Antimicrobial prophylaxis in adult cardiac surgery in the United Kingdom and Republic of Ireland

Patterns of fluoroquinolone utilization and resistance in a tertiary care hospital: a retrospective cross-sectional analysis study from a developing country

BACKGROUND

Fluoroquinolones are the most commonly prescribed antibiotics. Because of their known tendency to drive antimicrobial resistance, their prescribing patterns need to be more restricted. This study aimed to describe the clinical practice of fluoroquinolone prescription, dose adjustments for renal impairment patients and bacterial resistance profiles, eventually providing evidence-based recommendations to optimize antibiotic prescribing practices in the local population.

METHODS

This retrospective, cross-sectional study was conducted at An-Najah National University Hospital in Palestine. The data were collected from admitted patients who were given ciprofloxacin or levofloxacin from July 2021 to June 2023. Data from 692 inpatients across various hospital departments were examined (409 for levofloxacin and 283 for ciprofloxacin). Statistical analysis was performed via IBM SPSS version 23.0 to summarize the demographic, clinical, and epidemiological data.

RESULTS

The sociodemographic profile revealed diverse age distributions, with 25.4% and 39% older than 50 years for ciprofloxacin and levofloxacin, respectively. Ciprofloxacin was predominantly used in the oncology department (28.2%), with surgical prophylaxis (22.6%) and febrile or afebrile neutropenia (21.1%) being the most common indications. Levofloxacin was predominantly used in the medical ward (45.7%), mainly for lower respiratory tract infection (58.8%) and prophylaxis for bone marrow transplantation (16.5%). Enterococcus and methicillin-resistant Staphylococcus aureus were the most commonly isolated pathogens, with 62.5% of the isolates demonstrating resistance to ciprofloxacin. Moreover, extended-spectrum beta-lactamase-producing Enterobacterales were the most common pathogen isolated, with 33.3% being resistant to levofloxacin. Statistical analysis revealed a significant association between the choice of antibiotic and the approach to therapy. Levofloxacin was significantly more likely than ciprofloxacin to be used as empiric therapy (p < 0.001), whereas ciprofloxacin was more likely to be used as targeted therapy (p < 0.001).

CONCLUSIONS

This study investigated prescribing practices and resistance to levofloxacin and ciprofloxacin in a large hospital in a developing country. According to the bacterial resistance profiles, we conclude that there is a need for hospital departments to exercise greater restraint on the use of these antibiotics. To this end, further studies addressing the clinical efficacy of fluoroquinolones against the current treatment guidelines to evaluate their appropriateness should be carried out.

Impact of Antibiotic Prophylaxis on Surgical Site Infections in Cardiac Surgery

(1) Background: Cephalosporins (CA) are the first-line antibiotic prophylaxis recommended to prevent surgical site infection (SSI) after cardiac surgery. The combination of vancomycin/gentamicin (VGA) might represent a good alternative, but few studies have evaluated its efficacy in SSI prevention. (2) Methods: A single-centre retrospective study was conducted over a 13-year period in all consecutive adult patients undergoing elective cardiac surgery. Patients were stratified according to the type of antibiotic prophylaxis. CA served as the first-line prophylaxis, and VGA was used as the second-line prophylaxis. The primary endpoint was SSI occurrence at 90 days, which was defined as the need for reoperation due to SSI. (3) Results: In total, 14,960 adult patients treated consecutively from 2006 to 2019 were included in this study, of whom 1774 (12%) received VGA and 540 (3.7%) developed SSI. VGA patients had higher severity with increased 90-day mortality. Nevertheless, the frequency of SSI was similar between CA and VGA patients. However, the microbiological aetiologies were different, with more Gram-negative bacteria noted in the VGA group. (4) Conclusions: VGA seems to be as effective as CA in preventing SSI.

Surgical Site Infection in Cardiac Surgery

Surgical site infections (SSIs) are one of the most significant complications in surgical patients and are strongly associated with poorer prognosis. Due to their aggressive character, cardiac surgical procedures carry a particular high risk of postoperative infection, with infection incidence rates ranging from a reported 3.5% and 26.8% in cardiac surgery patients. Given the specific nature of cardiac surgical procedures, sternal wound and graft harvesting site infections are the most common SSIs. Undoubtedly, DSWIs, including mediastinitis, in cardiac surgery patients remain a significant clinical problem as they are associated with increased hospital stay, substantial medical costs and high mortality, ranging from 3% to 20%. In SSI prevention, it is important to implement procedures reducing preoperative risk factors, such as: obesity, hypoalbuminemia, abnormal glucose levels, smoking and S. aureus carriage. For decolonisation of S. aureus carriers prior to cardiac surgery, it is recommended to administer nasal mupirocin, together with baths using chlorhexidine-based agents. Perioperative management also involves antibiotic prophylaxis, surgical site preparation, topical antibiotic administration and the maintenance of normal glucose levels. SSI treatment involves surgical intervention, NPWT application and antibiotic therapy.