Therapy with appropriate antimicrobial agents is an important component in the management of patients with acute cholangitis and/or acute cholecystitis. In the updated Tokyo Guidelines (TG13), we recommend antimicrobial agents that are suitable from a global perspective for management of these infections. These recommendations focus primarily on empirical therapy (presumptive therapy), provided before the infecting isolates are identified. Such therapy depends upon knowledge of both local microbial epidemiology and patient-specific factors that affect selection of appropriate agents. These patient-specific factors include prior contact with the health care system, and we separate community-acquired versus healthcare-associated infections because of the higher risk of resistance in the latter. Selection of agents for community-acquired infections is also recommended on the basis of severity (grades I–III).
Free full-text articles and a mobile application of TG13 are available via http://www.jshbps.jp/en/guideline/tg13.html.
Acute cholangitis and cholecystitis are common conditions that may result in progressively severe infection, particularly in debilitated hosts. Epidemiology and risk factors for acute cholangitis and cholecystitis are provided in a separated section of “TG13: Current terminology, etiology, and epidemiology of acute cholangitis and cholecystitis.” The primary goal of antimicrobial therapy in acute cholangitis and cholecystitis is to limit both the systemic septic response and local inflammation, to prevent surgical site infections in the superficial wound, fascia, or organ space, and to prevent intrahepatic abscess formation .
In acute cholangitis, drainage of the obstructed biliary tree (termed source control) was recognized as the mainstay of therapy long before the introduction of antimicrobial agents . An additional role of antimicrobial therapy, allowing delay in operation until patients are more physiologically stable, was initially defined by Boey and Way . They retrospectively reviewed 99 consecutive patients with acute cholangitis, and reported that 53 % of their patients who responded well to antimicrobial therapy were therefore given elective instead of emergency operation [1, 2].
The role of antimicrobial therapy in the broad range of diseases subsumed under the term “acute cholecystitis” also varies with severity and pathology. In early and non-severe cases, it is not obvious that bacteria play a significant role in the pathology encountered. In these patients, antimicrobial therapy is at best prophylactic, preventing progression to infection. In other cases, with clinical findings of a systemic inflammatory response, antimicrobial therapy is therapeutic, and treatment may be required until the gallbladder is removed.
Rationale for changes in these guidelines
Five years have passed since the Tokyo Guidelines were published in 2007, and it is now referred to as TG07 [3, 4]. During the last five years, there have been several developments in the management of biliary tract infections. For antimicrobial therapy, other guideline sources for biliary tract infections have been revised. These include the Surviving Sepsis Campaign 2008  and treatment guidelines for complicated intra-abdominal infections developed by the Surgical Infection Society of North America (SIS-NA) and the Infectious Diseases Society of America (IDSA) 2010 . Additionally, new agents and dosing regimens have been approved, including higher dose regimens for piperacillin/tazobactam, meropenem, levofloxacin and doripenem. The issues of pharmacokinetics and pharmacodynamics of antimicrobial agents have been clarified [3, 4]. Since the release of TG07 [3, 4], the emergence of antimicrobial resistance among clinical isolates of Enterobacteriaceae from patients with community-acquired intra-abdominal infections has been more widely reported [7–14]; in particular, antimicrobial resistance in Gram-negative bacilli driven by the appearance of extended-spectrum β-lactamases (ESBL) and carbapenemases (i.e., metallo-β-lactamase and non-metallo-β-lactamase) [15–19]. Finally, in the updated Tokyo Guidelines (TG13), both the diagnostic and severity criteria for acute cholangitis and cholecystitis have been revised and recommendations for antimicrobial therapy are reconsidered against this new structure.
There are new topics dealt with in these guidelines. We now make specific recommendations for antimicrobial therapy of healthcare-associated biliary infections. This was prompted by recognition of the increasing number of elderly patients with multiple medical problems exposed to the health care system and thereby being at risk of acquiring resistant organisms . In addition, there are several agents that are no longer recommended by the SIS-NA/IDSA 2010 guidelines . We also clarify concerns regarding the importance (or lack thereof) of biliary penetration. We also now address prophylaxis for elective endoscopic retrograde cholangiopancreatography (ERCP).
The bacteria commonly found in biliary tract infections are well known, and are presented in Tables 1 and 2 [3, 4, 20–31]. Antimicrobial therapy largely depends on local antimicrobial susceptibility data. In the international guidelines for acute cholangitis and cholecystitis (TG13), a framework for selecting antimicrobial agents will be provided, with class-based definitions of appropriate therapy. Listed agents in the guideline are appropriate for use, and recommendations for modification based upon the local microbiological findings, referred to as antibiogram, are made.
A systematic literature review was performed using PubMed from January 1, 2005 to May 15, 2012. All references were searched with the keywords “Acute cholangitis” AND “Antibiotics OR Antimicrobial therapy,” and “Acute cholecystitis” AND “Antibiotics OR Antimicrobial therapy” among human studies. Sixty-five and 122 articles were found, respectively. These references were further narrowed using keywords “Clinical trials” and “Randomized trials.” Literature cited in the TG07 was also reviewed and integrated for revision. If there were few data and few new developments on clinical questions addressed since 2005, a consensus process was used by the members of the Tokyo Guidelines Revision Committee after consultations with internationally recognized experts.
The structure of recommendations for selecting antimicrobial agents has been revised. Antimicrobial agents appropriate for initial therapy (empirical therapy or presumptive therapy) for various grades of severity of biliary tract infections have been developed. Table 3 lists antimicrobial agents appropriate for use for the treatment of patients with both community-acquired and healthcare-associated cholangitis and cholecystitis.
Clinically relevant questions are provided with brief answers and explanations below.
Q1. What specimen should be sent for culture to identify the causative organisms in acute cholangitis and cholecystitis?
Identifying the causative organism(s) is an essential step in the management of acute biliary infections. Positive rates of bile cultures range from 59 to 93 % for acute cholangitis [3, 4, 20–27], and positive rates of either bile or gallbladder cultures range from 29 to 54 % for acute cholecystitis [3, 4, 20–27]. In a recent study which utilized the TG07 diagnostic classification, positive rates of bile cultures among patients with cholangitis were 67 % (66 of 98 patients) and 33 % (32 of 98) without . Table 1 shows common microbial isolates from bile cultures among patients with acute biliary infections [3, 4, 20–27]. Common duct bile should be sent for culture in all cases of suspected cholangitis.
On the other hand, previous studies indicated that positive rates of blood cultures among patients with acute cholangitis ranged from 21 to 71 % . For acute cholecystitis, the prevalence of positive blood cultures is less than acute cholangitis, and in the last two decades it has been reported to range from 7.7 to 15.8 % [28, 31]. Table 2 shows the most recently reported microbial isolates from patients with bacteremic biliary tract infections [14, 28–30].
There is a lack of clinical trials examining the benefit of blood cultures in patients with acute biliary tract infections. Most of the bacteremic isolates reported (Table 2) are organisms that do not form vegetations on normal cardiac valves nor miliary abscesses. Their intravascular presence does not lead to an extension of therapy or selection of multidrug regimens. We therefore recommend such cultures be taken only in high-severity infections when such results might mandate changes in therapy . Blood cultures are not routinely recommended for grade I community-acquired acute cholecystitis (level D).
The SIS-NA/IDSA 2010 guidelines recommended against routine blood cultures for community-acquired intra-abdominal infections, since the results do not change the management and outcomes . This is in part driven by a study of the clinical impact of blood cultures taken in the emergency department . In this retrospective study, 1,062 blood cultures were obtained during the study period, of which 92 (9 %) were positive. Of the positive blood cultures, 52 (5 %) were true positive, and only 18 (1.6 %) resulted in altered management.
Q2. What considerations should be taken when selecting antimicrobial agents for the treatment of acute cholangitis and cholecystitis?
There are multiple factors to consider in selecting empiric antimicrobial agents. These include targeted organisms, local epidemiology and susceptibility data (antibiogram), alignment of in-vitro activity (or spectrum) of the agents with these local data, characteristics of the agents such as pharmacokinetics and pharmacodynamics, and toxicities, renal and hepatic function, and any history of allergies and other adverse events with antimicrobial agents [3, 4, 20–27]. A history of antimicrobial usage is important because recent (<6 months) antimicrobial therapy greatly increases the risk of resistance among isolated organisms.
Before dosing antimicrobial agents, renal function should be estimated with the commonly used equation: Serum creatinine = (140 – age) [optimum body weight (kg)]/72 × serum creatinine (mg/dl) [3, 4, 33]. Individual dosage adjustments for altered renal and hepatic function are available in several recent publications [34, 35]. Consultation with a clinical pharmacist is recommended if there are concerns.
Regarding the timing of therapy, it should be initiated as soon as the diagnosis of biliary infection is suspected. For patients in septic shock, antimicrobials should be administered within 1 h of recognition . For other patients, as long as 4 h may be spent obtaining definitive diagnostic studies prior to beginning antimicrobial therapy. Antimicrobial therapy should definitely be started before any procedure, either percutaneous, endoscopic, or operative, is performed. In addition, anaerobic therapy is appropriate if a biliary-enteric anastomosis is present (level C) .
Selected newer agents
Moxifloxacin has been investigated for intra-abdominal infections in several randomized studies [36–39]. It was demonstrated that moxifloxacin is safe, well-tolerated, and non-inferior to the comparators, such as ceftriaxone plus metronidazole , or piperacillin/tazobactam followed by amoxicillin/clavulanic acid . This study was conducted prior to the appearance of ESBL-mediated resistance . There are few data specifically regarding the treatment of acute cholangitis or cholecystitis, and resistance rates of E. coli and other common Enterobacteriacae to fluoroquinolones have risen [7–14].
Tigecycline was under clinical trials for approval during preparation of the manuscript, and is now approved for clinical use in Japan. Tigecycline has in-vitro activity against a wide range of clinically significant Gram-positive and Gram-negative bacteria . These include multidrug-resistant Gram-positive cocci such as methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus spp. For Gram-negative bacilli, ESBL-producing Enterobacteriaceae are susceptible, as are most anaerobes. Tigecycline has no activity against Pseudomonas aeruginosa. Tigecycline has been investigated for skin and soft tissue infections and complicated intra-abdominal infections . Tigecycline causes nausea and vomiting in approximately 10–20 % of patients, and is dose-related. This limits the dose that can be routinely administered and suggests only a secondary role for this agent, in the event of unusual pathogens or allergy to other classes of antimicrobial agents. Recent meta-analyses have demonstrated an increased mortality rate and treatment failure rate in randomized trials with this agent .
Antimicrobial agents appropriate for use in the management of community-acquired acute cholangitis and cholecystitis
Table 3 summarizes antimicrobial recommendations. It should be kept in mind that in the treatment of cholangitis, source control (i.e., drainage) is an essential part of management. The indications and timing for drainage are provided in the severity and flowchart of the management sections regarding acute cholangitis. Since 2005, there have been no randomized clinical trials of antimicrobial therapy for community-acquired acute cholangitis and/or acute cholecystitis. There have been multiple reports on clinical isolates with multiple drug resistance from intra-abdominal infections worldwide, and biliary infections in particular [7–14, 40].
Recommendations for antimicrobial therapy are based primarily upon extrapolations of microbiological efficacy and behavior of these agents against the more susceptible isolates treated in the clinical trials cited [36–39, 43–49]. Some concerns about this approach to defining efficacy against resistant isolates has been raised .
The use of severity of illness as a guide to antimicrobial agent selection has been questioned in the face of the increasing numbers of ESBL-producing E. coli and Klebsiella in the community. These organisms are not reliably susceptible to cephalosporins, penicillin derivatives, or fluoroquinolones. Previous guidelines have recommended that if more than 10–20 % of community isolates of E. coli are so resistant, then empiric coverage should be provided for these organisms until susceptibility data demonstrates sensitivity to narrower spectrum agents. Carbapenems, piperacillin/tazobactam, tigecycline, or amikacin may also be used to treat these isolates .
For grade III community-acquired acute cholangitis and cholecystitis, agents with anti-pseudomonal activities are recommended as initial therapy (empirical therapy) until causative organisms are identified. Pseudomonas aeruginosa is present in approximately 20 % of recent series [14, 27], and is a known virulent pathogen. Failure to empirically cover this organism in critically ill patients may result in excess mortality.
Enterococcus spp. is another important pathogen for consideration in patients with grade III community-acquired acute cholangitis and cholecystitis. Vancomycin is recommended to cover Enterococcus spp. for patients with grade III community-acquired acute cholangitis and/or cholecystitis, until the results of cultures are available. Ampicillin can be used if isolated strains of Enterococcus spp. are susceptible to ampicillin. Ampicillin covers most of the strains of Enterococcus faecalis from community-acquired infections in general. For Enterococcus faecium, vancomycin is the drug of choice for empirical therapy. However, in many hospitals, vancomycin-resistant Enterococcus spp., both E. faecium and E. faecalis, have emerged as important causes of infection. Treatment for these organisms requires either linezolid or daptomycin. Surgeons and other physicians making treatment decisions for patients with healthcare-associated infections should be aware of the frequency of these isolates in their hospital and unit. Then, regarding infrequently isolated anaerobes such as the Bacteroides fragilis group, we suggest to cover these organisms empirically when a biliary-enteric anastomosis is present (level C) .
For grade I and II community-acquired cholangitis and cholecystitis, Table 3 shows the agents appropriate for use. Of note, the intravenous formulation of metronidazole has not been approved in Japan. As a result, clindamycin is one of the alternatives where intravenous metronidazole is not available. Clindamycin resistance among Bacteroides spp. is significant and the use of clindamycin is no longer recommended in other intra-abdominal infections . Cefoxitin, cefmetazole, flomoxef, and cefoperazone/sulbactam are the agents in cephalosporins that have activities against Bacteroides spp. Cefoxitin is no longer recommended by the SIS-NA/IDSA 2010 guidelines due to the high prevalence of resistance among Bacteroides spp. . Local availability of agents as well as local susceptibility results are emphasized when choosing empirical therapy.
Table 4 summarizes antimicrobial agents with high prevalence of resistance among Enterobacteriaceae [7–14]. Ampicillin/sulbactam is one of the most frequently used agents for intra-abdominal infections. Nonetheless, the activity of ampicillin/sulbactam against E. coli, with or without ESBLs, has fallen to levels that prevent a recommendation for its use.
In the TG13, ampicillin/sulbactam alone is not recommended as empirical therapy if the local susceptibility is <80 %. It is reasonable to use ampicillin/sulbactam as definitive therapy when the susceptibility of this agent is proven. Ampicillin/sulbactam may be used if an aminoglycoside is combined until susceptibility testing results are available.
Fluoroquinolone use is only recommended if the susceptibility of cultured isolates is known since antimicrobial resistance has been increasing significantly [7–14]. This agent can also be used as an alternative agent for patients with β-lactam allergies.
Antimicrobial agents appropriate for use in the management of healthcare-associated acute cholangitis and cholecystitis
There is no evidence to support any agent as optimal treatment of healthcare-associated acute cholangitis and cholecystitis. The principles of empirical therapy of healthcare-associated infections include using agents with anti-pseudomonal activity until definitive causative organisms are found. This paradigm is now expanded to include empirical coverage for ESBL-producing Gram-negative organisms based on local microbiological findings (local antibiogram). Table 3 shows empirical agents (presumptive therapy) for healthcare-associated acute cholangitis and cholecystitis. Vancomycin is recommended when patients are colonized with resistant Gram-positive bacteria such as methicillin-resistant Staphylococcus aureus and/or Enterococcus spp. or when these multidrug-resistant Gram-positives are of concern. Staphylococcus aureus is not as common an isolate for acute biliary infections as Enterococcus spp. Vancomycin-resistant Enterococcus (VRE) should be covered empirically with linezolid or daptomycin if this organism is known to be colonizing the patient, if previous treatment included vancomycin, and/or if the organism is common in the community.
Regarding anaerobes such as the Bacteroides fragilis group, we suggest to cover these organisms empirically in the presence of a biliary-enteric anastomosis (level C) .
Is it necessary for agents used in acute biliary infections to be concentrated in bile?
Historically, biliary penetration of agents has been considered in the selection of antimicrobial agents. However, there is considerable laboratory and clinical evidence that as obstruction occurs, secretion of antimicrobial agents into bile stops . Well-designed randomized clinical trials comparing agents with or without good biliary penetration are needed to determine the clinical relevance and significance of biliary penetration in treating acute biliary infections.
How should highly resistant causative organisms be managed in treating acute cholangitis and cholecystitis?
The major microbiological phenomenon of the last decade has been the emergence of novel β-lactamase-mediated resistance mechanisms in Enterobacteriaceae. These have been seen in intra-abdominal infections worldwide [7–19, 27]. These organisms have moved into many communities, and are now seen increasingly in community-acquired infections such as cholangitis and cholecystitis. The frequency of ESBL-producing E. coli and Klebsiella spp. has reached the point in some countries where decisions regarding empirical therapy must be guided by their prevalence. ESBL-producing E. coli is highly susceptible to carbapenems and to tigecycline. In some communities, highly resistant Klebsiella spp. and E. coli with carbapenemases are now seen [51–54]. The widely accepted rule for empirical therapy is that resistant organisms occurring in more than 10–20 % of patients should be treated. Colistin is the salvage agent for the above multidrug-resistant Gram-negative bacilli epidemic strains [40, 54]. This agent is toxic, dosing is uncertain, and its use should involve consultation with infectious disease specialists .
In the SIS-NA/IDSA 2010 guidelines , antimicrobial agents as empirical therapy for healthcare-associated intra-abdominal infections were given. In the guidelines, carbapenems, piperacillin/tazobactam, and ceftazidime or cefepime, each combined with metronidazole, have been recommended when the prevalence of resistant Pseudomonas aeruginosa, ESBL-producing Enterobacteriaceae, Acinetobacter or other multidrug-resistant Gram-negative bacilli is less than 20 %. For ESBL-producing Enterobacteriaceae, carbapenems, piperacillin/tazobactam, and aminoglycosides are recommended. For Pseudomonas aeruginosa, if the prevalence of resistance to ceftazidime is more than 20 %, carbapenems, piperacillin/tazobactam, and aminoglycosides are recommended. Even with this guide, selecting appropriate agents for antimicrobial stewardship is often difficult.
Q3. What are the special concerns for community-acquired acute cholecystitis in management with antimicrobial agents?
In most cases, cholecystectomy removes the infection, and little if any infected tissue remains. Under these circumstances, there is no benefit to extending antimicrobial therapy beyond 24 h.
Recent randomized clinical trials for antimicrobial therapy of acute cholecystitis are limited [43, 46–48]. In these randomized studies, comparisons were made such as ampicillin plus tobramycin versus piperacillin or cefoperazone, pefloxacin versus ampicillin and gentamicin, and cefepime versus mezlocillin plus gentamicin [4, 43, 46, 48]. There were no significant differences between the agents compared. In the TG13, the agents considered as appropriate therapy, and detailed in Table 3, have all been utilized in randomized controlled trials of intra-abdominal infections. These studies included patients with pathologically advanced cholecystitis (abscess or perforation). Table 3 is provided for both community-acquired and healthcare-associated acute cholecystitis.
Antimicrobial therapy after susceptibility testing results are available
Once susceptibility testing results of causative microorganisms are available, specific therapy (or definitive therapy) should be offered. This process is called de-escalation . Agents in Table 4 can be used safely once the susceptibility is proven.
Duration of treatment of patients with clinical and laboratory success
The optimal duration of antimicrobial therapy for community-acquired and healthcare-associated acute cholangitis and cholecystitis has not been determined in well-designed randomized controlled studies. Whether the source of infection (i.e., biliary obstruction) is well controlled or not is critical in determining the duration of therapy. In addition, recent technological advances for biliary drainage have significantly affected the overall management strategies for at least the last two decades.
In the SIS-NA/IDSA 2010 guidelines, the recommended duration of antimicrobial therapy for complicated intra-abdominal infections is 4–7 days once the source of infection is controlled . Since there are very few data available for the duration of either community-acquired or healthcare-associated acute cholangitis and cholecystitis, Table 5 was developed to guide the duration of antimicrobial therapy as expert opinion. When bacteremia with Gram-positive bacteria such as Enterococcus spp. and Streptococcus spp. is present, it is prudent to offer antimicrobial therapy for two weeks since these organisms are well known to cause infective endocarditis.
Conversion to oral antimicrobial agents
Patients with acute cholangitis and cholecystitis who can tolerate oral feeding may be treated with oral therapy . Depending on the susceptibility patterns of the organisms identified, oral antimicrobial agents such as fluoroquinolones (ciprofloxacin, levofloxacin, or moxifloxacin), amoxicillin/clavulanic acid, or cephalosporins may also be used. Table 6 lists commonly used oral antimicrobial agents with good bioavailabilities.
What is the optimal prophylaxic agent before elective endoscopic retrograde cholangiopancreatography (ERCP)?
A Cochrane meta-analysis examining the benefits of antibiotic prophylaxis for elective ERCP has been performed, and found benefit to the practice . The international guidelines on prophylaxis with endoscopy indicated that prophylaxis with ERCP is recommended . As consensus statements, the guidelines  recommended the standard prophylaxis regimen to prevent infective endocarditis. The regimen includes amoxicillin or clindamycin orally, or ampicillin or cefazolin as intravenous agents, and vancomycin for patients with β-lactam allergies to prevent infective endocarditis. However, the regimens for preventing cholangitis and bacteremia due to obstructive biliary tract were not included.
Recent meta-analyses [56, 58] had conflicting conclusions regarding the effectiveness of prophylactic therapy before elective ERCP. Bai et al. concluded that prophylaxic agents cannot prevent cholangitis , while a Cochrane review indicated that prophylaxic antimicrobial therapy before elective ERCP reduces the incidence of bacteremia [relative risk (RR) 0.50], cholangitis (RR 0.54), and pancreatitis (RR 0.54) . However, overall mortality was not reduced with prophylaxis before elective ERCP [RR 1.33, confidence interval (CI) 0.32–5.44]. In this review, the numbers needed to treat (NNT) to prevent bacteremia (NNT = 11) and cholangitis (NNT = 38) were also demonstrated. The Cochrane review concluded that further studies are needed, including randomized placebo-controlled studies, to investigate the effectiveness of prophylaxis for elective ERCP with low risk of bias, randomized comparison of the timing of administration of prophylaxis (before vs. during or after ERCP), and randomized head-to-head comparison of antimicrobial agents as prophylactic therapy with elective ERCP .
Antimicrobial agents investigated with elective ERCP include minocycline orally , piperacillin [60, 61], clindamycin plus gentamicin , cefuroxime , cefotaxime [64, 65], and ceftazidime .
In the TG13, antimicrobial prophylactic agents appropriate for use in preventing cholangitis or bacteremia due to biliary tract obstruction are provided on a consensus basis. Table 7 lists those agents. Cefazolin or other narrower-spectrum cephalosporins can be used as prophylactic agents. Cefazolin is one of the agents for preventing infective endocarditis with endoscopy and a convenient agent to be used to prevent both endocarditis and cholangitis. Piperacillin is one of the anti-pseudomonal agents that have been studied as a prophylactic agent for elective ERCP [60, 61]. Given the emergence of resistance among Gram-negative organisms worldwide, including ESBL-producing strains [7–14, 27], we recommend anti-pseudomonal agents such as piperacillin or piperacillin/sulbactam listed in Table 7.
Use of antibiotic irrigation
There has been continuing interest in irrigation of surgical fields with antimicrobial agents, and the subject has recently been reviewed . The authors concluded that topical antimicrobial agents are clearly effective in reducing wound infections and may be as effective as the use of systemic antimicrobial agents. The combined use of systemic and topical antimicrobial agents may have additive effects, but this is lessened if the same agent is used for both topical and systemic administration.
Antimicrobial agents should be used prudently while promoting antimicrobial stewardship in each institution, local area, and country. The recent global spread of antimicrobial resistance gives us warning in current practice. TG13 provides a practical guide for physicians and surgeons who are involved in the management of community-acquired and healthcare-associated acute biliary infections. There are still many areas of uncertainty in this subject. Continuous monitoring of local antimicrobial resistance and further studies on acute cholangitis and cholecystitis should be warranted.
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Gomi, H., Solomkin, J.S., Takada, T. et al. TG13 antimicrobial therapy for acute cholangitis and cholecystitis. J Hepatobiliary Pancreat Sci 20, 60–70 (2013). https://doi.org/10.1007/s00534-012-0572-0
- Acute cholangitis
- Acute cholecystitis
- Antimicrobial therapy
- Treatment guidelines
- Biliary tract infection