Pancreatitis

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Pancreatitis
Illu pancrease.svg
The pancreas and surrounding organs
Specialty
Symptoms
Complications Infection, bleeding, diabetes mellitus, [1] pancreatic cancer, kidney failure, breathing problems, malnutrition [2]
DurationShort or long term [1]
Causes
Risk factors Smoking [3] [4]
Diagnostic method Based on symptoms, blood amylase or lipase [5] [1]
Treatment Intravenous fluids, pain medication, antibiotics [1]
Frequency8.9 million (2015) [6]
Deaths132,700 (2015) [7]

Pancreatitis is a condition characterized by inflammation of the pancreas. [1] The pancreas is a large organ behind the stomach that produces digestive enzymes and a number of hormones. [1] There are two main types: acute pancreatitis, and chronic pancreatitis. [1]

Contents

Signs and symptoms of pancreatitis include pain in the upper abdomen, nausea and vomiting. [1] The pain often goes into the back and is usually severe. [1] In acute pancreatitis, a fever may occur; symptoms typically resolve in a few days. [1] In chronic pancreatitis weight loss, fatty stool, and diarrhea may occur. [1] [5] Complications may include infection, bleeding, diabetes mellitus, or problems with other organs. [1]

The two most common causes of acute pancreatitis are a gallstone blocking the common bile duct after the pancreatic duct has joined; and heavy alcohol use. [1] Other causes include direct trauma, certain medications, infections such as mumps, and tumors. [1] Chronic pancreatitis may develop as a result of acute pancreatitis. [1] It is most commonly due to many years of heavy alcohol use. [1]

Other causes include high levels of blood fats, high blood calcium, some medications, and certain genetic disorders, such as cystic fibrosis, among others. [1] Smoking increases the risk of both acute and chronic pancreatitis. [3] [4] Diagnosis of acute pancreatitis is based on a threefold increase in the blood of either amylase or lipase. [1] In chronic pancreatitis, these tests may be normal. [1] Medical imaging such as ultrasound and CT scan may also be useful. [1]

Acute pancreatitis is usually treated with intravenous fluids, pain medication, and sometimes antibiotics. [1] Typically eating and drinking are disallowed, and a nasogastric tube is placed in the stomach. [1] A procedure known as an endoscopic retrograde cholangiopancreatography (ERCP) may be done to examine the distal common bile duct and remove a gallstone if present. [1] In those with gallstones the gallbladder is often also removed. [1] In chronic pancreatitis, in addition to the above, temporary feeding through a nasogastric tube may be used to provide adequate nutrition. [1] Long-term dietary changes and pancreatic enzyme replacement may be required. [1] Occasionally, surgery is done to remove parts of the pancreas. [1]

Globally, in 2015 about 8.9 million cases of pancreatitis occurred. [6] This resulted in 132,700 deaths, up from 83,000 deaths in 1990. [7] [8] Acute pancreatitis occurs in about 30 per 100,000 people a year. [3] New cases of chronic pancreatitis develop in about 8 per 100,000 people a year and currently affect about 50 per 100,000 people in the United States. [9] It is more common in men than women. [1] Often chronic pancreatitis starts between the ages of 30 and 40 and is rare in children. [1] Acute pancreatitis was first described on autopsy in 1882 while chronic pancreatitis was first described in 1946. [9]

Signs and symptoms

The most common symptoms of pancreatitis are severe upper abdominal or left upper quadrant burning pain radiating to the back, nausea, and vomiting that is worse with eating. The physical examination will vary depending on severity and presence of internal bleeding. Blood pressure may be elevated by pain or decreased by dehydration or bleeding. Heart and respiratory rates are often elevated. The abdomen is usually tender but to a lesser degree than the pain itself. As is common in abdominal disease, bowel sounds may be reduced from reflex bowel paralysis. Fever or jaundice may be present. Chronic pancreatitis can lead to diabetes or pancreatic cancer. Unexplained weight loss may occur from a lack of pancreatic enzymes hindering digestion.[ citation needed ]

Complications

Early complications include shock, infection, systemic inflammatory response syndrome, low blood calcium, high blood glucose, and dehydration. Blood loss, dehydration, and fluid leaking into the abdominal cavity (ascites) can lead to kidney failure. Respiratory complications are often severe. Pleural effusion is usually present. Shallow breathing from pain can lead to lung collapse. Pancreatic enzymes may attack the lungs, causing inflammation. Severe inflammation can lead to intra-abdominal hypertension and abdominal compartment syndrome, further impairing renal and respiratory function and potentially requiring management with an open abdomen to relieve the pressure. [10]

Late complications include recurrent pancreatitis and the development of pancreatic pseudocysts—collections of pancreatic secretions that have been walled off by scar tissue. These may cause pain, become infected, rupture and bleed, block the bile duct and cause jaundice, or migrate around the abdomen. Acute necrotizing pancreatitis can lead to a pancreatic abscess, a collection of pus caused by necrosis, liquefaction, and infection. This happens in approximately 3% of cases or almost 60% of cases involving more than two pseudocysts and gas in the pancreas. [11]

Causes

Eighty percent of cases of pancreatitis are caused by alcohol or gallstones. Gallstones are the single most common cause of acute pancreatitis. [12] Alcohol is the single most common cause of chronic pancreatitis. [13] [14] [15] [16] [17] Triglyceride levels greater than 1000 mg/dL (11.29 mmol/L) is another cause. [18]

Medications

There are seven classes of medications associated with acute pancreatitis: statins, ACE inhibitors, oral contraceptives/hormone replacement therapy (HRT), diuretics, antiretroviral therapy, valproic acid, and oral hypoglycemic agents. Mechanisms of these drugs causing pancreatitis are not known exactly, but it is possible that statins have direct toxic effect on the pancreas or through the long-term accumulation of toxic metabolites. Meanwhile, ACE inhibitors cause angioedema of the pancreas through the accumulation of bradykinin. Birth control pills and HRT cause arterial thrombosis of the pancreas through the accumulation of fat (hypertriglyceridemia). Diuretics such as furosemide have a direct toxic effect on the pancreas. Meanwhile, thiazide diuretics cause hypertriglyceridemia and hypercalcemia, where the latter is the risk factor for pancreatic stones.[ citation needed ]

HIV infection itself can cause a person to be more likely to get pancreatitis. Meanwhile, antiretroviral drugs may cause metabolic disturbances such as hyperglycemia and hypercholesterolemia, which predisposes to pancreatitis. Valproic acid may have direct toxic effect on the pancreas. [19] There are various oral hypoglycemic agents that contributes to pancreatitis including metformin. But, glucagon-like peptide-1 (GLP-1) is more strongly associated with pancreatitis by promoting inflammation. [20]

Atypical antipsychotics such as clozapine, risperidone, and olanzapine can also cause pancreatitis. [21]

Infection

A number of infectious agents have been recognized as causes of pancreatitis including: [22] [23] [24]

Other

Other common causes include trauma, autoimmune disease, high blood calcium, hypothermia, and endoscopic retrograde cholangiopancreatography (ERCP). Pancreas divisum is a common congenital malformation of the pancreas that may underlie some recurrent cases. Diabetes mellitus type 2 is associated with a 2.8-fold higher risk. [25]

Less common causes include pancreatic cancer, pancreatic duct stones, [26] vasculitis (inflammation of the small blood vessels in the pancreas), and porphyria—particularly acute intermittent porphyria and erythropoietic protoporphyria.[ citation needed ]

There is an inherited form that results in the activation of trypsinogen within the pancreas, leading to autodigestion. Involved genes may include trypsin 1, which codes for trypsinogen, SPINK1, which codes for a trypsin inhibitor, or cystic fibrosis transmembrane conductance regulator. [27]

The mnemonic GETSMASHED is often used to remember the common causes of pancreatitis: G—gallstones, E—ethanol, T—trauma, S—steroids, M—mumps, A—autoimmune pancreatitis, S—scorpion sting, H—hyperlipidemia, hypothermia, hyperparathyroidism, E—endoscopic retrograde cholangiopancreatography, D—drugs (commonly azathioprine, valproic acid, liraglutide). [28]

Diagnosis

Acute exudative pancreatitis on CT scan Pankreatitis exsudativ CT axial.jpg
Acute exudative pancreatitis on CT scan
Calcified pancreatic duct stones with some free intra-abdominal fluid CalcifiedPanDucStoneandSomefluid.png
Calcified pancreatic duct stones with some free intra-abdominal fluid

The differential diagnosis for pancreatitis includes but is not limited to cholecystitis, choledocholithiasis, perforated peptic ulcer, bowel infarction, small bowel obstruction, hepatitis, and mesenteric ischemia. [29]

Diagnosis requires 2 of the 3 following criteria:

Amylase and lipase are 2 enzymes produced by the pancreas. Elevations in lipase are generally considered a better indicator for pancreatitis as it has greater specificity and has a longer half life. [30] However, both enzymes can be elevated in other disease states. In chronic pancreatitis, the fecal pancreatic elastase-1 (FPE-1) test is a marker of exocrine pancreatic function. Additional tests that may be useful in evaluating chronic pancreatitis include hemoglobin A1C, immunoglobulin G4, rheumatoid factor, and anti-nuclear antibody. [31]

For imaging, abdominal ultrasound is convenient, simple, non-invasive, and inexpensive. [32] It is more sensitive and specific for pancreatitis from gallstones than other imaging modalities. [30] However, in 25–35% of patients the view of the pancreas can be obstructed by bowel gas making it difficult to evaluate. [29]

A contrast-enhanced CT scan is usually performed more than 48 hours after the onset of pain to evaluate for pancreatic necrosis and extrapancreatic fluid as well as predict the severity of the disease. CT scanning earlier can be falsely reassuring. [33]

ERCP or an endoscopic ultrasound can also be used if a biliary cause for pancreatitis is suspected.[ citation needed ]

Treatment

The treatment of pancreatitis is supportive and depends on severity. Morphine generally is suitable for pain control. There are no clinical studies to suggest that morphine can aggravate or cause pancreatitis or cholecystitis. [34]

The treatment for acute pancreatitis will depend on whether the diagnosis is for the mild form of the condition, which causes no complications, or the severe form, which can cause serious complications.[ citation needed ]

Mild acute pancreatitis

The treatment of mild acute pancreatitis is successfully carried out by admission to a general hospital ward. Traditionally, people were not allowed to eat until the inflammation resolved but more recent evidence suggests early feeding is safe and improves outcomes, and may result in an ability to leave the hospital sooner. [35]

Due to inflammation occurring in pancreatitis, proinflammatory cytokines secreted into the bloodstream can cause inflammation throughout the body, including the lungs and can manifest as ARDS. Because pancreatitis can cause lung injury and affect normal lung function, supplemental oxygen is occasionally delivered through breathing tubes that are connected via the nose (e.g., nasal cannulae) or via a mask. The tubes can then be removed after a few days once it is clear that the condition is improving.

Dehydration may result during an episode of acute pancreatitis, so fluids will be provided intravenously.

Opioids may be used for the pain. When the pancreatitis is due to gallstones, early gallbladder removal also appears to improve outcomes. [36]

Severe acute pancreatitis

Severe pancreatitis can cause organ failure, necrosis, infected necrosis, pseudocyst, and abscess. If diagnosed with severe acute pancreatitis, people will need to be admitted to a high-dependency unit or intensive care unit. It is likely that the levels of fluids inside the body will have dropped significantly as it diverts bodily fluids and nutrients in an attempt to repair the pancreas. The drop in fluid levels can lead to a reduction in the volume of blood within the body, which is known as hypovolemic shock. Hypovolemic shock can be life-threatening as it can very quickly starve the body of the oxygen-rich blood that it needs to survive. To avoid going into hypovolemic shock, fluids will be administered intravenously. Oxygen will be supplied through tubes attached to the nose and ventilation equipment may be used to assist with breathing. Feeding tubes may be used to provide nutrients, combined with appropriate analgesia.

As with mild acute pancreatitis, it will be necessary to treat the underlying cause—gallstones, discontinuing medications, cessation of alcohol, etc. If the cause is gallstones, it is likely that an ERCP procedure or removal of the gallbladder will be recommended. The gallbladder should be removed during the same hospital admission or within two weeks of pancreatitis onset so as to limit the risk of recurrent pancreatitis.

If the cause of pancreatitis is alcohol, cessation of alcohol consumption and treatment for alcohol dependency may improve pancreatitis. Even if the underlying cause is not related to alcohol consumption, doctors recommend avoiding it for at least six months as this can cause further damage to the pancreas during the recovery process. [37]

Oral intake, especially fats, is generally restricted initially but early enteral feeding within 48 hours has been shown to improve clinical outcomes. [38] Fluids and electrolytes are replaced intravenously. Nutritional support is initiated via tube feeding to surpass the portion of the digestive tract most affected by secreted pancreatic enzymes if there is no improvement in the first 72–96 hours of treatment. [39]

Prognosis

Severe acute pancreatitis has mortality rates around 2–9%, higher where necrosis of the pancreas has occurred. [40]

Several scoring systems are used to predict the severity of an attack of pancreatitis. They each combine demographic and laboratory data to estimate severity or probability of death. Examples include APACHE II, Ranson, BISAP, and Glasgow. The Modified Glasgow criteria suggests that a case be considered severe if at least three of the following are true: [41]

This can be remembered using the mnemonic PANCREAS:

The BISAP score (blood urea nitrogen level >25 mg/dl (8.9 mmol/L), impaired mental status, systemic inflammatory response syndrome, age over 60 years, pleural effusion) has been validated as similar to other prognostic scoring systems. [42]

Epidemiology

Globally the incidence of acute pancreatitis is 5 to 35 cases per 100,000 people. The incidence of chronic pancreatitis is 4–8 per 100,000 with a prevalence of 26–42 cases per 100,000. [43] In 2013 pancreatitis resulted in 123,000 deaths up from 83,000 deaths in 1990. [8]

Costs

In adults in the United Kingdom, the estimated average total direct and indirect costs of chronic pancreatitis is roughly £79,000 per person on an annual basis. [44] Acute recurrent pancreatitis and chronic pancreatitis occur infrequently in children, but are associated with high healthcare costs due to substantial disease burden. [45] Globally, the estimated average total cost of treatment for children with these conditions is approximately $40,500/person/year. [45]

Other animals

Fatty foods may cause canine pancreatitis in dogs. [46]

See also

Related Research Articles

<span class="mw-page-title-main">Gastroenterology</span> Branch of medicine focused on the digestive system and its disorders

Gastroenterology is the branch of medicine focused on the digestive system and its disorders. The digestive system consists of the gastrointestinal tract, sometimes referred to as the GI tract, which includes the esophagus, stomach, small intestine and large intestine as well as the accessory organs of digestion which include the pancreas, gallbladder, and liver. The digestive system functions to move material through the GI tract via peristalsis, break down that material via digestion, absorb nutrients for use throughout the body, and remove waste from the body via defecation. Physicians who specialize in the medical specialty of gastroenterology are called gastroenterologists or sometimes GI doctors. Some of the most common conditions managed by gastroenterologists include gastroesophageal reflux disease, gastrointestinal bleeding, irritable bowel syndrome, inflammatory bowel disease (IBD) which includes Crohn's disease and ulcerative colitis, peptic ulcer disease, gallbladder and biliary tract disease, hepatitis, pancreatitis, colitis, colon polyps and cancer, nutritional problems, and many more.

<span class="mw-page-title-main">Pancreas</span> Organ of the digestive system and endocrine system of vertebrates

The pancreas is an organ of the digestive system and endocrine system of vertebrates. In humans, it is located in the abdomen behind the stomach and functions as a gland. The pancreas is a mixed or heterocrine gland, i.e., it has both an endocrine and a digestive exocrine function. 99% of the pancreas is exocrine and 1% is endocrine. As an endocrine gland, it functions mostly to regulate blood sugar levels, secreting the hormones insulin, glucagon, somatostatin and pancreatic polypeptide. As a part of the digestive system, it functions as an exocrine gland secreting pancreatic juice into the duodenum through the pancreatic duct. This juice contains bicarbonate, which neutralizes acid entering the duodenum from the stomach; and digestive enzymes, which break down carbohydrates, proteins and fats in food entering the duodenum from the stomach.

<span class="mw-page-title-main">Gallstone</span> Disease where stones form in the gallbladder

A gallstone is a stone formed within the gallbladder from precipitated bile components. The term cholelithiasis may refer to the presence of gallstones or to any disease caused by gallstones, and choledocholithiasis refers to the presence of migrated gallstones within bile ducts.

<span class="mw-page-title-main">Cholecystitis</span> Inflammation of the gallbladder

Cholecystitis is inflammation of the gallbladder. Symptoms include right upper abdominal pain, pain in the right shoulder, nausea, vomiting, and occasionally fever. Often gallbladder attacks precede acute cholecystitis. The pain lasts longer in cholecystitis than in a typical gallbladder attack. Without appropriate treatment, recurrent episodes of cholecystitis are common. Complications of acute cholecystitis include gallstone pancreatitis, common bile duct stones, or inflammation of the common bile duct.

<span class="mw-page-title-main">Abdominal pain</span> Stomach aches

Abdominal pain, also known as a stomach ache, Is a symptom associated with both non-serious and serious medical issues. Since the abdomen contains most of the body's vital organs, it can be an indicator of a wide variety of diseases. Given that, approaching the examination of a person and planning of a differential diagnosis is extremely important.

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

Acute pancreatitis (AP) is a sudden inflammation of the pancreas. Causes, in order of frequency, include: a gallstone impacted in the common bile duct beyond the point where the pancreatic duct joins it; heavy alcohol use; systemic disease; trauma; and, in children, mumps. Acute pancreatitis may be a single event; it may be recurrent; or it may progress to chronic pancreatitis.

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

Chronic pancreatitis is a long-standing inflammation of the pancreas that alters the organ's normal structure and functions. It can present as episodes of acute inflammation in a previously injured pancreas, or as chronic damage with persistent pain or malabsorption. It is a disease process characterized by irreversible damage to the pancreas as distinct from reversible changes in acute pancreatitis. Tobacco smoke and alcohol misuse are two of the most frequently implicated causes, and the two risk factors are thought to have a synergistic effect with regards to the development of chronic pancreatitis. Chronic pancreatitis is a risk factor for the development of pancreatic cancer.

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

Gastrointestinal diseases refer to diseases involving the gastrointestinal tract, namely the esophagus, stomach, small intestine, large intestine and rectum, and the accessory organs of digestion, the liver, gallbladder, and pancreas.

<span class="mw-page-title-main">Common bile duct stone</span> Medical condition

Common bile duct stone, also known as choledocholithiasis, is the presence of gallstones in the common bile duct (CBD). This condition can cause jaundice and liver cell damage. Treatments include choledocholithotomy and endoscopic retrograde cholangiopancreatography (ERCP).

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

A pancreatic pseudocyst is a circumscribed collection of fluid rich in pancreatic enzymes, blood, and non-necrotic tissue, typically located in the lesser sac of the abdomen. Pancreatic pseudocysts are usually complications of pancreatitis, although in children they frequently occur following abdominal trauma. Pancreatic pseudocysts account for approximately 75% of all pancreatic masses.

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

Pseudocysts are like cysts, but lack epithelial or endothelial cells. Initial management consists of general supportive care. Symptoms and complications caused by pseudocysts require surgery. Computed tomography (CT) scans are used for initial imaging of cysts, and endoscopic ultrasounds are used in differentiating between cysts and pseudocysts. Endoscopic drainage is a popular and effective method of treating pseudocysts.

<span class="mw-page-title-main">Pancreas divisum</span> Congenital disorder of digestive system

Pancreatic divisum is a congenital anomaly in the anatomy of the ducts of the pancreas in which a single pancreatic duct is not formed, but rather remains as two distinct dorsal and ventral ducts. Most individuals with pancreas divisum remain without symptoms or complications. A minority of people with pancreatic divisum may develop episodes of abdominal pain, nausea or vomiting due to acute or chronic pancreatitis. The presence of pancreas divisum is usually identified with cross sectional diagnostic imaging, such as endoscopic retrograde cholangiopancreatography (ERCP) or magnetic resonance cholangiopancreatography (MRCP). In some cases, it may be detected intraoperatively. If no symptoms or complications are present, then treatment is not necessary. However, if there is recurrent pancreatitis, then a sphincterotomy of the minor papilla may be indicated.

Pancreatic diseases are diseases that affect the pancreas, an organ in most vertebrates and in humans and other mammals located in the abdomen. The pancreas plays a role in the digestive and endocrine system, producing enzymes which aid the digestion process and the hormone insulin, which regulates blood sugar levels. The most common pancreatic disease is pancreatitis, an inflammation of the pancreas which could come in acute or chronic form. Other pancreatic diseases include diabetes mellitus, exocrine pancreatic insufficiency, cystic fibrosis, pseudocysts, cysts, congenital malformations, tumors including pancreatic cancer, and hemosuccus pancreaticus.

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

Hereditary pancreatitis (HP) is an inflammation of the pancreas due to genetic causes. It was first described in 1952 by Comfort and Steinberg but it was not until 1996 that Whitcomb et al isolated the first responsible mutation in the trypsinogen gene (PRSS1) on the long arm of chromosome seven (7q35).

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

Hemosuccus pancreaticus is a rare cause of hemorrhage in the gastrointestinal tract. It is caused by a bleeding source in the pancreas, pancreatic duct, or structures adjacent to the pancreas, such as the splenic artery, that bleed into the pancreatic duct, which is connected with the bowel at the duodenum, the first part of the small intestine. Patients with hemosuccus may develop symptoms of gastrointestinal hemorrhage, such as blood in the stools, maroon stools, or melena, which is a dark, tarry stool caused by digestion of red blood cells. They may also develop abdominal pain. It is associated with pancreatitis, pancreatic cancer and aneurysms of the splenic artery. Hemosuccus may be identified with endoscopy (esophagogastroduodenoscopy), where fresh blood may be seen from the pancreatic duct. Alternatively, angiography may be used to inject the celiac axis to determine the blood vessel that is bleeding. This may also be used to treat hemosuccus, as embolization of the end vessel may terminate the hemorrhage. However, a distal pancreatectomy—surgery to remove of the tail of the pancreas—may be required to stop the hemorrhage.

<span class="mw-page-title-main">Biliary colic</span> Medical condition in which gallstones cause acute pain

Biliary colic, also known as symptomatic cholelithiasis, a gallbladder attack or gallstone attack, is when a colic occurs due to a gallstone temporarily blocking the cystic duct. Typically, the pain is in the right upper part of the abdomen, and can be severe. Pain usually lasts from 15 minutes to a few hours. Often, it occurs after eating a heavy meal, or during the night. Repeated attacks are common. Cholecystokinin - a gastrointestinal hormone - plays a role in the colic, as following the consumption of fatty meals, the hormone triggers the gallbladder to contract, which may expel stones into the duct and temporarily block it until being successfully passed.

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

Gallbladder diseases are diseases involving the gallbladder and is closely linked to biliary disease, with the most common cause being gallstones (cholelithiasis).

<span class="mw-page-title-main">Abdominopelvic cavity</span>

The abdominopelvic cavity is a body cavity that consists of the abdominal cavity and the pelvic cavity. The upper portion is the abdominal cavity, and it contains the stomach, liver, pancreas, spleen, gallbladder, kidneys, small intestine, and most of the large intestine. The lower portion is the pelvic cavity, and it contains the urinary bladder, the rest of the large intestine, and the internal reproductive organs.

<span class="mw-page-title-main">Canine pancreatitis</span>

Canine pancreatitis is inflammation of the pancreas that can occur in two very different forms. Acute pancreatitis is sudden, while chronic pancreatitis is characterized by recurring or persistent form of pancreatic inflammation. Cases of both can be considered mild or severe.

Type 3c diabetes is diabetes that comes secondary to pancreatic diseases, involving the exocrine and digestive functions of the pancreas. It also occurs following surgical removal of the pancreas.

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