Ceftriaxone as Home IV for Staph Infections

Abscess, CNS Infection, Coagulase Negative Staphylococcal Infection, Diabetic Foot Infection, Osteomyelitis, Septic Arthritis, Staphylococcal Infections, Vertebral Osteomyelitis

Ceftriaxone, Deep-seated Infections, Staphylococcus aureus, Coagulase-negative Staphylococcus species, MSSA, CoNS

Patients who are admitted to hospital with serious infections, such as those in bone, joints or spine, require a long course of intravenous (IV) antibiotics. After an initial treatment course in hospital or through a dedicated outpatient antibiotic program many patients can complete their treatment course at home. Such infections are often caused by bacteria called Staphylococci, and currently there are three antibiotic options used routinely. A fourth antibiotic, ceftriaxone, is a promising alternative; it is also effective against Staphylococci, and is more convenient, less costly and easier to give at home, however, it has not been studied thoroughly in a prospective manner. This study will compare ceftriaxone to routinely used antibiotics (cloxacillin, cefazolin or daptomycin) to see if ceftriaxone is equally as safe and efficacious in curing deep-seated Staphylococcal infections in patients receiving home IV antibiotics. Patients with deep-seated infections caused by methicillin-susceptible Staphylococcus aureus (MSSA) or coagulase-negative Staphylococcal species will be randomly assigned home IV treatment with ceftriaxone OR one of the three other antibiotics before leaving the hospital. Patients will then receive usual care from an Infectious Disease physician and Home IV team. The study team will assess whether cure has been achieved by the end of the IV treatment, follow-up at 6 months to see if patients remain infection-free, and record any side-effects of treatment. The overall goal is to determine whether ceftriaxone can be considered non-inferior to usual antibiotic treatment in treating Staphylococcal infections in a home IV setting.

The use of ceftriaxone for deep-seated Staphylococcal infections requiring prolonged IV treatment is a practice that has already evolved both locally and globally despite the absence of high-quality clinical data. Retrospective studies that support the use of ceftriaxone for this indication, including those that currently inform Infectious Diseases Society of America (IDSA) guidelines, unanimously agree that prospective, randomized data is urgently needed. Our study is the next natural step in the research process and would greatly add to the body of evidence informing this practice by addressing current knowledge gaps. On a clinical level, demonstrating non-inferiority of ceftriaxone would allow its use in a population of patients currently ineligible for outpatient antibiotic treatment or in cases where broader, more expensive agents are currently employed. This would facilitate more rapid discharge from hospital, lead to substantial cost savings, and have a considerable impact on antimicrobial stewardship. Most importantly, it would improve the quality of life of patients by allowing them to be treated at home in cases when multi-dose home IV administration is a barrier to discharge. This study would address the need to support and harmonize current practice at Island Health, increase the level of evidence in current guidelines and improve patient care both locally and globally. This is a prospective, randomized, controlled, unblinded trial with a pragmatic design. The goal is to assess whether the intervention is non-inferior to standard therapies in achieving the primary outcome. Patients will be drawn from inpatient populations and patients treated through an outpatient antibiotic therapy clinic who are eligible for further IV treatment through a home intravenous therapy program. Patients meeting inclusion criteria as described will be asked to participate and informed consent obtained. Once informed consent is obtained patients will be randomized to receive ceftriaxone or standard therapies (cloxacillin, cefazolin, daptomycin) as determined by the treating infectious diseases physician. Patients will have deep-seated infections such as: * Osteomyelitis * Native Joint Septic Arthritis * Prosthetic Joint Septic Arthritis * Central Nervous System Infection * Deep Tissue Infection * Diabetic Foot Infection Infections will be confirmed to have been caused by methicillin-sensitive Staphylococcus aureus or a coagulase-negative Staphylococcal species through microbiological testing. Susceptibility testing will ensure that the isolate is susceptible to the study drug and at least one of the standard therapies. Once the patient is randomized all other aspects of care will follow usual home IV therapy policies and procedures. Neither the patient nor the clinical team will be blinded to the study drug the patient is receiving. Duration of treatment will be decided by the treating infectious diseases clinician based on infection site and available guidelines. Baseline data will be collected by the study team at the time of randomization. The patient will be followed up in the usual manner by their infectious diseases physician. Data will be collected in a standardized manner at the pre-specified end of antibiotic therapy. Clinical cure (primary outcome) will be determined based on this data. Adverse event rates will be collected throughout the study period. At six months post-randomization the study team will assess for any markers of treatment failure (see secondary outcomes). Plan for statistical analysis is pre-specified in the protocol and will be completed with the assistance of biostatistics staff at the University of Victoria. Specific information on the protection of patient confidentiality and data integrity is outlined in the study protocol. Ethics approval has been granted by the Clinical Research Ethics Board at Vancouver Island Health Authority.

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