Gallstone disease overview
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Hadeel Maksoud M.D.[2]
Overview
Gallstone disease is the presence of gallstones (cholelithiasis) within the gallbladder —chole- means "bile", lithia means "stone", and -sis means "process". Gallstones are crystalline bodies formed within the body by concretion of normal or abnormal bile components. Gallstones can occur anywhere within the biliary tree, including the gallbladder and the common bile duct. Obstruction of the common bile duct is called choledocholithiasis, obstruction of the biliary tree can cause jaundice and obstruction of the outlet of the pancreatic exocrine system can cause pancreatitis.
Historical Perspective
Gallstone disease has been noted as far back as when Egyptian pharaohs ruled. Autopsies performed on mummies found gallstones present within the body cavities.
Classification
Gallstone disease may be classified according to the chemical analysis of the stone found into 3 subtypes/groups: pure cholesterol, pure bilirubin stones and mixed.
Pathophysiology
It has long been noted that gallbladder stone formation, and in particular cholesterol stones, are associated with bile supersaturation, and this still remains the most common cause for gallstone formation.
Causes
Common causes of gallstone disease include increasing age, pregnancy, oral contraceptive pills and obesity.
Differentiating Gallstone disease overview from Other Diseases
Gallstone disease must be differentiated from other diseases that cause right upper quadrant pain such as: gastroesophageal reflux disorder, peptic ulcer disease, hepatitis, sphincter of Oddi dysfunction, appendicitis, bile duct stricture, chronic pancreatitis, irritable bowel syndrome, ischemic heart disease, pyelonephritis, ureteral calculi and complications of gallstone disease include: acute cholecystitis, choledocholithiasis, acute pancreatitis, and acute cholangitis.
Epidemiology and Demographics
Gallstone disease has an overall higher incidence in females than males of the Caucasian, Hispanic and Native American nations. Whilst a lower incidence was found in Eastern European, African American, and Japanese populations. Approximately 6200 people will have gallstones per 100,000 worldwide.
Risk Factors
Common risk factors in the development of gallstone disease include age, sex, pregnancy, and oral contraceptives and estrogen replacement therapy. Less common risk factors include hepatic and biliary cirrhosis.
Screening
Periodic screening for gallstones is not currently indicated. However, it has been suggested that screening diabetic patients for gallstones and treating them earlier is good practice for avoiding a future cholecystectomy or possible complications.
Natural History, Complications, and Prognosis
Gallstone disease patients should not undergo an elective cholecystectomy until symptoms develop, since almost 55% of patients will remain asymptomatic. Also, the complications of asymptomatic gallstones are almost negligible unless symptoms develop. The complications of gallstone disease include acute cholecystitis, obstructive jaundice, acute cholangitis and acute pancreatitis. The prognosis after laparoscopic cholecystectomy is excellent with morbidity and mortality rates being as low as 0.5 and 10% respectively.
Diagnosis
History and Symptoms
The diagnosis of uncomplicated gallstone disease is made in a patient who may be asymptomatic or experiencing biliary colic with a normal physical examination and normal laboratory tests including complete blood count, aminotransferases, bilirubin, alkaline phosphatase, amylase, and lipase.Typically, the evaluation begins with a transabdominal ultrasound since it is the most sensitive modality for detecting gallbladder stones. Most patients are females over the age of 40 whom have had multiple children and tend to have a BMI over 25.
Physical Examination
Patients with gallstones are usually not ill-appearing and don't have fever or tachycardia. Physical examination of patients with gallstones is sometimes remarkable for right upper quadrant pain, epigastric tenderness, guarding and jaundice. This occurs when stone reach more than 8mm in size. Courvoisier's sign (a palpable gallbladder on physical examination) may be palpated when the common bile duct becomes obstructed and the gallbladder becomes dilated. This mostly occurs with malignant common bile duct obstruction, but has been reported with choledocholithiasis
Laboratory Findings
Laboratory findings are usually normal among patients with uncomplicated gallstone disease, both during asymptomatic periods and during attacks of pain. Abnormal blood tests (leukocytosis, elevated liver or pancreas tests) suggest the development of a complication of gallstone disease, such as cholecystitis, cholangitis, or pancreatitis
Imaging findings
Stones are mainly visualised using transabdominal ultrasonography.
Other diagnostic studies
There are other imaging modalities that can be useful in diagnosing gallstone disease, these include; endoscopic retrograde cholangiopancreatography (ERCP), bile microscopy and oral cholecystography. It should be noted however, that some of these have been replaced by non-invasive, more advanced and less expensive imaging technique
Treatment
Medical Therapy
Nonoperative management is suboptimal (ursodiol, lithotripsy). Cholecystectomy is the therapy of choice.
Surgery
Surgery is not the first-line treatment option for patients with asymptomatic gallstones. Surgery is usually reserved for patients with either symptomatic gallstones and willing to undergo surgery, had complications due to gall stones or are at risk of gallbladder cancer, and having symptomatic recurrent attacks.
Primary Prevention
Effective measures for the primary prevention of gallstone disease include diet with sufficient fat and protein, maintaining a low body weight, and avoiding prolonged fasting.
Secondary Prevention
Effective measures for the secondary prevention of gallstone disease include dietary measures and bile acid therapy. However, medical therapy of asymptomatic stones is not currently indicated.