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World Journal of Gastroenterology logoLink to World Journal of Gastroenterology
. 2017 Jul 7;23(25):4654–4660. doi: 10.3748/wjg.v23.i25.4654

Nosocomial spontaneous bacterial peritonitis antibiotic treatment in the era of multi-drug resistance pathogens: A systematic review

Marco Fiore 1,2,3, Alberto Enrico Maraolo 1,2,3, Ivan Gentile 1,2,3, Guglielmo Borgia 1,2,3, Sebastiano Leone 1,2,3, Pasquale Sansone 1,2,3, Maria Beatrice Passavanti 1,2,3, Caterina Aurilio 1,2,3, Maria Caterina Pace 1,2,3
PMCID: PMC5504381  PMID: 28740354

Abstract

AIM

To systematically review literature upon aetiology of nosocomial spontaneous bacterial peritonitis (N-SBP) given the rising importance of multidrug-resistant (MDR) bacteria.

METHODS

A literature search was performed on MEDLINE and Google Scholar databases from 2000 to 15th of November 2016, using the following search strategy: “spontaneous” AND “peritonitis”.

RESULTS

The initial search through electronic databases retrieved 2556 records. After removing duplicates, 1958 records remained. One thousand seven hundred and thirty-five of them were excluded on the basis of the screening of titles and abstract, and the ensuing number of remaining articles was 223. Of these records, after careful evaluation, only 9 were included in the qualitative analysis. The overall proportion of MDR bacteria turned out to be from 22% to 73% of cases across the studies.

CONCLUSION

N-SBP is caused, in a remarkable proportion, by MDR pathogens. This should prompt a careful re-assessment of guidelines addressing the treatment of this clinical entity.

Keywords: Hospital-acquired infections, Nosocomial spontaneous bacterial peritonitis, Multidrug resistant bacteria, Cirrhosis, Critically ill patient


Core tip: Nosocomial spontaneous bacterial peritonitis (N-SBP) develops in up to one-third of cirrhotic patients. The overall 30-d survival for N-SBP is only 20%, also due to an inadequate empirical antibiotic therapy (EAT). The aim of our Sistematic Review is to describe N-SBP bacterial aetiology and the prevalence of multiple drug resistance (MDR) pathogens to suggest which EAT may be adequate in these entities. After careful evaluation 9 studies were identified. The overall proportion of MDR bacteria was up to 22%-73% of cases. EAT with a carbapenem plus daptomycin and a Beta-lactam active against methicillin-resistant cocci should be considered in centers with a high prevalence of MDR bacteria.

INTRODUCTION

Bacterial infections are a well-known cause of morbidity and mortality in cirrhotic patients, being a leading aetiology of progression in liver failure[1]. Subjects suffering from liver cirrhosis can be considered as immunocompromised[2] and, as such, are more prone to infections, whose incidence and severity is greater than in non-cirrhotic individuals. Spontaneous bacterial peritonitis (SBP) and urinary tract infections are the most frequent infections in this setting[3].

SBP is defined as a bacterial infection, usually monomicrobial, of ascitic fluid, without an evident source of sepsis in the peritoneum or adjacent tissues, occurring in subjects with decompensated liver diseases[4]. Diagnosis relies on ascitic fluid cell analysis (polymorphonuclear cell count ≥ 250/mm3) and ascitic fluid culture, but positivity of microbiological findings is inconstant, generally lower than 50%; thereby, many cases are classified as culture-negative[5].

The fundamental pathogenic mechanism underlying SPB is the bacterial translocation from the gut. It is well-known how in cirrhotic patients the composition of gut microbiota is altered both from a quantitative and qualitative perspective[6] Moreover, in this context gut’s barrier function and immune response to translocating microbes are hindered[6]. In light of these considerations, it does not come as surprise the historical prevalence of Gram-negative enteric bacteria among the etiological agents of SBP, influencing the empirical therapeutic choice[7]. However, over the last years physicians have been facing an important change in the epidemiology features of SBP, in particular, and of bacterial infections, in broader sense in cirrhotic patients. Indeed, since early 2000s, factors such as the prophylactic oral antibiotic therapy with quinolones used to prevent SBP have led up to the remarkable increase of Gram-positive bacteria as causative agents, as well as the occurrence of infections by multi-drug resistant (MDR) organisms[8,9].

The most frequently isolated MDR bacteria are extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae, non-fermentable Gram-negative bacilli (such as Pseudomonas aeruginosa), methicillin-resistant Staphylococcus aureus (MRSA), and vancomycin-resistant enterococci (VRE)[10]. This trend has been applying to all the major types of bacterial infection in cirrhotic patients, including SBP[4].

Recently, SBP caused by MDR bacteria has been exclusively associated with nosocomial infections[11]. Resistant pathogens are one the main reason why SBP is still today a potentially life-threating infection in hospitalized patients, being the mortality rate up to 20%[12]. This rate is dramatic in view of the fact that more than a third of decompensated ESLD patients develop nosocomial SBP (N-SBP) during hospitalization[13]. Nosocomial SBP seems to have a higher risk to be provoked by MDR bacteria. The selection of the appropriate empiric regimen, pending the culture results, is a crucial decision because any delay implies an increase of the mortality rates[14].

The increasing failure of traditional treatment options for nosocomial SBP, namely third-generation cephalosporins as recommended by previous guidelines[5], has prompted a re-evaluation of suggested empirical therapeutic regimens, which should be based on broader-spectrum agents, such as piperacillin/tazobactam, meropenem ± glycopeptide[14] or meropenem plus daptomycin[12] . For instance, the latter proved to be more effective than ceftazidime alone in a recent randomized controlled trial involving patients with nosocomial SBP[12]. According to the most recent recommendations, third-generation cephalosporins should be restricted only to selected patients, particularly in case of community-acquired infections[3].

A “grey area” is represented by the so-called healthcare-associated infections, whose difference with nosocomial infections appears to be extremely tenuous in terms of epidemiology and outcome[15].

The aim of this systematic review is to provide a comprehensive overview of the microbiological features, both from an etiological and resistance standpoint, of N-SBP in order to have an insight into the MDR forms and inform physicians’ empirical choice depending on the context wherein infection occurs.

MATERIALS AND METHODS

This systematic review was carried out according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses[16].

Definition

Spontaneous peritonitis (SP) is an infection of ascitic fluid of cirrhotic patients without a definitive alternative intra-abdominal source of infection. If a microbiological culture is performed on ascitic fluid, the growth of bacteria makes diagnosis of SBP, instead the growth of fungi makes diagnosis of Spontaneous fungal peritonitis (SFP)[17]. Cases were defined nosocomial if the diagnosis was made after 48[11] or 72[12] h of hospitalization. Multidrug-resistance was defined as to at least one agent in three or more anti-infective agents categories[18].

Literature search strategy

The MEDLINE and Google Scholar databases[19] were screened from 2000 to 15th of November 2016, using the following search strategy “spontaneous” AND “peritonitis”. References were managed using both Endnote X5 and Zotero. Handsearching of additional records was performed screening the reference list of the retrieved full-text articles.

Study selection

Two independent reviewers (Fiore M and Maraolo AE) screened titles and abstracts to establish eligibility for full-text review. No geographical restriction was placed. Studies were included if (1) published in full and written in English; (2) published in peer-reviewed journal; (3) clearly defined the onset of SBP (nosocomial alone or as opposed to non-nosocomial setting) in cirrhotic patients; and (4) specified the aetiology and the resistance profile of SBP causative agents, among the culture-positive cases. Studies were excluded if (1) primitive polymicrobial infections were not taken into account; (2) aetiology and resistance profile of SBP causative agents could not be extricated from the presented data (e.g., aetiology and bacterial susceptibility referring to both SBP and bacterascites, or to both infections of ascitic fluid and bacterial infections other than SBP); (3) they were case series or case reports; (4) they were not empirical studies (e.g., reviews, editorials, commentaries, book chapters); and (5) they were only published as abstracts, congress posters, letters to the editors.

Data extraction

Full text articles resulting from the end of the data selection process were reviewed by Fiore M and Maraolo AE to identify (1) study characteristics as authors, journal, clinical setting and country, observation time span and design; (2) temporal definition of nosocomial cases; (3) ratio between nosocomial and non-nosocomial episodes; (4) number of culture-positive cases among the total episodes; (5) ratio between bacterial and fungal cases of spontaneous peritonitis; (6) ratio between cases due to Gram-positive bacteria and to Gram-negative bacteria; (7) proportion of MDR strains in the overall sample; (8) proportion of MDR strains among Gram-positive bacteria; and (9) proportion of MDR strains among Gram-negative bacteria. Results were crosschecked and any disagreement was resolved through a third reviewer’s opinion (Leone S).

RESULTS

Studies retrieved

Figure 1 depicts the whole selection process involving the studies selected for this systematic review. The initial search through electronic databases retrieved 2556 records. After removing duplicates, 1958 records remained. One thousand seven hundred and thirty-five of them were excluded on the basis of the screening of titles and abstract, and the ensuing number of remaining articles was 223. Of these records, after careful evaluation, only 9 were included in the qualitative analysis, meeting both the aforementioned inclusion and exclusion criteria.

Figure 1.

Figure 1

Flow chart of studies selection. SBP: Spontaneous bacterial peritonitis; CA: Community acquired; SFP: Spontaneous fungal peritonitis.

Study characteristics

Tables 1 and 2 describe the main features of included studies[12,20-27]. Eight of the 9 studies were conducted in University Hospitals. Eight observational studies (5 retrospective and 3 prospective) and one randomized controlled trial (RCT); the majority of the studies was conducted on a European population (2 Germany, 2 Italy, 1 Spain), followed by the Asia (2 South Korea, 1 China) and North America (1 Canada). A total of 1.201 positive culture of ascitic fluid of cirrhotic patients were included. Five hundred and twenty positive culture were nosocomial SP, of these 19 were fungal peritonitis and 501 were bacterial peritonitis, respectively. Identification of pathogens in ascitic fluids from patients with N-SBP is approximately 50%[12,27] as that reported historically in peritonitis not nosocomial[5]. The review shows that recently the bacterial spectrum seems to have changed with high prevalence of Gram-positive bacteria (29.3%-62.5%). The percentage of MDR varies from 36.8 to 50% for the Gram-positive and from 30% to 66.6% for the Gram-negative bacteria.

Table 1.

Study characteristics (part 1)

Ref. Country, clinical setting Study years Study design N-SP definition (hours after admission) N-SP/non N-SP
Song et al[20] South Korea, University Hospital 1998-2003 RC > 72 32/74
Cheong et al[21] South Korea, University Hospital 2000-2007 RC > 72 126/110
Fernández et al[22] (first cohort) Spain, University Hospital 2005-2007 PC > 48 32/94
Fernández et al[22] (second cohort) Spain, University Hospital 2010-2011 PC > 48 7/26
Chaulk et al[23] Canada, University Hospital 2003-2011 RC > 48 17/60
Li YT et al[24] China, University Hospital 2011-2013 RC > 48 99/207
Friedrich et al[25] Germany, University Hospital 2007-2013 RC > 48 89/49
Piano et al[12] Italy, University Hospital plus Private Care Center 2011-2014 RCT > 72 Only NSP, 31 cases
Salerno et al[26] Italy, multicenter 2007-2009 PC > 48 24/32
Lutz et al[27] Germany, University Hospital 2012-2016 PC > 48 63/29

N-SP: Nosocomial spontaneous peritonitis; RC: Retrospective cohort; PC: Prospective cohort; RCT: Randomized controlled trial.

Table 2.

Study characteristics (part 2) n (%)

Ref. N-SP culture-positive/N-SP total N-SBP/N-SFP N-SBP by GPB/culture-positive N-SPB N-SPB by MDR bacteria/culture-positive N-SPB N-SBP by MDR-GPB/N-SBP by GPB N-SBP by MDR-GNB/N-SBP by GNB
Song et al[20] Only culture positive cases 32/0 NA NA NA 12/18 (66.6)1
Cheong et al[21] Only culture positive cases 123/3 37/119 (31.0) NA NA 23/82 (28.0)
Fernández et al[22] (first cohort) NA 32/0 NA 7/32 (21.9) NA NA2
Fernández et al[22] (second cohort) NA 7/0 NA 2/7 (28.5) NA NA3
Chaulk et al[23] NA 17/0 NA 7/17 (41.1) NA NA
Li et al[24] Only culture positive cases 92/7 27/92 (29.3) 29/62 (46.8)4 7/19 (36.8)5 22/43 (51.2)6
Friedrich et al[25] NA 81/8 37/118 (31.3) 59/81 (72.8) NA NA
Piano et al[12] 16/31 (51.6) 16/0 10/16 (62.5) 6/16 (37.5) 3/6 (50.0) 3/10 (30.0)
Salerno et al[26] NA 24/0 NA 6/24 (25.0) NA NA
Lutz et al[27] 30/63 (47.6) 29/1 14/29 (48.2) 9/30 (30.0) NA NA
1

Resistance data only about Escherichia coli;

2

All cases of multidrug-resistance were related to Gram-negative bacteria;

3

All cases of multidrug-resistance were related to Gram-negative bacteria;

4

Data only about Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, Enterococcus spp.;

5

Data only about Staphylococcus aureus and Enterococcus spp.;

6

Data only about Escherichia coli and Klebsiella pneumoniae. N-SP: Nosocomial spontaneous peritonitis; N-SBP: Nosocomial spontaneous bacterial peritonitis; N-SFP: Nosocomial spontaneous fungal peritonitis; GBP: Gram-positive bacteria; GNB: Gram-negative bacteria; NA: Not available.

The included studies clearly shows the emerging patterns of third-generation cephalosporins resistance in causative bacteria of N-SBP. In the study of Piano et al[12] only 60% of Gram-negative bacteria are susceptible to third-generation cephalosporins; enterococci (24%) and staphylococci (19%) are the most commonly Gram-positive bacteria isolated. In the study of Friedrich et al[25] the overall percentage of enterococci (26.1%) is similar and they are intrinsically cephalosporin-resistant. The rate of MRSA, among Staphylococcus aureus strains, is as high as 85.7% in the study of Li et al[24]. Resistance of Enterococcus spp. to ampicillin varies from 37.5%[12] to 75%, with a 8.3% of VRE[25]. The rate of ESBL among Enterobacteriaceae ranged from 28%[21] to 51.2%[24]. The proportion of ESBL among specific strains such as E. coli can be as high as 66.7%[20].

DISCUSSION

Bacterial infections represent a relevant complication of cirrhosis, especially in hospitalized patients[28]. Moreover, infections are the key driver of the so-called acute-on-chronic liver failure[29], defined by a recent consensus as a syndrome in patients with advanced liver disease characterized by acute decompensation provoking liver failure and at least one extrahepatic organ failure, resulting in an increased short-term mortality[30] A prompt recognition, allocating the patient in the proper care setting[31], and an adequate treatment of the precipitating factor are essential to improve patients’ outcomes[32]. SBP-associated septic shock has a poor prognosis (mortality 80%). Appropriate antimicrobial therapy should be given as soon as possible: non-administration corresponds to an increase of 1.86 times hospital mortality per hour[33].

Over the last years, a new threat has emerged with respect to bacterial infections in cirrhosis in the form of the changing epidemiological pattern (increase of Gram-positive bacteria) and the rise of antimicrobial resistance[34]. Possible reasons for this phenomenon were the large preventive use of quinolones and the growing degree of instrumentalization of the cirrhotic patient, especially in the nosocomial context[35].

Unfortunately, even the most authoritative guidelines[5,36] relying on outdated microbiological data, do not provide a useful guidance. They still support the use of third-generation cephalosporins for SBP, taking into account the risk of infections by MDR bacteria or the difference between nosocomial and community-acquired forms[37]. On the contrary, a position statement in 2013 by the European Association for the Study of the Liver recommended different therapeutic options according to the onset of the infection, namely third-generation cephalosporins for community-acquired infection and piperacillin/tazobactam or meropenem plus daptomycin for nosocomial episodes[3]. Experts recommend cephalosporins[4] or piperacillin/tazobactam, meropenem ± glycopeptide[14].

Piperacillin/tazobactam is inadequate therapy for patients with life-theatering infections due to ESBL-producing Enterobacteriaceae[38,39].

Meropenem is carbapenem antibiotic which has excellent bactericidal activity in vitro against ESBL-producing Enterobacteriaceae. Breadth of spectrum is due, in part, to stability to all serine-based beta-lactamases, including those which hydrolyse third-generation cephalosporins. Meropenem is poorly active against staphylococci and enterococci[40].

Glycopeptides active against MDR Gram-positive cocci give concerns owing to the potential risk of nephrotoxicity. The rate of acute kidney injury is higher in patients with concomitant acute liver failure, which may be related to hemodynamic instability or development of hepatorenal syndrome[41]. Furthermore, when teicoplanin is administered intravenously at 10 mg/kg of body weight, low concentrations are achieved in peritoneal fluid[42].

Daptomycin is a lipopeptide active against MDR Gram-positive pathogens, including drug-resistant and drug-susceptible Staphylococcus aureus and VRE[43]. Decreased susceptibility to daptomycin (DAPR) reported in MRSA is frequently accompanied with a paradoxical decrease in beta-lactam resistance, a process known as the “see-saw” effect. Despite the observed discordance in resistance phenotypes, the combination of daptomycin/beta-lactams has been proven clinically effective for the prevention and treatment of infections due to DAPR-MRSA strains[44]. Therefore Daptomycin in monotherapy does not seem to be the treatment of choice for SBP due to MRSA[45].

In conclusion, third-generation cephalosporins have poor microbial coverage for treatment of N-SBP. Cirrhotic patients with N-SBP in clinical setting with high prevalence of VRE, MRSA, ESBL should receive as empirical antibiotic therapy: High dose of Daptomicyn (i.e., 8-12 mg/kg per 24 h) plus Meropenem (i.e., 1 g/8 h) plus a β-lactam active against MRSA[46].

When the culture is positive and susceptibility data are available an antibiotic with a narrower spectrum should be promptly initiated (early de-escalation strategy); this in the case of the individuation of non-MDR bacteria limits the selection of antibiotic resistances[47].

In areas with high prevalence of MDR bacteria, the late start of Broad-Spectrum EAT for N-SBP should be discouraged[48].

ACKNOWLEDGMENTS

The authors deeply thank Dr. Muhammed Niyas (MBBS, MD, DNB), Senior Resident in Infectious Diseases at All India Institute of Medical Sciences of New Delhi (AIIMS, India), for his valuable pro bono help in revising the manuscript in order to improve and polish language.

COMMENTS

Background

Spontaneous bacterial peritonitis (SBP) is one the most frequent type of infection in cirrhotic patients. Bacterial infections remarkably worsen the prognosis of these subjects, in case of not adequate treatment. The therapeutic choice has become increasingly difficult in the light of the growing importance of multidrug-resistant (MDR) bacteria as causative agents of bacterial infections in patients with advanced liver disease.

Research frontiers

This is the first systematic review aimed at summarizing the evidence from literature concerning the epidemiology of nosocomial cases of SBP, in order to highlight the importance of MDR bacteria.

Innovations and breakthroughs

This systematic review, focused on SBP, confirms the epidemiological change involving bacterial infections in cirrhotic patients as whole, namely the rise of Gram-positive isolates, and, more alarming, the notable increase of MDR bacteria among nosocomial cases.

Applications

The results of this systematic review suggest that the burden of MDR bacteria as causative agents of nosocomial SBP is worrisome. Further studies, especially randomized clinical trials, are warranted so as to understand the best treatment of these cases. In the meanwhile, the use of broad-spectrum agents as empiric therapy is a prudent and reasonable choice, especially in settings where resistance rate is high.

Peer-review

The authors did clearly represent the current problematics in the field of nosocomial spontaneous peritonitis and its possible solutions with the proposition of new guidelines. It provides very useful information for clinicians.

Footnotes

Manuscript source: Invited manuscript

Specialty type: Gastroenterology and hepatology

Country of origin: Italy

Peer-review report classification

Grade A (Excellent): 0

Grade B (Very good): B

Grade C (Good): 0

Grade D (Fair): 0

Grade E (Poor): 0

Conflict-of-interest statement: None of the authors have any conflict of interest in connection with this study.

Data sharing statement: Electonic data regarding the file of retrieved studies are available from the corresponding author at marco.fiore@hotmail.it.

Peer-review started: December 30, 2016

First decision: March 16, 2017

Article in press: June 19, 2017

P- Reviewer: Knehtl M S- Editor: Gong ZM L- Editor: A E- Editor: Zhang FF

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