Introduction
Background
Acute cholecystitis in the presence of bacteria-containing bile may progress to suppurative infection in which the gallbladder fills with purulent material, a condition referred to as empyema of the gallbladder. (The underlying cause of cholecystitis involves obstruction of the cystic duct, which causes the buildup of infected fluid.) Systemic antibiotics and urgent drainage or resection are required to reduce the incidence of complications and to avoid or treat associated sepsis.
Pathophysiology
In the bacterially contaminated gallbladder, the stagnation and marked inflammation associated with acute cholecystitis fills the gallbladder lumen with exudative material principally comprised of frank pus. This process may be associated with calculous cholecystitis, acalculous cholecystitis, or carcinoma of the gallbladder. Left untreated, generalized sepsis ensues, with progression in the gallbladder to patchy gangrene, microperforation, macroperforation, or, rarely, cholecystoduodenal fistula. Patients at increased risk for cholecystitis include those with diabetes, immunosuppression, obesity, or hemoglobinopathies.
Frequency
International
True incidence of empyema of the gallbladder associated with acute cholecystitis is difficult to assess, although findings from limited series indicate a range of 5-15%.
Mortality/Morbidity
The rate of laparoscopic cholecystectomy procedures converted to an open procedure is significantly higher in patients with empyema of the gallbladder. The postoperative complication rate (regardless of approach) for empyema of the gallbladder is 10-20% and includes wound infection, bleeding, subhepatic abscess, cystic stump leak, common bile duct injury, and systemic complications, including acute renal failure and/or respiratory insufficiency associated with sepsis.
Progression to death is unusual in otherwise healthy individuals but may occur in patients of advanced age, in patients with compromised immunity, or in individuals with significant comorbid conditions.
Race
American Indians and Central American Indians have an increased risk of cholelithiasis/cholecystitis, as do patients with hemoglobinopathies, such as sickle cell anemia (more likely in blacks).
Clinical
History
The clinical history of a patient with empyema of the gallbladder is similar to that of a patient with acute cholecystitis (from which the empyema derives). As the disease progresses, severe pain and associated high fever, chills, and even rigors may be reported. Patients with diabetes or immunosuppression may exhibit few signs and symptoms.
Physical
- Patients with an early empyema of the gallbladder often present no differently than any patient with acute cholecystitis, with symptoms that include fever (temperature, >101°F), stable blood pressure, and mild tachycardia.
- However, if localized or free perforation has occurred and/or the patient has generalized sepsis, fevers (temperature, 103°F), chills and/or rigors, and confusion may be observed in association with hypotension and severe tachycardia.
- Early on, abdominal examination findings are similar to those of patients with acute cholecystitis, with mild-to-moderate tenderness in the right upper abdomen and a positive Murphy sign (ie, arrest of inspiration as the gallbladder descends to touch a hand previously placed deep in the mid right abdomen).
- As the disease progresses, empyema of the gallbladder may be associated with a palpable distended gallbladder that is markedly tender on even superficial palpation.
Causes
The most frequent etiology of empyema of the gallbladder is unresolved acute calculous cholecystitis in the face of contaminated bile. The most frequently isolated organisms include Escherichia coli, Klebsiella pneumoniae, Streptococcus faecalis, and anaerobes, including Bacteroides and Clostridia species. Suppurative inflammation ensues, tightly filling the gallbladder with purulent debris. Localized or free perforation occurs if drainage or resection is not performed at this juncture. Generalized sepsis frequently accompanies this progression.A similar pattern is infrequently observed in association with acute acalculous cholecystitis. Rarely, obstruction of the distal common bile duct may result in pus formation within the extrahepatic biliary tree, which can then decompress into the gallbladder. This distends and infects that organ, with ensuing empyema.
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References
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Further Reading
Keywords
empyema of the gallbladder, acute cholecystitis, calculous cholecystitis, acalculous cholecystitis, gangrenous cholecystitis, cholelithiasis, chololithiasis, sepsis, Escherichia coli, E coli, Klebsiella pneumoniae, K pneumoniae, Streptococcus faecalis, S faecalis, Bacteroides, Clostridia
Overview: Empyema, Gallbladder