- Open Access
Rescue fecal microbiota transplantation for antibiotic-associated diarrhea in critically ill patients
Critical Care volume 23, Article number: 324 (2019)
Antibiotic-associated diarrhea (AAD) is a risk factor for exacerbating the outcome of critically ill patients. Dysbiosis induced by the exposure to antibiotics reveals the potential therapeutic role of fecal microbiota transplantation (FMT) in these patients. Herein, we aimed to evaluate the safety and potential benefit of rescue FMT for AAD in critically ill patients.
A series of critically ill patients with AAD received rescue FMT from Chinese fmtBank, from September 2015 to February 2019. Adverse events (AEs) and rescue FMT success which focused on the improvement of abdominal symptoms and post-ICU survival rate during a minimum of 12 weeks follow-up were assessed.
Twenty critically ill patients with AAD underwent rescue FMT, and 18 of them were included for analysis. The mean of Acute Physiology and Chronic Health Evaluation (APACHE) II scores at intensive care unit (ICU) admission was 21.7 ± 8.3 (range 11–37). Thirteen patients received FMT through nasojejunal tube, four through gastroscopy, and one through enema. Patients were treated with four (4.2 ± 2.1, range 2–9) types of antibiotics before and during the onset of AAD. 38.9% (7/18) of patients had FMT-related AEs during follow-up, including increased diarrhea frequency, abdominal pain, increased serum amylase, and fever. Eight deaths unrelated to FMT occurred during follow-up. One hundred percent (2/2) of abdominal pain, 86.7% (13/15) of diarrhea, 69.2% (9/13) of abdominal distention, and 50% (1/2) of hematochezia were improved after FMT. 44.4% (8/18) of patients recovered from abdominal symptoms without recurrence and survived for a minimum of 12 weeks after being discharged from ICU.
In this case series studying the use of FMT in critically ill patients with AAD, good clinical outcomes without infectious complications were observed. These findings could potentially encourage researchers to set up new clinical trials that will provide more insight into the potential benefit and safety of the procedure in the ICU.
ClinicalTrials.gov, Number NCT03895593. Registered 29 March 2019 (retrospectively registered).
Antibiotic-associated diarrhea (AAD) is defined as otherwise unexplained diarrhea that occurs in association with disrupted gut microbiota caused by administration of antibiotics . AAD occurs in about 5–35% of patients treated with antibiotics [1, 2] and more frequently in critically ill patients . The large volume of watery stools and loss of electrolyte caused by AAD may aggravate the condition of a critically ill patient, leading to higher morbidity, longer hospitalization time, higher medical costs, and worse outcomes . Besides, failure of conventional treatment for AAD is particularly frequent in critically ill patients due to their comorbidities, which has become a huge challenge for critically ill patients and their physicians. A systematic review and meta-analysis showed that probiotics were associated with a reduction of AAD, which indicated the potential preventive role of probiotics for AAD . However, whether the effect can be found in critically ill patients remains uncertain.
Clostridium difficile infection (CDI) accounts for about one third of AAD cases and for the vast majority of pseudomembranous colitis (PMC) cases . Fecal microbiota transplantation (FMT), which aims to restore the gut microbiota, has emerged as the most effective alternative for the management of recurrent CDI [5,6,7,8,9]. However, very few reports focus on the application of FMT to the treatment of AAD caused by other or unknown pathogens which accounts for about two thirds of AAD cases. Interestingly, recent reports showed that FMT appeared to be an option for multidrug-resistant organism (MDRO) decolonization [10,11,12]. The safety of FMT had been ensured both in CDI and MDRO-colonized patients regardless of combination with immunosuppression or immunodeficiency [13, 14]. Our recent studies also reported the safety of FMT in patients with inflammatory bowel disease (IBD) and some of them were immunocompromised [15, 16]. However, patients in the intensive care unit (ICU) were not included in these studies [15, 16]. Whether FMT can be a safe and effective treatment for AAD in critically ill patients requires further investigation. Given that the safety and value of FMT have been identified in severe and recurrent CDI and other gut microbiota dysbiosis-related diseases [9, 14, 17, 18], we aimed to investigate the safety and potential benefit of rescue FMT in critically ill patients with AAD.
This case series was performed in 16 ICUs of tertiary hospitals in China including 14 general ICUs and two pediatric ICUs. The rescue FMT therapy course was provided by Chinese fmtBank. This is a part of the registered study of long-term safety and efficacy of rescue FMT for refractory intestinal infections (ClinicalTrials.gov, Number NCT03895593).
Rescue FMT from Chinese fmtBank
The non-profit organization named Chinese fmtBank (fmtbank.org) provides rescue FMT service for patients with refractory intestinal infection across the whole nation. The protocol and workflow of fmtBank are shown in Additional file 2: Figure S1 and Additional file 3: Table S2. Due to the lack of CDI detection kits in most hospitals in China, the diagnosis of CDI could not be confirmed for all patients, and the reported incidence of refractory CDI in China is lower than that in reality [19,20,21,22]. Therefore, the indications of FMT from fmtBank in practice include recurrent or refractory CDI, refractory intestinal infections, and AAD. China Microbiota Transplantation System (CMTS) was set up simultaneously to evaluate long-term safety and efficacy of FMT.
Donor screening and management
All patients underwent FMT from unrelated universal donors who were 18–24 years old. Other than the initial eligibility screening, regular safety monitoring including dietary guidance, living environment follow-up, and laboratory examinations were scheduled for these donors. Protocol of donor screening and management has been described in our previous studies [16, 23] and is briefly shown in Additional file 3: Table S1.
Procedure of rescue FMT
Rescue FMT was performed by the cooperated team which consisted of at least two ICU physicians in charge from destination hospitals, two professional FMT clinicians (FZ and BC), two laboratory managers, and one clinical research coordinator from the Second Affiliated Hospital of Nanjing Medical University. The procedure of rescue FMT is shown in Additional file 3: Table S2. Risk factors of serious adverse events (AEs) were evaluated by the rescue team as the exclusion criteria. Excluded patients included those with complete intestinal obstruction, suspected postoperative intestinal leak, and active intestinal fistula within 1 month; without optional FMT delivery way; unable to maintain a suitable position to avoid adverse events such gastric reflux and aspiration; without informed consent from the patient, patient’s family, or legal guardians; and those with other unsuitable conditions for rescue FMT. The rescue team members communicated closely throughout the whole process to ensure the safety of rescue FMT.
Patients and data collection
A database of 28 consecutive critically ill patients with AAD who applied for rescue FMT through their physicians from fmtBank, from September 2015 to February 2019, was reviewed (Fig. 1). Pre-FMT data of patients were collected through the medical records including the demographic characteristics, primary pre-FMT diagnosis from ICU, Acute Physiology and Chronic Health Evaluation (APACHE) II scores, Sequential Organ Failure Assessment (SOFA) score, antibiotic use, probiotic use, abdominal symptoms, and laboratory findings. Part of post-FMT data was collected through the medical records when patients were in the study hospital. Patients were contacted via telephone and asked to finish a questionnaire (Additional file 1) that solicited post-FMT data when they were out of the hospital. A minimum of 12 weeks follow-up after rescue FMT was conducted.
The outcomes and definitions
AEs and rescue FMT success during a minimum of 12 weeks follow-up were assessed. AEs referred to any new onset of symptoms, the exacerbation of previous symptoms, and abnormal laboratory findings with the use of FMT . The occurrence of AEs in the ICU was recorded on a daily basis, while AEs that occurred out of the ICU were recorded via telephone follow-up or hospital visit. The Common Terminology Criteria for Adverse Events (Version 5.0) was applied to describe the intensity and relativity of AEs with FMT. The intensity of AEs was graded as mild (grade 1), moderate (grade 2), severe (grade 3), life threatening (grade 4), and death (grade 5). Relationship between AEs and FMT was based on clinical judgment and all available information. Consideration of temporal association between FMT exposure and onset of the AEs, and whether the manifestations of the AEs were consistent with known actions or theoretical toxicity of FMT were included. Relationship between AEs and FMT was categorized as definitely related, probably related, possibly related, and unrelated according to a description from Kelly et al. about how to guide investigational new drug application for FMT . AEs were reviewed and classified through voting by the rescue team members.
Rescue FMT success was defined as complete resolution of abdominal symptoms without recurrence and post-ICU survival for a minimum of 12 weeks. FMT response was featured to describe the improvement of abdominal symptoms within 1 week after rescue FMT. FMT nonresponse was defined as persistent abdominal symptoms after rescue FMT. Rescue FMT failure was defined as persistent or recurrent abdominal symptoms or continued ICU stay or death within 12 weeks after rescue FMT. FMT response and nonresponse were evaluated by at least two experienced ICU physicians in charge.
Descriptive analysis was performed in this case series. Patient characteristics were evaluated using mean ± standard deviations (SD) for normally distributed continuous variables, median and range for skewed continuous variables, and proportions for categorical variables. Data were analyzed by IBM SPSS 24.0 or GraphPad 7.0. Analyses included paired t test for normally distributed continuous paired data and Wilcoxon matched-pairs signed rank test for skewed continuous paired data. Two tailed p value was calculated with each test. P values < 0.05 were considered significant.
Characteristics of critically ill patients
A total of 20 critically ill patients underwent rescue FMT from fmtBank (Fig. 1). Patients who did not complete the follow-up were excluded from the analysis (n = 2). Eighteen patients (Table 1) (age median 55, range 2–91, two patients < 14, male/female 12/6) were included for analysis. The median time of the onset of primary abdominal symptoms before the rescue FMT was 31.5 days (range 8–120 days). The average APACHE II score at ICU admission was 21.7 ± 8.3 (range 11–37). Three patients were tested with Clostridium difficile toxin or culture, and one patient had a positive culture of Clostridium difficile and the other two were tested toxin negative.
All patients had complicated extra-intestinal infections (Table 1), 66.7% (12/18) of them had more than one extra-intestinal infection site. The most common infection site was respiratory tract (RT), with 16 (88.9%) patients involved. Sixteen (88.9%) patients had a positive culture of MDRO. For the types of organisms, seven (43.8%) patients were infected with Acinetobacter baumannii, six (37.5%) with Pseudomonas aeruginosa, and four (25.0%) with Enterococcus aureus. Eight (44.4%) patients had sepsis at the time of FMT, and five (27.8%) had multiple organ dysfunction syndrome (MODS).
Antibiotic and probiotic use before and after FMT
Patients were treated with a mean of four (4.2 ± 2.1, range 2–9) types of antibiotic before and during the onset of AAD. The types and duration of antibiotic use are shown in Fig. 2. Six (33.3%) patients were medicated with vancomycin for the treatment of AAD before FMT, two (11.1%) with metronidazole, and two (11.1%) with vancomycin and metronidazole. Seventeen (94.4%) patients discontinued the antibiotic use 12–24 h before FMT. Besides, the majority of patients (83.3%) continued antibiotic treatment after FMT. Seven (38.9%) patients reused antibiotics within 24 h after FMT, 12 (66.7%) within one week after FMT. The antibiotic resuming time after FMT is listed in Table 1. Sixteen (88.9%) patients were given probiotics for the prevention or treatment for AAD before and during the AAD onset, and 13 (72.2%) patients took more than one type of probiotics.
Adverse events following rescue FMT
In total, 33 FMTs were performed on 18 critically ill patients (the frequency and delivery way of FMT are listed in Table 1). Among them, seven (7/18, 38.9%) patients had FMT-related AEs during follow-up. And Pt 14 had two FMT-related AEs. The most common FMT-related AEs were increased diarrhea frequency and abdominal pain. All AEs are listed in Table 1. Eight deaths occurred during the follow-up, which were categorized unrelated to FMT (Table 1). The core causes of death are listed in Additional file 3: Table S3. One patient (Pt 10) developed diarrhea exacerbation with increase of diarrhea frequency within 24 h after the first FMT due to the low temperature of fecal microbiota suspension. But the second FMT improved the diarrhea which was reflected on the improvement of stool consistency and decrease of diarrhea frequency. This patient recovered from severe sepsis and PMC and was finally discharged from ICU. She came back to the hospital for a checkup for pneumonia 8 weeks and 16 weeks after FMT. Chest computed tomography indicated the resolution of pneumonia. But she developed herpes zoster and was hospitalized 116 days after the first FMT, which was considered to be unrelated to FMT.
Clinical outcomes following rescue FMT
Clinical outcomes following rescue FMT for AAD in critically ill patients are shown in Table 1. 72.2% (13/18) of patients achieved FMT response within one week after FMT (Fig. 3a). Among 15 patients with primary abdominal symptoms of diarrhea, 86.7% (13/15) of them achieved improvement (Fig. 3b). 69.2% (9/13) of patients achieved improvement of abdominal distention including two patients as primary abdominal symptoms and seven as secondary abdominal symptoms. And 100% (2/2) of patients’ abdominal pain was improved, and 50% (1/2) of hematochezia was alleviated. In addition, the laboratory findings showed that WBC count, CRP, and PCT after FMT were decreased to a certain degree, though a significant difference can only be seen in PCT (p = 0.0005), compared with pre-FMT conditions (Fig. 3c–e).
Rescue FMT success was observed in eight (44.4%) patients, and the median length of follow-up was 50.6 weeks (range 12–191.8 weeks, by May 2019). Reasons for rescue FMT failure are shown in Fig. 1. Among the eight rescue success patients, five patients had bacteremia, including Klebsiella pneumoniae, Escherichia coli, Enterobacter cloacae, Enterococcus faecium, and Acinetobacter baumannii. Pt 1 was discharged from ICU 4 days after FMT and transferred to a recovery room without a re-examination of microbiological culture. Pt 5 was checked for the microbiological culture of blood 1 month after FMT, and the result indicated MDRO decolonization. The MDROs colonizing in Pt 7, 9, and 15 were not cleared before they were discharged from the ICU, and the final post-ICU results were not detected.
This case series focused on the safety and potential benefit of rescue FMT for AAD in critically ill patients. The results showed that 38.9% (7/18) of patients had FMT-related AEs during the minimum of 12 weeks follow-up. No FMT-related death or infective complications occurred. 72.2% (13/18) of patients achieved improvement of abdominal symptoms within one week, and 44.4% (8/18) of patients acquired rescue FMT success.
The potential serious AEs such as infective complications following FMT in critically ill patients are the primary concern of clinicians, which have so far limited the use of FMT [25, 26]. There were a few case reports and case series about the application of FMT in critically ill patients in the ICU [27,28,29,30,31]. Less attention was paid particularly to the incidence of AEs of FMT in critically ill patients [28, 30]. In this series, 38.9% (7/18) of patients had FMT-related AEs, which was higher than that in previous studies of FMT for non-ICU patients [7, 15, 16, 18]. This may be attributed to that the patients in the ICU were more sensitive to the interventional changes. Importantly, the US Food and Drug Administration (FDA) in June 2019 issued a serious FMT-related AE that may be attributed to the improper donor screening. This safety event highlighted the importance of strict criteria for donor screen [32, 33] and assessment on status of recipients including their age, immune fuction, and nutritional status . In addition, the methodology of fecal microbiota preparation might be an important factor affecting safety [33, 34]. Our recent studies based on IBD patients indicated that purification of microbiota from donated stool in a GMP-level lab with an automatic machine contributed the significantly decreased AEs [15, 16, 33, 34].
For the heterogeneity of patients in the ICU, more data were needed to identify which subset of ICU patients would potentially benefit more from FMT with less AEs. Moreover, the procedure of rescue FMT for critically ill patients based on the multidisciplinary cooperation, individualized therapy strategy such as route of administration and antibiotic use, and management for AEs, was the most important part for ensuing safety of FMT. A multidisciplinary team has been set up in fmtBank including gastroenterologists who are professional in FMT, endoscopists, and infectious disease physicians as recommended by Cammarota et al. [26, 32]. The team cooperated with the patients’ physicians to perform FMT and monitor for the short-term (within one month post-FMT) and long-term (over one month post-FMT) AEs  to keep the safety of FMT as far as possible. The majority of FMT-related AEs in the present case series were mild to moderate and < 1 day after the first FMT except one severe AE in Pt 8. This patient’s condition progressed very quickly and developed severe diarrhea with blood and lots of necrotic intestinal mucosa mixed in the stool 17 days after the primary diarrhea onset. Her APACHE II score at the first 24 h of ICU admission was 39 (Additional file 4), which indicated the disease severity and high risk of mortality . Multiple conventional therapies were used before rescue FMT but could not prevent the progression from AAD to PMC. Rescue FMT was used as the last attempt to save life in this patient but things did not work out.
Rescue FMT showed promising benefits for AAD in critically ill patients. 100% (2/2) of abdominal pain, 86.7% (13/15) of diarrhea, 69.2% (9/13) of abdominal distention, and 50% (1/2) of hematochezia can be alleviated by FMT. These results were similar to those of a recent case series which included nine critically ill patients with severe CDI . It indicated that following FMT there was marked improvement in clinical status with resolution of diarrhea and reduction in abdominal distention and pain . Alleviation of these abdominal symptoms may improve life quality of the critically ill patients and provided chances for other treatments. Interestingly, among the patients achieving rescue FMT success, five of them had bacteremia caused by enteric bacteria. One patient (Pt 5) had the clearance of bacteremia of E. coli after FMT with application of antibiotic treatment. Four patients were free of symptoms of bacteremia though there were no negative cultures of blood. Besides, Li et al.  described a 29-year-old woman with bacteremia of Acinetobacter baumannii whose microbiological culture of blood was negative 1 day after FMT without using antibiotics. Singh et al.  reported that three out of 15 (20%) patients carrying extended spectrum beta lactamase (ESBL)-producing Enterobacteriaceae were ESBL-negative at 1, 2, and 4 weeks after the first FMT, while six out of 15 (40%) were negative after the second transplant. But a recent randomized controlled study showed limited benefit of antibiotics followed by FMT for MDRO decolonization . More prospective data are needed. And the timing for discontinuing and resuming antibiotics may be another important question. Continued antibiotic use during FMT and early resuming of antibiotics after FMT may be risk factors for multiple FMTs in this series.
Among the patients who achieved rescue FMT success, 62.5% (5/8) of them reused antibiotics within 1 week after the first FMT, but their diarrhea did not exacerbate or recur. Meanwhile, the complicated infections were alleviated. On the one hand, restoration of gut microbiota through FMT can repair the integrity of intestinal mucosal and prevent bacteria translation to acquire the improvement of diarrhea and reduction of inflammation . On the other hand, gut microbiota has significant interactions on immunity . Combination of conventional treatments and FMT may be more effective than either. Cui et al. described the concept of step-up FMT strategy which included step 1: single FMT; step 2: multiple FMTs; and step 3: FMT followed by steroids, which helped 57.1% of steroid-dependent ulcerative colitis patients maintain steroid dependence . Fischer et al. suggested that additional antibiotic treatment for CDI after FMT, followed by a second FMT, may improve outcomes in patients with severe CDI , which is similar to the concept of step 3 in the step-up FMT strategy [17, 40].
Several studies showed the prevention and treatment value of probiotics for AAD [4, 41,42,43]. It is worth mentioning that 88.9% of patients in this case series were given probiotics to prevent or treat AAD. However, one single type or several types of probiotics seemed to have limited effects in critically ill patients with AAD. Compared with probiotics, FMT comes with risks of pathogen transmission from the donor and an increase of AEs but might be a better method for complete restoration of gut microbiota . Nonetheless, further studies should aim at identifying the precise bacterial strains and specific functions, and two or more bacterial strains’ co-effect named selective microbiota transplantation (SMT) might be the new direction .
The limitation of this series is the small sample size of subjects and lack of control group. It is difficult to select critically ill patients for potential FMT trials because of the heterogeneity, so the bias cannot be avoided for the narrow subset of patients. In short of microbiota sequencing data, we are unable to provide direct evidence for dynamic changes of gut microbiota in critically ill patients before and after FMT. Further insights into the potential of precise bacterial strains and their specific functions as the predictive factors for FMT success and failure might be given by the integrated microbial analysis. The potential effect of FMT on MDRO decolonization also needs to be answered. Elaborately designed studies with a large sample size are needed.
In this case series studying the use of FMT in critically ill patients with AAD, good clinical outcomes without infectious complications were observed. These findings could potentially encourage researchers to set up new clinical trials that will provide more insight into the potential benefit and safety of the procedure in the ICU.
Availability of data and materials
The data used and analyzed in this case series are available from the corresponding author on reasonable request.
Clostridium difficile infection
Fecal microbiota transplantation
Inflammatory bowel disease
Intensive care unit
China Microbiota Transplantation System
Acute Physiology and Chronic Health Evaluation
Multiple organ dysfunction syndrome
Systemic lupus erythematosus
Coronary heart disease
Chronic obstructive pulmonary disease
COPD acute exacerbation
Urinary tract infection
Central nervous system
White blood cell
Food and Drug Administration
Extended spectrum beta lactamase
Selective microbiota transplantation
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The authors would like to thank Jie Zhang at China Microbiota Transplantation System (www.fmtBank.org) and Xiurui Lv for polishing the article. We also thank all participants for their information and cooperation with our follow-up.
This work was supported by publicly donated Intestine Initiative Foundation; Primary Research & Development Plan of Jiangsu Province (BE2018751); Jiangsu Provincial Medical Innovation Team (FZ), National Natural Science Foundation of China (81600417), and China Clinical Research Center for Digestive Diseases (2015BAI13B07).
Ethics approval and consent to participate
This case series was approved by the Institutional Review Board of the Second Affiliated Hospital of Nanjing Medical University. Written informed consent was obtained from patients or pediatric patients’ parents or legal guardians.
Consent for publication
Faming Zhang invented the concept of GenFMTer and related devices. Other authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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Dai, M., Liu, Y., Chen, W. et al. Rescue fecal microbiota transplantation for antibiotic-associated diarrhea in critically ill patients. Crit Care 23, 324 (2019) doi:10.1186/s13054-019-2604-5
- Fecal microbiota transplantation
- Antibiotic-associated diarrhea
- Intensive care unit
- Critical care
- Rescue therapy
- Clostridium difficile
- Multidrug resistance