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Schena, C.A.;  De’angelis, G.L.;  Carra, M.C.;  Bianchi, G.;  De’angelis, N. Infections in Acute Care Surgery. Encyclopedia. Available online: https://encyclopedia.pub/entry/40760 (accessed on 25 April 2024).
Schena CA,  De’angelis GL,  Carra MC,  Bianchi G,  De’angelis N. Infections in Acute Care Surgery. Encyclopedia. Available at: https://encyclopedia.pub/entry/40760. Accessed April 25, 2024.
Schena, Carlo Alberto, Gian Luigi De’angelis, Maria Clotilde Carra, Giorgio Bianchi, Nicola De’angelis. "Infections in Acute Care Surgery" Encyclopedia, https://encyclopedia.pub/entry/40760 (accessed April 25, 2024).
Schena, C.A.,  De’angelis, G.L.,  Carra, M.C.,  Bianchi, G., & De’angelis, N. (2023, February 02). Infections in Acute Care Surgery. In Encyclopedia. https://encyclopedia.pub/entry/40760
Schena, Carlo Alberto, et al. "Infections in Acute Care Surgery." Encyclopedia. Web. 02 February, 2023.
Infections in Acute Care Surgery
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This entry is adapted from the peer-reviewed paper 10.3390/antibiotics11101315

The burden of infections in acute care surgery (ACS) is huge. Surgical emergencies alone account for three million admissions per year in the United States (US) with estimated financial costs of USD 28 billion per year. Acute care facilities and ACS patients represent boost sanctuaries for the emergence, development and transmission of infections and multi-resistant organisms.

infections acute care surgery antimicrobial resistance source control

1. Introduction

Acute care surgery (ACS) is traditionally represented by a triad composed by trauma, emergency general surgery, and surgical critical care [1]. It was conceived with the goal of combining skills from trauma surgeons, emergency surgeons, and intensivists, into a single multifaceted and comprehensive discipline. Later, both elective general surgery and surgical rescue were proposed as two additional pillars of ACS [2].
The epidemiological impact of ACS is important because of the cumulative amount of emergency and trauma surgery related morbi-mortality. The burden of surgical emergencies is high; of the three million emergency admissions per year in the United States (US) approximately 30% requires surgery [3], with 896,000 deaths reported in 2010 [4]. Moreover, trauma constitutes the first cause of death in patients under 44 years of age and the fourth cause in the elderly [5]. The estimated financial burden of emergency surgery in US is USD 28 billion every year and is expected to increase up to USD 41 billion by 2060 [6][7]. Despite clinical and financial improvements after ACS model implementation and diffusion [8], ACS patients continue to represent a high-risk population experiencing poorer outcomes. Indeed, up to one-third of ACS patients present with multiple comorbidities and frailty. Emergency surgery is associated with higher rates of mortality, postoperative complications, hospital readmissions, and costs, when compared to corresponding elective procedures [9][10][11][12]. The incidence of healthcare-associated infections (HAIs) is doubled in patients undergoing surgical procedures [13]. In this complex scenario, intra-abdominal and healthcare-associated infections have a great impact, taking into account the critical conditions leading to ACS and the scarce physiologic reserve of these patients. Thus, a close cooperation between the acute care surgeon and the healthcare system is necessary to put in place a comprehensive evidence-based management of infections in the ACS setting, prevent adverse outcomes, and optimize treatment efficacy.

2. The Management of Infections in Acute Care Surgery

The global public health challenge driven by infections in ACS refers either to patient morbidity, mortality, and quality of life, and further to financial and economic reverberations. In this perspective, the impact of HAIs and IAIs is wide.
HAIs are infections developed 48 hours or more after hospital or other healthcare facility admission, or within 30 days after having received health concerns [14]. HAIs encompass surgical site infections (SSI), catheter-associated urinary tract infections, central line-associated bloodstream infections, Clostridium difficile infections, and ventilator-associated pneumonia, among many others. Acute care facilities and ACS populations represent boost sanctuaries for emergence, development, and transmission of infections and multi-resistant organisms. The use of medical devices, such as ventilators, central venous catheters, intra-abdominal drains, and urinary catheters, but also the surgery itself, should be considered as significant risk factors for HAI acquisition. Despite the considerable predictability of HAIs, their epidemiological weight is significant. In 2011, the World Health Organization (WHO) reported that HAIs affect 7% of hospitalized patients in developed and 10% in developing countries, leading to a burden of 4 million cases in Europe and 1.7 million in US with 39,000 and 99,000 directly attributable deaths, respectively [15]. SSIs are the most common HAI in surgical units with a major impact in terms of morbidity, mortality, length of hospital stay, and costs [16]. In a multicentre and international cohort study, SSIs were identified in 12.3% of patients within 30 days after gastrointestinal surgery and disease incidence fluctuated significantly between countries with high, middle, and low-income (9.4% vs. 14.0% vs. 23.2%, respectively, p < 0.001) [17]. Additionally, Magill et al. highlighted that AMR patterns were detected in up to 60% of the microbes isolated from infected surgical sites [18].
IAIs are common surgical emergencies and represent an important cause of morbidity and mortality worldwide. In the modern era, the IAIs-related mortality has dropped sharply compared to the values higher than 50% reported in the middle of the last century [19]. Indeed, Sartelli et al. reported an overall 9.2% mortality rate in a multicenter cohort of 4553 patients with complex intra-abdominal infections over 4 months [20]. Moreover, the presence of severe sepsis considerably increased IAI mortality rate [21][22][23]. A multicentre observational study on ICU patients with a confirmed IAI diagnosis attested that 68% of IAIs were hospital-acquired, with an overall AMR prevalence of 26.3%, and overall mortality of 29.1% directly related to infection severity [24]. IAIs include appendicitis, bowel and colorectal perforations, cholecystitis, diverticulitis, gastroduodenal perforations, bowel and colorectal ischemia, necrotizing pancreatitis, and many other diseases. Despite the wide spectrum of conditions, IAIs are usually classified into uncomplicated and complicated. Uncomplicated IAIs refer to infections limited to a hollow viscus, whereas complicated IAIs presuppose the involvement of a naturally sterile area of the abdomen, such as the peritoneal cavity, other abdominal organs, abdominal wall, mesentery, and retroperitoneum [25]. Differently, the US Food and Drug Administration defined the latter as disorders requiring SC procedures, with the aim to better clarify the definition and identification of complicated IAIs. In principle, uncomplicated IAIs can be handled with either surgical SC or with antibiotics alone, while complicated IAIs require both SC and antibiotic therapy [26]. For instance, complicated IAIs may include secondary or tertiary peritonitis, intra-abdominal abscesses, or intra-abdominal phlegmons.
Worldwide, hospital and patient cares require comprehensive and standardized policies, procedures, and strategies, to minimize the impact of HAIs and AMR, and to optimize IAI treatment. AS, IPC, and SC, are the three synergistic cornerstones of the multidisciplinary management of infections in acute care facilities (Figure 1).
Antibiotics 11 01315 g001
Figure 1. The three pillars of patient care against infections and antimicrobial resistance.

2.1. Source Control

SC in ACS refers to any intervention necessary to identify and eliminate the sources of infection and finally to restore normal physiological balance [27]. Combined with targeted antibiotic therapy, it represents one of the fundamentals of IAI care [26]. Delayed and partial interventions may significantly worsen SC outcomes in IAI patients; thus, prompt and goal-directed tactics are pivotal concepts to achieve the maximal efficiency of SC [19]. Sartelli et al. recently defined the four rules of an ideal SC [26]:
  • (First) Time: start as soon as possible;
  • Totalization: remove any infective source;
  • Technique: use adequate techniques;
  • (Second) Time: avoid clinical deterioration through required or planned successive procedures.
The first cornerstone is thereby the control of foci of infection within the shortest delay possible, especially in critically ill patients [28]. Elsewise, the optimal timing of IAI SC has long been debated [29]. Azuhata et al. showed the negative impact of each hour delay on survival in patients with gastrointestinal perforation and septic shock [30]. The 2017 Surgical Infection Society Revised Guidelines indicated that SC interventions must be undertaken within 24 hours from the diagnosis of IAI, except in the case of clinical evidence supporting non-interventional or delayed approach, as appropriate (strength of the recommendations: Grade 2-B), and in the case of sepsis or septic shock always seeking immediate treatment (strength of the recommendations: Grade 2-C) [25]. The same suggestion emerged from a comprehensive European review [31] and an international multi-society document on IAI [26]. According to the Surviving Sepsis Campaign guidelines, any specific anatomic diagnosis of infection requiring emergent SC should be rapidly identified or excluded and any essential SC intervention should be implemented [32].
The second cornerstone is the completeness of SC. Several studies highlighted the association between incomplete interventions and severe adverse outcomes [29][33][34][35]. Indeed, the persistence of infected fluid or contaminated tissue may nullify the benefits of resuscitation and antimicrobial therapy and prevent the physiological recovery. Van de Groep et al., investigating on a large cohort of critically ill patients with IAI, reported approximately 50% of infection persistence or recurrence after the first SC with a median of three procedures per patient and 67% SC adequateness on day 14 [36]. SC failure may occur in more than one-in-five patients [25] and in this scenario a prompt abdominal re-exploration should strongly be considered [19][26].
The selection of the optimal SC intervention should consider the risk-benefit ratio of the procedure, the site and severity of the infection, the patient’s fitness and health state, the medical expertise, and the surgical, interventional, or diagnostic staff availability. SC encompasses many procedures, namely drainage of abscess or infected collection, debridement of infected or necrotic tissue, removal of an infected device, and definitive control of the microbial source (e.g., resection of infected organs–appendicitis, cholecystitis, bowel ischemia – and suture or resection of perforated viscus–gastric and duodenal perforation, perforated diverticulitis). The international WISS study pointed out the source of infection in 4553 patients from 132 hospitals over a 4 month period, as follows: 34.2% appendicitis, 18.5% cholecystitis, 11% gastroduodenal perforations, 8.5% postoperative, 5.9% non-diverticular colonic perforation, 5.4% small bowel perforation, 5.2% diverticulitis, 2.5% post-traumatic perforation, 1.1% pelvic inflammatory disease, and 7.7% other [20].
Techniques to achieve SC encompass primary and alternative interventions which should be selected according to severity and stage of the disease, patients’ characteristics, and hospital resource availability (Table 1).
Table 1. Source control strategies for most common intra-abdominal infection scenarios.
Primary Intervention Alternative Intervention
Acute appendicitis [28][37][38][39]
Appendectomy via laparoscopy is the preferred approach for both uncomplicated and complicated (perforation and peri-appendiceal abscess) acute appendicitis
  • The antibiotic-first strategy is a feasible option in selected patients with uncomplicated acute appendicitis illustrating the risk of failure and misdiagnosis
  • Percutaneous drainage could be a reasonable option in case of appendicitis with peri-appendiceal abscess and phlegmon
Acute cholecystitis [40][41][42]
  • Laparoscopic cholecystectomy is recommended for source control in case of timeliness clinical onset (<7–10 days), peritonitis or sepsis
  • Subtotal cholecystectomy is an alternative technique for advanced inflammation, gangrenous gallbladder, or difficult anatomy
  • Antibiotics and delayed cholecystectomy (beyond 6 weeks from the first clinical onset) are preferred in non-adequate clinical onset (>7–10 days)
  • Percutaneous cholecystostomy drainage or endoscopic transpapillary gallbladder drainage or ultrasound-guided transmural gallbladder drainage should be considered as surgical alternatives in patients unfit for surgery (e.g., severe comorbidities or septic shock)
Gastroduodenal perforation [43]
  • Operative source control is indicated in presence of significant pneumoperitoneum or extraluminal contrast extravasation or signs of peritonitis
  • Laparoscopy in the preferred approach in stable patients
  • Primary repair is recommended for perforated peptic ulcer smaller than 2 cm
  • Resection or repair ± pyloric exclusion ± external bile drainage should be considered in case of perforated peptic ulcer > 2 cm
  • Resection with contextual operative frozen pathologic examination is advisable in case of malignancy suspicion
 Non-operative management could be considered in extremely selected cases with sealed perforation confirmed on water-soluble contrast imaging. It consists of the association of absolute fasting + antibiotics + decompression via nasogastric tube + proton pump inhibitor therapy and requires a follow-up endoscopy at 4–6 weeks.
Postoperative peritonitis [26]
Prompt surgical management is mandatory in case of diffuse peritonitis Antibiotics + percutaneous drainage should be considered for localized intra-abdominal abscesses in stable patients with no signs of generalized peritonitis
Small bowel perforation [26]
  • Primary repair is an option in selected patients with minimal peritoneal contamination and small defect, while bowel resection ± anastomosis is indicated in remaining cases
  • Stoma creation or perforation exteriorization is indicated in case of critical illness or severe inflammation/peritonitis and edema of the bowel
 In case of small bowel ischemia, resection and delayed anastomoses should be considered as alternative
Diverticulitis [44][45][46]
  • Oral or intravenous antibiotics are indicated in hemodynamically stable patients without drainable collection, pericolic extraluminal gas or small (< 4–5 cm) diverticular abscess. It should also be considered in case of CT findings of distant free gas without diffuse intra-abdominal fluid, only if a close follow-up can be guaranteed
  • Primary resection with anastomosis with or without diverting stoma is recommended in clinically stable patients without comorbidities
  • Hartmann’s procedure is recommended for 1) diffuse peritonitis and critically ill patients in case of hemodynamically stability; 2) frail patients with sepsis and temporary hemodynamic instability returning to normal pressure after crystalloid infusion
  • Damage control surgery is indicated for hemodynamic instable patients unresponsive to fluid administration and an open surgical approach is mandatory
  • Percutaneous drainage is recommended in hemodynamically stable patients with large abscesses
Esophageal perforation [47]
Antibiotics + absolute fasting + proton pump inhibitor therapy can be indicated in stable patients with early onset, minimal esophageal damage, and contained contamination, if highly specialized surveillance is guaranteed Surgery should be advised in absence of non-operative management criteria (e.g., hemodynamic instability)
Acute cholangitis [26]
Antibiotics + biliary drainage via endoscopic retrograde cholangiopancreatography (treatment of choice) or percutaneous biliary drainage (in case of ERCP * failure) are the first-line approach Open drainage should be considered only in case of failure or contraindication to endoscopic or percutaneous interventions
The primary goal of SC interventions is to identify the origin of IAI and to control the cause of abdominal sepsis. Peritoneal fluid cultures should be reached during SC procedures with the purpose of guiding antimicrobial therapy on the basis of antibiogram. Recent evidence reported the growing identification of multidrug-resistant microbes in IAI, thereby AMR may represent a determining factor for SC failure [48][49][50]. In the setting of complicated IAIs, a short-course antimicrobial therapy following an adequate SC intervention is a proper strategy for complicated IAIs, while it is not required for uncomplicated IAIs, such as uncomplicated cholecystitis or appendicitis [19][51][52][53][54]. The empiric antimicrobial therapy for complicated IAIs should be started as soon as possible and drug choice should be based on local ecology and AMR data, preferring antimicrobials with a spectrum of action against Enterobacteriaceae, enteric streptococci and obligate enteric anaerobes [19][25][26][32][33][55]:
  • Amoxicillin/clavulanate should be considered for empiric therapy in accordance with local AMR epidemiology, because the emergence of extended-spectrum beta-lactamases (ESBL) producing Enterobacteriaceae has reduced its efficacy [56][57][58][59][60];
  • Piperacillin/tazobactam is considered the optimal option for the treatment of complicated IAIs due to its broad spectrum of efficacy against Enterobacteriaceae, Pseudomonas, anaerobes, non-resistant Enterococci and certain classes of ESBL [59][61][62];
  • Third-generation cephalosporines (e.g., cefotaxime, ceftriaxone, ceftazidime) in combination with metronidazole are active against Enterobacteriaceae and may be considered for uncomplicated IAIs [60][63]. Recently, two fifth-generation cephalosporines, namely ceftolozane/tazobactam and ceftazidime/avibactam, have been approved as treatments for complicated IAIs in combination with metronidazole, given to their action against several multidrug resistant bacteria [64][65][66];
  • Carbapenems (imipenem, meropenem, ertapenem) have a broad spectrum of action and represent a useful resource against ESBL [60][67][68];
  • Aminoglycosides (e.g., amikacin, tigecyclin) should be considered in case of beta-lactam allergy due to controversies on their toxic side effects [19][25][60][69].
Empirical antimycotic therapy may be appropriate in selected conditions (hospital-acquired IAIs, immunosuppressive state, critical illness) [19][70].
According to the Surgical Infection Society, microbiologic data and antibiogram can be used to reassess and optimize antimicrobial therapy [25]. Furthermore, the adequateness and appropriateness of antimicrobial treatment should be re-thought daily [71]. Concerning surgical SC, the usefulness of a prophylactic drain placement after digestive surgery has long been debated [72][73][74]. Intra-abdominal drains paradoxically may promote surgical site infections [75] and increase hospital length of stay and costs [76][77] in several emergency scenarios, namely acute appendectomies, or cholecystectomies. De Waele et al. recommended a limited duration of abdominal drains in the treatment of abdominal sepsis, a prompt drain removal once the source has been controlled, and to avoid culturing drains upon removal [78].
In principle, less invasive and more effective procedure should be chosen to reach SC [25]. During the last decades, minimally invasive surgery has gained wider acceptance in the treatment of IAI and abdominal sepsis ensuring concomitant advantages of diagnostic and operative tools with better post-operative outcomes (e.g., decreased postoperative infections and pain, shorter hospital stay and earlier recovery of physiological functions). Indeed, several authors recognized a laparoscopic and robotic approach as feasible, effective, and safe techniques for many emergency conditions [79][80][81][82]. Despite the clear advantages, minimally-invasive surgery in acute care setting requires adequate technical skills and specialized training.

2.2. Infection Prevention and Control

Infection prevention and control (IPC) is a pragmatic, evidence-based approach, which primary goal is preventing patients and health workers acquisition of HAIs, reducing the spread of HAIs within health care facilities, and weakening AMR [83]. For this purpose, the WHO issued several recommendations, defined as core components [83], and their respective minimum requirements [84] to ensure the effectiveness of IPC programs at national and facility level. The implementation of IPC core components should be faced using a stepwise approach [85], according to the following five steps:
  • Preparing for action;
  • Baseline assessment;
  • Developing and executing an action plan;
  • Assessing impact;
  • Sustaining the program over the long term.
IPC is a multidisciplinary strategy that involves all levels of the health system and different hospital professionals. According to the systematic review by Zingg et al., an adequate IPC programme in an acute care hospital must include as a minimum standard at least one dedicated and specialized infection-control nurse, a dedicated physician trained in IPC, and microbiological and data management support [86]. A recent worldwide cross-sectional survey on this topic revealed that a multidisciplinary IPC team composed by a median of six professionals (including most frequently microbiologists 72.4%, infectious diseases specialists 70.2%, nurses 68.4%, pharmacologists 67.6%, and surgeons 56.7%) was present in about 90% of participating hospital [87].
The effective implementation of infection control programs requires the engagement of well-designed organizational and structural models: specifically, ward occupancy have not to exceed its planned capacity; health-care workload must be adapted accordingly; and dedicated full-time nurses and physicians should be preferred over pool or agency professionals [86]. Indeed, several studies showed the association between HAIs and bed occupancy, high workload, and pool or agency professionals [88][89][90][91][92]. Furthermore, the usability of IPC programs is closely related to the development of multimodal strategies for team education and training, allowing the transposition of IPC pivotal fundamentals into documents and protocols based on local context and facilitating the good daily practice through surveillance, auditing, and personal feedback [86].
SSIs account for most HAIs among surgical patients. Additionally, SSIs are associated with longer hospitalization, higher costs, morbidity, and mortality [16], thus SSI prevention has a crucial role in all surgical departments worldwide. During the last years, the WHO [93][94][95], the US CDC [96] and the National Institute for Health and Care Excellence (NICE) [97], published evidence-based guidelines for the prevention of SSIs, dispensing recommendations for both preoperative, intraoperative, and postoperative surgical phase. The common goal of all these health institutions is to standardize patient care through the identification of the best practice, so promoting a favorable fallout on morbidity, mortality, and costs. The most recent WHO strong recommendations are reported in Table 2.
Table 2. WHO strong recommendations for the prevention of surgical site infection *.
Core Topics
Perioperative intranasal applications of mupirocin 2% ointment with or without a combination of chlorhexidine gluconate body wash is indicated in patients undergoing cardiothoracic and orthopedic surgery with known nasal carriage of Staphylococcus aureus
Surgical antibiotic prophylaxis should be administered within 120 minutes before surgical incision, even though considering antibiotic half-life
Mechanical bowel preparation should not be used for the prevention of SSI in elective colorectal surgery if not associated with preoperative oral antibiotics
Hair removal and shaving is strongly discouraged in any surgical procedure. If inevitable, hair should be removed only with a clipper
Alcohol-based antiseptic solutions based on chlorhexidine gluconate are recommended for surgical site skin preparation before surgery
Surgical hand preparation should be performed by scrubbing with either a suitable antimicrobial soap and water or using appropriate alcohol-based solutions before wearing sterile gloves
Prolongation of surgical antibiotic prophylaxis after the surgical procedure is not indicated for the purpose of preventing SSI

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Subjects: Infectious Diseases
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Carlo Alberto Schena
,
Gian Luigi de’Angelis
,
Maria Clotilde Carra
,
Giorgio Bianchi
,
Nicola de’Angelis
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Revisions: 2 times (View History)
Update Date: 02 Feb 2023
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