Jaundice

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Jaundice
Other namesIcterus [1]
Jaundice08.jpg
Jaundice of the skin caused by pancreatic cancer
Pronunciation
Specialty Gastroenterology, hepatology, general surgery
Symptoms Yellowish coloration of skin and sclera, itchiness [2] [3]
Causes High bilirubin levels [3]
Risk factors Pancreatic cancer, pancreatitis, liver disease, certain infections
Diagnostic method Blood bilirubin, liver panel [3]
Differential diagnosis Carotenemia, taking rifampin [4]
TreatmentBased on the underlying cause [5]

Jaundice, also known as icterus, is a yellowish or greenish pigmentation of the skin and sclera due to high bilirubin levels. [3] [6] Jaundice in adults is typically a sign indicating the presence of underlying diseases involving abnormal heme metabolism, liver dysfunction, or biliary-tract obstruction. [7] 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. [8] The most commonly associated symptoms of jaundice are itchiness, [2] pale feces, and dark urine. [4]

Contents

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. [4] [9] High blood bilirubin is divided into two types: unconjugated and conjugated bilirubin. [10]

Causes of jaundice vary from relatively benign to potentially fatal. [10] 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. [4] [10] High conjugated bilirubin may be due to liver diseases such as cirrhosis or hepatitis, infections, medications, or blockage of the bile duct, [4] due to factors including gallstones, cancer, or pancreatitis. [4] 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. [4]

Treatment of jaundice is typically determined by the underlying cause. [5] If a bile duct blockage is present, surgery is typically required; otherwise, management is medical. [5] Medical management may involve treating infectious causes and stopping medication that could be contributing to the jaundice. [5] 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). [9] The itchiness may be helped by draining the gallbladder, ursodeoxycholic acid, or opioid antagonists such as naltrexone. [2] The word jaundice is from the French jaunisse , meaning 'yellow disease'. [11] [12]

Signs and symptoms

A 4-year-old boy with icteric sclera due to G6PD deficiency 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 [13] with scleral icterus presence indicating a serum bilirubin of at least 3 mg/dl. [14] Other common signs include dark urine (bilirubinuria) and pale (acholia) fatty stool (steatorrhea). [15] Because bilirubin is a skin irritant, jaundice is commonly associated with severe itchiness. [16] [17]

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. [18]

A much less common sign of jaundice specifically during childhood is yellowish or greenish teeth. In developing children, hyperbilirubinemia may cause a yellow or green discoloration of teeth due to bilirubin deposition during the process of tooth calcification. [19] 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. [20]

Causes

Types of jaundice 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. [14] Jaundice is classified into three categories, depending on which part of the physiological mechanism the pathology affects. The three categories are:

CategoryDefinition
Prehepatic/hemolyticThe 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/hepatocellularThe pathology is due to damage of parenchymal liver cells.
Posthepatic/cholestaticThe pathology occurs after bilirubin conjugation in the liver, due to obstruction of the biliary tract and/or decreased bilirubin excretion.[ citation needed ]

Prehepatic causes

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. [21] These diseases may cause jaundice due to increased erythrocyte hemolysis: [22]

Hepatic causes

Microscopy of a biopsy of a cholestatic liver showing bilirubin pigment (brown pigment), H&E stain 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. [26] 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. [27] The following is a partial list of hepatic causes to jaundice: [28]

Posthepatic causes (Obstructive jaundice)

Posthepatic jaundice (obstructive jaundice) is caused by a blockage of bile ducts that transport bile containing conjugated bilirubin out of the liver for excretion. [29] This is a list of conditions that can cause posthepatic jaundice:

Pathophysiology

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.[ citation needed ]

Normal heme metabolism

Prehepatic metabolism

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. [31] 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. [31] 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.[ citation needed ]

Hepatic metabolism

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.[ citation needed ]

Posthepatic metabolism

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. [32] 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. [32]

Abnormalities in heme metabolism and excretion

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).[ citation needed ]

Prehepatic pathophysiology

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.[ citation needed ]

Hepatic pathophysiology

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. [33]

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. [34] [ clarification needed ]

Posthepatic pathophysiology

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. [35]

Diagnosis

Biliary-tract dilation due to obstruction as seen on CT scan (frontal plane) Obstructivebiliarydilation.png
Biliary-tract dilation due to obstruction as seen on CT scan (frontal plane)
Biliary-tract dilation due to obstruction as seen on CT scan (axial plane) 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). [36] 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. [37]

Laboratory tests

Prehepatic jaundiceHepatic jaundicePosthepatic jaundice
Total serum bilirubinNormal / increasedIncreasedIncreased
Conjugated bilirubinNormalIncreasedIncreased
Unconjugated bilirubinNormal / increasedIncreasedNormal
UrobilinogenNormal / increasedDecreasedDecreased / negative
Urine colorNormal [38] Dark (urobilinogen, conjugated bilirubin)Dark (conjugated bilirubin)
Stool colorBrownSlightly palePale, white
Alkaline phosphatase levelsNormalIncreasedHighly increased
Alanine transferase and aspartate transferase levelsHighly increasedIncreased
Conjugated bilirubin in urineNot presentPresentPresent

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.[ 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.[ citation needed ]

Laboratory findings depend on the cause of jaundice:

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. [39] 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. [40]

Imaging

Medical imaging such as ultrasound, CT scan, and HIDA scan are useful for detecting bile-duct blockage. [40]

Differential diagnosis

Treatment

Treatment of jaundice varies depending on the underlying cause. [5] If a bile duct blockage is present, surgery is typically required; otherwise, management is pharmacological. [5] [42] [43] [44]

Complications

Hyperbilirubinemia, more precisely hyperbilirubinemia due to the unconjugated fraction, may cause bilirubin to accumulate in the grey matter of the central nervous system, potentially causing irreversible neurological damage, leading to a condition known as kernicterus. Depending on the level of exposure, the effects range from unnoticeable to severe brain damage and even death. Newborns are especially vulnerable to hyperbilirubinemia-induced neurological damage, so must be carefully monitored for alterations in their serum bilirubin levels.[ citation needed ]

Individuals with parenchymal liver disease who have impaired hemostasis may develop bleeding problems. [45]

Epidemiology

Jaundice in adults is rare. [46] [47] [48] 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. [49] Jaundice is commonly associated with severity of disease with an incidence of up to 40% of patients requiring intensive care in ICU experiencing jaundice. [48] 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). [48]

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. [4]

Risk factors

Risk factors associated with high serum bilirubin levels include male gender, white ethnicities, and active smoking. [50] 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). [50] 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). [50] Bilirubin levels are higher in active smokers. [50]

Special populations

Neonatal jaundice

Symptoms

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. [51] 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).

Causes

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

Pathophysiology

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. [53] Jaundice in infants, as in adults, is characterized by increased bilirubin levels (infants: total serum bilirubin greater than 5 mg/dL).

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). [54] 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.[ citation needed ]

While most cases of newborn jaundice are not harmful, when bilirubin levels are very high, brain damage—kernicterus—may occur [55] [8] leading to significant disability. [56] 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.[ citation needed ]

Treatment

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. [9] 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. [57] [58] A 2014 systematic review found no evidence indicating whether outcomes were different for hospital-based versus home-based treatment. [59] 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. [60] There was not sufficient evidence to conclude that sunlight by itself is an effective treatment. [60] Bilirubin count is also lowered through excretion—bowel movements and urination—so frequent and effective feedings are vital measures to decrease jaundice in infants. [61]

Etymology

Jaundice comes from the French jaune, meaning 'yellow'; jaunisse meaning 'yellow disease'. The medical term is icterus, from the Greek word ikteros. [62] The term icterus is sometimes incorrectly used to refer to jaundice specifically of sclera. [62] [63] It is also referenced in the scientific name of the yellow-breasted chat (Icteria virens), whose sight was believed to cure jaundice. [64]

Related Research Articles

<span class="mw-page-title-main">Bilirubin</span> Red pigment of the bile

Bilirubin (BR) is a red-orange compound that occurs in the normal catabolic pathway that breaks down heme in vertebrates. This catabolism is a necessary process in the body's clearance of waste products that arise from the destruction of aged or abnormal red blood cells. In the first step of bilirubin synthesis, the heme molecule is stripped from the hemoglobin molecule. Heme then passes through various processes of porphyrin catabolism, which varies according to the region of the body in which the breakdown occurs. For example, the molecules excreted in the urine differ from those in the feces. The production of biliverdin from heme is the first major step in the catabolic pathway, after which the enzyme biliverdin reductase performs the second step, producing bilirubin from biliverdin.

Liver function tests, also referred to as a hepatic panel, are groups of blood tests that provide information about the state of a patient's liver. These tests include prothrombin time (PT/INR), activated partial thromboplastin time (aPTT), albumin, bilirubin, and others. The liver transaminases aspartate transaminase and alanine transaminase are useful biomarkers of liver injury in a patient with some degree of intact liver function.

<span class="mw-page-title-main">Stercobilin</span> Brown pigment of bile origin

Stercobilin is a tetrapyrrolic bile pigment and is one end-product of heme catabolism. It is the chemical responsible for the brown color of human feces and was originally isolated from feces in 1932. Stercobilin can be used as a marker for biochemical identification of fecal pollution levels in rivers.

<span class="mw-page-title-main">Kernicterus</span> Medical condition

Kernicterus is a bilirubin-induced brain dysfunction. The term was coined in 1904 by Christian Georg Schmorl. Bilirubin is a naturally occurring substance in the body of humans and many other animals, but it is neurotoxic when its concentration in the blood is too high, a condition known as hyperbilirubinemia. Hyperbilirubinemia may cause bilirubin to accumulate in the grey matter of the central nervous system, potentially causing irreversible neurological damage. Depending on the level of exposure, the effects range from clinically unnoticeable to severe brain damage and even death.

<span class="mw-page-title-main">Gilbert's syndrome</span> Medical condition

Gilbert syndrome (GS) is a syndrome in which the liver of affected individuals processes bilirubin more slowly than the majority. Many people never have symptoms. Occasionally jaundice may occur.

<span class="mw-page-title-main">Neonatal jaundice</span> Medical condition

Neonatal jaundice is a yellowish discoloration of the white part of the eyes and skin in a newborn baby due to high bilirubin levels. Other symptoms may include excess sleepiness or poor feeding. Complications may include seizures, cerebral palsy, or kernicterus.

<span class="mw-page-title-main">Cholestasis</span> Medical condition

Cholestasis is a condition where the flow of bile from the liver to the duodenum is impaired. The two basic distinctions are:

<span class="mw-page-title-main">Dubin–Johnson syndrome</span> Genetic liver disease

Dubin–Johnson syndrome is a rare, autosomal recessive, benign disorder that causes an isolated increase of conjugated bilirubin in the serum. Classically, the condition causes a black liver due to the deposition of a pigment similar to melanin. This condition is associated with a defect in the ability of hepatocytes to secrete conjugated bilirubin into the bile, and is similar to Rotor syndrome. It is usually asymptomatic, but may be diagnosed in early infancy based on laboratory tests. No treatment is usually needed.

<span class="mw-page-title-main">Urobilinogen</span> Chemical compound

Urobilinogen is a yellow by-product of bilirubin reduction. It is formed in the intestines by the bacterial enzyme bilirubin reductase. About half of the urobilinogen formed is reabsorbed and taken up via the portal vein to the liver, enters circulation and is excreted by the kidney.

<span class="mw-page-title-main">Crigler–Najjar syndrome</span> Rare inherited disorder affecting the metabolism of bilirubin

Crigler–Najjar syndrome is a rare inherited disorder affecting the metabolism of bilirubin, a chemical formed from the breakdown of the heme in red blood cells. The disorder results in a form of nonhemolytic jaundice, which results in high levels of unconjugated bilirubin and often leads to brain damage in infants. The disorder is inherited in an autosomal recessive manner. The annual incidence is estimated at 1 in 1,000,000.

<span class="mw-page-title-main">Urobilin</span> Yellow pigment in urine

Urobilin or urochrome is the chemical primarily responsible for the yellow color of urine. It is a linear tetrapyrrole compound that, along with the related colorless compound urobilinogen, are degradation products of the cyclic tetrapyrrole heme.

<span class="mw-page-title-main">Rotor syndrome</span> Medical condition

Rotor syndrome is a rare cause of mixed direct (conjugated) and indirect (unconjugated) hyperbilirubinemia, relatively benign, autosomal recessive bilirubin disorder characterized by non-hemolytic jaundice due to the chronic elevation of predominantly conjugated bilirubin.

<span class="mw-page-title-main">UDP glucuronosyltransferase 1 family, polypeptide A1</span> Enzyme found in humans

UDP-glucuronosyltransferase 1-1 also known as UGT-1A is an enzyme that in humans is encoded by the UGT1A1 gene.

Neonatal cholestasis refers to elevated levels of conjugated bilirubin identified in newborn infants within the first few months of life. Conjugated hyperbilirubinemia is clinically defined as >20% of total serum bilirubin or conjugated bilirubin concentration greater than 1.0 mg/dL regardless of total serum bilirubin concentration. The differential diagnosis for neonatal cholestasis can vary extensively. However, the underlying disease pathology is caused by improper transport and/or defects in excretion of bile from hepatocytes leading to an accumulation of conjugated bilirubin in the body. Generally, symptoms associated with neonatal cholestasis can vary based on the underlying cause of the disease. However, most infants affected will present with jaundice, scleral icterus, failure to thrive, acholic or pale stools, and dark urine.

<span class="mw-page-title-main">Bilirubinuria</span> Medical condition

In medicine, bilirubinuria is an abnormality in which conjugated bilirubin is detected in the urine.

<span class="mw-page-title-main">Urine test strip</span> Diagnostic tool used in urinalysis

A urine test strip or dipstick is a basic diagnostic tool used to determine pathological changes in a patient's urine in standard urinalysis.

Cholestatic pruritus is the sensation of itch due to nearly any liver disease, but the most commonly associated entities are primary biliary cholangitis, primary sclerosing cholangitis, obstructive choledocholithiasis, carcinoma of the bile duct, cholestasis, and chronic hepatitis C viral infection and other forms of viral hepatitis.

<span class="mw-page-title-main">Bilirubin glucuronide</span> Chemical compound

Bilirubin glucuronide is a water-soluble reaction intermediate over the process of conjugation of indirect bilirubin. Bilirubin glucuronide itself belongs to the category of conjugated bilirubin along with bilirubin di-glucuronide. However, only the latter one is primarily excreted into the bile in the normal setting.

Hemolytic jaundice, also known as prehepatic jaundice, is a type of jaundice arising from hemolysis or excessive destruction of red blood cells, when the byproduct bilirubin is not excreted by the hepatic cells quickly enough. Unless the patient is concurrently affected by hepatic dysfunctions or is experiencing hepatocellular damage, the liver does not contribute to this type of jaundice.

Hyperbilirubinemia is a clinical condition describing an elevation of blood bilirubin level due to the inability to properly metabolise or excrete bilirubin, a product of erythrocytes breakdown. In severe cases, it is manifested as jaundice, the yellowing of tissues like skin and the sclera when excess bilirubin deposits in them. The US records 52,500 jaundice patients annually. By definition, bilirubin concentration of greater than 3 mg/ml is considered hyperbilirubinemia, following which jaundice progressively develops and becomes apparent when plasma levels reach 20 mg/ml. Rather than a disease itself, hyperbilirubinemia is indicative of multifactorial underlying disorders that trace back to deviations from regular bilirubin metabolism. Diagnosis of hyperbilirubinemia depends on physical examination, urinalysis, serum tests, medical history and imaging to identify the cause. Genetic diseases, alcohol, pregnancy and hepatitis viruses affect the likelihood of hyperbilirubinemia. Causes of hyperbilirubinemia mainly arise from the liver. These include haemolytic anaemias, enzymatic disorders, liver damage and gallstones. Hyperbilirubinemia itself is often benign. Only in extreme cases does kernicterus, a type of brain injury, occur. Therapy for adult hyperbilirubinemia targets the underlying diseases but patients with jaundice often have poor outcomes.

References

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