Standard Antimicrobial Therapy Research Articles

Effects of Adding P2Y12 Inhibitor to Anti-staphylococcal Therapy on Bacterial Clearance in Patients With Staphylococcus aureus Bacteremia.

Staphylococcus aureus(S. aureus) bloodstream infection (SAB) remains a major clinical challenge despite appropriate antimicrobial therapy. Recent studies have suggested the potential benefits of P2Y12 inhibitors in SAB treatment, but controversy persists regarding their optimal use. Moreover, the effects of P2Y12 inhibitors in Japanese patients remain unclear. This study aimed to evaluate the effects of using P2Y12 inhibitors before admission on outcomes in Japanese patients with SAB. This retrospective study involved Japanese patients aged 18 years and older with S. aureus-positive blood cultures at Aichi Medical University Hospital in Japan from March 2015 to April 2023. The primary outcome was the rate of persistent bacteremia among patients with follow-up blood cultures within seven days. The secondary outcomes were 30-day and in-hospital mortality rates and bleeding events during hospitalization. During the study period, 238 patients with SAB (19 P2Y12 inhibitor users and 219 non-users) were enrolled. The median age was 77 years, and 38.7% of the patients were female individuals. The overall rate of methicillin-resistant S. aureus as a percentage of S. aureus was 37.9%, with no significant difference between the groups. The rate of persistent bacteremia was significantly lower in P2Y12 inhibitor users than in non-users (0% vs. 20.6%, p=0.03). The Kaplan-Meier survival curve for the 30-day and in-hospital mortality rates showed no significant difference between the groups (log-rank test, p=0.25 and p=0.20, respectively). No bleeding events occurred in either group. This retrospective study suggests that Japanese patients with SAB using P2Y12 inhibitors prior to admission as adjunctive therapy have a higher rate of microbiological clearance than non-users. However, further prospective studies are needed to determine the benefits of adding P2Y12 inhibitors to standard antimicrobial therapy for SAB.

Oral syphilis - the great imitator: a series of six cases

Syphilis is an infectious disease which can present with multitudinous mucocutaneous manifestations. Often referred to as the ‘great mimicker', syphilis can present with non-specific symptoms and has a tropism for various organ systems. The oral cavity has been identified as a site commonly affected in the early stages of syphilis infection. Identification of the diverse presentations seen across the different stages of syphilis infection can assist in early diagnosis and treatment for this cohort of patients. Despite accurate diagnostic tools and the susceptibility of the infection to standard antimicrobial therapy, syphilis infections continue to rise worldwide.We present the clinical features and management of six cases of oral syphilis who presented to our unit. One case presented in 2008, but the other five cases presented between 2016 and 2023, reflecting the increasing incidence of syphilis infection. Five cases presented in the secondary stage of the infection while one presented with a primary infection in the form of a single chancre.The documented cases demonstrate the non-specific and variable clinical features of oral syphilis and highlight the importance of awareness in the dental profession of these manifestations. Dentists have an important role to play in recognising the disease and arranging appropriate testing for early intervention. This will not only reduce the incidence of the devastating consequences of tertiary infections but will also result in reduced spread of the disease.

Human microbiome: Impact of newly approved treatments on C. difficile infection.

In an effort to expedite the publication of articles, AJHP is posting manuscripts online as soon as possible after acceptance. Accepted manuscripts have been peer-reviewed and copyedited, but are posted online before technical formatting and author proofing. These manuscripts are not the final version of record and will be replaced with the final article (formatted per AJHP style and proofed by the authors) at a later time. The primary purposes of this review are to provide a brief overview of the microbiome, discuss the most relevant outcome data and key characteristics of each live microbiome agent, and pose questions for consideration going forward as these agents are integrated into clinical practice. The management of Clostridiodes difficile infection (CDI) remains a difficult clinical conundrum, with recurrent CDI occurring in 15% to 35% of patients and causing significant morbidity and decreased quality of life. For patients with frequent CDI recurrences, fecal microbiota transplantation (FMT) has been demonstrated to have significant benefit but also significant risks, and FMT is not approved by the US Food and Drug Administration (FDA) for that indication. FDA has established a new therapeutic class for agents known as live biotherapeutic products (LBPs) that offer significant advantages over FMT, including standardized screening, testing, and manufacturing as well as known quantities of organisms contained within. Two new live microbiome products within this class were recently approved by FDA for prevention of CDI recurrences in adult patients following treatment for recurrent CDI with standard antimicrobial therapy. Both agents had demonstrated efficacy in registry trials in preventing CDI recurrence but differ significantly in a number of characteristics, such as route of administration. Cost as well as logistics are current obstacles to use of these therapies. Live microbiome therapy is a promising solution for patients with recurrent CDI. Future studies should provide further evidence within yet-to-be-evaluated populations not included in registry studies. This along with real-world evidence will inform future use and clinical guideline placement.

Bioengineering Approaches and Novel Biomaterials to Enhance Sternal Wound Healing after Cardiac Surgery: A Crosstalk between Innovation and Surgical Practice.

Median sternotomy and steel wires for sternal closure are the standard approach for cardiac surgery. An incomplete repair associated with chest wall motion, especially in the presence of predisposing factors, can lead to life-threatening deep sternal wound infection, also known as mediastinitis, in 2-5% of cases. Despite current antibiotic and surgical treatments, mediastinitis is associated with a 10-40% mortality rate and a significant increase in morbidity and hospital stay. High mortality and difficult treatment appear to be due to bacterial biofilm, a self-produced extracellular polymeric product that incorporates host tissue and is responsible for the failure of immune defenses and standard antimicrobial therapies. Nanostructures are an effective strategy to enhance the healing process, as they establish a favorable environment for the neosynthesis of the extracellular matrix, supporting tissue development. Synthetic polymers have been proven to exhibit suitable biodegradable and mechanical properties, and their biofunctionalization to enhance cell attachment and interaction with the extracellular matrix is being widely investigated. The use of antibiotic treatments suspended in poly-D,L-lactide and polyethylene oxide and electrospun into nanofibers, or in sponges, has been shown to inhibit bacterial biofilm production. Additionally, growth factors can be incorporated into 3D bioresorbable scaffolds with the aim of constituting a structural and biological framework to organize and expedite the healing process. Therefore, these combined approaches may change the treatment of mediastinitis in the near future.

Subdural Empyema as a Rare Complication Caused by Neisseria meningitidis B

Subdural empyema (SDE) is an intracranial collection of purulent material located between the dura and the arachnoid mater. It is a serious central nervous system infection which can cause neurological sequelae and high mortality. We report one of the rare cases of SDE secondary to Neisseria meningitidis to underline the interest of evoking this diagnosis especially in patients not responding to standard antimicrobial therapy.

Rifampicin in the Treatment of Refractory Diabetic Foot Ulcer and Diabetic Foot Osteomyelitis-an Observational Study.

Refractory diabetic foot ulcer (rDFU) and osteomyelitis (diabetic foot osteomyelitis [DFO]) are a major problem in people with diabetes. Often resulting from multidrug-resistant polymicrobial infection, these may result in amputation or nonhealing ulcers. In this nonrandomized open-label study, we looked at the outcome of treatment with rifampicin in patients with nonhealing diabetic foot ulcers. Patients with DFUs (n = 67, n = 55 with DFO) unresponsive to conventional antimicrobial therapy for >3 months (rDFU) were taken as the study group. All patients received rifampicin for a minimum of 3 months (maximum 6 months if DUFs did not heal after 3 months) in addition to standard antibiotics and compared with similar kind of DFUs (n = 68, n = 55 DFO) who formed the control group, treated with conventional antimicrobial therapy. Patients were followed up for 12 months. Healing of DFU at 6 months and amputation were primary endpoints of the study. In total, 43 patients (64.2%) in the rifampicin group healed at 3 months and another 4 patients healed when rifampicin was continued for 6 months (n = 47, 70.1%). In the control group, 11 patients healed at 3 months (16.2%) and 25 patients healed at 6 months (36.8%). In total, 14 patients (20.9%) in the study group and 29 patients (42.6%) in the control group had to undergo minor amputation. Comparison between the rate of healing at 3 and 6 months and minor amputation between the study group and control group showed statistically significant results (P ≤ .00001, <.00001, and .008, respectively). In total, 6 and 8 patients despite healing of the primary ulcer had a subsequent recurrence of ulcer in the rifampicin and control group, respectively. Rifampicin used in conjunction with other standard poly-microbial therapy in refractory complex diabetic foot ulcer unresponsive to standard antimicrobial therapy, can significantly improve wound healing as well as decrease the need for amputation in addition to standard of care.

Dalbavancin as an alternative to traditional outpatient parenteral antimicrobial therapy for deep gram-positive infections - an observational, retrospective review.

Treatment of invasive gram-positive infections in complex patient populations is challenging. Dalbavancin, approved for skin and soft tissue infections, offers advantages in this setting due to its long half-life and infrequent dosing. However, less is known about the outcomes of off-label dalbavancin for deeper infections. The objective of this study is to examine the feasibility and outcomes of patients with complex gram-positive infections treated with dalbavancin as an alternative to standard outpatient parenteral antimicrobial therapy (OPAT). We conducted a multicenter, retrospective review of adult patients managed within an OPAT program with intravenous dalbavancin for off-label indications. Adult patients were included if they had treatment details and follow-up documented between January 2020 and June 2023. Details of dalbavancin use including indications for prescription were captured. Outcomes of interest included 90-day infection recurrence, prosthesis retention rates, 90-day mortality, and adverse medication events. In all, 61 patients received dalbavancin, mostly as sequential therapy. Twenty-three percent received dalbavancin strictly in the outpatient setting. Dalbavancin was used primarily for hardware (fracture, spine, or joint), native bone or joint, and complicated soft tissue infections. The predominant pathogen was Staphylococcus aureus (61%). Dalbavancin was frequently prescribed as a two-dose 1500 mg regimen (49%) due to persistent infection (23%), difficult line access (30%), difficulty achieving therapeutic vancomycin levels (18%), or substance abuse history (18%). Overall, six patients (10%) had infection recurrence and no patients died during the follow-up period. Three of eight patients with hardware retention had infection recurrence. Adverse effects were minimal and mostly self-limiting. Dalbavancin is an efficacious and safe alternative to standard OPAT, especially in those with barriers to traditional long-term intravenous antibiotics. Improved outcomes may be achieved with hardware removal. Dalbavancin may facilitate early discharge or prevent hospitalizations. Comparative studies of standard OPAT regimens versus dalbavancin are needed.

Short-duration selective decontamination of the digestive tract infection control does not contribute to increased antimicrobial resistance burden in a pilot cluster randomised trial (the ARCTIC Study)

ObjectiveSelective decontamination of the digestive tract (SDD) is a well-studied but hotly contested medical intervention of enhanced infection control. Here, we aim to characterise the changes to the microbiome and...

A growing battlefield in the war against biofilm-induced antimicrobial resistance: insights from reviews on antibiotic resistance.

Biofilms are a common survival strategy employed by bacteria in healthcare settings, which enhances their resistance to antimicrobial and biocidal agents making infections difficult to treat. Mechanisms of biofilm-induced antimicrobial resistance involve reduced penetration of antimicrobial agents, increased expression of efflux pumps, altered microbial physiology, and genetic changes in the bacterial population. Factors contributing to the formation of biofilms include nutrient availability, temperature, pH, surface properties, and microbial interactions. Biofilm-associated infections can have serious consequences for patient outcomes, and standard antimicrobial therapies are often ineffective against biofilm-associated bacteria, making diagnosis and treatment challenging. Novel strategies, including antibiotics combination therapies (such as daptomycin and vancomycin, colistin and azithromycin), biofilm-targeted agents (such as small molecules (LP3134, LP3145, LP4010, LP1062) target c-di-GMP), and immunomodulatory therapies (such as the anti-PcrV IgY antibodies which target Type IIIsecretion system), are being developed to combat biofilm-induced antimicrobial resistance. A multifaceted approach to diagnosis, treatment, and prevention is necessary to address this emerging problem in healthcare settings.

Oral minocycline as systemic therapy for uncomplicated venous access device-related bloodstream infection with coagulase-negative staphylococci after allogeneic hematopoietic cell transplantation

BackgroundVenous access device-related bloodstream infection (VAD-BSI) with coagulase-negative staphylococci (CoNS) is a common complication after allogeneic hematopoietic cell transplantation (alloHCT). Standard systemic antimicrobial therapy for uncomplicated VAD-BSI with methicillin-resistant CoNS consists of intravenous (IV) vancomycin (vanco). This requires hospitalization, needs new competent venous access, exposes patients to potential toxicity (mainly renal) and increases the risk of commensal flora dysbiosis with selection of vanco-resistant enterococci. Combined with VAD management (removal or antibiotic locks), oral minocycline (mino) has been evaluated as an alternative systemic therapy for the treatment of uncomplicated VAD-BSIs with CoNS at our center, primarily when the reference treatment with IV vanco was not possible (renal failure or allergy) or when hospitalization was refused by patients. Here, we retrospectively report our single center experience with this mino-based approach. Patients and methodsFrom January 2012 to December 2020, 24 uncomplicated VAD-BSIs with CoNS in 23 alloHCT patients were treated with oral mino as systemic antibiotic therapy in combination with VAD management. VAD were implantable ports (n = 17), tunneled catheter (n = 1) or PIC-lines (n = 6). Staphylococci were S. epidermidis (n = 21) or S. haemolyticus (n = 3). Mino was administered with a loading dose of 200 mg followed by 100 mg BID for 7–14 days. For 8 VAD-BSIs, patients were initially treated with IV vanco for the first 1–3 days followed by oral mino, while 16 VAD-BSIs were treated with oral mino as the sole antimicrobial agent for systemic therapy. VAD management consisted of catheter removal (for tunneled catheters and PIC-lines, n = 7) or antibiotic locks with vanco (n = 15) or gentamicin (n = 2) administered at least 3 times a week for 14 days (for ports). ResultsOverall, clearance of bacteremia (as assessed by negativity for the same CoNS of surveillance peripheral blood cultures drawn between day+ 3 and +30 after initiation of systemic therapy) was achieved in all but 1 patient (with port) who had persistent bacteremia at day +9. No complication such as suppurative thrombophlebitis, endocarditis, distant foci of infection or BSI-related death was observed in any patient during the 3-month period after initiation of treatment. Regarding the 17 port-BSI cases for which VAD conservative strategy was attempted, failure of 3-month VAD preservation was documented in 7/17 cases and 3-month recurrence of VAD-BSI was observed in 3/17 cases (with 1 patient with cellulitis). Treatment with mino was well tolerated except for a mild skin rash in one patient. ConclusionFurther prospective studies are needed to evaluate efficacy and safety of this approach.

Antibiotic Resistance: Challenges and Strategies in Combating Infections.

From a broader perspective, antibiotic or antimicrobial resistance is still evolving and spreading internationally. Infectious diseases have become more complex and often impossible to cure, increasing morbidity and mortality. Despite the failure of conventional, standard antimicrobial therapy, no new class of antibiotics has been developed in the last 20 years, which results in various cutting-edge and other tactics that can be used to encounter these disease-causing microorganisms with antibiotic resistance. In the continued fight against bacterial infections, there is an urgent requirement for new antibiotics and other antimicrobials. Antibiotic resistance is inevitable, and pharmaceutical companies consistently show little interest in funding novel antibiotic research. Some methods are being used as a possible replacement for conventional antibiotics. Combination therapy, methods that target the proteins or enzymes that cause antimicrobial resistance and bacterial resistance, systems for delivery of the drug, physicochemical approaches, and informal ways, such as the CRISPR-Cas system, are some of these approaches. These various approaches influence how multi-drug-resistant organisms are handled in human clinical settings.

Risk Factors and Characteristics of Recalcitrant Osteomyelitis Following Initial Surgical and Antibiotic Treatment.

To evaluate the injury, patient, and microbiological characteristics that place patients at risk for recalcitrant fracture related infection and osteomyelitis despite appropriate initial treatment. Retrospective Chart Review. Three level I trauma centers. Two hundred and fifty-seven patients undergoing surgical debridement and antibiotic therapy for osteomyelitis from 2003 to 2019. Patients were categorized as having undergone serial bone debridement if they had two separate procedures a minimum of six weeks apart with a full course of appropriate antibiotics in between. Patient records were reviewed for age, injury location, body mass index (BMI), smoking status, comorbidities, and culture results including the presence of multidrug resistant organisms (MDRO) and culture-negative osteomyelitis. A total of 257 patients were identified; 49% (n=125) had a successful single course of treatment, and 51% (n=132) required repeat debridement for recalcitrant osteomyelitis. At the index treatment for osteomyelitis, the most common organisms in both groups were Methicillin-resistant (MRSA) and Methicillin-sensitive Staphylococcus aureus (MSSA). There was no significant difference in incidence of polymicrobial infection between the two groups (25% vs 20%, p=0.49). The most common organisms cultured at the time of repeat saucerization remained MRSA and MSSA, however, the same organism was cultured from both the index and repeat procedure in only 28% (n=37) of cases. Diabetic patients, IVDU, delay to diagnosis, and open fractures of the lower leg are independent risk factors for failure of initial treatment of post-traumatic osteomyelitis. Successful eradication of fracture related infection and post-traumatic osteomyelitis is difficult and fails 51% of the time despite standard surgical and antimicrobial therapy. While MRSA and MSSA remain the most common organisms cultured, patients who fail initial treatment for osteomyelitis often do not culture the same organisms as those obtained at the index procedure.

Repeated sessions of PACK-CXL WA for the treatment of resistant bacterial keratitis: a retrospective study

ObjectiveThe aim of this work is to evaluate the safety and efficacy of repeated sessions of photo-activated chromophore for keratitis-cross linking (PACK-CXL) window absorption (WA) for the treatment of resistant bacterial keratitis (BK).Patients and methodsThis is a retrospective clinical cohort study. Thirty eyes with clinically suspected and lab-confirmed bacterial keratitis, resistant to appropriate antibiotic therapy- which was modified by sensitivity reports- for 2 weeks with failure of epithelialization for 4 weeks after the standard anti-microbial therapy (SAT) together with one setting of PACK-CXL WA were included. If after the first session of PACK-CXL, there is a start of improvement in the form of reduction of the size of corneal ulcer and stromal infiltrates together with the start of epithelialization on clinical examination and AS-OCT, another session of PACK-CXL WA was performed after one week, and so on, till the complete healing and resolution of bacterial keratitis and confirmation by negative bacterial culture. Identification of the micro-organisms was done by lab study before and after treatment. Corneal healing was evaluated by corneal examination and anterior segment OCT (AS-OCT).ResultsThirty eyes of 30 patients were recruited in this study. They were 16 males and 14 females, their mean age was 44.3 ± 5.38 years. The mean ulcer size was 3.96 ± 1.87 (mm3), while the mean size of stromal infiltrates was 4.52 ± 2.24 (mm3). PACK-CXL WA treatment was performed an average of 2.87 times for the 30 eyes. Complete healing and resolution (Successful treatment) was observed in 27 eyes (90%) of cases and failure of epithelialization was observed only in 3 eyes (10%). Complete corneal healing was reported in the second month postoperatively in 90% of eyes.Conclusion and recommendationPACK-CXL WA may be a promising, non-invasive treatment option for resistant bacterial keratitis. It may have a synergistic effect with standard antimicrobial treatment (SAT). Also, it can overcome the antibiotics resistance that has become rapidly spreading worldwide. Repeated sessions of PACK-CXL WA may be more effective for the treatment of resistant bacterial keratitis till complete epithelialization and resolution of BK than a single session with few complications. However, further prospective and comparative studies to support the results are needed.

Does granulocyte transfusion help pediatric cancer patients with sepsis?

Sepsis-related mortality continues to be a major concern while treating pediatric cancer patients, more so with the rise in the incidence of multidrug-resistant organisms (MDRO). In this retrospective study conducted between January 2021 and December 2022 at a tertiary cancer center in India, granulocyte transfusion was offered in addition to standard antimicrobial therapy to 64 children with hematolymphoid malignancy who developed 75 episodes of severe sepsis following intensive chemotherapy. Forty-four (83%) of 53 blood culture proven sepsis was caused by MDROs. Thirty-seven (70%) patients with blood culture proven sepsis cleared the organism after granulocyte transfusion. Thirty-day mortality was 25% for the entire study cohort and 32% for patients with MDRO sepsis.

Safety and efficacy of nightly nitrofurantoin as prophylaxis in dogs with recurrent urinary tract infections: 13 cases (2015-2021).

To report the protocol, efficacy and adverse events in dogs receiving nightly nitrofurantoin therapy as antimicrobial prophylaxis for recurrent urinary tract infections. Retrospective case series of dogs prescribed nitrofurantoin as prophylaxis for recurrent urinary tract infections. Data on urological history, diagnostic investigation, protocol, adverse events and efficacy (through serial urine cultures) were extracted from medical records. Thirteen dogs were included. Before therapy, dogs had a median of 3 (range 3 to 7) positive urine cultures in the past year. In all but one dog, standard antimicrobial therapy was given before starting the nightly nitrofurantoin. The nightly nitrofurantoin was then prescribed at a median dose of 4.1mg/kg orally every 24 hours for a median of 166 days (range 44 to 1740). The median infection-free interval on therapy was 268 days (95% confidence interval: 165 to undefined). Eight dogs had no positive urine cultures while on therapy. Of these, five (three which discontinued and two which remained on nitrofurantoin) had no return of clinical signs or bacteriuria at time of last follow-up evaluation or death, and three had suspected or confirmed bacteriuria 10 to 70 days after discontinuation. Five dogs developed bacteriuria on therapy, four of which were nitrofurantoin-resistant Proteus spp. Most other adverse events were minor; none were considered likely caused by the drug on causality assessment. Based on this small study group, nightly nitrofurantoin appears well tolerated and might be efficacious prophylaxis for recurrent urinary tract infections in dogs. Infection with nitrofurantoin-resistant Proteus spp. was a common reason for treatment failure.

THE DYANAMICS OF LIGHT- THE PHOTODYANAMIC THERAPY. ARE WE FORGETTING IT!

Plaque biolms is the primary etiology for periodontitis. Mechanical debridement procedures to treat periodontitis still remain the gold standard but adjunctive antimicrobial therapy is also required in certain cases. However the use of antibiotics has their own disadvantages of creating resistant bacterial forms as well as systemic side effects. Photodynamic therapy (PDT) is a novel non-invasive therapeutic approach which overcomes these problems. Photodynamic therapy (PDT) or photochemotherapy has increased pathogen specicity as well as site specicity and hence no systemic effects. PDTinvolves the use of a photosensitiser which on exposure to light of specic wavelength, gets activated, to form toxic oxygen species which further cause a localised photodamage and cell death. As PDT is with no localised as well as systemic adverse effects, its application in periodontal disease treatment continues to evolve into a mature clinical treatment modality.

B DISCERNING: ROLE OF RITUXIMAB IN INTERFERON GAMMA AUTOANTIBODY DISEASE

<h3>Introduction</h3> Adult-onset immunodeficiency with anti-interferon gamma autoantibodies can lead to disseminated infections by opportunistic pathogens. This case describes interferon gamma autoantibodies responsible for treatment resistant disseminated mycobacterium avium (MAC) infection. <h3>Case Description</h3> A 52 year-old man originally from Laos was seen as an outpatient consult for concern for immunodeficiency. He originally presented with weight loss and fatigue, and CT chest showed a spiculated mass with lymphadenopathy. Lymph node biopsy demonstrated MAC, and PET scan suggested multi-organ disease. He failed to improve on standard antimicrobial therapy, requiring prolonged hospitalization. Family history was significant for parental consanguinity and a sister with severe MAC infection. Our differential diagnosis included Mendelian susceptibility to mycobacterial disease (MSMD) and acquired interferon-gamma autoantibodies. Genetic testing with the Invitae Primary Immunodeficiency panel was unrevealing, and testing for clinically significant interferon gamma autoantibodies was positive. Due to further clinical deterioration, treatment with rituximab was initiated. His symptoms improved after four weekly infusions with complete depletion of B cells. Despite clinical improvement, he was re-admitted for AKI and hypercalcemia resistant to standard management. His hypercalcemia was ultimately attributed to immune reconstitution inflammatory syndrome (IRIS) due to granulomatous MAC formations. <h3>Discussion</h3> Severe MAC infections are rare and should bring to mind both Mendelian susceptibility to mycobacterial disease and acquired autoantibodies directed against interferon gamma. Rituximab therapy should be considered for patients with auto-antibodies who do not respond to antimicrobial therapy. A potential consequence of such therapy is hypercalcemia secondary to immune reconstitution inflammatory syndrome.

Bearberry in the treatment of acute uncomplicated cystitis (BRUMI): protocol of a multicentre, randomised double-blind clinical trial

BackgroundBearberry (Arctostaphylos uva-ursi) leaf is available as a treatment of uncomplicated cystitis in several European countries. The antimicrobial activity of its extracts and some of its individual constituents has been...

Refractory Peritonitis and Small Bowel Ileus: A Case of Encapsulating Peritoneal Sclerosis Secondary to Mycobacterium abscessus Peritonitis.

IntroductionComplications of peritoneal dialysis (PD) such as exit-site infections and PD peritonitis are common reasons for admission to General Internal Medicine wards. Culprit organisms range from typical skin flora to rarer complicated atypical organisms such as non-tuberculous mycobacteria. Encapsulating peritoneal sclerosis (EPS) is a rarer complication of PD characterized by peritoneal inflammation, ileus and fibrosis with high morbidity, few management options, and poor prognosis.Case DescriptionWe report the case of a patient with a history of end-stage renal disease on peritoneal dialysis who presented with undifferentiated peritonitis and ileus refractory to standard antimicrobial therapy. Subsequent ascitic cultures were positive for Mycobacterium abscessus, and CT imaging was consistent with EPS. To date, EPS secondary to M. abscessus peritonitis has not previously been described.Discussion and ConclusionThis report describes the diagnostic process and treatment offered to this patient and his treatment outcomes over 8 months. It highlights the importance of prompt identification of patients at risk, timely eradication of high-risk pathogens, and transition to haemodialysis to limit morbidity and improve patient prognosis.LEARNING POINTSEncapsulating peritoneal sclerosis secondary to Mycobacterium abscessus peritonitis has not been described to date. M. abscessus and other non-tuberculous mycobacterial organisms should be suspected in peritoneal dialysis patients who present with refractory peritonitis and ileus.Encapsulating peritoneal sclerosis is an inflammatory phenomenon characterized by peritoneal inflammation, fibrosis and bowel ileus in the setting of peritoneal dialysis or recurrent infectious insults with high-risk organisms. Diagnosis depends on characteristic imaging coupled with compatible clinical symptoms.Treatment involves transition to haemodialysis, infection eradication, immunosuppression and anti-hormonal treatment (e.g., tamoxifen). Despite these options, prognosis remains very poor.

Mycoplasma hominis bloodstream infection and persistent pneumonia in a neurosurgery patient: a case report

BackgroundMycoplasma hominis is typically associated with a urogenital tract infection, while its association with bacteremia and pneumonia is rare and therefore easily overlooked. Here we report a M. hominis bloodstream infection and pneumonia in a surgical patient.Case presentationA 56-year-old male with symptoms of pneumonia underwent microsurgery and decompressive craniectomy after a left basal ganglia hemorrhage. The patient recovered well from surgery, but pulmonary symptoms progressively worsened, with antimicrobial therapies seemingly ineffective. Culturing of bilateral blood samples resulted in pin-point-sized colonies on blood agar plates, which were subsequently identified as M. hominis by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Furthermore, sequencing of bronchoalveolar lavage samples also identified M. hominis as the main pathogen responsible for the pulmonary symptoms. The M. hominis strain was ciprofloxacin resistant, but susceptible to doxycycline and moxifloxacin. Doxycycline and moxifloxacin were subsequently used in a successful combination therapy that finally alleviated the patient’s fever and resulted in absorption of pleural effusion. At 1-month follow-up, following complaints of dysuria, a prostate abscess containing M. hominis was detected as the likely primary source of infection. The abscess was successfully drained and treated with doxycycline.ConclusionsMycoplasma hominis should be considered as a source of bloodstream infections and pneumonia, particularly when the response to standard antimicrobial therapy is limited. In this case, effective antimicrobial therapy was only commenced after identification of M. hominis and antimicrobial susceptibility testing.