels are frequently compared by the magnitude of their differences, not the pure number, as well as by their ratios. The AST:ALT ratio can be a good indicator of whether the disorder is alcoholic liver damage (above 10), some other form of liver damage (above 1), or hepatitis (less than 1). Bilirubin levels greater than 10 times normal could indicate neoplastic or intrahepatic cholestasis. Levels lower than this tend to indicate hepatocellular causes. AST levels greater than 15 times normal tend to indicate acute hepatocellular damage. Less than this tend to indicate obstructive causes. ALP levels greater than 5 times normal tend to indicate obstruction, while levels greater than 10 times normal can indicate drug (toxin) induced cholestatic hepatitis or cytomegalovirus infection. Both of these conditions can also have ALT and AST greater than 20 times normal. GGT levels greater than 10 times normal typically indicate cholestasis. Levels 5–10 times tend to indicate viral hepatitis. Levels less than 5 times normal tend to indicate drug toxicity. Acute hepatitis typically has ALT and AST levels rising 20–30 times normal (above 1000) and may remain significantly elevated for several weeks. Acetaminophen toxicity can result in ALT and AST levels greater than 50 times than normal.Template:Citation needed

Laboratory findings depend on the cause of jaundice:

  • Urine: conjugated bilirubin present, urobilinogen > 2 units but variable (except in children)
  • Plasma proteins show characteristic changes.
  • Plasma albumin level is low, but plasma globulins are raised due to an increased formation of antibodies.

Unconjugated bilirubin is hydrophobic, so cannot be excreted in urine. Thus, the finding of increased urobilinogen in the urine without the presence of bilirubin in the urine (due to its unconjugated state) suggests hemolytic jaundice as the underlying disease process.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Urobilinogen will be greater than 2 units, as hemolytic anemia causes increased heme metabolism; one exception being the case of infants, where the gut flora has not developed). Conversely, conjugated bilirubin is hydrophilic and thus can be detected as present in the urine—bilirubinuria—in contrast to unconjugated bilirubin, which is absent in the urine.<ref name="AFP2004">Template:Cite journal</ref>

ImagingEdit

Medical imaging such as ultrasound, CT scan, and HIDA scan are useful for detecting bile-duct blockage.<ref name="AFP2004" />

Differential diagnosisEdit

TreatmentEdit

Treatment of jaundice varies depending on the underlying cause.<ref name="Fer2014" /> If a bile duct blockage is present, surgery is typically required; otherwise, management is pharmacological.<ref name="Fer2014" /><ref>Template:Cite journal</ref><ref>Template:Cite book</ref><ref>Template:Cite journal</ref>

EpidemiologyEdit

Jaundice in adults is rare.<ref>Template:Cite book</ref><ref>Template:Cite journal</ref><ref name="Bansal_2006">Template:Cite journal</ref> Under the five year DISCOVERY programme in the UK, annual incidence of jaundice was 0.74 per 1000 individuals over age 45, although this rate may be slightly inflated due to the main goal of the programme collecting and analyzing cancer data in the population.<ref>Template:Cite journal</ref> Jaundice is commonly associated with severity of disease with an incidence of up to 40% of patients requiring intensive care in ICU experiencing jaundice.<ref name="Bansal_2006" /> The causes of jaundice in the intensive care setting is both due to jaundice as the primary reason for ICU stay or as a morbidity to an underlying disease (i.e. sepsis).<ref name="Bansal_2006" />

In the developed world, the most common causes of jaundice are blockage of the bile duct or medication-induced. In the developing world, the most common cause of jaundice is infectious such as viral hepatitis, leptospirosis, schistosomiasis, or malaria.<ref name="Rog2004" />

Risk factorsEdit

Risk factors associated with high serum bilirubin levels include male gender, white ethnicities, and active smoking.<ref name="Zucker 827–835">Template:Cite journal</ref> Mean serum total bilirubin levels in adults were found to be higher in men (0.72 ± 0.004 mg/dl) than women (0.52 ± 0.003 mg/dl).<ref name="Zucker 827–835" /> Higher bilirubin levels in adults are found also in non-Hispanic white population (0.63 ± 0.004 mg/dl) and Mexican American population (0.61 ± 0.005 mg/dl) while lower in non-Hispanic black population (0.55 ± 0.005 mg/dl).<ref name="Zucker 827–835" /> Bilirubin levels are higher in active smokers.<ref name="Zucker 827–835" />

Special populationsEdit

Neonatal jaundiceEdit

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SymptomsEdit

Jaundice in infants presents with yellowed skin and icteral sclerae. Neonatal jaundice spreads in a cephalocaudal pattern, affecting the face and neck before spreading down to the trunk and lower extremities in more severe cases.<ref>Template:Cite book</ref> Other symptoms may include drowsiness, poor feeding, and in severe cases, unconjugated bilirubin can cross the blood-brain barrier and cause permanent neurological damage (kernicterus).

CausesEdit

The most common cause of jaundice in infants is normal physiologic jaundice. Pathologic causes of neonatal jaundice include:

PathophysiologyEdit

Transient neonatal jaundice is one of the most common conditions occurring in newborns (children under 28 days of age) with more than 80 per cent experienceing jaundice during their first week of life.<ref>Template:Cite journal</ref> Jaundice in infants, as in adults, is characterized by increased bilirubin levels (infants: total serum bilirubin greater than 5 mg/dL).Template:Cn

Normal physiological neonatal jaundice is due to immaturity of liver enzymes involved in bilirubin metabolism, immature gut microbiota, and increased breakdown of fetal hemoglobin (HbF).<ref>Template:Cite bookTemplate:Page needed</ref> Breast milk jaundice is caused by an increased concentration of β-glucuronidase in breast milk, which increases bilirubin deconjugation and reabsorption of bilirubin, leading to persistence of physiologic jaundice with unconjugated hyperbilirubinemia. Onset of breast milk jaundice is within 2 weeks after birth and lasts for 4–13 weeks.Template:Cn

While most cases of newborn jaundice are not harmful, when bilirubin levels are very high, brain damage—kernicterus—may occur<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="Kap2017" /> leading to significant disability.<ref name="family">Template:Cite journal</ref> Kernicterus is associated with increased unconjugated bilirubin (bilirubin which is not carried by albumin). Newborns are especially vulnerable to this damage, due to increased permeability of the blood–brain barrier occurring with increased unconjugated bilirubin, simultaneous to the breakdown of fetal hemoglobin and the immaturity of gut flora. This condition has been rising in recent years, as babies spend less time in sunlight.Template:Citation needed

TreatmentEdit

Jaundice in newborns is usually transient and dissipates without medical intervention. In cases when serum bilirubin levels are greater than 4–21 mg/dl (68–360 μmol/L), infant may be treated with phototherapy or exchanged transfusion depending on the infant's age and prematurity status.<ref name="CMAJ2015" /> A bili light is often the tool used for early treatment, which consists of exposing the baby to intensive phototherapy, which may be intermittent or continuous.<ref>Template:Cite journal</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> A 2014 systematic review found no evidence indicating whether outcomes were different for hospital-based versus home-based treatment.<ref>Template:Cite journal</ref> A 2021 Cochrane systematic review found that sunlight can be used to supplement phototherapy, as long as care is taken to prevent overheating and skin damage.<ref name="Horn_2021">Template:Cite journal</ref> There was not sufficient evidence to conclude that sunlight by itself is an effective treatment.<ref name="Horn_2021" /> Bilirubin count is also lowered through excretion—bowel movements and urination—so frequent and effective feedings are vital measures to decrease jaundice in infants.<ref>Template:Cite journal</ref>

EtymologyEdit

Jaundice comes from the French {{#invoke:Lang|lang}}, meaning 'yellow'; {{#invoke:Lang|lang}} meaning 'yellow disease'. The medical term is icterus, from the Greek word {{#invoke:Lang|lang}}.<ref name="medicinenet">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The term icterus is sometimes incorrectly used to refer to jaundice specifically of sclera.<ref name="medicinenet" /><ref>Icterus | Define Icterus at Dictionary.com Template:Webarchive. Dictionary.reference.com. Retrieved on 2013-12-23.</ref> It is also referenced in the scientific name of the yellow-breasted chat (Icteria virens), whose sight was believed to cure jaundice.<ref>Template:Cite journal</ref>

ReferencesEdit

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Further readingEdit

External linksEdit

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