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Clostridioides difficile infection in intensive care units in nursing practice

Izabela Fajfer-Gryz
1
,
Ilona Nowak-Kózka
2, 3
,
Joanna Rudek
4

1.
Clinical Department of Angiology, University Hospital, Krakow, Poland
2.
Department of Anaesthesiology and Intensive Therapy, University Hospital, Krakow, Poland
3.
Department of Medical Education, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
4.
Critical and Chronic Care Solutions, 3M Healthcare Business Group, Poland
Nursing Problems 2020; 28 (1): 12-18
Data publikacji online: 2020/06/15
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INTRODUCTION


Clostridioides difficile infection (CDI) develops in the large intestine, causing diarrhoea of varying severity – from mild diarrhoea to pseudomembranous colitis and toxic megacolon with intestinal perforation. C. difficile infection may lead to complications like partial or total surgical removal of the large intestine (colectomy), sepsis, and even death. Disruption of intestinal microflora after antimicrobial therapy has a decisive impact on the colonisation of the infection and the produced toxin. Transmission occurs in the faecal-oral route. Possible sources of infection include patients, hospital staff, visitors, medi-cal equipment, and the hospital environment [1-6]. This review article discusses the literature and current guidelines for limi-ting the spread of CDI in a hospital setting. Most of the data were collected by analysing current Polish and foreign literature from PubMed (Medline).

RISK FACTORS


There are several risk factors for CDI:
• antibiotic therapy (long-term, multi-drug),
• patient age (> 65 years),
• long hospitalisations,
• hospitalisation in an intensive care units (ICU),
• immunodeficiency (acquired or congenital),
• co-morbidities (e.g. chronic renal failure requiring dialysis),
• steroid therapy,
• chemotherapy [1-11].
The main factor in the development of disease caused by C. difficile is antibiotic use. According to some authors, in 10-30% of cases of post-antibiotic use diarrhoea can be attributed to C. difficile [12, 13]. This applies especially to broad-spectrum anti-biotics that are active against anaerobic bacteria and to which C. difficile is resistant. C. difficile diarrhoea is most commonly cau-sed by the following antibiotics: fluroquinolones, second- and third-generation cephalosporins, clindamycin, ampicillin, amoxicil-lin, and broad-spectrum penicillins with inhibitors (except for ticarcillin with clavulanate and piperacillin with tazobactam) [1, 3, 4, 14, 15]. It is important to remember that any antibiotic can cause C. difficile-associated diarrhoea.
Many studies have also shown a significant effect of proton pump inhibitors on the increase of CDI in patients receiving high-risk antibiotics [8, 16, 17].
Another significant problem in the treatment of patients is recurrent CDI, which may be caused by persistent resistant spo-res in the colon, an impaired immune response, or a change in normal intestinal microflora [18-20]. The recurrence of the di-sease occurs in 20-25% of patients [1].
Particular attention should be paid to critically ill patients who are at increased risk of developing diarrhoea. The disease makes treatment difficult, prolongs hospitalisation, but also exposes the patient to serious complications [21-23].

DIAGNOSIS


According to the European Centre for Disease Prevention and Control (ECDC), for the diagnosis of CDI one of the follo-wing conditions should be met:
• loose stools or the presence abnormal dilation of the large intestine and positively confirmed through microbiological te-sting for the presence of toxins A and/or B, or the presence of a C. difficile strain producing the toxin(s) detected in the sto-ol,
• the presence of pseudomembranous colitis determined in endoscopic examination,
• the presence of pseudomembranous colitis determined in histopathological examination [24].
Scales like the Bristol Stool Form Scale (BSF) or the Bliss Stool Chart may be useful in the assessment of stools; al-though, unfortunately, they are currently rarely used in ICUs [25, 26]. Apart from diarrhoea, symptoms of CDI may include the following: severe abdominal pain, fever, nausea, and vomiting. The above symptoms may lead to hypovolaemia, which is especially dangerous in ICU patients.
Diagnostic testing for CDI should be ordered based on the above criteria. Routine testing in ICU patients or medical per-sonnel is not recommended due to a high incidence of asymptomatic carriers. It is also not recommended to perform repeated tests during the same episode of diarrhoea, or cure tests. A positive CDI test result should be immediately reported to the ho-spital infection control unit [27, 28].
The material used in testing for C. difficile is a liquid, unformed stool sample. The sample, collected in a sterile test tube (approximately 3-5 ml), should be delivered to the appropriate laboratory within two hours of collection, at room temperature. If it is not possible to deliver the material in such a short time, samples should be stored in a refrigerator (also during transport to the laboratory, which is not always obvious) at 4°C. The material can be stored for up to 72 hours in such a temperature, and if necessary, the sample can be frozen to –80°C. It is important to remember that storing the material in a refrigerator re-duces the number of vegetative cells. Further handling of the sample depends on the type of analysis to be performed [29-31].
The currently performed CDI diagnostic tests are screening tests that allow determination of the suspected infection, inc-luding: detecting the bacterial strain, or both toxins (A and B), or one of them, directly in a stool sample. The available CDI diagnostic tests are based on: toxigenic culture (TC), molecular tests (nucleic acid amplification test – NAAT), testing for glu-tamate dehydrogenase (an enzyme produced in large quantities by all toxin-releasing strains, as well as by strains that do not release toxins, making it an excellent diagnostic marker), cytotoxicity tests (CCNA), and enzyme immunoassays towards toxins A and B [3, 27].

EPIDEMIOLOGY


The spread of CDI is a serious epidemiological problem in a hospital setting. This is related to the emergence of new strains that are resistant to multiple antibiotics [3, 32, 33]. The B1/NAP1/027 strain is particularly virulent, causing infec-tions with a much more severe clinical course and higher mortality than prior strains. It is characterised by a high degree of resistance to antibiotics, increased ability to form spores, higher production of toxins A and B (16 and 23 times more than other strains, respectively), as well as production of an additional binary toxin [3, 34]. In the conducted studies, an increase in the incidence of C. difficile infections caused by the NAP1 strain was found in several hospitals; for example, in 2005 there was an increase from 10 cases to 33 cases per 100,000 patients [3, 32]. A study conducted in 2014 in 20 EU countries found an average of seven cases of CDI per 10,000 patient days of hospitalreation [3, 35], while in 2016, according to the ECDC, there were already 7.4 cases per 10,000 patient days [6, 36].
According to data collected by the Polish National Institute of Public Health – National Institute of Hygiene (Narodo-wy Instytut Zdrowia Publicznego – Państwowy Zakład Higieny – NIZP-PZH), the incidence of CDI is growing also in Poland – in 2016 there was an average of 22.7 cases per 100,000 inhabitants, while in 2017 this rate was already at 30.4 cases per 100,000 inhabitants [37]. As a result of research conducted in 2011-2013, covering 13 cities in Poland, it was found that the most common cause of CDI was strain B1/NAP1/027, which accounted for 62% compared to other stra-ins [38]. However, the same type of strain in 2017 caused 80% of cases in Silesia [39].

TREATMENT


According to guidelines issued by the Infectious Diseases Society of America (IDSA) and Society for Healthcare Epi-demiology of America (SHEA), CDI should be treated with orally administered vancomycin (dose 125 mg four times per day) or fidaxomicin (dose 200 mg twice a day) for 10 days [27]. If there is no improvement within 48 hours, the dose of vancomycin can be increased up to 500 mg four times per day [40]. In cases of mild infections or if vancomycin or fi-daxomicin is not available, metronidazole (500 mg three times daily for 10 days) may be administered [4, 41]. Due to its cumulative and neurotoxic effects metronidazole treatment should not be repeated or prolonged. In cases of fulminant CDI with hypotension or shock, obstruction, or megacolon, additional rectal administration of vancomycin (500 mg every six hours) should be considered, and, additionally, metronidazole treatment should be also introduced [27]. In patients with recurrent infections, intestinal faecal microbiota transplantation (FMT) is recommended. Treatment involves administering a human stool from a healthy donor to the intestine of a sick patient to restore normal intestinal microflora. The most common methods of stool administration are retention enema, colonoscopy, and infusion through a nasogastric tube. Faecal transplant is a low-cost, low-risk, highly effective treatment [42].

PREVENTION


A basic and, at the same time, the most difficult (especially in ICU environments) means of reducing the risk of C. difficile infections is to reduce the number of antibiotics used.
The rapid spread of C. difficile infections is highly dangerous for patients in ICUs, causing deterioration of health through severe complications and even death.
Due to frequent infectious complications, and the resulting treatment with broad-spectrum antibiotics, these patients are particularly vulnerable to the spread of drug-resistant microorganisms. Nurses who have direct contact with the patient, per-form many activities with the patient (e.g. body toilet), or take part in many procedures and tests (e.g. in the pharmacothera-py or FMT) play a significant role in preventing the transmission of infections. Table 1 is a summary of key aspects of CDI in ICU in nursing practice. In order to prevent C. difficile infections, it is very important to take appropriate measures, which include:
• hand hygiene and use of personal protective equipment,
• patient isolation,
• maintaining cleanliness with disinfection,
• infected patient care,
• education of visitors,
• surveillance.

HAND HYGIENE AND PERSONAL PROTECTIVE EQUIPMENT


According to the World Health Organisation (WHO), the key element in prevention of hospital infections is proper hand hygie-ne and the application of the “five moments for hand hygiene” rule: before touching a patient, before clean/aseptic procedures, after body fluid exposure/risk, after touching a patient, and after touching the patient’s surroundings [43]. It is estimated that the most common cause (60-90%) of infections is the transmission of pathogens present on the hands of medical personnel [44].
According to current Centers for Disease Control and Prevention (CDC) recommendations, in the case of a patient with CDI, hand hygiene should be performed routinely and in endemic situations before and after contact with the patient and after re-moving gloves.
It is strongly recommended to perform hand hygiene, routinely and in endemic situations, through washing with soap un-der running water or disinfecting with an alcohol-based hand rub [3].
However, if there is an epidemiological outbreak or a high incidence rate of CDI, or in the case of direct contact with fae-cal flora, soap or chlorhexidine-based sanitisers should be used for hand hygiene [45]. Soap and/or chlorhexidine preparations remove spores more effectively compared to alcohol-based hand sanitisers. Additional barriers such as disposable gloves and gowns should also be used to reduce the spread of infection. Personal protective equipment should be used when entering the patient’s room and during any activities performed with the patient and in their environment [3].

PATIENT ISOLATION


Contact isolation is aimed at preventing the spread of infections through direct contact (between staff and the patient, be-tween patients, and between the environment and patients) and indirect contact (e.g. through shared equipment) [46].
In cases of suspicion or diagnosis of CDI, contact isolation of the patient (room with airlock) should be implemented. If the use of a single-patient room is not possible, especially in the ICU, where patients are often hospitalised in multi-bed ro-oms, it is recommended that a dedicated isolation space within the patients’ room is separated [47]. In the case of isolation in multiple-patient rooms, it is strongly recommended by the IDSA and SHEA to separate patients with C. difficile from patients colonised simultaneously with various multiresistant microorganisms, e.g. MRSA (Staphylococcus aureus) and VRE (Entero-coccus spp.) [27, 28]. Unfortunately, according to the reports of the Polish Supreme Audit Office (Najwyższa Izba Kontroli, NIK) and studies performed in many centres in Poland, it appears that over 40% of all hospital infections, either recognised at admission or due to treatment complications, are recorded in patients hospitalised in ICUs [48, 49]. This is why presumptive isolation of patients in whom C. difficile is suspected or while awaiting diagnostic test results is so important. Contact isola-tion should be continued for at least 48 hours after diarrhoea is resolved and can be maintained until the patient is discharged, especially if there is an increased incidence rate in the unit [3]. It is also advised that transport of CDI patients is limited, al-though this is often impossible in the case of patients in critical condition requiring proper imaging diagnostics. If a patient is discharged to another ward or to another hospital, thorough information should be provided by medical staff at discharge abo-ut the suspicion or diagnosis of CDI and the need to implement appropriate procedures [45, 49].

MAINTAINING CLEANLINESS WITH DISINFECTION


The spread of CDI is largely associated with the production of spores, which are resistant to external factors like drying, and low or high temperatures. Therefore, it is strongly recommended to use disposable equipment. Multiple-use patient-care equ-ipment (blood pressure meter, pulse oximeter) can be dedicated for the patient infected with C. difficile – equipment after use should be decontaminated, for example, through sterilisation. Chlorine-based preparations are recommended for disinfection of surfaces. It is recommended that the patient’s room is cleaned and disinfected every day, as well as surfaces and equipment from the patient’s surroundings. Sporicidal agents should also be used for disinfection after patient discharge. Dirty personal and bed linen should be closed in a separate bag at the place of isolation [3, 45, 49].

INFECTED PATIENT CARE


In the case of diarrhoea, barrier preparations should be used, which form a protective layer and a screen between the skin and the liquid stool. In CDI spores are excreted in large quantities with faeces. Hence, proper care and maintenance of skin cleanliness in patients in critical condition are very important. The search for optimal solutions for care in patients with diarrhoea in intensive care units continues worldwide. Standards of conduct are aimed at creating safety for both the patient and the staff. One of the methods of nursing patients with diarrhoea in ICUs is the use of a closed system for controlled stool collection. The system consists of a soft, silicone sleeve, about 1.5 m long, equipped with a silicone, low-pressure balloon at one end, and at the other – with a flange for connecting to a collecting bag. The balloon is introduced through the anal sphinc-ter so that it is in the rectal bubble. The system is easy to use. Its use reduces the risk of skin damage through effective control and drainage of liquid faeces. It protects the skin against the harmful effects of faecal enzymes that damage the epidermis, increasing the risk of infections and of appearance of wounds around the anus. Using a closed system for controlled stool col-lection also reduces the risk of cross-contamination, saves the work time of medical personnel, and limits the amount of used dressings. The system also allows accurate calculation of the amount of stool donated, which is important in critically ill pa-tients, in whom diarrhoea may cause dehydration. Therefore, it is very important for these patients to keep a fluid balance card describing the amount of fluid intake and excretion. Skin care is another important element of care for patients with C. diffici-le. The skin performs one of the most important functions – a protective function. The possibility of skin damage associated with urinary and/or faecal incontinence (incontinence-associated dermatitis – IAD), in this case caused by C. difficile diarrhoea, requires appropriate care. Patient cleaning products require one-time use, wet towels with a balanced pH and conta-ining dimethicone, having skin protective properties. For the prevention of IAD, it is recommended to use protective and bar-rier creams and lotions. These preparations form a transparent protective layer, which reduces the risk of dermatitis associated with the action of liquid stool [50-52].

EDUCATION OF VISITORS

Another important element in preventing the spread of C. difficile is educating the families and persons visiting a given pa-tient. The very fact of a close person being hospitalised in an intensive care unit is very stressful, so it is worth explaining the rules of conduct to the family in a simple and approachable way. Most importantly, hand hygiene – showing the proper tech-nique of hand washing using soap and water, putting on gloves and disposable protective clothing. The family should be shown how and where medical waste is segregated. It should be stressed that visitors should not sit on the bed of the patient, nor should they put their clothes or objects of everyday use (bags, phones, etc.) on the patient’s linen or on the floor. It is not advisable that the patient be visited by children or older people when infected [53, 54].

SURVEILLANCE


Currently, one of the most important health policy goals is to prevent the increase of microorganism drug resistance by ap-plying relevant antibiotic policy and monitoring and recording infections. The task of a Hospital Infections Control Team (Ze-spół Kontroli Zakażeń Szpitalnych – ZKZSZ) is to manage infection control. Active surveillance includes proper healthcare-associated surveillance with infections prevention and control, monitoring procedures, conducting internal training on proper hand hygiene and patient isolation, as well as controlling use of antibiotics [45, 49, 55, 56].
In intensive care units, discontinuation of antibiotics is difficult, if not impossible, due to the presence of various infections in one patient at the same time. In addition, studies found that about 10-30% of hospitalised patients, as well as a significant proportion of medical personnel, had asymptomatic C. difficile [3, 57], which may contribute to the spread of infection in the hospital [58, 59]. All patients hospitalised in the ICUs with symptoms of: “acute abdomen” for no known reason, diarrhoea with increased leukocytosis, or after antibiotic therapy or after treatment with proton pump inhibitors, should be screened for infection [45].
It is also very important to control the implementation of guidelines and recommendations for treatment and procedures. It is equally important to conduct continuous internal training, both among young, inexperienced nursing staff who still have insufficient knowledge and are prone to make mistakes, as well as among senior nurses who should continuously update their knowledge [60].

CONCLUSIONS


Due to an increase in CDI incidence caused by CDI in ICUs, it is very important to quickly diagnose patients and imple-ment appropriate treatment as well as proper monitoring and registration of infections.
Nurses play a key role in recognising the symptoms of infection and preventing the spread of C. difficile. Following pro-cedures, meticulous hand hygiene, compliance with patient isolation protocols, and proper education of staff and visitors are the foundations for effective prevention of C. difficile transmission.

Disclosure


The authors declare no conflict of interest.

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